Lars George commented on ZOOKEEPER-883:

This happened at a customer location, so no idea why they all were polled. 
After talking to Patrick I also advised switching to the appropriate 4-letter 
word check (like "stat" to check the node). Patrick suggested though we should 
issue the JIRA to capture the situation. If this is a dupe from ZOOKEEPER-880 
then please close this one as such. Your call.

> 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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