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https://issues.apache.org/jira/browse/SOLR-12200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439895#comment-16439895
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Mikhail Khludnev commented on SOLR-12200:
-----------------------------------------
[~varunthacker], I suppose so, but hardly able to prove it.
Meanwhile beasting reproduced the stackoverflow, it seems like
{quote}
o.a.s.c.LeaderElector node
exists%0Aorg.apache.zookeeper.KeeperException$NodeExistsException:
KeeperErrorCode = NodeExists for /overseer_elect/leader%0A%09at
org.apache.zookeeper.KeeperException.create(KeeperException.java:122)
~[zookeeper-3.4.11.jar:3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0]%0A%09at
org.apache.zookeeper.KeeperException.create(KeeperException.java:54)
~[zookeeper-3.4.11.jar:3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0]%0A%09at
org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:786)
~[zookeeper-3.4.11.jar:3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0]%0A%09at
org.apache.solr.common.cloud.SolrZkClient.lambda$makePath$8(SolrZkClient.java:496)
~[java/:?]%0A%09at
org.apache.solr.common.cloud.ZkCmdExecutor.retryOperation(ZkCmdExecutor.java:60)
~[java/:?]%0A%09at
org.apache.solr.common.cloud.SolrZkClient.makePath(SolrZkClient.java:495)
~[java/:?]%0A%09at
org.apache.solr.common.cloud.SolrZkClient.makePath(SolrZkClient.java:438)
~[java/:?]%0A%09at
org.apache.solr.common.cloud.SolrZkClient.makePath(SolrZkClient.java:425)
~[java/:?]%0A%09at
org.apache.solr.cloud.OverseerElectionContext.runLeaderProcess(ElectionContext.java:840)
~[java/:?]%0A%09at
org.apache.solr.cloud.LeaderElector.runIamLeaderProcess(LeaderElector.java:170)
~[java/:?]at
org.apache.solr.cloud.LeaderElector.checkIfIamLeader(LeaderElector.java:138)
[java/:?]%0A%09at
org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:307)
[java/:?]%0A%09at
org.apache.solr.cloud.LeaderElector.retryElection(LeaderElector.java:393)
[java/:?]%0A%09at
org.apache.solr.cloud.LeaderElector.checkIfIamLeader(LeaderElector.java:138)
[java/:?]%0A%09at
org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:307)
[java/:?]%0A%09at
org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:216)
[java/:?]%0A%09at
org.apache.solr.cloud.OverseerTest.testOverseerStatsReset(OverseerTest.java:712)
{quote}
This stack tends to grow until it hits the stack boundary. I don't know how
it's related to the patch.
> ZkControllerTest failure. Leaking Overseer
> ------------------------------------------
>
> Key: SOLR-12200
> URL: https://issues.apache.org/jira/browse/SOLR-12200
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: Mikhail Khludnev
> Priority: Major
> Attachments: SOLR-12200.patch, SOLR-12200.patch,
> patch-unit-solr_core.zip, tests-failures.txt, tests-failures.txt.gz,
> zk.fail.txt.gz
>
>
> Failure seems suspiciously the same.
> [junit4] 2> 499919 INFO
> (TEST-ZkControllerTest.testReadConfigName-seed#[BC856CC565039E77])
> [n:127.0.0.1:8983_solr ] o.a.s.c.Overseer Overseer
> (id=73578760132362243-127.0.0.1:8983_solr-n_0000000000) closing
> [junit4] 2> 499920 INFO
> (OverseerStateUpdate-73578760132362243-127.0.0.1:8983_solr-n_0000000000) [
> ] o.a.s.c.Overseer Overseer Loop exiting : 127.0.0.1:8983_solr
> [junit4] 2> 499920 ERROR
> (OverseerCollectionConfigSetProcessor-73578760132362243-127.0.0.1:8983_solr-n_0000000000)
> [ ] o.a.s.c.OverseerTaskProcessor Unable to prioritize overseer
> [junit4] 2> java.lang.InterruptedException: null
> [junit4] 2> at java.lang.Object.wait(Native Method) ~[?:1.8.0_152]
> [junit4] 2> at java.lang.Object.wait(Object.java:502)
> ~[?:1.8.0_152]
> [junit4] 2> at
> org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1409)
> ~[zookeeper-3.4.11.jar:3.4
> then it spins in SessionExpiredException, all tests pass but suite fails due
> to leaking Overseer.
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