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https://issues.apache.org/jira/browse/ZOOKEEPER-427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Zhuravlev updated ZOOKEEPER-427:
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Attachment: zk_quorum_recv_eof.patch
Hi!
I think, that problem is not in nio, but in QuorumCnxManager.
Manager start while-loop when channel is connected and start wait msgLength in
read call.
At this moment process from other side stops and "read" return "-1"
But there is no checking of "read" return value, so loop become infinite.
Please, look at my patch, it works for my case.
> ZooKeeper server unexpectedly high CPU utilisation
> --------------------------------------------------
>
> Key: ZOOKEEPER-427
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-427
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.1.1
> Environment: Linux: 2.6.18-92.1.18.el5 #1 SMP Wed Nov 12 09:19:49 EST
> 2008 x86_64 x86_64 x86_64 GNU/Linux
> java version "1.6.0_03"
> Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
> Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_03-b05, mixed mode)
> Reporter: Satish Bhatti
> Assignee: Benjamin Reed
> Attachments: zk_quorum_recv_eof.patch, zoo.cfg, zookeeper-jstack.log,
> zookeeper.log
>
>
> I am running a 5 node ZooKeeper cluster and I noticed that one of them has
> very high CPU usage:
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 6883 infact 22 0 725m 41m 4188 S 95 0.5
> 5671:54 java
> It is not "doing anything" application-wise at this point, so I was wondering
> why the heck it's using up so much CPU.
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