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https://issues.apache.org/jira/browse/SOLR-13393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16815281#comment-16815281
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Lucene/Solr QA commented on SOLR-13393:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 6s{color}
| {color:red} SOLR-13393 does not apply to master. Rebase required? Wrong
Branch? See
https://wiki.apache.org/solr/HowToContribute#Creating_the_patch_file for help.
{color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | SOLR-13393 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12965538/SOLR-13393.patch |
| Console output |
https://builds.apache.org/job/PreCommit-SOLR-Build/370/console |
| Powered by | Apache Yetus 0.7.0 http://yetus.apache.org |
This message was automatically generated.
> ZkClientClusterStateProvider can leak ZkStateReader (and associated watcher
> threads) if background threads attempt to use it after close() .
> --------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-13393
> URL: https://issues.apache.org/jira/browse/SOLR-13393
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Hoss Man
> Assignee: Hoss Man
> Priority: Major
> Attachments: SOLR-13393.patch, SOLR-13393.patch
>
>
> while digging into some test failures related to leaked ZkStateReader
> objects, i noticed a pattern which i beleive can be explained by the fact
> that ZkClientClusterStateProvider does not complain/fail if some caller tries
> to connect()/use it after it's already been closed – in this situation it
> will just re-create a new ZkStateReader (which is later leaked)
> So in in situations where background/timer threads use a
> SolrClientCloudManager/ZkClientClusterStateProvider, we might see...
> {noformat}
> T1 : start shutdown...
> T1 : ...SolrClientCloudManager.close()...
> T1 : ...ZkClientClusterStateProvider.close()...
> T1 : ...ZkStateReader.close()
> T1 : ...zkStateReader = null;
> T 2: run background thread/task/trigger...
> T 2: ...get ZkClientClusterStateProvider
> T 2: ...call ZkClientClusterStateProvider.connect()
> T 2: ...zkStateReader = new ZkStateReader() /* LEAKED */
> T 2: ... do something with ZkClientClusterStateProvider
> T 2: ...finish background thread/task/trigger
> T1 : ...finish shutdown of ZkClientClusterStateProvider /
> SolrClientCloudManager
> {noformat}
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