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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4668) JettyBugMonitor thread should kill TT if can't find jetty selector thread
Date Wed, 19 Sep 2012 18:04:07 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13458903#comment-13458903
] 

Thomas Graves commented on MAPREDUCE-4668:
------------------------------------------

thanks Todd, yeah we still haven't had a chance to try your patched jetty version. 

I agree with you about being careful for the race at startup.  I haven't checked our clusters
to see if we see the warning message but the jetty thread is actually there.
                
> JettyBugMonitor thread should kill TT if can't find jetty selector thread
> -------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4668
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4668
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 1.0.2
>            Reporter: Thomas Graves
>
> We ran into a case where a tasktracker started but for some reason the jetty thread didn't
start or died shortly after start.  I couldn't find anything useful as to why.  
> Since Jetty wasn't running the TT couldn't serve up any map output.  The JettyBugMonitor
thread saw this but just spit out the warning. We should have it just kill the TT since its
basically unusable without it.
> > 2012-07-23 05:42:04,072 WARN org.apache.hadoop.mapred.JettyBugMonitor: Could
> not locate Jetty selector threads

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