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From "Timothy Potter (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-7338) A reloaded core will never register itself as active after a ZK session expiration
Date Wed, 01 Apr 2015 17:36:53 GMT
Timothy Potter created SOLR-7338:
------------------------------------

             Summary: A reloaded core will never register itself as active after a ZK session
expiration
                 Key: SOLR-7338
                 URL: https://issues.apache.org/jira/browse/SOLR-7338
             Project: Solr
          Issue Type: Bug
          Components: SolrCloud
            Reporter: Timothy Potter
            Assignee: Timothy Potter


If a collection gets reloaded, then a core's isReloaded flag is always true. If a core experiences
a ZK session expiration after a reload, then it won't ever be able to set itself to active
because of the check in {{ZkController#register}}:

{code}
        UpdateLog ulog = core.getUpdateHandler().getUpdateLog();
        if (!core.isReloaded() && ulog != null) {
          // disable recovery in case shard is in construction state (for shard splits)
          Slice slice = getClusterState().getSlice(collection, shardId);
          if (slice.getState() != Slice.State.CONSTRUCTION || !isLeader) {
            Future<UpdateLog.RecoveryInfo> recoveryFuture = core.getUpdateHandler().getUpdateLog().recoverFromLog();
            if (recoveryFuture != null) {
              log.info("Replaying tlog for " + ourUrl + " during startup... NOTE: This can
take a while.");
              recoveryFuture.get(); // NOTE: this could potentially block for
              // minutes or more!
              // TODO: public as recovering in the mean time?
              // TODO: in the future we could do peersync in parallel with recoverFromLog
            } else {
              log.info("No LogReplay needed for core=" + core.getName() + " baseURL=" + baseUrl);
            }
          }
          boolean didRecovery = checkRecovery(coreName, desc, recoverReloadedCores, isLeader,
cloudDesc,
              collection, coreZkNodeName, shardId, leaderProps, core, cc);
          if (!didRecovery) {
            publish(desc, ZkStateReader.ACTIVE);
          }
        }
{code}

I can easily simulate this on trunk by doing:

{code}
bin/solr -c -z localhost:2181
bin/solr create -c foo
bin/post -c foo example/exampledocs/*.xml
curl "http://localhost:8983/solr/admin/collections?action=RELOAD&name=foo"
kill -STOP <PID> && sleep <PAUSE_SECONDS> && kill -CONT <PID>
{code}

Where <PID> is the process ID of the Solr node. Here are the logs after the CONT command.
As you can see below, the core never gets to setting itself as active again. I think the bug
is that the isReloaded flag needs to get set back to false once the reload is successful,
but I don't understand what this flag is needed for anyway???

{code}
INFO  - 2015-04-01 17:28:50.962; org.apache.solr.common.cloud.ConnectionManager; Watcher org.apache.solr.common.cloud.ConnectionManager@5519dba0
name:ZooKeeperConnection Watcher:localhost:2181 got event WatchedEvent state:Disconnected
type:None path:null path:null type:None
INFO  - 2015-04-01 17:28:50.963; org.apache.solr.common.cloud.ConnectionManager; zkClient
has disconnected
INFO  - 2015-04-01 17:28:51.107; org.apache.solr.common.cloud.ConnectionManager; Watcher org.apache.solr.common.cloud.ConnectionManager@5519dba0
name:ZooKeeperConnection Watcher:localhost:2181 got event WatchedEvent state:Expired type:None
path:null path:null type:None
INFO  - 2015-04-01 17:28:51.107; org.apache.solr.common.cloud.ConnectionManager; Our previous
ZooKeeper session was expired. Attempting to reconnect to recover relationship with ZooKeeper...
INFO  - 2015-04-01 17:28:51.108; org.apache.solr.cloud.Overseer; Overseer (id=93579450724974592-192.168.1.2:8983_solr-n_0000000000)
closing
INFO  - 2015-04-01 17:28:51.108; org.apache.solr.cloud.ZkController$WatcherImpl; A node got
unwatched for /configs/foo
INFO  - 2015-04-01 17:28:51.108; org.apache.solr.cloud.Overseer$ClusterStateUpdater; Overseer
Loop exiting : 192.168.1.2:8983_solr
INFO  - 2015-04-01 17:28:51.109; org.apache.solr.cloud.OverseerCollectionProcessor; According
to ZK I (id=93579450724974592-192.168.1.2:8983_solr-n_0000000000) am no longer a leader.
INFO  - 2015-04-01 17:28:51.108; org.apache.solr.cloud.ZkController$4; Running listeners for
/configs/foo
INFO  - 2015-04-01 17:28:51.109; org.apache.solr.common.cloud.DefaultConnectionStrategy; Connection
expired - starting a new one...
INFO  - 2015-04-01 17:28:51.109; org.apache.solr.core.SolrCore$11; config update listener
called for core foo_shard1_replica1
INFO  - 2015-04-01 17:28:51.110; org.apache.solr.common.cloud.ConnectionManager; Waiting for
client to connect to ZooKeeper
ERROR - 2015-04-01 17:28:51.110; org.apache.solr.common.SolrException; OverseerAutoReplicaFailoverThread
had an error in its thread work loop.:org.apache.solr.common.SolrException: Error reading
cluster properties
	at org.apache.solr.common.cloud.ZkStateReader.getClusterProps(ZkStateReader.java:772)
	at org.apache.solr.cloud.OverseerAutoReplicaFailoverThread.doWork(OverseerAutoReplicaFailoverThread.java:150)
	at org.apache.solr.cloud.OverseerAutoReplicaFailoverThread.run(OverseerAutoReplicaFailoverThread.java:129)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.InterruptedException: sleep interrupted
	at java.lang.Thread.sleep(Native Method)
	at org.apache.solr.common.cloud.ZkCmdExecutor.retryDelay(ZkCmdExecutor.java:108)
	at org.apache.solr.common.cloud.ZkCmdExecutor.retryOperation(ZkCmdExecutor.java:76)
	at org.apache.solr.common.cloud.SolrZkClient.exists(SolrZkClient.java:308)
	at org.apache.solr.common.cloud.ZkStateReader.getClusterProps(ZkStateReader.java:765)
	... 3 more

WARN  - 2015-04-01 17:28:51.110; org.apache.solr.cloud.ZkController$4; listener throws error
org.apache.solr.common.SolrException: org.apache.zookeeper.KeeperException$SessionExpiredException:
KeeperErrorCode = Session expired for /configs/foo/params.json
	at org.apache.solr.core.RequestParams.getFreshRequestParams(RequestParams.java:160)
	at org.apache.solr.core.SolrConfig.refreshRequestParams(SolrConfig.java:907)
	at org.apache.solr.core.SolrCore$11.run(SolrCore.java:2503)
	at org.apache.solr.cloud.ZkController$4.run(ZkController.java:2351)
Caused by: org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode =
Session expired for /configs/foo/params.json
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:127)
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
	at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1045)
	at org.apache.solr.common.cloud.SolrZkClient$4.execute(SolrZkClient.java:294)
	at org.apache.solr.common.cloud.SolrZkClient$4.execute(SolrZkClient.java:291)
	at org.apache.solr.common.cloud.ZkCmdExecutor.retryOperation(ZkCmdExecutor.java:61)
	at org.apache.solr.common.cloud.SolrZkClient.exists(SolrZkClient.java:291)
	at org.apache.solr.core.RequestParams.getFreshRequestParams(RequestParams.java:150)
	... 3 more
ERROR - 2015-04-01 17:28:51.110; org.apache.solr.cloud.Overseer$ClusterStateUpdater; could
not read the data
org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode = Session expired
for /overseer_elect/leader
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:127)
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
	at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1155)
	at org.apache.solr.common.cloud.SolrZkClient$7.execute(SolrZkClient.java:345)
	at org.apache.solr.common.cloud.SolrZkClient$7.execute(SolrZkClient.java:342)
	at org.apache.solr.common.cloud.ZkCmdExecutor.retryOperation(ZkCmdExecutor.java:61)
	at org.apache.solr.common.cloud.SolrZkClient.getData(SolrZkClient.java:342)
	at org.apache.solr.cloud.Overseer$ClusterStateUpdater.checkIfIamStillLeader(Overseer.java:298)
	at org.apache.solr.cloud.Overseer$ClusterStateUpdater.access$300(Overseer.java:83)
	at org.apache.solr.cloud.Overseer$ClusterStateUpdater$2.run(Overseer.java:259)
INFO  - 2015-04-01 17:28:51.114; org.apache.solr.common.cloud.ConnectionManager; Watcher org.apache.solr.common.cloud.ConnectionManager@5519dba0
name:ZooKeeperConnection Watcher:localhost:2181 got event WatchedEvent state:SyncConnected
type:None path:null path:null type:None
INFO  - 2015-04-01 17:28:51.115; org.apache.solr.common.cloud.ConnectionManager; Client is
connected to ZooKeeper
INFO  - 2015-04-01 17:28:51.115; org.apache.solr.common.cloud.ConnectionManager$1; Connection
with ZooKeeper reestablished.
INFO  - 2015-04-01 17:28:51.115; org.apache.solr.cloud.ZkController$1; ZooKeeper session re-connected
... refreshing core states after session expiration.
INFO  - 2015-04-01 17:28:51.115; org.apache.solr.cloud.ZkController; publishing core=foo_shard1_replica1
state=down collection=foo
INFO  - 2015-04-01 17:28:51.118; org.apache.solr.cloud.ElectionContext; canceling election
/overseer_elect/election/93579450724974592-192.168.1.2:8983_solr-n_0000000000
WARN  - 2015-04-01 17:28:51.119; org.apache.solr.cloud.ElectionContext; cancelElection did
not find election node to remove /overseer_elect/election/93579450724974592-192.168.1.2:8983_solr-n_0000000000
INFO  - 2015-04-01 17:28:51.121; org.apache.solr.cloud.OverseerElectionContext; I am going
to be the leader 192.168.1.2:8983_solr
INFO  - 2015-04-01 17:28:51.121; org.apache.solr.common.cloud.SolrZkClient; makePath: /overseer_elect/leader
INFO  - 2015-04-01 17:28:51.122; org.apache.solr.cloud.Overseer; Overseer (id=93579450724974594-192.168.1.2:8983_solr-n_0000000001)
starting
INFO  - 2015-04-01 17:28:51.128; org.apache.solr.cloud.OverseerAutoReplicaFailoverThread;
Starting OverseerAutoReplicaFailoverThread autoReplicaFailoverWorkLoopDelay=10000 autoReplicaFailoverWaitAfterExpiration=30000
autoReplicaFailoverBadNodeExpiration=60000
INFO  - 2015-04-01 17:28:51.128; org.apache.solr.cloud.OverseerCollectionProcessor; Process
current queue of collection creations
INFO  - 2015-04-01 17:28:51.128; org.apache.solr.common.cloud.ZkStateReader; Updating cluster
state from ZooKeeper... 
INFO  - 2015-04-01 17:28:51.129; org.apache.solr.cloud.Overseer$ClusterStateUpdater; Starting
to work on the main queue
INFO  - 2015-04-01 17:28:51.130; org.apache.solr.common.cloud.ZkStateReader; addZkWatch foo
INFO  - 2015-04-01 17:28:51.131; org.apache.solr.common.cloud.ZkStateReader; Updating collection
state at /collections/foo/state.json from ZooKeeper... 
INFO  - 2015-04-01 17:28:51.131; org.apache.solr.common.cloud.ZkStateReader; Updating data
for foo to ver 4 
INFO  - 2015-04-01 17:28:51.131; org.apache.solr.cloud.ZkController; Register node as live
in ZooKeeper:/live_nodes/192.168.1.2:8983_solr
INFO  - 2015-04-01 17:28:51.132; org.apache.solr.common.cloud.SolrZkClient; makePath: /live_nodes/192.168.1.2:8983_solr
INFO  - 2015-04-01 17:28:51.133; org.apache.solr.cloud.ZkController; Register replica - core:foo_shard1_replica1
address:http://192.168.1.2:8983/solr collection:foo shard:shard1
INFO  - 2015-04-01 17:28:51.133; org.apache.solr.common.cloud.ZkStateReader; Updating data
for foo to ver 4 
INFO  - 2015-04-01 17:28:51.133; org.apache.solr.cloud.ElectionContext; canceling election
/collections/foo/leader_elect/shard1/election/93579450724974592-core_node1-n_0000000000
WARN  - 2015-04-01 17:28:51.134; org.apache.solr.cloud.ElectionContext; cancelElection did
not find election node to remove /collections/foo/leader_elect/shard1/election/93579450724974592-core_node1-n_0000000000
INFO  - 2015-04-01 17:28:51.134; org.apache.solr.cloud.Overseer$ClusterStateUpdater; processMessage:
queueSize: 1, message = {
  "core":"foo_shard1_replica1",
  "core_node_name":"core_node1",
  "roles":null,
  "base_url":"http://192.168.1.2:8983/solr",
  "node_name":"192.168.1.2:8983_solr",
  "numShards":"1",
  "state":"down",
  "shard":"shard1",
  "collection":"foo",
  "operation":"state"} current state version: 1
INFO  - 2015-04-01 17:28:51.135; org.apache.solr.cloud.overseer.ReplicaMutator; Update state
numShards=1 message={
  "core":"foo_shard1_replica1",
  "core_node_name":"core_node1",
  "roles":null,
  "base_url":"http://192.168.1.2:8983/solr",
  "node_name":"192.168.1.2:8983_solr",
  "numShards":"1",
  "state":"down",
  "shard":"shard1",
  "collection":"foo",
  "operation":"state"}
INFO  - 2015-04-01 17:28:51.136; org.apache.solr.cloud.ShardLeaderElectionContext; Running
the leader process for shard shard1
INFO  - 2015-04-01 17:28:51.136; org.apache.solr.cloud.overseer.ZkStateWriter; going to update_collection
/collections/foo/state.json version: 4
INFO  - 2015-04-01 17:28:51.136; org.apache.solr.cloud.ActionThrottle; The last leader attempt
started 198060ms ago.
INFO  - 2015-04-01 17:28:51.137; org.apache.solr.common.cloud.ZkStateReader$7; A cluster state
change: WatchedEvent state:SyncConnected type:NodeDataChanged path:/collections/foo/state.json
for collection foo has occurred - updating... (live nodes size: 1)
INFO  - 2015-04-01 17:28:51.137; org.apache.solr.common.cloud.ZkStateReader; Updating data
for foo to ver 5 
INFO  - 2015-04-01 17:28:51.138; org.apache.solr.cloud.DistributedQueue$LatchWatcher; NodeChildrenChanged
fired on path /overseer/queue state SyncConnected
INFO  - 2015-04-01 17:28:51.138; org.apache.solr.cloud.ShardLeaderElectionContext; Enough
replicas found to continue.
INFO  - 2015-04-01 17:28:51.138; org.apache.solr.cloud.ShardLeaderElectionContext; I may be
the new leader - try and sync
INFO  - 2015-04-01 17:28:51.138; org.apache.solr.cloud.SyncStrategy; Sync replicas to http://192.168.1.2:8983/solr/foo_shard1_replica1/
INFO  - 2015-04-01 17:28:51.138; org.apache.solr.cloud.SyncStrategy; Sync Success - now sync
replicas to me
INFO  - 2015-04-01 17:28:51.138; org.apache.solr.cloud.SyncStrategy; http://192.168.1.2:8983/solr/foo_shard1_replica1/
has no replicas
INFO  - 2015-04-01 17:28:51.139; org.apache.solr.cloud.ShardLeaderElectionContext; I am the
new leader: http://192.168.1.2:8983/solr/foo_shard1_replica1/ shard1
INFO  - 2015-04-01 17:28:51.139; org.apache.solr.common.cloud.SolrZkClient; makePath: /collections/foo/leaders/shard1
INFO  - 2015-04-01 17:28:51.139; org.apache.solr.cloud.Overseer$ClusterStateUpdater; processMessage:
queueSize: 1, message = {
  "operation":"leader",
  "shard":"shard1",
  "collection":"foo"} current state version: 1
INFO  - 2015-04-01 17:28:51.140; org.apache.solr.cloud.overseer.ZkStateWriter; going to update_collection
/collections/foo/state.json version: 5
INFO  - 2015-04-01 17:28:51.141; org.apache.solr.common.cloud.ZkStateReader$7; A cluster state
change: WatchedEvent state:SyncConnected type:NodeDataChanged path:/collections/foo/state.json
for collection foo has occurred - updating... (live nodes size: 1)
INFO  - 2015-04-01 17:28:51.142; org.apache.solr.cloud.DistributedQueue$LatchWatcher; NodeChildrenChanged
fired on path /overseer/queue state SyncConnected
INFO  - 2015-04-01 17:28:51.142; org.apache.solr.common.cloud.ZkStateReader; Updating data
for foo to ver 6 
INFO  - 2015-04-01 17:28:51.144; org.apache.solr.cloud.Overseer$ClusterStateUpdater; processMessage:
queueSize: 1, message = {
  "operation":"leader",
  "shard":"shard1",
  "collection":"foo",
  "base_url":"http://192.168.1.2:8983/solr",
  "core":"foo_shard1_replica1",
  "state":"active"} current state version: 1
INFO  - 2015-04-01 17:28:51.145; org.apache.solr.cloud.overseer.ZkStateWriter; going to update_collection
/collections/foo/state.json version: 6
INFO  - 2015-04-01 17:28:51.145; org.apache.solr.common.cloud.ZkStateReader$7; A cluster state
change: WatchedEvent state:SyncConnected type:NodeDataChanged path:/collections/foo/state.json
for collection foo has occurred - updating... (live nodes size: 1)
INFO  - 2015-04-01 17:28:51.146; org.apache.solr.common.cloud.ZkStateReader; Updating data
for foo to ver 7 
INFO  - 2015-04-01 17:28:51.147; org.apache.solr.cloud.DistributedQueue$LatchWatcher; NodeChildrenChanged
fired on path /overseer/queue state SyncConnected
INFO  - 2015-04-01 17:28:51.196; org.apache.solr.cloud.ZkController; We are http://192.168.1.2:8983/solr/foo_shard1_replica1/
and leader is http://192.168.1.2:8983/solr/foo_shard1_replica1/
INFO  - 2015-04-01 17:28:51.196; org.apache.solr.cloud.ZkController; 

 In register, core.isReloaded? true 


INFO  - 2015-04-01 17:28:51.199; org.apache.solr.common.cloud.ZkStateReader; Updating data
for foo to ver 7 
INFO  - 2015-04-01 17:28:51.199; org.apache.solr.cloud.ZkController; watch zkdir /configs/foo
INFO  - 2015-04-01 17:28:51.199; org.apache.solr.schema.ZkIndexSchemaReader; Creating ZooKeeper
watch for the managed schema at /configs/foo/managed-schema
INFO  - 2015-04-01 17:28:51.199; org.apache.solr.cloud.ZkController$4; Running listeners for
/configs/foo
INFO  - 2015-04-01 17:28:51.200; org.apache.solr.core.SolrCore$11; config update listener
called for core foo_shard1_replica1
INFO  - 2015-04-01 17:28:51.200; org.apache.solr.schema.ZkIndexSchemaReader; Current schema
version 5 is already the latest
INFO  - 2015-04-01 17:28:51.200; org.apache.solr.schema.ZkIndexSchemaReader; Creating ZooKeeper
watch for the managed schema at /configs/foo/managed-schema
INFO  - 2015-04-01 17:28:51.200; org.apache.solr.core.SolrConfig; current version of requestparams
: 0
INFO  - 2015-04-01 17:28:51.201; org.apache.solr.schema.ZkIndexSchemaReader; Current schema
version 5 is already the latest
INFO  - 2015-04-01 17:28:51.201; org.apache.solr.common.cloud.DefaultConnectionStrategy; Reconnected
to ZooKeeper
INFO  - 2015-04-01 17:28:51.202; org.apache.solr.common.cloud.ConnectionManager; Connected:true
INFO  - 2015-04-01 17:28:51.211; org.apache.solr.cloud.ZkController$WatcherImpl; A node got
unwatched for /configs/foo
INFO  - 2015-04-01 17:28:51.211; org.apache.solr.cloud.ZkController$4; Running listeners for
/configs/foo
INFO  - 2015-04-01 17:28:51.211; org.apache.solr.core.SolrCore$11; config update listener
called for core foo_shard1_replica1
INFO  - 2015-04-01 17:28:51.212; org.apache.solr.core.SolrConfig; current version of requestparams
: 0
INFO  - 2015-04-01 17:29:07.080; org.apache.solr.servlet.SolrDispatchFilter; [admin] webapp=null
path=/admin/cores params={indexInfo=false&wt=json&_=1427909347078} status=0 QTime=0

INFO  - 2015-04-01 17:29:07.112; org.apache.solr.servlet.SolrDispatchFilter; [admin] webapp=null
path=/admin/info/system params={wt=json&_=1427909347099} status=0 QTime=11 
{code}




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