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From "Tim Armstrong (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (IMPALA-2982) Impalad Jvm : Zookeeper thread spinning in sun.nio.ch.EPollArrayWrapper.epollWait
Date Thu, 30 Mar 2017 19:58:42 GMT

     [ https://issues.apache.org/jira/browse/IMPALA-2982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tim Armstrong resolved IMPALA-2982.
-----------------------------------
    Resolution: Cannot Reproduce

I don't believe we've seen this since we added the mitigation.

> Impalad Jvm : Zookeeper thread spinning in sun.nio.ch.EPollArrayWrapper.epollWait
> ---------------------------------------------------------------------------------
>
>                 Key: IMPALA-2982
>                 URL: https://issues.apache.org/jira/browse/IMPALA-2982
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Frontend
>    Affects Versions: Impala 2.5.0
>            Reporter: Mostafa Mokhtar
>            Assignee: Tim Armstrong
>            Priority: Minor
>         Attachments: impalad_jstacks.txt
>
>
> There appears to be a JVM thread runnning as part of the impalad process spinning, jstack
shows that it is the ZooKeeper thread
> {code}
> "main-SendThread(eXXX.XXXX.XXXXXX.com:2181)" daemon prio=10 tid=0x0000000007afd800 nid=0xdd5f
runnable [0x00007fca7aba2000]
>    java.lang.Thread.State: RUNNABLE
>         at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
>         at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
>         at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
>         at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
>         - locked <0x0000000426290c20> (a sun.nio.ch.Util$2)
>         - locked <0x0000000426290c10> (a java.util.Collections$UnmodifiableSet)
>         - locked <0x0000000426290988> (a sun.nio.ch.EPollSelectorImpl)
>         at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
>         at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:338)
>         at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
> {code}
> Queries appear to run fine though while the spinning is happening.



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