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From "zhihai xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-6425) ShuffleHandler passes wrong base parameter to getMapOutputInfo if mapId is not in the cache.
Date Fri, 03 Jul 2015 01:42:05 GMT
zhihai xu created MAPREDUCE-6425:
------------------------------------

             Summary: ShuffleHandler passes wrong base parameter to getMapOutputInfo if mapId
is not in the cache.
                 Key: MAPREDUCE-6425
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6425
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2, nodemanager
            Reporter: zhihai xu
            Assignee: zhihai xu


ShuffleHandler passes wrong {{base}} parameter to {{getMapOutputInfo}} if mapId is not in
the cache.
getMapOutputInfo expected the {{base}} parameter is {{getBaseLocation(jobId, user) + mapId}}
When it is called inside populateHeaders, the {{base}} parameter is set correctly
{code}
        String base = outputBaseStr + mapId;
        MapOutputInfo outputInfo = getMapOutputInfo(base, mapId, reduce, user);
{code}
When  it is called outside populateHeaders, the {{base}} parameter is set wrongly to outputBasePathStr
after number of mapId cached exceeds {{mapOutputMetaInfoCacheSize}}.
{code}
         String outputBasePathStr = getBaseLocation(jobId, user);
          MapOutputInfo info = mapOutputInfoMap.get(mapId);
          if (info == null) {
            info = getMapOutputInfo(outputBasePathStr, mapId, reduceId, user);
          }
{code}



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