Patrick Hunt commented on ZOOKEEPER-883:

Let's keep them both open until we learn more.

Lars, can you have them turn off Nagios from pinging the ZK ensemble, then have 
them restart all the zk servers (the entire zk ensemble), then see if this 
problem still occurs and update this jira with the results? Thanks!

> Idle cluster increasingly consumes CPU resources
> ------------------------------------------------
>                 Key: ZOOKEEPER-883
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-883
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.3.1
>            Reporter: Lars George
>         Attachments: Archive.zip
> Monitoring the ZooKeeper nodes by polling the various ports using Nagios' 
> open port checks seems to cause a substantial raise of CPU being used by the 
> ZooKeeper daemons. Over the course of a week an idle cluster grew from a 
> baseline 2% to >10% CPU usage. Attached is a stack dump and logs showing the 
> occupied threads. At the end the daemon starts failing on "too many open 
> files" errors as all handles are used up.

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