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From Apache Wiki <>
Subject [Cassandra Wiki] Update of "OpenNMS" by EricEvans
Date Thu, 27 Aug 2009 22:11:18 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.

The following page has been changed by EricEvans:

The comment on the change is:
stubbed out

New page:
= Cluster Monitoring and Management w/ OpenNMS =

== Introduction ==
We can break cluster/network management down into a couple of areas:

 1. Real-time monitoring of service availability.
 2. Collection and trending of data to better understand cluster performance.

For (1), we're looking at things like ''"Are my nodes up? Do they respond
to an ICMP ping?"'', or ''"Is the thrift service listening? Is it capable
of responding to RPC requests?"''. 

With (2) we're interested in collecting and reporting on data that will
help us answer questions like, ''"What is the rate of storage consumption?
When will I need to add capacity?"'' or ''"At what point does load start to
adversely effect read/write latency?"''

[ OpenNMS] is a Free Software (GPL) network management
platform written in Java. This page will document configuration and best
practices when using OpenNMS for monitoring, data-collection, and
management of Cassandra clusters.

''Note: It is beyond the scope of this document to detail anything already
covered in the [ actual docs].''

''Disclaimer: This page is a very early draft. No claims are made with
respect to accuracy or completeness. Reading this might very well make you
dumber. You have been warned.''

== Service Polling ==

== Data Collection ==
=== Capability Detection ===
If you are using the Cassandra default of 8080 for JMX, then you'll need to 
comment out the definition for HTTP-8080 (it conflicts).

File: capsd-configuration.xml
<protocol-plugin protocol="JSR160-8080" scan="on" user-defined="false"
    <property key="port" value="8080"/>
    <property key="type" value="default"/>

=== Collection ===
File: jmx-datacollection-config.xml

<jmx-collection name="JSR160-8080" maxVarsPerPdu = "50">
    <rrd step = "300">

        <mbean name="cf.keyspace1.standard1"
            <attrib alias="ReadLatency" type="gauge" name="ReadLatency"/>
            <attrib alias="WriteLatency" type="gauge" name="WriteLatency"/>
            <attrib alias="PendingTasks" type="gauge" name="PendingTasks"/>
            <attrib alias="ReadCount" type="gauge" name="ReadCount"/>
            <attrib alias="WriteCount" type="gauge" name="WriteCount"/>
            <attrib alias="MemtableSwitchCount" type="gauge"
            <attrib alias="MemtableColumnCount" type="gauge"
            <attrib alias="MemtableDataSize" type="gauge"

File: collectd-configuration.xml

<service name="JSR160-8080" interval="300000" user-defined="false"
    <parameter key="port" value="8080"/>
    <parameter key="protocol" value="rmi"/>
    <parameter key="urlPath" value="/jmxrmi"/>
    <parameter key="collection" value="JSR160-8080"/>
    <parameter key="friendly-name" value="JSR160-8080"/>

<collector service="JSR160-8080"


=== Reports/Graphs ===

{{{ Latency,WriteLatency"Read/write Latency" \
 DEF:readlatency={rrd1}:ReadLatency:AVERAGE \
 DEF:minReadlatency={rrd1}:ReadLatency:MIN \
 DEF:maxReadlatency={rrd1}:ReadLatency:MAX \
 DEF:writelatency={rrd2}:WriteLatency:AVERAGE \
 DEF:minWritelatency={rrd2}:WriteLatency:MIN \
 DEF:maxWritelatency={rrd2}:WriteLatency:MAX \
 LINE2:readlatency#0000ff:"Read latency" \
 GPRINT:readlatency:AVERAGE:"  Avg  \\: %5.2lf %s" \
 GPRINT:minReadlatency:MIN:"Min  \\: %5.2lf %s" \
 GPRINT:maxReadlatency:MAX:"Max  \\: %5.2lf %s\\n" \
 LINE2:writelatency#00ff00:"Write latency" \
 GPRINT:writelatency:AVERAGE:" Avg  \\: %5.2lf %s" \
 GPRINT:minWritelatency:MIN:"Min  \\: %5.2lf %s" \
 GPRINT:maxWritelatency:MAX:"Max  \\: %5.2lf %s\\n"

reports=mib2.HCbits, mib2.bits, mib2.percentdiscards, mib2.percenterrors, \
mib2.discards, mib2.errors, mib2.packets, \
xmp.procs,xmp.filesys,xmp.xmpdstats,xmp.diskstats,xmp.diskkb, \

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