[jira] Updated: (ZOOKEEPER-883) Idle cluster increasingly consumes CPU resources

["Lars George (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars George updated ZOOKEEPER-883:
----------------------------------

    Affects Version/s: 3.3.1

> 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
>
> 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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