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https://issues.apache.org/jira/browse/MAPREDUCE-2386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13043950#comment-13043950
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Todd Lipcon commented on MAPREDUCE-2386:
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Konstantin: downgrading to Jetty 6.1.14 seems to be an effective workaround. 
Unfortunately it opens you up to some XSS security holes, but in some clusters 
that might be preferable :)

> 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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