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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3972) A successful tip can fail unnecessarily
Date Tue, 19 Aug 2008 19:25:44 GMT
A successful tip can fail unnecessarily
---------------------------------------

                 Key: HADOOP-3972
                 URL: https://issues.apache.org/jira/browse/HADOOP-3972
             Project: Hadoop Core
          Issue Type: Bug
          Components: mapred
            Reporter: Amar Kamat


Consider the following sequence of events
1. tip _t_ has 5 attempts, _attempt_0-4_. Lets assume that _attempt_0,attempt_1_ and _attempt_2_
have failed. _attempt_3_ and _attempt_4_ are running. 
2. _attempt_3_ runs on tracker _t1_ and attempt_4 runs on tracker _t2_
3. _attempt_3_ reports success and the tip _t_ is marked successful
4. _attempt_4_ reports failure and the tip _t_ is failed based on the call to _TaskInProgress.incompleteSubTask()_.
Here the tip _t_ is failed unnecessarily.

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