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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-259) map output http client does not timeout
Date Mon, 29 May 2006 06:16:29 GMT
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
 Assigned to: Owen O'Malley 
     Fix For: 0.3


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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