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https://issues.apache.org/jira/browse/HBASE-17440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15813406#comment-15813406
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Lars Hofhansl commented on HBASE-17440:
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OK... Going to commit in a few.
(since there won't be another 0.98 release likely, it's just for completeness)
> [0.98] Make sure DelayedClosing chore is stopped as soon as an HConnection is
> closed
> ------------------------------------------------------------------------------------
>
> Key: HBASE-17440
> URL: https://issues.apache.org/jira/browse/HBASE-17440
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.98.24
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Attachments: 17440.txt
>
>
> We're seeing many issue with run-away ZK client connection in long running
> app servers. 10k or more send or event threads are happening frequently.
> While I looked around in the code I noticed that DelayedClosing closing is
> not immediately ended when an HConnection is closed, when there's an issue
> with HBase or ZK and client reconnect in a tight loop, this can lead
> temporarily to very many threads running. These will all get cleaned out
> after at most 60s, but during that time a lot of threads can be created.
> The fix is a one-liner. We'll likely file other issues soon.
> Interestingly branch-1 and beyond do not have this chore anymore, although -
> at least in branch-1 and later - I still see the ZooKeeperAliveConnection.
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