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https://issues.apache.org/jira/browse/SOLR-18155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18065106#comment-18065106
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Pierre Salagnac commented on SOLR-18155:
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My understanding is it happens when a replica wins the leader election and it
tries to actually become the leader after the {{ZkController}} instance was
shut down (call to {{preClose()}} already done or in-progress.
This is probably due to the `Thread.sleep(2500)` in the leader process.
{code:java}
// wait a moment for any floating updates to finish
Thread.sleep(2500);
{code}
A simple fix could be to abort the leadership process when parent
{{ZkController}} was closed.
> CollectionsAPISolrJTest seed reliably leaks unclosed ZkShardTerms
> -----------------------------------------------------------------
>
> Key: SOLR-18155
> URL: https://issues.apache.org/jira/browse/SOLR-18155
> Project: Solr
> Issue Type: Task
> Reporter: Chris M. Hostetter
> Priority: Major
>
> The following seed reliably fails on {{main}} (as of
> {{684894af5f1591af1c49c2bb6fdfdd83a94a89b2}}) due to ObjectReleaseTracker's
> of ZkShardTerms...
> {noformat}
> ./gradlew :solr:solrj:test --tests
> "org.apache.solr.client.solrj.impl.CloudSolrClientCacheTest.testStaleStateRetryWaitsAfterSkipFailure"
> "-Ptests.jvmargs=-XX:TieredStopAtLevel=1 -XX:+UseParallelGC
> -XX:ActiveProcessorCount=1 -XX:ReservedCodeCacheSize=120m"
> -Ptests.seed=517946C27016E5DC -Ptests.useSecurityManager=true
> -Ptests.file.encoding=ISO-8859-1
> {noformat}
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