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Posted to mapreduce-dev@hadoop.apache.org by "Siddharth Seth (Created) (JIRA)" <ji...@apache.org> on 2012/01/25 05:32:40 UTC

[jira] [Created] (MAPREDUCE-3721) Race in shuffle can cause it to hang

Race in shuffle can cause it to hang
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                 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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