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https://issues.apache.org/jira/browse/SOLR-16154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17532386#comment-17532386
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Kevin Risden commented on SOLR-16154:
-------------------------------------
So my understanding is that the cleanup thread was hanging since zookeeper was
shutdown before the zkclient interacting with ZK was done. "blocking orderly
shutdown on threads doing useless work" - I don't think this should happen. We
should never see the ZK retries if ZK is running - it only happened due to the
out of orderness of the shutdown.
New cleanup threads getting run (probably due to watchers being triggered
during shutdown of nodes changing zk znodes) when ZK was shutting down was most
likely the issue.
> ZKEventListenerThread leaks from tests
> --------------------------------------
>
> Key: SOLR-16154
> URL: https://issues.apache.org/jira/browse/SOLR-16154
> Project: Solr
> Issue Type: Test
> Reporter: Mike Drob
> Assignee: Mike Drob
> Priority: Major
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> Seen repeatedly on Jenkins.
> {noformat}
> com.carrotsearch.randomizedtesting.ThreadLeakError: 1 thread leaked from
> SUITE scope at
> org.apache.solr.handler.designer.TestSchemaDesignerSettingsDAO:
> 1) Thread[id=1089, name=ZKEventListenerThread, state=TIMED_WAITING,
> group=TGRP-TestSchemaDesignerSettingsDAO]
> at java.base@18/java.lang.Thread.sleep(Native Method)
> at
> app//org.apache.solr.common.cloud.ZkCmdExecutor.retryDelay(ZkCmdExecutor.java:161)
> at
> app//org.apache.solr.common.cloud.ZkCmdExecutor.retryOperation(ZkCmdExecutor.java:82)
> at
> app//org.apache.solr.common.cloud.SolrZkClient.getData(SolrZkClient.java:361)
> at
> app//org.apache.solr.cloud.ZkSolrResourceLoader.openResource(ZkSolrResourceLoader.java:75)
> at
> app//org.apache.lucene.analysis.AbstractAnalysisFactory.getLines(AbstractAnalysisFactory.java:302)
> at
> app//org.apache.lucene.analysis.AbstractAnalysisFactory.getWordSet(AbstractAnalysisFactory.java:293)
> at
> app//org.apache.lucene.analysis.en.AbstractWordsFileFilterFactory.inform(AbstractWordsFileFilterFactory.java:88)
> at
> app//org.apache.solr.core.SolrResourceLoader.informAware(SolrResourceLoader.java:762)
> at
> app//org.apache.solr.schema.ManagedIndexSchema.informResourceLoaderAwareObjectsInChain(ManagedIndexSchema.java:1470)
> at
> app//org.apache.solr.schema.ManagedIndexSchema.informResourceLoaderAwareObjectsForFieldType(ManagedIndexSchema.java:1319)
> at
> app//org.apache.solr.schema.ManagedIndexSchema.postReadInform(ManagedIndexSchema.java:1307)
> at
> app//org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:654)
> at
> app//org.apache.solr.schema.IndexSchema.<init>(IndexSchema.java:188)
> at
> app//org.apache.solr.schema.ManagedIndexSchema.<init>(ManagedIndexSchema.java:119)
> at
> app//org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:279)
> at
> app//org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:51)
> at
> app//org.apache.solr.core.ConfigSetService.createIndexSchema(ConfigSetService.java:342)
> at
> app//org.apache.solr.core.ConfigSetService.lambda$loadConfigSet$0(ConfigSetService.java:253)
> at
> app//org.apache.solr.core.ConfigSetService$$Lambda$632/0x0000000801137758.get(Unknown
> Source)
> at app//org.apache.solr.core.ConfigSet.<init>(ConfigSet.java:49)
> at
> app//org.apache.solr.core.ConfigSetService.loadConfigSet(ConfigSetService.java:249)
> at
> app//org.apache.solr.core.CoreContainer.reload(CoreContainer.java:1850)
> at
> app//org.apache.solr.core.SolrCore.lambda$getConfListener$21(SolrCore.java:3394)
> at
> app//org.apache.solr.core.SolrCore$$Lambda$742/0x00000008011f2560.run(Unknown
> Source)
> at
> app//org.apache.solr.cloud.ZkController.lambda$fireEventListeners$18(ZkController.java:2761)
> at
> app//org.apache.solr.cloud.ZkController$$Lambda$1153/0x00000008014e8938.run(Unknown
> Source)
> at java.base@18/java.lang.Thread.run(Thread.java:833)
> at __randomizedtesting.SeedInfo.seed([DE9B93CA6D75B373]:0)
> {noformat}
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