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Posted to mapreduce-issues@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2011/03/31 02:41:06 UTC
[jira] [Commented] (MAPREDUCE-2386) TT jetty server stuck in tight
loop around epoll_wait
[ https://issues.apache.org/jira/browse/MAPREDUCE-2386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13013764#comment-13013764 ]
Konstantin Shvachko commented on MAPREDUCE-2386:
------------------------------------------------
This doesn't seem to be jetty problem per se. More like a bug in nio. I see it a lot lately in the rpc layer. Lots of different use cases with the same result:
{code}
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x00002aaab3dd8760> (a sun.nio.ch.Util$1)
- locked <0x00002aaab3dd83a0> (a java.util.Collections$UnmodifiableSet)
- locked <0x00002aaab3dd82e8> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80){code}
If anybody found a work around please share.
> TT jetty server stuck in tight loop around epoll_wait
> -----------------------------------------------------
>
> Key: MAPREDUCE-2386
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2386
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Affects Versions: 0.23.0
> Environment: RHEL 6.0 "Santiago"
> Reporter: Todd Lipcon
>
> In some load testing, I got a TaskTracker into a state where its Jetty server is in a tight loop calling epoll_wait, which is returning EINVAL:
> [pid 19573] epoll_wait(157, 40829000, 8192, 0) = -1 EINVAL (Invalid argument)
> It's not responding to any HTTP connections - connections are accepted and then just hang.
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