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https://issues.apache.org/jira/browse/ZOOKEEPER-1347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14051448#comment-14051448
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Bill Havanki commented on ZOOKEEPER-1347:
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It appears this was fixed as part of ZOOKEEPER-1504. The HashSet in
ServerCnxnFactory was replaced with a concurrent set.
> Fix the cnxns to use a concurrent data structures
> -------------------------------------------------
>
> Key: ZOOKEEPER-1347
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1347
> Project: ZooKeeper
> Issue Type: Sub-task
> Components: server
> Reporter: Camille Fournier
> Fix For: 3.5.0
>
>
> Cnxns is currently stored as a HashSet but may be accessed by multiple
> threads concurrently. Instead of doing our own sync we should investigate
> using a proper concurrent data structure for this.
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