[jira] Commented: (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:comment-tabpanel&focusedCommentId=12916413#action_12916413 ] 

Lars George commented on ZOOKEEPER-883:
---------------------------------------

Here is the config, which is a modified CDH3 version, pretty much standard:

{code}
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
dataDir=/var/zookeeper
# the port at which the clients will connect
clientPort=2181
server.0=hadoop-primary.i.foobar.com:2888:3888
server.1=hadoop-a.i.foobar.com:2888:3888
server.2=hadoop-c.i.foobar.com:2888:3888
{code}

> 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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