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https://issues.apache.org/jira/browse/ZOOKEEPER-1321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176724#comment-13176724
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Patrick Hunt commented on ZOOKEEPER-1321:
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I reported an issue to the list - the call to cnxns.size() is not synchronized
and I think it needs to be.
> Add number of client connections metric in JMX and srvr
> -------------------------------------------------------
>
> Key: ZOOKEEPER-1321
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1321
> Project: ZooKeeper
> Issue Type: Improvement
> Affects Versions: 3.3.4, 3.4.2
> Reporter: Neha Narkhede
> Assignee: Neha Narkhede
> Labels: patch
> Attachments: ZOOKEEPER-1321_trunk.patch
>
>
> The related conversation on the zookeeper user mailing list is here -
> http://apache.markmail.org/message/4jjcmooniowwugu2?q=+list:org.apache.hadoop.zookeeper-user
> It is useful to be able to monitor the number of disconnect operations on a
> client. This is generally indicative of a client going through large number
> of GC and hence disconnecting way too often from a zookeeper cluster.
> Today, this information is only indirectly exposed as part of the stat
> command which requires counting the results. That's alot of work for the
> server to do just to get connection count.
> For monitoring purposes, it will be useful to have this exposed through JMX
> and 4lw srvr.
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