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From ol...@apache.org
Subject svn commit: r1442295 [33/38] - in /incubator/helix/site-content: ./ apidocs/assets/ apidocs/reference/ apidocs/reference/org/apache/helix/ apidocs/reference/org/apache/helix/manager/zk/ helix-admin-webapp/ helix-core/ involved/ mockservice/ recipes/ re...
Date Mon, 04 Feb 2013 18:40:12 GMT
Modified: incubator/helix/site-content/xref/org/apache/helix/controller/GenericHelixController.html
URL: http://svn.apache.org/viewvc/incubator/helix/site-content/xref/org/apache/helix/controller/GenericHelixController.html?rev=1442295&r1=1442294&r2=1442295&view=diff
==============================================================================
--- incubator/helix/site-content/xref/org/apache/helix/controller/GenericHelixController.html (original)
+++ incubator/helix/site-content/xref/org/apache/helix/controller/GenericHelixController.html Mon Feb  4 18:40:07 2013
@@ -31,600 +31,609 @@
 <a class="jxr_linenumber" name="21" href="#21">21</a>  
 <a class="jxr_linenumber" name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.util.ArrayList;
 <a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.util.Collections;
-<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.util.List;
-<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.util.Set;
-<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.util.Timer;
-<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> java.util.TimerTask;
-<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.ConcurrentSkipListSet;
-<a class="jxr_linenumber" name="29" href="#29">29</a>  
-<a class="jxr_linenumber" name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ConfigAccessor;
-<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ConfigChangeListener;
-<a class="jxr_linenumber" name="32" href="#32">32</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ConfigScope;
-<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ConfigScopeBuilder;
-<a class="jxr_linenumber" name="34" href="#34">34</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ControllerChangeListener;
-<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.CurrentStateChangeListener;
-<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ExternalViewChangeListener;
-<a class="jxr_linenumber" name="37" href="#37">37</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.HealthStateChangeListener;
-<a class="jxr_linenumber" name="38" href="#38">38</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.HelixDataAccessor;
-<a class="jxr_linenumber" name="39" href="#39">39</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.HelixManager;
-<a class="jxr_linenumber" name="40" href="#40">40</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.IdealStateChangeListener;
-<a class="jxr_linenumber" name="41" href="#41">41</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.LiveInstanceChangeListener;
-<a class="jxr_linenumber" name="42" href="#42">42</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.MessageListener;
-<a class="jxr_linenumber" name="43" href="#43">43</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.NotificationContext;
-<a class="jxr_linenumber" name="44" href="#44">44</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ZNRecord;
-<a class="jxr_linenumber" name="45" href="#45">45</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.NotificationContext.Type;
-<a class="jxr_linenumber" name="46" href="#46">46</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.PropertyKey.Builder;
-<a class="jxr_linenumber" name="47" href="#47">47</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.pipeline.Pipeline;
-<a class="jxr_linenumber" name="48" href="#48">48</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.pipeline.PipelineRegistry;
-<a class="jxr_linenumber" name="49" href="#49">49</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.BestPossibleStateCalcStage;
-<a class="jxr_linenumber" name="50" href="#50">50</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.ClusterEvent;
-<a class="jxr_linenumber" name="51" href="#51">51</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.CompatibilityCheckStage;
-<a class="jxr_linenumber" name="52" href="#52">52</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.CurrentStateComputationStage;
-<a class="jxr_linenumber" name="53" href="#53">53</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.ExternalViewComputeStage;
-<a class="jxr_linenumber" name="54" href="#54">54</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.MessageGenerationPhase;
-<a class="jxr_linenumber" name="55" href="#55">55</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.MessageSelectionStage;
-<a class="jxr_linenumber" name="56" href="#56">56</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.MessageThrottleStage;
-<a class="jxr_linenumber" name="57" href="#57">57</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.ReadClusterDataStage;
-<a class="jxr_linenumber" name="58" href="#58">58</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.ResourceComputationStage;
-<a class="jxr_linenumber" name="59" href="#59">59</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.TaskAssignmentStage;
-<a class="jxr_linenumber" name="60" href="#60">60</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.CurrentState;
-<a class="jxr_linenumber" name="61" href="#61">61</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.ExternalView;
-<a class="jxr_linenumber" name="62" href="#62">62</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.HealthStat;
-<a class="jxr_linenumber" name="63" href="#63">63</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.IdealState;
-<a class="jxr_linenumber" name="64" href="#64">64</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.InstanceConfig;
-<a class="jxr_linenumber" name="65" href="#65">65</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.LiveInstance;
-<a class="jxr_linenumber" name="66" href="#66">66</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.Message;
-<a class="jxr_linenumber" name="67" href="#67">67</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.PauseSignal;
-<a class="jxr_linenumber" name="68" href="#68">68</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.monitoring.mbeans.ClusterStatusMonitor;
-<a class="jxr_linenumber" name="69" href="#69">69</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.monitoring.mbeans.MessageQueueMonitor;
-<a class="jxr_linenumber" name="70" href="#70">70</a>  <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
-<a class="jxr_linenumber" name="71" href="#71">71</a>  
-<a class="jxr_linenumber" name="72" href="#72">72</a>  
-<a class="jxr_linenumber" name="73" href="#73">73</a>  <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="74" href="#74">74</a>  <em class="jxr_javadoccomment"> * Cluster Controllers main goal is to keep the cluster state as close as possible to</em>
-<a class="jxr_linenumber" name="75" href="#75">75</a>  <em class="jxr_javadoccomment"> * Ideal State. It does this by listening to changes in cluster state and scheduling new</em>
-<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment"> * tasks to get cluster state to best possible ideal state. Every instance of this class</em>
-<a class="jxr_linenumber" name="77" href="#77">77</a>  <em class="jxr_javadoccomment"> * can control can control only one cluster</em>
-<a class="jxr_linenumber" name="78" href="#78">78</a>  <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="79" href="#79">79</a>  <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="80" href="#80">80</a>  <em class="jxr_javadoccomment"> * Get all the partitions use IdealState, CurrentState and Messages &lt;br&gt;</em>
-<a class="jxr_linenumber" name="81" href="#81">81</a>  <em class="jxr_javadoccomment"> * foreach partition &lt;br&gt;</em>
-<a class="jxr_linenumber" name="82" href="#82">82</a>  <em class="jxr_javadoccomment"> * 1. get the (instance,state) from IdealState, CurrentState and PendingMessages &lt;br&gt;</em>
-<a class="jxr_linenumber" name="83" href="#83">83</a>  <em class="jxr_javadoccomment"> * 2. compute best possible state (instance,state) pair. This needs previous step data and</em>
-<a class="jxr_linenumber" name="84" href="#84">84</a>  <em class="jxr_javadoccomment"> * state model constraints &lt;br&gt;</em>
-<a class="jxr_linenumber" name="85" href="#85">85</a>  <em class="jxr_javadoccomment"> * 3. compute the messages/tasks needed to move to 1 to 2 &lt;br&gt;</em>
-<a class="jxr_linenumber" name="86" href="#86">86</a>  <em class="jxr_javadoccomment"> * 4. select the messages that can be sent, needs messages and state model constraints &lt;br&gt;</em>
-<a class="jxr_linenumber" name="87" href="#87">87</a>  <em class="jxr_javadoccomment"> * 5. send messages</em>
-<a class="jxr_linenumber" name="88" href="#88">88</a>  <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="89" href="#89">89</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">GenericHelixController</a> <strong class="jxr_keyword">implements</strong>
-<a class="jxr_linenumber" name="90" href="#90">90</a>      ConfigChangeListener,
-<a class="jxr_linenumber" name="91" href="#91">91</a>      IdealStateChangeListener,
-<a class="jxr_linenumber" name="92" href="#92">92</a>      LiveInstanceChangeListener,
-<a class="jxr_linenumber" name="93" href="#93">93</a>      MessageListener,
-<a class="jxr_linenumber" name="94" href="#94">94</a>      CurrentStateChangeListener,
-<a class="jxr_linenumber" name="95" href="#95">95</a>      ExternalViewChangeListener,
-<a class="jxr_linenumber" name="96" href="#96">96</a>      ControllerChangeListener,
-<a class="jxr_linenumber" name="97" href="#97">97</a>      <a href="../../../../org/apache/helix/HealthStateChangeListener.html">HealthStateChangeListener</a>
-<a class="jxr_linenumber" name="98" href="#98">98</a>  {
-<a class="jxr_linenumber" name="99" href="#99">99</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Logger    logger =
-<a class="jxr_linenumber" name="100" href="#100">100</a>                                             Logger.getLogger(GenericHelixController.<strong class="jxr_keyword">class</strong>.getName());
-<a class="jxr_linenumber" name="101" href="#101">101</a>   <strong class="jxr_keyword">volatile</strong> <strong class="jxr_keyword">boolean</strong>               init   = false;
-<a class="jxr_linenumber" name="102" href="#102">102</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/helix/controller/pipeline/PipelineRegistry.html">PipelineRegistry</a> _registry;
-<a class="jxr_linenumber" name="103" href="#103">103</a> 
-<a class="jxr_linenumber" name="104" href="#104">104</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="105" href="#105">105</a> <em class="jxr_javadoccomment">   * Since instance current state is per-session-id, we need to track the session-ids of</em>
-<a class="jxr_linenumber" name="106" href="#106">106</a> <em class="jxr_javadoccomment">   * the current states that the ClusterController is observing. this set contains all the</em>
-<a class="jxr_linenumber" name="107" href="#107">107</a> <em class="jxr_javadoccomment">   * session ids that we add currentState listener</em>
-<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="109" href="#109">109</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> Set&lt;String&gt;      _instanceCurrentStateChangeSubscriptionSessionIds;
-<a class="jxr_linenumber" name="110" href="#110">110</a> 
-<a class="jxr_linenumber" name="111" href="#111">111</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment">   * this set contains all the instance names that we add message listener</em>
-<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="114" href="#114">114</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> Set&lt;String&gt;      _instanceSubscriptionNames;
-<a class="jxr_linenumber" name="115" href="#115">115</a> 
-<a class="jxr_linenumber" name="116" href="#116">116</a>   <a href="../../../../org/apache/helix/monitoring/mbeans/ClusterStatusMonitor.html">ClusterStatusMonitor</a>           _clusterStatusMonitor;
-<a class="jxr_linenumber" name="117" href="#117">117</a>   
-<a class="jxr_linenumber" name="118" href="#118">118</a> 
-<a class="jxr_linenumber" name="119" href="#119">119</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment">   * The _paused flag is checked by function handleEvent(), while if the flag is set</em>
-<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment">   * handleEvent() will be no-op. Other event handling logic keeps the same when the flag</em>
-<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment">   * is set.</em>
+<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.util.HashMap;
+<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.util.List;
+<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.util.Map;
+<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> java.util.Set;
+<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> java.util.Timer;
+<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> java.util.TimerTask;
+<a class="jxr_linenumber" name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.ConcurrentSkipListSet;
+<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.atomic.AtomicReference;
+<a class="jxr_linenumber" name="32" href="#32">32</a>  
+<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ConfigAccessor;
+<a class="jxr_linenumber" name="34" href="#34">34</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ConfigChangeListener;
+<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ConfigScope;
+<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ConfigScopeBuilder;
+<a class="jxr_linenumber" name="37" href="#37">37</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ControllerChangeListener;
+<a class="jxr_linenumber" name="38" href="#38">38</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.CurrentStateChangeListener;
+<a class="jxr_linenumber" name="39" href="#39">39</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ExternalViewChangeListener;
+<a class="jxr_linenumber" name="40" href="#40">40</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.HealthStateChangeListener;
+<a class="jxr_linenumber" name="41" href="#41">41</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.HelixDataAccessor;
+<a class="jxr_linenumber" name="42" href="#42">42</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.HelixManager;
+<a class="jxr_linenumber" name="43" href="#43">43</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.IdealStateChangeListener;
+<a class="jxr_linenumber" name="44" href="#44">44</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.LiveInstanceChangeListener;
+<a class="jxr_linenumber" name="45" href="#45">45</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.MessageListener;
+<a class="jxr_linenumber" name="46" href="#46">46</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.NotificationContext;
+<a class="jxr_linenumber" name="47" href="#47">47</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.ZNRecord;
+<a class="jxr_linenumber" name="48" href="#48">48</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.NotificationContext.Type;
+<a class="jxr_linenumber" name="49" href="#49">49</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.PropertyKey.Builder;
+<a class="jxr_linenumber" name="50" href="#50">50</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.pipeline.Pipeline;
+<a class="jxr_linenumber" name="51" href="#51">51</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.pipeline.PipelineRegistry;
+<a class="jxr_linenumber" name="52" href="#52">52</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.BestPossibleStateCalcStage;
+<a class="jxr_linenumber" name="53" href="#53">53</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.ClusterEvent;
+<a class="jxr_linenumber" name="54" href="#54">54</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.CompatibilityCheckStage;
+<a class="jxr_linenumber" name="55" href="#55">55</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.CurrentStateComputationStage;
+<a class="jxr_linenumber" name="56" href="#56">56</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.ExternalViewComputeStage;
+<a class="jxr_linenumber" name="57" href="#57">57</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.MessageGenerationPhase;
+<a class="jxr_linenumber" name="58" href="#58">58</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.MessageSelectionStage;
+<a class="jxr_linenumber" name="59" href="#59">59</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.MessageThrottleStage;
+<a class="jxr_linenumber" name="60" href="#60">60</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.ReadClusterDataStage;
+<a class="jxr_linenumber" name="61" href="#61">61</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.ResourceComputationStage;
+<a class="jxr_linenumber" name="62" href="#62">62</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.controller.stages.TaskAssignmentStage;
+<a class="jxr_linenumber" name="63" href="#63">63</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.CurrentState;
+<a class="jxr_linenumber" name="64" href="#64">64</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.ExternalView;
+<a class="jxr_linenumber" name="65" href="#65">65</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.HealthStat;
+<a class="jxr_linenumber" name="66" href="#66">66</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.IdealState;
+<a class="jxr_linenumber" name="67" href="#67">67</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.InstanceConfig;
+<a class="jxr_linenumber" name="68" href="#68">68</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.LiveInstance;
+<a class="jxr_linenumber" name="69" href="#69">69</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.Message;
+<a class="jxr_linenumber" name="70" href="#70">70</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.model.PauseSignal;
+<a class="jxr_linenumber" name="71" href="#71">71</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.monitoring.mbeans.ClusterStatusMonitor;
+<a class="jxr_linenumber" name="72" href="#72">72</a>  <strong class="jxr_keyword">import</strong> org.apache.helix.monitoring.mbeans.MessageQueueMonitor;
+<a class="jxr_linenumber" name="73" href="#73">73</a>  <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
+<a class="jxr_linenumber" name="74" href="#74">74</a>  
+<a class="jxr_linenumber" name="75" href="#75">75</a>  
+<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="77" href="#77">77</a>  <em class="jxr_javadoccomment"> * Cluster Controllers main goal is to keep the cluster state as close as possible to</em>
+<a class="jxr_linenumber" name="78" href="#78">78</a>  <em class="jxr_javadoccomment"> * Ideal State. It does this by listening to changes in cluster state and scheduling new</em>
+<a class="jxr_linenumber" name="79" href="#79">79</a>  <em class="jxr_javadoccomment"> * tasks to get cluster state to best possible ideal state. Every instance of this class</em>
+<a class="jxr_linenumber" name="80" href="#80">80</a>  <em class="jxr_javadoccomment"> * can control can control only one cluster</em>
+<a class="jxr_linenumber" name="81" href="#81">81</a>  <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="82" href="#82">82</a>  <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="83" href="#83">83</a>  <em class="jxr_javadoccomment"> * Get all the partitions use IdealState, CurrentState and Messages &lt;br&gt;</em>
+<a class="jxr_linenumber" name="84" href="#84">84</a>  <em class="jxr_javadoccomment"> * foreach partition &lt;br&gt;</em>
+<a class="jxr_linenumber" name="85" href="#85">85</a>  <em class="jxr_javadoccomment"> * 1. get the (instance,state) from IdealState, CurrentState and PendingMessages &lt;br&gt;</em>
+<a class="jxr_linenumber" name="86" href="#86">86</a>  <em class="jxr_javadoccomment"> * 2. compute best possible state (instance,state) pair. This needs previous step data and</em>
+<a class="jxr_linenumber" name="87" href="#87">87</a>  <em class="jxr_javadoccomment"> * state model constraints &lt;br&gt;</em>
+<a class="jxr_linenumber" name="88" href="#88">88</a>  <em class="jxr_javadoccomment"> * 3. compute the messages/tasks needed to move to 1 to 2 &lt;br&gt;</em>
+<a class="jxr_linenumber" name="89" href="#89">89</a>  <em class="jxr_javadoccomment"> * 4. select the messages that can be sent, needs messages and state model constraints &lt;br&gt;</em>
+<a class="jxr_linenumber" name="90" href="#90">90</a>  <em class="jxr_javadoccomment"> * 5. send messages</em>
+<a class="jxr_linenumber" name="91" href="#91">91</a>  <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="92" href="#92">92</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">GenericHelixController</a> <strong class="jxr_keyword">implements</strong>
+<a class="jxr_linenumber" name="93" href="#93">93</a>      ConfigChangeListener,
+<a class="jxr_linenumber" name="94" href="#94">94</a>      IdealStateChangeListener,
+<a class="jxr_linenumber" name="95" href="#95">95</a>      LiveInstanceChangeListener,
+<a class="jxr_linenumber" name="96" href="#96">96</a>      MessageListener,
+<a class="jxr_linenumber" name="97" href="#97">97</a>      CurrentStateChangeListener,
+<a class="jxr_linenumber" name="98" href="#98">98</a>      ExternalViewChangeListener,
+<a class="jxr_linenumber" name="99" href="#99">99</a>      ControllerChangeListener,
+<a class="jxr_linenumber" name="100" href="#100">100</a>     <a href="../../../../org/apache/helix/HealthStateChangeListener.html">HealthStateChangeListener</a>
+<a class="jxr_linenumber" name="101" href="#101">101</a> {
+<a class="jxr_linenumber" name="102" href="#102">102</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Logger    logger =
+<a class="jxr_linenumber" name="103" href="#103">103</a>                                             Logger.getLogger(GenericHelixController.<strong class="jxr_keyword">class</strong>.getName());
+<a class="jxr_linenumber" name="104" href="#104">104</a>   <strong class="jxr_keyword">volatile</strong> <strong class="jxr_keyword">boolean</strong>               init   = false;
+<a class="jxr_linenumber" name="105" href="#105">105</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/helix/controller/pipeline/PipelineRegistry.html">PipelineRegistry</a> _registry;
+<a class="jxr_linenumber" name="106" href="#106">106</a> 
+<a class="jxr_linenumber" name="107" href="#107">107</a>   <strong class="jxr_keyword">final</strong> AtomicReference&lt;Map&lt;String, LiveInstance&gt;&gt;	_lastSeenInstances;
+<a class="jxr_linenumber" name="108" href="#108">108</a>   <strong class="jxr_keyword">final</strong> AtomicReference&lt;Map&lt;String, LiveInstance&gt;&gt;	_lastSeenSessions;
+<a class="jxr_linenumber" name="109" href="#109">109</a>   
+<a class="jxr_linenumber" name="110" href="#110">110</a>   <a href="../../../../org/apache/helix/monitoring/mbeans/ClusterStatusMonitor.html">ClusterStatusMonitor</a>           _clusterStatusMonitor;
+<a class="jxr_linenumber" name="111" href="#111">111</a>   
+<a class="jxr_linenumber" name="112" href="#112">112</a> 
+<a class="jxr_linenumber" name="113" href="#113">113</a>   <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment">   * The _paused flag is checked by function handleEvent(), while if the flag is set</em>
+<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment">   * handleEvent() will be no-op. Other event handling logic keeps the same when the flag</em>
+<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment">   * is set.</em>
+<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment">   */</em>
+<a class="jxr_linenumber" name="118" href="#118">118</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong>                _paused;
+<a class="jxr_linenumber" name="119" href="#119">119</a> 
+<a class="jxr_linenumber" name="120" href="#120">120</a>   <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment">   * The timer that can periodically run the rebalancing pipeline. The timer will start if there</em>
+<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment">   * is one resource group has the config to use the timer.</em>
 <a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="124" href="#124">124</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong>                _paused;
-<a class="jxr_linenumber" name="125" href="#125">125</a> 
-<a class="jxr_linenumber" name="126" href="#126">126</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment">   * The timer that can periodically run the rebalancing pipeline. The timer will start if there</em>
-<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment">   * is one resource group has the config to use the timer.</em>
-<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="130" href="#130">130</a>   Timer _rebalanceTimer = <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="131" href="#131">131</a>   <strong class="jxr_keyword">int</strong> _timerPeriod = Integer.MAX_VALUE;
-<a class="jxr_linenumber" name="132" href="#132">132</a> 
-<a class="jxr_linenumber" name="133" href="#133">133</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="134" href="#134">134</a> <em class="jxr_javadoccomment">   * Default constructor that creates a default pipeline registry. This is sufficient in</em>
-<a class="jxr_linenumber" name="135" href="#135">135</a> <em class="jxr_javadoccomment">   * most cases, but if there is a some thing specific needed use another constructor</em>
-<a class="jxr_linenumber" name="136" href="#136">136</a> <em class="jxr_javadoccomment">   * where in you can pass a pipeline registry</em>
-<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="138" href="#138">138</a>   <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">GenericHelixController</a>()
-<a class="jxr_linenumber" name="139" href="#139">139</a>   {
-<a class="jxr_linenumber" name="140" href="#140">140</a>     <strong class="jxr_keyword">this</strong>(createDefaultRegistry());
-<a class="jxr_linenumber" name="141" href="#141">141</a>   }
-<a class="jxr_linenumber" name="142" href="#142">142</a> 
-<a class="jxr_linenumber" name="143" href="#143">143</a>   <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">RebalanceTask</a> <strong class="jxr_keyword">extends</strong> TimerTask
-<a class="jxr_linenumber" name="144" href="#144">144</a>   {
-<a class="jxr_linenumber" name="145" href="#145">145</a>     <a href="../../../../org/apache/helix/HelixManager.html">HelixManager</a> _manager;
-<a class="jxr_linenumber" name="146" href="#146">146</a>     
-<a class="jxr_linenumber" name="147" href="#147">147</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">RebalanceTask</a>(<a href="../../../../org/apache/helix/HelixManager.html">HelixManager</a> manager)
+<a class="jxr_linenumber" name="124" href="#124">124</a>   Timer _rebalanceTimer = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="125" href="#125">125</a>   <strong class="jxr_keyword">int</strong> _timerPeriod = Integer.MAX_VALUE;
+<a class="jxr_linenumber" name="126" href="#126">126</a> 
+<a class="jxr_linenumber" name="127" href="#127">127</a>   <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment">   * Default constructor that creates a default pipeline registry. This is sufficient in</em>
+<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment">   * most cases, but if there is a some thing specific needed use another constructor</em>
+<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment">   * where in you can pass a pipeline registry</em>
+<a class="jxr_linenumber" name="131" href="#131">131</a> <em class="jxr_javadoccomment">   */</em>
+<a class="jxr_linenumber" name="132" href="#132">132</a>   <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">GenericHelixController</a>()
+<a class="jxr_linenumber" name="133" href="#133">133</a>   {
+<a class="jxr_linenumber" name="134" href="#134">134</a>     <strong class="jxr_keyword">this</strong>(createDefaultRegistry());
+<a class="jxr_linenumber" name="135" href="#135">135</a>   }
+<a class="jxr_linenumber" name="136" href="#136">136</a> 
+<a class="jxr_linenumber" name="137" href="#137">137</a>   <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">RebalanceTask</a> <strong class="jxr_keyword">extends</strong> TimerTask
+<a class="jxr_linenumber" name="138" href="#138">138</a>   {
+<a class="jxr_linenumber" name="139" href="#139">139</a>     <a href="../../../../org/apache/helix/HelixManager.html">HelixManager</a> _manager;
+<a class="jxr_linenumber" name="140" href="#140">140</a>     
+<a class="jxr_linenumber" name="141" href="#141">141</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">RebalanceTask</a>(<a href="../../../../org/apache/helix/HelixManager.html">HelixManager</a> manager)
+<a class="jxr_linenumber" name="142" href="#142">142</a>     {
+<a class="jxr_linenumber" name="143" href="#143">143</a>       _manager = manager;
+<a class="jxr_linenumber" name="144" href="#144">144</a>     }
+<a class="jxr_linenumber" name="145" href="#145">145</a>     
+<a class="jxr_linenumber" name="146" href="#146">146</a>     @Override
+<a class="jxr_linenumber" name="147" href="#147">147</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run()
 <a class="jxr_linenumber" name="148" href="#148">148</a>     {
-<a class="jxr_linenumber" name="149" href="#149">149</a>       _manager = manager;
-<a class="jxr_linenumber" name="150" href="#150">150</a>     }
-<a class="jxr_linenumber" name="151" href="#151">151</a>     
-<a class="jxr_linenumber" name="152" href="#152">152</a>     @Override
-<a class="jxr_linenumber" name="153" href="#153">153</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run()
-<a class="jxr_linenumber" name="154" href="#154">154</a>     {
-<a class="jxr_linenumber" name="155" href="#155">155</a>       <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a> changeContext = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a>(_manager);
-<a class="jxr_linenumber" name="156" href="#156">156</a>       changeContext.setType(NotificationContext.Type.CALLBACK);
-<a class="jxr_linenumber" name="157" href="#157">157</a>       <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a> event = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a>(<span class="jxr_string">"periodicalRebalance"</span>);
-<a class="jxr_linenumber" name="158" href="#158">158</a>       event.addAttribute(<span class="jxr_string">"helixmanager"</span>, changeContext.getManager());
-<a class="jxr_linenumber" name="159" href="#159">159</a>       event.addAttribute(<span class="jxr_string">"changeContext"</span>, changeContext);
-<a class="jxr_linenumber" name="160" href="#160">160</a>       List&lt;ZNRecord&gt; dummy = <strong class="jxr_keyword">new</strong> ArrayList&lt;ZNRecord&gt;();
-<a class="jxr_linenumber" name="161" href="#161">161</a>       event.addAttribute(<span class="jxr_string">"eventData"</span>, dummy);
-<a class="jxr_linenumber" name="162" href="#162">162</a>       <em class="jxr_comment">// Should be able to process  </em>
-<a class="jxr_linenumber" name="163" href="#163">163</a>       handleEvent(event);
-<a class="jxr_linenumber" name="164" href="#164">164</a>     }
-<a class="jxr_linenumber" name="165" href="#165">165</a>   }
-<a class="jxr_linenumber" name="166" href="#166">166</a>   
-<a class="jxr_linenumber" name="167" href="#167">167</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="168" href="#168">168</a> <em class="jxr_javadoccomment">   * Starts the rebalancing timer with the specified period. Start the timer if necessary;</em>
-<a class="jxr_linenumber" name="169" href="#169">169</a> <em class="jxr_javadoccomment">   * If the period is smaller than the current period, cancel the current timer and use </em>
-<a class="jxr_linenumber" name="170" href="#170">170</a> <em class="jxr_javadoccomment">   * the new period.</em>
-<a class="jxr_linenumber" name="171" href="#171">171</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="172" href="#172">172</a>   <strong class="jxr_keyword">void</strong> startRebalancingTimer(<strong class="jxr_keyword">int</strong> period, <a href="../../../../org/apache/helix/HelixManager.html">HelixManager</a> manager)
-<a class="jxr_linenumber" name="173" href="#173">173</a>   {
-<a class="jxr_linenumber" name="174" href="#174">174</a>     logger.info(<span class="jxr_string">"Controller starting timer at period "</span> + period);
-<a class="jxr_linenumber" name="175" href="#175">175</a>     <strong class="jxr_keyword">if</strong>(period &lt; _timerPeriod)
-<a class="jxr_linenumber" name="176" href="#176">176</a>     {
-<a class="jxr_linenumber" name="177" href="#177">177</a>       <strong class="jxr_keyword">if</strong>(_rebalanceTimer != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="178" href="#178">178</a>       {
-<a class="jxr_linenumber" name="179" href="#179">179</a>         _rebalanceTimer.cancel();
-<a class="jxr_linenumber" name="180" href="#180">180</a>       }
-<a class="jxr_linenumber" name="181" href="#181">181</a>       _rebalanceTimer = <strong class="jxr_keyword">new</strong> Timer(<strong class="jxr_keyword">true</strong>);
-<a class="jxr_linenumber" name="182" href="#182">182</a>       _timerPeriod = period;
-<a class="jxr_linenumber" name="183" href="#183">183</a>       _rebalanceTimer.scheduleAtFixedRate(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">RebalanceTask</a>(manager), _timerPeriod, _timerPeriod);
-<a class="jxr_linenumber" name="184" href="#184">184</a>     }
-<a class="jxr_linenumber" name="185" href="#185">185</a>     <strong class="jxr_keyword">else</strong>
-<a class="jxr_linenumber" name="186" href="#186">186</a>     {
-<a class="jxr_linenumber" name="187" href="#187">187</a>       logger.info(<span class="jxr_string">"Controller already has timer at period "</span> + _timerPeriod);
-<a class="jxr_linenumber" name="188" href="#188">188</a>     }
-<a class="jxr_linenumber" name="189" href="#189">189</a>   }
-<a class="jxr_linenumber" name="190" href="#190">190</a>   
-<a class="jxr_linenumber" name="191" href="#191">191</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="192" href="#192">192</a> <em class="jxr_javadoccomment">   * Starts the rebalancing timer </em>
-<a class="jxr_linenumber" name="193" href="#193">193</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="194" href="#194">194</a>   <strong class="jxr_keyword">void</strong> stopRebalancingTimer()
-<a class="jxr_linenumber" name="195" href="#195">195</a>   {
-<a class="jxr_linenumber" name="196" href="#196">196</a>     <strong class="jxr_keyword">if</strong>(_rebalanceTimer != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="197" href="#197">197</a>     {
-<a class="jxr_linenumber" name="198" href="#198">198</a>       _rebalanceTimer.cancel();
-<a class="jxr_linenumber" name="199" href="#199">199</a>       _rebalanceTimer = <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="200" href="#200">200</a>     }
-<a class="jxr_linenumber" name="201" href="#201">201</a>     _timerPeriod = Integer.MAX_VALUE;
-<a class="jxr_linenumber" name="202" href="#202">202</a>   }
-<a class="jxr_linenumber" name="203" href="#203">203</a>   
-<a class="jxr_linenumber" name="204" href="#204">204</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../org/apache/helix/controller/pipeline/PipelineRegistry.html">PipelineRegistry</a> createDefaultRegistry()
-<a class="jxr_linenumber" name="205" href="#205">205</a>   {
-<a class="jxr_linenumber" name="206" href="#206">206</a>     logger.info(<span class="jxr_string">"createDefaultRegistry"</span>);
-<a class="jxr_linenumber" name="207" href="#207">207</a>     <strong class="jxr_keyword">synchronized</strong> (GenericHelixController.<strong class="jxr_keyword">class</strong>)
-<a class="jxr_linenumber" name="208" href="#208">208</a>     {
-<a class="jxr_linenumber" name="209" href="#209">209</a>       <a href="../../../../org/apache/helix/controller/pipeline/PipelineRegistry.html">PipelineRegistry</a> registry = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/pipeline/PipelineRegistry.html">PipelineRegistry</a>();
-<a class="jxr_linenumber" name="210" href="#210">210</a> 
-<a class="jxr_linenumber" name="211" href="#211">211</a>       <em class="jxr_comment">// cluster data cache refresh</em>
-<a class="jxr_linenumber" name="212" href="#212">212</a>       <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a> dataRefresh = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a>();
-<a class="jxr_linenumber" name="213" href="#213">213</a>       dataRefresh.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ReadClusterDataStage.html">ReadClusterDataStage</a>());
-<a class="jxr_linenumber" name="214" href="#214">214</a> 
-<a class="jxr_linenumber" name="215" href="#215">215</a>       <em class="jxr_comment">// rebalance pipeline</em>
-<a class="jxr_linenumber" name="216" href="#216">216</a>       <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a> rebalancePipeline = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a>();
-<a class="jxr_linenumber" name="217" href="#217">217</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ResourceComputationStage.html">ResourceComputationStage</a>());
-<a class="jxr_linenumber" name="218" href="#218">218</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/CurrentStateComputationStage.html">CurrentStateComputationStage</a>());
-<a class="jxr_linenumber" name="219" href="#219">219</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/BestPossibleStateCalcStage.html">BestPossibleStateCalcStage</a>());
-<a class="jxr_linenumber" name="220" href="#220">220</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/MessageGenerationPhase.html">MessageGenerationPhase</a>());
-<a class="jxr_linenumber" name="221" href="#221">221</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/MessageSelectionStage.html">MessageSelectionStage</a>());
-<a class="jxr_linenumber" name="222" href="#222">222</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/MessageThrottleStage.html">MessageThrottleStage</a>());
-<a class="jxr_linenumber" name="223" href="#223">223</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/TaskAssignmentStage.html">TaskAssignmentStage</a>());
-<a class="jxr_linenumber" name="224" href="#224">224</a> 
-<a class="jxr_linenumber" name="225" href="#225">225</a>       <em class="jxr_comment">// external view generation</em>
-<a class="jxr_linenumber" name="226" href="#226">226</a>       <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a> externalViewPipeline = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a>();
-<a class="jxr_linenumber" name="227" href="#227">227</a>       externalViewPipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ExternalViewComputeStage.html">ExternalViewComputeStage</a>());
-<a class="jxr_linenumber" name="228" href="#228">228</a> 
-<a class="jxr_linenumber" name="229" href="#229">229</a>       <em class="jxr_comment">// backward compatibility check</em>
-<a class="jxr_linenumber" name="230" href="#230">230</a>       <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a> liveInstancePipeline = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a>();
-<a class="jxr_linenumber" name="231" href="#231">231</a>       liveInstancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/CompatibilityCheckStage.html">CompatibilityCheckStage</a>());
-<a class="jxr_linenumber" name="232" href="#232">232</a> 
-<a class="jxr_linenumber" name="233" href="#233">233</a>       registry.register(<span class="jxr_string">"idealStateChange"</span>, dataRefresh, rebalancePipeline);
-<a class="jxr_linenumber" name="234" href="#234">234</a>       registry.register(<span class="jxr_string">"currentStateChange"</span>,
-<a class="jxr_linenumber" name="235" href="#235">235</a>                         dataRefresh,
+<a class="jxr_linenumber" name="149" href="#149">149</a>       <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a> changeContext = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a>(_manager);
+<a class="jxr_linenumber" name="150" href="#150">150</a>       changeContext.setType(NotificationContext.Type.CALLBACK);
+<a class="jxr_linenumber" name="151" href="#151">151</a>       <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a> event = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a>(<span class="jxr_string">"periodicalRebalance"</span>);
+<a class="jxr_linenumber" name="152" href="#152">152</a>       event.addAttribute(<span class="jxr_string">"helixmanager"</span>, changeContext.getManager());
+<a class="jxr_linenumber" name="153" href="#153">153</a>       event.addAttribute(<span class="jxr_string">"changeContext"</span>, changeContext);
+<a class="jxr_linenumber" name="154" href="#154">154</a>       List&lt;ZNRecord&gt; dummy = <strong class="jxr_keyword">new</strong> ArrayList&lt;ZNRecord&gt;();
+<a class="jxr_linenumber" name="155" href="#155">155</a>       event.addAttribute(<span class="jxr_string">"eventData"</span>, dummy);
+<a class="jxr_linenumber" name="156" href="#156">156</a>       <em class="jxr_comment">// Should be able to process  </em>
+<a class="jxr_linenumber" name="157" href="#157">157</a>       handleEvent(event);
+<a class="jxr_linenumber" name="158" href="#158">158</a>     }
+<a class="jxr_linenumber" name="159" href="#159">159</a>   }
+<a class="jxr_linenumber" name="160" href="#160">160</a>   
+<a class="jxr_linenumber" name="161" href="#161">161</a>   <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="162" href="#162">162</a> <em class="jxr_javadoccomment">   * Starts the rebalancing timer with the specified period. Start the timer if necessary;</em>
+<a class="jxr_linenumber" name="163" href="#163">163</a> <em class="jxr_javadoccomment">   * If the period is smaller than the current period, cancel the current timer and use </em>
+<a class="jxr_linenumber" name="164" href="#164">164</a> <em class="jxr_javadoccomment">   * the new period.</em>
+<a class="jxr_linenumber" name="165" href="#165">165</a> <em class="jxr_javadoccomment">   */</em>
+<a class="jxr_linenumber" name="166" href="#166">166</a>   <strong class="jxr_keyword">void</strong> startRebalancingTimer(<strong class="jxr_keyword">int</strong> period, <a href="../../../../org/apache/helix/HelixManager.html">HelixManager</a> manager)
+<a class="jxr_linenumber" name="167" href="#167">167</a>   {
+<a class="jxr_linenumber" name="168" href="#168">168</a>     logger.info(<span class="jxr_string">"Controller starting timer at period "</span> + period);
+<a class="jxr_linenumber" name="169" href="#169">169</a>     <strong class="jxr_keyword">if</strong>(period &lt; _timerPeriod)
+<a class="jxr_linenumber" name="170" href="#170">170</a>     {
+<a class="jxr_linenumber" name="171" href="#171">171</a>       <strong class="jxr_keyword">if</strong>(_rebalanceTimer != <strong class="jxr_keyword">null</strong>)
+<a class="jxr_linenumber" name="172" href="#172">172</a>       {
+<a class="jxr_linenumber" name="173" href="#173">173</a>         _rebalanceTimer.cancel();
+<a class="jxr_linenumber" name="174" href="#174">174</a>       }
+<a class="jxr_linenumber" name="175" href="#175">175</a>       _rebalanceTimer = <strong class="jxr_keyword">new</strong> Timer(<strong class="jxr_keyword">true</strong>);
+<a class="jxr_linenumber" name="176" href="#176">176</a>       _timerPeriod = period;
+<a class="jxr_linenumber" name="177" href="#177">177</a>       _rebalanceTimer.scheduleAtFixedRate(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">RebalanceTask</a>(manager), _timerPeriod, _timerPeriod);
+<a class="jxr_linenumber" name="178" href="#178">178</a>     }
+<a class="jxr_linenumber" name="179" href="#179">179</a>     <strong class="jxr_keyword">else</strong>
+<a class="jxr_linenumber" name="180" href="#180">180</a>     {
+<a class="jxr_linenumber" name="181" href="#181">181</a>       logger.info(<span class="jxr_string">"Controller already has timer at period "</span> + _timerPeriod);
+<a class="jxr_linenumber" name="182" href="#182">182</a>     }
+<a class="jxr_linenumber" name="183" href="#183">183</a>   }
+<a class="jxr_linenumber" name="184" href="#184">184</a>   
+<a class="jxr_linenumber" name="185" href="#185">185</a>   <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="186" href="#186">186</a> <em class="jxr_javadoccomment">   * Starts the rebalancing timer </em>
+<a class="jxr_linenumber" name="187" href="#187">187</a> <em class="jxr_javadoccomment">   */</em>
+<a class="jxr_linenumber" name="188" href="#188">188</a>   <strong class="jxr_keyword">void</strong> stopRebalancingTimer()
+<a class="jxr_linenumber" name="189" href="#189">189</a>   {
+<a class="jxr_linenumber" name="190" href="#190">190</a>     <strong class="jxr_keyword">if</strong>(_rebalanceTimer != <strong class="jxr_keyword">null</strong>)
+<a class="jxr_linenumber" name="191" href="#191">191</a>     {
+<a class="jxr_linenumber" name="192" href="#192">192</a>       _rebalanceTimer.cancel();
+<a class="jxr_linenumber" name="193" href="#193">193</a>       _rebalanceTimer = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="194" href="#194">194</a>     }
+<a class="jxr_linenumber" name="195" href="#195">195</a>     _timerPeriod = Integer.MAX_VALUE;
+<a class="jxr_linenumber" name="196" href="#196">196</a>   }
+<a class="jxr_linenumber" name="197" href="#197">197</a>   
+<a class="jxr_linenumber" name="198" href="#198">198</a>   <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../org/apache/helix/controller/pipeline/PipelineRegistry.html">PipelineRegistry</a> createDefaultRegistry()
+<a class="jxr_linenumber" name="199" href="#199">199</a>   {
+<a class="jxr_linenumber" name="200" href="#200">200</a>     logger.info(<span class="jxr_string">"createDefaultRegistry"</span>);
+<a class="jxr_linenumber" name="201" href="#201">201</a>     <strong class="jxr_keyword">synchronized</strong> (GenericHelixController.<strong class="jxr_keyword">class</strong>)
+<a class="jxr_linenumber" name="202" href="#202">202</a>     {
+<a class="jxr_linenumber" name="203" href="#203">203</a>       <a href="../../../../org/apache/helix/controller/pipeline/PipelineRegistry.html">PipelineRegistry</a> registry = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/pipeline/PipelineRegistry.html">PipelineRegistry</a>();
+<a class="jxr_linenumber" name="204" href="#204">204</a> 
+<a class="jxr_linenumber" name="205" href="#205">205</a>       <em class="jxr_comment">// cluster data cache refresh</em>
+<a class="jxr_linenumber" name="206" href="#206">206</a>       <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a> dataRefresh = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a>();
+<a class="jxr_linenumber" name="207" href="#207">207</a>       dataRefresh.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ReadClusterDataStage.html">ReadClusterDataStage</a>());
+<a class="jxr_linenumber" name="208" href="#208">208</a> 
+<a class="jxr_linenumber" name="209" href="#209">209</a>       <em class="jxr_comment">// rebalance pipeline</em>
+<a class="jxr_linenumber" name="210" href="#210">210</a>       <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a> rebalancePipeline = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a>();
+<a class="jxr_linenumber" name="211" href="#211">211</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ResourceComputationStage.html">ResourceComputationStage</a>());
+<a class="jxr_linenumber" name="212" href="#212">212</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/CurrentStateComputationStage.html">CurrentStateComputationStage</a>());
+<a class="jxr_linenumber" name="213" href="#213">213</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/BestPossibleStateCalcStage.html">BestPossibleStateCalcStage</a>());
+<a class="jxr_linenumber" name="214" href="#214">214</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/MessageGenerationPhase.html">MessageGenerationPhase</a>());
+<a class="jxr_linenumber" name="215" href="#215">215</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/MessageSelectionStage.html">MessageSelectionStage</a>());
+<a class="jxr_linenumber" name="216" href="#216">216</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/MessageThrottleStage.html">MessageThrottleStage</a>());
+<a class="jxr_linenumber" name="217" href="#217">217</a>       rebalancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/TaskAssignmentStage.html">TaskAssignmentStage</a>());
+<a class="jxr_linenumber" name="218" href="#218">218</a> 
+<a class="jxr_linenumber" name="219" href="#219">219</a>       <em class="jxr_comment">// external view generation</em>
+<a class="jxr_linenumber" name="220" href="#220">220</a>       <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a> externalViewPipeline = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a>();
+<a class="jxr_linenumber" name="221" href="#221">221</a>       externalViewPipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ExternalViewComputeStage.html">ExternalViewComputeStage</a>());
+<a class="jxr_linenumber" name="222" href="#222">222</a> 
+<a class="jxr_linenumber" name="223" href="#223">223</a>       <em class="jxr_comment">// backward compatibility check</em>
+<a class="jxr_linenumber" name="224" href="#224">224</a>       <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a> liveInstancePipeline = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/pipeline/Pipeline.html">Pipeline</a>();
+<a class="jxr_linenumber" name="225" href="#225">225</a>       liveInstancePipeline.addStage(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/CompatibilityCheckStage.html">CompatibilityCheckStage</a>());
+<a class="jxr_linenumber" name="226" href="#226">226</a> 
+<a class="jxr_linenumber" name="227" href="#227">227</a>       registry.register(<span class="jxr_string">"idealStateChange"</span>, dataRefresh, rebalancePipeline);
+<a class="jxr_linenumber" name="228" href="#228">228</a>       registry.register(<span class="jxr_string">"currentStateChange"</span>,
+<a class="jxr_linenumber" name="229" href="#229">229</a>                         dataRefresh,
+<a class="jxr_linenumber" name="230" href="#230">230</a>                         rebalancePipeline,
+<a class="jxr_linenumber" name="231" href="#231">231</a>                         externalViewPipeline);
+<a class="jxr_linenumber" name="232" href="#232">232</a>       registry.register(<span class="jxr_string">"configChange"</span>, dataRefresh, rebalancePipeline);
+<a class="jxr_linenumber" name="233" href="#233">233</a>       registry.register(<span class="jxr_string">"liveInstanceChange"</span>,
+<a class="jxr_linenumber" name="234" href="#234">234</a>                         dataRefresh,
+<a class="jxr_linenumber" name="235" href="#235">235</a>                         liveInstancePipeline,
 <a class="jxr_linenumber" name="236" href="#236">236</a>                         rebalancePipeline,
 <a class="jxr_linenumber" name="237" href="#237">237</a>                         externalViewPipeline);
-<a class="jxr_linenumber" name="238" href="#238">238</a>       registry.register(<span class="jxr_string">"configChange"</span>, dataRefresh, rebalancePipeline);
-<a class="jxr_linenumber" name="239" href="#239">239</a>       registry.register(<span class="jxr_string">"liveInstanceChange"</span>,
+<a class="jxr_linenumber" name="238" href="#238">238</a> 
+<a class="jxr_linenumber" name="239" href="#239">239</a>       registry.register(<span class="jxr_string">"messageChange"</span>,
 <a class="jxr_linenumber" name="240" href="#240">240</a>                         dataRefresh,
-<a class="jxr_linenumber" name="241" href="#241">241</a>                         liveInstancePipeline,
-<a class="jxr_linenumber" name="242" href="#242">242</a>                         rebalancePipeline,
-<a class="jxr_linenumber" name="243" href="#243">243</a>                         externalViewPipeline);
-<a class="jxr_linenumber" name="244" href="#244">244</a> 
-<a class="jxr_linenumber" name="245" href="#245">245</a>       registry.register(<span class="jxr_string">"messageChange"</span>,
-<a class="jxr_linenumber" name="246" href="#246">246</a>                         dataRefresh,
-<a class="jxr_linenumber" name="247" href="#247">247</a>                         rebalancePipeline);
-<a class="jxr_linenumber" name="248" href="#248">248</a>       registry.register(<span class="jxr_string">"externalView"</span>, dataRefresh);
-<a class="jxr_linenumber" name="249" href="#249">249</a>       registry.register(<span class="jxr_string">"resume"</span>, dataRefresh, rebalancePipeline, externalViewPipeline);
-<a class="jxr_linenumber" name="250" href="#250">250</a>       registry.register(<span class="jxr_string">"periodicalRebalance"</span>, dataRefresh, rebalancePipeline, externalViewPipeline);
-<a class="jxr_linenumber" name="251" href="#251">251</a> 
-<a class="jxr_linenumber" name="252" href="#252">252</a>       <em class="jxr_comment">// health stats pipeline</em>
-<a class="jxr_linenumber" name="253" href="#253">253</a>       <em class="jxr_comment">// Pipeline healthStatsAggregationPipeline = new Pipeline();</em>
-<a class="jxr_linenumber" name="254" href="#254">254</a>       <em class="jxr_comment">// StatsAggregationStage statsStage = new StatsAggregationStage();</em>
-<a class="jxr_linenumber" name="255" href="#255">255</a>       <em class="jxr_comment">// healthStatsAggregationPipeline.addStage(new ReadHealthDataStage());</em>
-<a class="jxr_linenumber" name="256" href="#256">256</a>       <em class="jxr_comment">// healthStatsAggregationPipeline.addStage(statsStage);</em>
-<a class="jxr_linenumber" name="257" href="#257">257</a>       <em class="jxr_comment">// registry.register("healthChange", healthStatsAggregationPipeline);</em>
-<a class="jxr_linenumber" name="258" href="#258">258</a> 
-<a class="jxr_linenumber" name="259" href="#259">259</a>       <strong class="jxr_keyword">return</strong> registry;
-<a class="jxr_linenumber" name="260" href="#260">260</a>     }
-<a class="jxr_linenumber" name="261" href="#261">261</a>   }
-<a class="jxr_linenumber" name="262" href="#262">262</a> 
-<a class="jxr_linenumber" name="263" href="#263">263</a>   <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/helix/controller/GenericHelixController.html">GenericHelixController</a>(<a href="../../../../org/apache/helix/controller/pipeline/PipelineRegistry.html">PipelineRegistry</a> registry)
-<a class="jxr_linenumber" name="264" href="#264">264</a>   {
-<a class="jxr_linenumber" name="265" href="#265">265</a>     _paused = false;
-<a class="jxr_linenumber" name="266" href="#266">266</a>     _registry = registry;
-<a class="jxr_linenumber" name="267" href="#267">267</a>     _instanceCurrentStateChangeSubscriptionSessionIds =
-<a class="jxr_linenumber" name="268" href="#268">268</a>         <strong class="jxr_keyword">new</strong> ConcurrentSkipListSet&lt;String&gt;();
-<a class="jxr_linenumber" name="269" href="#269">269</a>     _instanceSubscriptionNames = <strong class="jxr_keyword">new</strong> ConcurrentSkipListSet&lt;String&gt;();
-<a class="jxr_linenumber" name="270" href="#270">270</a>     <em class="jxr_comment">// _externalViewGenerator = new ExternalViewGenerator();</em>
-<a class="jxr_linenumber" name="271" href="#271">271</a>   }
-<a class="jxr_linenumber" name="272" href="#272">272</a> 
-<a class="jxr_linenumber" name="273" href="#273">273</a>   <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="274" href="#274">274</a> <em class="jxr_javadoccomment">   * lock-always: caller always needs to obtain an external lock before call, calls to</em>
-<a class="jxr_linenumber" name="275" href="#275">275</a> <em class="jxr_javadoccomment">   * handleEvent() should be serialized</em>
-<a class="jxr_linenumber" name="276" href="#276">276</a> <em class="jxr_javadoccomment">   *</em>
-<a class="jxr_linenumber" name="277" href="#277">277</a> <em class="jxr_javadoccomment">   * @param event</em>
-<a class="jxr_linenumber" name="278" href="#278">278</a> <em class="jxr_javadoccomment">   */</em>
-<a class="jxr_linenumber" name="279" href="#279">279</a>   <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">synchronized</strong> <strong class="jxr_keyword">void</strong> handleEvent(<a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a> event)
-<a class="jxr_linenumber" name="280" href="#280">280</a>   {
-<a class="jxr_linenumber" name="281" href="#281">281</a>     <a href="../../../../org/apache/helix/HelixManager.html">HelixManager</a> manager = event.getAttribute(<span class="jxr_string">"helixmanager"</span>);
-<a class="jxr_linenumber" name="282" href="#282">282</a>     <strong class="jxr_keyword">if</strong> (manager == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="283" href="#283">283</a>     {
-<a class="jxr_linenumber" name="284" href="#284">284</a>       logger.error(<span class="jxr_string">"No cluster manager in event:"</span> + event.getName());
-<a class="jxr_linenumber" name="285" href="#285">285</a>       <strong class="jxr_keyword">return</strong>;
-<a class="jxr_linenumber" name="286" href="#286">286</a>     }
-<a class="jxr_linenumber" name="287" href="#287">287</a> 
-<a class="jxr_linenumber" name="288" href="#288">288</a>     <strong class="jxr_keyword">if</strong> (!manager.isLeader())
-<a class="jxr_linenumber" name="289" href="#289">289</a>     {
-<a class="jxr_linenumber" name="290" href="#290">290</a>       logger.error(<span class="jxr_string">"Cluster manager: "</span> + manager.getInstanceName()
-<a class="jxr_linenumber" name="291" href="#291">291</a>           + <span class="jxr_string">" is not leader. Pipeline will not be invoked"</span>);
-<a class="jxr_linenumber" name="292" href="#292">292</a>       <strong class="jxr_keyword">return</strong>;
-<a class="jxr_linenumber" name="293" href="#293">293</a>     }
-<a class="jxr_linenumber" name="294" href="#294">294</a> 
-<a class="jxr_linenumber" name="295" href="#295">295</a>     <strong class="jxr_keyword">if</strong> (_paused)
-<a class="jxr_linenumber" name="296" href="#296">296</a>     {
-<a class="jxr_linenumber" name="297" href="#297">297</a>       logger.info(<span class="jxr_string">"Cluster is paused. Ignoring the event:"</span> + event.getName());
-<a class="jxr_linenumber" name="298" href="#298">298</a>       <strong class="jxr_keyword">return</strong>;
-<a class="jxr_linenumber" name="299" href="#299">299</a>     }
-<a class="jxr_linenumber" name="300" href="#300">300</a> 
-<a class="jxr_linenumber" name="301" href="#301">301</a>     <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a> context = <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="302" href="#302">302</a>     <strong class="jxr_keyword">if</strong> (event.getAttribute(<span class="jxr_string">"changeContext"</span>) != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="303" href="#303">303</a>     {
-<a class="jxr_linenumber" name="304" href="#304">304</a>       context = (NotificationContext) (event.getAttribute(<span class="jxr_string">"changeContext"</span>));
-<a class="jxr_linenumber" name="305" href="#305">305</a>     }
-<a class="jxr_linenumber" name="306" href="#306">306</a> 
-<a class="jxr_linenumber" name="307" href="#307">307</a>     <em class="jxr_comment">// Initialize _clusterStatusMonitor</em>
-<a class="jxr_linenumber" name="308" href="#308">308</a>     <strong class="jxr_keyword">if</strong> (context != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="309" href="#309">309</a>     {
-<a class="jxr_linenumber" name="310" href="#310">310</a>       <strong class="jxr_keyword">if</strong> (context.getType() == Type.FINALIZE)
-<a class="jxr_linenumber" name="311" href="#311">311</a>       {
-<a class="jxr_linenumber" name="312" href="#312">312</a>         <strong class="jxr_keyword">if</strong> (_clusterStatusMonitor != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="313" href="#313">313</a>         {
-<a class="jxr_linenumber" name="314" href="#314">314</a>           _clusterStatusMonitor.reset();
-<a class="jxr_linenumber" name="315" href="#315">315</a>           _clusterStatusMonitor = <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="316" href="#316">316</a>         }
-<a class="jxr_linenumber" name="317" href="#317">317</a>         
-<a class="jxr_linenumber" name="318" href="#318">318</a>         stopRebalancingTimer();
-<a class="jxr_linenumber" name="319" href="#319">319</a>         logger.info(<span class="jxr_string">"Get FINALIZE notification, skip the pipeline. Event :"</span> + event.getName());
-<a class="jxr_linenumber" name="320" href="#320">320</a>         <strong class="jxr_keyword">return</strong>;
-<a class="jxr_linenumber" name="321" href="#321">321</a>       }
-<a class="jxr_linenumber" name="322" href="#322">322</a>       <strong class="jxr_keyword">else</strong>
-<a class="jxr_linenumber" name="323" href="#323">323</a>       {
-<a class="jxr_linenumber" name="324" href="#324">324</a>         <strong class="jxr_keyword">if</strong> (_clusterStatusMonitor == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="325" href="#325">325</a>         {
-<a class="jxr_linenumber" name="326" href="#326">326</a>           _clusterStatusMonitor = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/monitoring/mbeans/ClusterStatusMonitor.html">ClusterStatusMonitor</a>(manager.getClusterName());
-<a class="jxr_linenumber" name="327" href="#327">327</a>         }
-<a class="jxr_linenumber" name="328" href="#328">328</a>         
-<a class="jxr_linenumber" name="329" href="#329">329</a>         event.addAttribute(<span class="jxr_string">"clusterStatusMonitor"</span>, _clusterStatusMonitor);
-<a class="jxr_linenumber" name="330" href="#330">330</a>       }
-<a class="jxr_linenumber" name="331" href="#331">331</a>     }
-<a class="jxr_linenumber" name="332" href="#332">332</a> 
-<a class="jxr_linenumber" name="333" href="#333">333</a>     List&lt;Pipeline&gt; pipelines = _registry.getPipelinesForEvent(event.getName());
-<a class="jxr_linenumber" name="334" href="#334">334</a>     <strong class="jxr_keyword">if</strong> (pipelines == <strong class="jxr_keyword">null</strong> || pipelines.size() == 0)
-<a class="jxr_linenumber" name="335" href="#335">335</a>     {
-<a class="jxr_linenumber" name="336" href="#336">336</a>       logger.info(<span class="jxr_string">"No pipeline to run for event:"</span> + event.getName());
-<a class="jxr_linenumber" name="337" href="#337">337</a>       <strong class="jxr_keyword">return</strong>;
-<a class="jxr_linenumber" name="338" href="#338">338</a>     }
-<a class="jxr_linenumber" name="339" href="#339">339</a> 
-<a class="jxr_linenumber" name="340" href="#340">340</a>     <strong class="jxr_keyword">for</strong> (Pipeline pipeline : pipelines)
-<a class="jxr_linenumber" name="341" href="#341">341</a>     {
-<a class="jxr_linenumber" name="342" href="#342">342</a>       <strong class="jxr_keyword">try</strong>
-<a class="jxr_linenumber" name="343" href="#343">343</a>       {
-<a class="jxr_linenumber" name="344" href="#344">344</a>         pipeline.handle(event);
-<a class="jxr_linenumber" name="345" href="#345">345</a>         pipeline.finish();
-<a class="jxr_linenumber" name="346" href="#346">346</a>       }
-<a class="jxr_linenumber" name="347" href="#347">347</a>       <strong class="jxr_keyword">catch</strong> (Exception e)
-<a class="jxr_linenumber" name="348" href="#348">348</a>       {
-<a class="jxr_linenumber" name="349" href="#349">349</a>         logger.error(<span class="jxr_string">"Exception while executing pipeline: "</span> + pipeline
-<a class="jxr_linenumber" name="350" href="#350">350</a>             + <span class="jxr_string">". Will not continue to next pipeline"</span>, e);
-<a class="jxr_linenumber" name="351" href="#351">351</a>         <strong class="jxr_keyword">break</strong>;
-<a class="jxr_linenumber" name="352" href="#352">352</a>       }
-<a class="jxr_linenumber" name="353" href="#353">353</a>     }
-<a class="jxr_linenumber" name="354" href="#354">354</a>   }
-<a class="jxr_linenumber" name="355" href="#355">355</a> 
-<a class="jxr_linenumber" name="356" href="#356">356</a>   <em class="jxr_comment">// TODO since we read data in pipeline, we can get rid of reading from zookeeper in</em>
-<a class="jxr_linenumber" name="357" href="#357">357</a>   <em class="jxr_comment">// callback</em>
-<a class="jxr_linenumber" name="358" href="#358">358</a> 
-<a class="jxr_linenumber" name="359" href="#359">359</a>   @Override
-<a class="jxr_linenumber" name="360" href="#360">360</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onExternalViewChange(List&lt;ExternalView&gt; externalViewList,
-<a class="jxr_linenumber" name="361" href="#361">361</a>                                    <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a> changeContext)
-<a class="jxr_linenumber" name="362" href="#362">362</a>   {
-<a class="jxr_linenumber" name="363" href="#363">363</a> <em class="jxr_comment">//    logger.info("START: GenericClusterController.onExternalViewChange()");</em>
-<a class="jxr_linenumber" name="364" href="#364">364</a> <em class="jxr_comment">//    ClusterEvent event = new ClusterEvent("externalViewChange");</em>
-<a class="jxr_linenumber" name="365" href="#365">365</a> <em class="jxr_comment">//    event.addAttribute("helixmanager", changeContext.getManager());</em>
-<a class="jxr_linenumber" name="366" href="#366">366</a> <em class="jxr_comment">//    event.addAttribute("changeContext", changeContext);</em>
-<a class="jxr_linenumber" name="367" href="#367">367</a> <em class="jxr_comment">//    event.addAttribute("eventData", externalViewList);</em>
-<a class="jxr_linenumber" name="368" href="#368">368</a> <em class="jxr_comment">//    // handleEvent(event);</em>
-<a class="jxr_linenumber" name="369" href="#369">369</a> <em class="jxr_comment">//    logger.info("END: GenericClusterController.onExternalViewChange()");</em>
-<a class="jxr_linenumber" name="370" href="#370">370</a>   }
-<a class="jxr_linenumber" name="371" href="#371">371</a> 
-<a class="jxr_linenumber" name="372" href="#372">372</a>   @Override
-<a class="jxr_linenumber" name="373" href="#373">373</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onStateChange(String instanceName,
-<a class="jxr_linenumber" name="374" href="#374">374</a>                             List&lt;CurrentState&gt; statesInfo,
-<a class="jxr_linenumber" name="375" href="#375">375</a>                             <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a> changeContext)
-<a class="jxr_linenumber" name="376" href="#376">376</a>   {
-<a class="jxr_linenumber" name="377" href="#377">377</a>     logger.info(<span class="jxr_string">"START: GenericClusterController.onStateChange()"</span>);
-<a class="jxr_linenumber" name="378" href="#378">378</a>     <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a> event = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a>(<span class="jxr_string">"currentStateChange"</span>);
-<a class="jxr_linenumber" name="379" href="#379">379</a>     event.addAttribute(<span class="jxr_string">"helixmanager"</span>, changeContext.getManager());
-<a class="jxr_linenumber" name="380" href="#380">380</a>     event.addAttribute(<span class="jxr_string">"instanceName"</span>, instanceName);
-<a class="jxr_linenumber" name="381" href="#381">381</a>     event.addAttribute(<span class="jxr_string">"changeContext"</span>, changeContext);
-<a class="jxr_linenumber" name="382" href="#382">382</a>     event.addAttribute(<span class="jxr_string">"eventData"</span>, statesInfo);
-<a class="jxr_linenumber" name="383" href="#383">383</a>     handleEvent(event);
-<a class="jxr_linenumber" name="384" href="#384">384</a>     logger.info(<span class="jxr_string">"END: GenericClusterController.onStateChange()"</span>);
-<a class="jxr_linenumber" name="385" href="#385">385</a>   }
-<a class="jxr_linenumber" name="386" href="#386">386</a> 
-<a class="jxr_linenumber" name="387" href="#387">387</a>   @Override
-<a class="jxr_linenumber" name="388" href="#388">388</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onHealthChange(String instanceName,
-<a class="jxr_linenumber" name="389" href="#389">389</a>                              List&lt;HealthStat&gt; reports,
-<a class="jxr_linenumber" name="390" href="#390">390</a>                              <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a> changeContext)
-<a class="jxr_linenumber" name="391" href="#391">391</a>   {
-<a class="jxr_linenumber" name="392" href="#392">392</a>     <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="393" href="#393">393</a> <em class="jxr_javadoccomment">     * When there are more participant ( &gt; 20, can be in hundreds), This callback can be</em>
-<a class="jxr_linenumber" name="394" href="#394">394</a> <em class="jxr_javadoccomment">     * called quite frequently as each participant reports health stat every minute. Thus</em>
-<a class="jxr_linenumber" name="395" href="#395">395</a> <em class="jxr_javadoccomment">     * we change the health check pipeline to run in a timer callback.</em>
-<a class="jxr_linenumber" name="396" href="#396">396</a> <em class="jxr_javadoccomment">     */</em>
-<a class="jxr_linenumber" name="397" href="#397">397</a>   }
-<a class="jxr_linenumber" name="398" href="#398">398</a> 
-<a class="jxr_linenumber" name="399" href="#399">399</a>   @Override
-<a class="jxr_linenumber" name="400" href="#400">400</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onMessage(String instanceName,
-<a class="jxr_linenumber" name="401" href="#401">401</a>                         List&lt;Message&gt; messages,
-<a class="jxr_linenumber" name="402" href="#402">402</a>                         <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a> changeContext)
-<a class="jxr_linenumber" name="403" href="#403">403</a>   {
-<a class="jxr_linenumber" name="404" href="#404">404</a>     logger.info(<span class="jxr_string">"START: GenericClusterController.onMessage()"</span>);
-<a class="jxr_linenumber" name="405" href="#405">405</a>     
-<a class="jxr_linenumber" name="406" href="#406">406</a>     <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a> event = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a>(<span class="jxr_string">"messageChange"</span>);
-<a class="jxr_linenumber" name="407" href="#407">407</a>     event.addAttribute(<span class="jxr_string">"helixmanager"</span>, changeContext.getManager());
-<a class="jxr_linenumber" name="408" href="#408">408</a>     event.addAttribute(<span class="jxr_string">"instanceName"</span>, instanceName);
-<a class="jxr_linenumber" name="409" href="#409">409</a>     event.addAttribute(<span class="jxr_string">"changeContext"</span>, changeContext);
-<a class="jxr_linenumber" name="410" href="#410">410</a>     event.addAttribute(<span class="jxr_string">"eventData"</span>, messages);
-<a class="jxr_linenumber" name="411" href="#411">411</a>     handleEvent(event);
-<a class="jxr_linenumber" name="412" href="#412">412</a>     
-<a class="jxr_linenumber" name="413" href="#413">413</a>     <strong class="jxr_keyword">if</strong> (_clusterStatusMonitor != <strong class="jxr_keyword">null</strong> &amp;&amp; messages != <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="414" href="#414">414</a>     {
-<a class="jxr_linenumber" name="415" href="#415">415</a>       _clusterStatusMonitor.addMessageQueueSize(instanceName, messages.size());
-<a class="jxr_linenumber" name="416" href="#416">416</a>     }
-<a class="jxr_linenumber" name="417" href="#417">417</a>         
-<a class="jxr_linenumber" name="418" href="#418">418</a>     logger.info(<span class="jxr_string">"END: GenericClusterController.onMessage()"</span>);
-<a class="jxr_linenumber" name="419" href="#419">419</a>   }
-<a class="jxr_linenumber" name="420" href="#420">420</a> 
-<a class="jxr_linenumber" name="421" href="#421">421</a>   @Override
-<a class="jxr_linenumber" name="422" href="#422">422</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onLiveInstanceChange(List&lt;LiveInstance&gt; liveInstances,
-<a class="jxr_linenumber" name="423" href="#423">423</a>                                    <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a> changeContext)
-<a class="jxr_linenumber" name="424" href="#424">424</a>   {
-<a class="jxr_linenumber" name="425" href="#425">425</a>     logger.info(<span class="jxr_string">"START: Generic GenericClusterController.onLiveInstanceChange()"</span>);
-<a class="jxr_linenumber" name="426" href="#426">426</a>     <strong class="jxr_keyword">if</strong> (liveInstances == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="427" href="#427">427</a>     {
-<a class="jxr_linenumber" name="428" href="#428">428</a>       liveInstances = Collections.emptyList();
-<a class="jxr_linenumber" name="429" href="#429">429</a>     }
-<a class="jxr_linenumber" name="430" href="#430">430</a>     <em class="jxr_comment">// Go though the live instance list and make sure that we are observing them</em>
-<a class="jxr_linenumber" name="431" href="#431">431</a>     <em class="jxr_comment">// accordingly. The action is done regardless of the paused flag.</em>
-<a class="jxr_linenumber" name="432" href="#432">432</a>     <strong class="jxr_keyword">if</strong> (changeContext.getType() == NotificationContext.Type.INIT ||
-<a class="jxr_linenumber" name="433" href="#433">433</a>         changeContext.getType() == NotificationContext.Type.CALLBACK)
-<a class="jxr_linenumber" name="434" href="#434">434</a>     {
-<a class="jxr_linenumber" name="435" href="#435">435</a>       checkLiveInstancesObservation(liveInstances, changeContext);
-<a class="jxr_linenumber" name="436" href="#436">436</a>     }
-<a class="jxr_linenumber" name="437" href="#437">437</a> 
-<a class="jxr_linenumber" name="438" href="#438">438</a>     <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a> event = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a>(<span class="jxr_string">"liveInstanceChange"</span>);
-<a class="jxr_linenumber" name="439" href="#439">439</a>     event.addAttribute(<span class="jxr_string">"helixmanager"</span>, changeContext.getManager());
-<a class="jxr_linenumber" name="440" href="#440">440</a>     event.addAttribute(<span class="jxr_string">"changeContext"</span>, changeContext);
-<a class="jxr_linenumber" name="441" href="#441">441</a>     event.addAttribute(<span class="jxr_string">"eventData"</span>, liveInstances);
-<a class="jxr_linenumber" name="442" href="#442">442</a>     handleEvent(event);
-<a class="jxr_linenumber" name="443" href="#443">443</a>     logger.info(<span class="jxr_string">"END: Generic GenericClusterController.onLiveInstanceChange()"</span>);
-<a class="jxr_linenumber" name="444" href="#444">444</a>   }
-<a class="jxr_linenumber" name="445" href="#445">445</a>   
-<a class="jxr_linenumber" name="446" href="#446">446</a>   <strong class="jxr_keyword">void</strong> checkRebalancingTimer(<a href="../../../../org/apache/helix/HelixManager.html">HelixManager</a> manager, List&lt;IdealState&gt; idealStates)
-<a class="jxr_linenumber" name="447" href="#447">447</a>   {
-<a class="jxr_linenumber" name="448" href="#448">448</a>     <strong class="jxr_keyword">if</strong> (manager.getConfigAccessor() == <strong class="jxr_keyword">null</strong>)
-<a class="jxr_linenumber" name="449" href="#449">449</a>     {
-<a class="jxr_linenumber" name="450" href="#450">450</a>       logger.warn(manager.getInstanceName() + <span class="jxr_string">" config accessor doesn't exist. should be in file-based mode."</span>);
-<a class="jxr_linenumber" name="451" href="#451">451</a>       <strong class="jxr_keyword">return</strong>;
-<a class="jxr_linenumber" name="452" href="#452">452</a>     }
-<a class="jxr_linenumber" name="453" href="#453">453</a>     
-<a class="jxr_linenumber" name="454" href="#454">454</a>     <strong class="jxr_keyword">for</strong>(<a href="../../../../org/apache/helix/model/IdealState.html">IdealState</a> idealState : idealStates)
-<a class="jxr_linenumber" name="455" href="#455">455</a>     {
-<a class="jxr_linenumber" name="456" href="#456">456</a>       <strong class="jxr_keyword">int</strong> period = idealState.getRebalanceTimerPeriod();
-<a class="jxr_linenumber" name="457" href="#457">457</a>       <strong class="jxr_keyword">if</strong>(period &gt; 0)
-<a class="jxr_linenumber" name="458" href="#458">458</a>       {
-<a class="jxr_linenumber" name="459" href="#459">459</a>         startRebalancingTimer(period, manager);
-<a class="jxr_linenumber" name="460" href="#460">460</a>       }
-<a class="jxr_linenumber" name="461" href="#461">461</a>     }
-<a class="jxr_linenumber" name="462" href="#462">462</a>   }
-<a class="jxr_linenumber" name="463" href="#463">463</a>   
-<a class="jxr_linenumber" name="464" href="#464">464</a>   @Override
-<a class="jxr_linenumber" name="465" href="#465">465</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onIdealStateChange(List&lt;IdealState&gt; idealStates,
-<a class="jxr_linenumber" name="466" href="#466">466</a>                                  <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a> changeContext)
-<a class="jxr_linenumber" name="467" href="#467">467</a>   {
-<a class="jxr_linenumber" name="468" href="#468">468</a>     logger.info(<span class="jxr_string">"START: Generic GenericClusterController.onIdealStateChange()"</span>);
-<a class="jxr_linenumber" name="469" href="#469">469</a>     <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a> event = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a>(<span class="jxr_string">"idealStateChange"</span>);
-<a class="jxr_linenumber" name="470" href="#470">470</a>     event.addAttribute(<span class="jxr_string">"helixmanager"</span>, changeContext.getManager());
-<a class="jxr_linenumber" name="471" href="#471">471</a>     event.addAttribute(<span class="jxr_string">"changeContext"</span>, changeContext);
-<a class="jxr_linenumber" name="472" href="#472">472</a>     event.addAttribute(<span class="jxr_string">"eventData"</span>, idealStates);
-<a class="jxr_linenumber" name="473" href="#473">473</a>     handleEvent(event);
-<a class="jxr_linenumber" name="474" href="#474">474</a>     
-<a class="jxr_linenumber" name="475" href="#475">475</a>     <strong class="jxr_keyword">if</strong>(changeContext.getType() != Type.FINALIZE)
-<a class="jxr_linenumber" name="476" href="#476">476</a>     {
-<a class="jxr_linenumber" name="477" href="#477">477</a>       checkRebalancingTimer(changeContext.getManager(), idealStates);
-<a class="jxr_linenumber" name="478" href="#478">478</a>     }
-<a class="jxr_linenumber" name="479" href="#479">479</a>     
-<a class="jxr_linenumber" name="480" href="#480">480</a>     logger.info(<span class="jxr_string">"END: Generic GenericClusterController.onIdealStateChange()"</span>);
-<a class="jxr_linenumber" name="481" href="#481">481</a>   }
-<a class="jxr_linenumber" name="482" href="#482">482</a> 
-<a class="jxr_linenumber" name="483" href="#483">483</a>   @Override
-<a class="jxr_linenumber" name="484" href="#484">484</a>   <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onConfigChange(List&lt;InstanceConfig&gt; configs,
-<a class="jxr_linenumber" name="485" href="#485">485</a>                              <a href="../../../../org/apache/helix/NotificationContext.html">NotificationContext</a> changeContext)
-<a class="jxr_linenumber" name="486" href="#486">486</a>   {
-<a class="jxr_linenumber" name="487" href="#487">487</a>     logger.info(<span class="jxr_string">"START: GenericClusterController.onConfigChange()"</span>);
-<a class="jxr_linenumber" name="488" href="#488">488</a>     <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a> event = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/helix/controller/stages/ClusterEvent.html">ClusterEvent</a>(<span class="jxr_string">"configChange"</span>);
-<a class="jxr_linenumber" name="489" href="#489">489</a>     event.addAttribute(<span class="jxr_string">"changeContext"</span>, changeContext);
-<a class="jxr_linenumber" name="490" href="#490">490</a>     event.addAttribute(<span class="jxr_string">"helixmanager"</span>, changeContext.getManager());
-<a class="jxr_linenumber" name="491" href="#491">491</a>     event.addAttribute(<span class="jxr_string">"eventData"</span>, configs);
-<a class="jxr_linenumber" name="492" href="#492">492</a>     handleEvent(event);

[... 515 lines stripped ...]


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