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From "Siddharth Seth (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3721) Race in shuffle can cause it to hang
Date Wed, 25 Jan 2012 04:32:40 GMT
Race in shuffle can cause it to hang
------------------------------------

                 Key: MAPREDUCE-3721
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3721
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: 0.23.0
            Reporter: Siddharth Seth
            Assignee: Siddharth Seth
            Priority: Blocker


If all current {{Fetcher}}s complete while an in-memory merge is in progress - shuffle could
hang. 
Specifically - if the memory freed by an in-memory merge does not bring {{MergeManager.usedMemory}}
below {{MergeManager.memoryLimit}} and all current Fetchers complete before the in-memory
merge completes, another in-memory merge will not be triggered - and shuffle will hang. (All
new fetchers are asked to WAIT).


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