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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HADOOP-259) map output http client does not timeout
Date Thu, 01 Jun 2006 19:53:30 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-259?page=all ]
     
Doug Cutting resolved HADOOP-259:
---------------------------------

    Resolution: Fixed

I just committed this.  Thanks, Owen!

> map output http client does not timeout
> ---------------------------------------
>
>          Key: HADOOP-259
>          URL: http://issues.apache.org/jira/browse/HADOOP-259
>      Project: Hadoop
>         Type: Bug

>   Components: mapred
>     Versions: 0.3
>     Reporter: Owen O'Malley
>     Assignee: Owen O'Malley
>      Fix For: 0.3
>  Attachments: http-client-timeout-2.patch, http-client-timeout.patch
>
> The new map output http client uses java.net.URLConnection to fetch the data file. However
under Java 1.4 there is no way to specify a timeout and it is set to infinite (or if not infinite
at least 12 hours).  This causes reduce tasks to get "stuck" in the "reduce > copy" phase
even after the "Task failed to report status for 600 seconds. Killing." message.
> I will add the code in the ReduceTaskRunner to make sure that copies in-flight don't
get stuck, but this is another point where a switch to java 1.5 would be helpful. Under 1.5
I could set the timeout on the connection and the read would timeout after the given interval
and my entire change would be local to MapOutputLocation.copyFile.
> For now, I'll assume that we need to maintain support for 1.4 and make the corresponding
fix, but I'm grumbling...

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