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https://issues.apache.org/jira/browse/HBASE-20597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479433#comment-16479433
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Andrew Purtell commented on HBASE-20597:
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If the connection problem is persistent, like loss of shared trust between the
clusters, we may accumulate unclosed ZKW instances over time, with a ZK send
thread and event thread each, and eventually have enough leaked threads to
cause OOME (cannot allocate native thread).
> Use a lock to serialize access to a shared reference to ZooKeeperWatcher in
> HBaseReplicationEndpoint
> ----------------------------------------------------------------------------------------------------
>
> Key: HBASE-20597
> URL: https://issues.apache.org/jira/browse/HBASE-20597
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.3.2, 1.4.4
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Priority: Minor
> Fix For: 3.0.0, 2.1.0, 1.5.0, 1.3.3, 2.0.1, 1.4.5
>
>
> The code that closes down a ZKW that fails to initialize when attempting to
> connect to the remote cluster is not MT safe and can in theory leak
> ZooKeeperWatcher instances. The allocation of a new ZKW and store to the
> reference is not atomic. Might have concurrent allocations with only one
> winning store, leading to leaked ZKW instances.
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