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https://issues.apache.org/jira/browse/SOLR-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13476422#comment-13476422
]
Joel Bernstein commented on SOLR-3939:
--------------------------------------
No sure if this helps. Here is stack trace from my second solr instance. This
is the instance that would be the leader after the leader core was unloaded on
the first instance.
SEVERE: There was a problem finding the leader in
zk:org.apache.solr.common.SolrException: Could not get leader props
at
org.apache.solr.cloud.ZkController.getLeaderProps(ZkController.java:709)
at
org.apache.solr.cloud.ZkController.getLeaderProps(ZkController.java:673)
at
org.apache.solr.cloud.ZkController.waitForLeaderToSeeDownState(ZkController.java:1070)
at
org.apache.solr.cloud.ZkController.registerAllCoresAsDown(ZkController.java:273)
at org.apache.solr.cloud.ZkController.access$100(ZkController.java:82)
at org.apache.solr.cloud.ZkController$1.command(ZkController.java:190)
at
org.apache.solr.common.cloud.ConnectionManager$1.update(ConnectionManager.java:116)
at
org.apache.solr.common.cloud.DefaultConnectionStrategy.reconnect(DefaultConnectionStrategy.java:46)
at
org.apache.solr.common.cloud.ConnectionManager.process(ConnectionManager.java:90)
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:526)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:502)
Caused by: org.apache.zookeeper.KeeperException$NoNodeException:
KeeperErrorCode = NoNode for /collections/collection1/leaders/shard1
at org.apache.zookeeper.KeeperException.create(KeeperException.java:102)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:927)
at
org.apache.solr.common.cloud.SolrZkClient$7.execute(SolrZkClient.java:244)
at
org.apache.solr.common.cloud.SolrZkClient$7.execute(SolrZkClient.java:241)
at
org.apache.solr.common.cloud.ZkCmdExecutor.retryOperation(ZkCmdExecutor.java:63)
at
org.apache.solr.common.cloud.SolrZkClient.getData(SolrZkClient.java:241)
at
org.apache.solr.cloud.ZkController.getLeaderProps(ZkController.java:687)
... 10 more
Oct 15, 2012 3:39:18 PM org.apache.solr.common.SolrException log
SEVERE: :org.apache.solr.common.SolrException: There was a problem finding the
leader in zk
at
org.apache.solr.cloud.ZkController.waitForLeaderToSeeDownState(ZkController.java:1080)
at
org.apache.solr.cloud.ZkController.registerAllCoresAsDown(ZkController.java:273)
at org.apache.solr.cloud.ZkController.access$100(ZkController.java:82)
at org.apache.solr.cloud.ZkController$1.command(ZkController.java:190)
at
org.apache.solr.common.cloud.ConnectionManager$1.update(ConnectionManager.java:116)
at
org.apache.solr.common.cloud.DefaultConnectionStrategy.reconnect(DefaultConnectionStrategy.java:46)
at
org.apache.solr.common.cloud.ConnectionManager.process(ConnectionManager.java:90)
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:526)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:502)
> Solr Cloud recovery and leader election when unloading leader core
> ------------------------------------------------------------------
>
> Key: SOLR-3939
> URL: https://issues.apache.org/jira/browse/SOLR-3939
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.0-BETA, 4.0
> Reporter: Joel Bernstein
> Assignee: Mark Miller
> Labels: 4.0.1_Candidate
> Fix For: 4.1, 5.0
>
> Attachments: SOLR-3939.patch
>
>
> When a leader core is unloaded using the core admin api, the followers in the
> shard go into recovery but do not come out. Leader election doesn't take
> place and the shard goes down.
> This effects the ability to move a micro-shard from one Solr instance to
> another Solr instance.
> The problem does not occur 100% of the time but a large % of the time.
> To setup a test, startup Solr Cloud with a single shard. Add cores to that
> shard as replicas using core admin. Then unload the leader core using core
> admin.
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