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https://issues.apache.org/jira/browse/SOLR-12807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16628968#comment-16628968
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Erick Erickson commented on SOLR-12807:
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Possibly SOLR-10420?
> out of memory error due to a lot of zk watchers in solr cloud
> --------------------------------------------------------------
>
> Key: SOLR-12807
> URL: https://issues.apache.org/jira/browse/SOLR-12807
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 6.1
> Reporter: Mine_Orange
> Priority: Major
>
> Analyzing the dump file,we found a lot of watchers in childWatches of
> ZKWatchManager,nearly 1.8G,the znode of childWatches is
> /overseer/collection-queue-work,confirm that it is not because of the
> frequent use of collection API and the network is normal.
> The instance is the overseer leader of a solr cluster and did not restart for
> more than a year,suspect that the watchers grow with time.
> Our solr version is 6.1 and zookeeper version is 3.4.9.
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