[jira] [Created] (MAPREDUCE-6963) MR Map or Reduce specified node label is missing due to concurrent task limits

["wei (JIRA)" <ji...@apache.org>]

wei created MAPREDUCE-6963:
------------------------------

             Summary: MR Map or Reduce specified node label is missing due to concurrent task limits
                 Key: MAPREDUCE-6963
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6963
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mr-am
    Affects Versions: 2.8.1
            Reporter: wei


In RMContainerAllocator#applyConcurrentTaskLimits, we limit the degree of task parallelism but not consider the node label specified for the ResourceRequest.
{code:java}
private void applyConcurrentTaskLimits() {
    ....... 
      setRequestLimit(PRIORITY_FAST_FAIL_MAP, mapResourceRequest,
          failedMapRequestLimit);
      setRequestLimit(PRIORITY_MAP, mapResourceRequest, normalMapRequestLimit);
    }
    .......
      setRequestLimit(PRIORITY_REDUCE, reduceResourceRequest,
          reduceRequestLimit);
    }
  }
{code}
Then we call the applyRequestLimits in RMContainerAllocator#makeRemoteRequest to apply the request limits. When the req.getNumContainers() > limit conditions are met，the original ResourceRequest(ask) will be replaced by the reqLimit which was generated by the above. 

{code:java}
private void applyRequestLimits() {
      .....
      // update an existing ask or send a new one if updating
      if (ask.remove(req) || requestLimitsToUpdate.contains(req)) {
        ResourceRequest newReq = req.getNumContainers() > limit
            ? reqLimit : req;
        ask.add(newReq);
        LOG.info("Applying ask limit of " + newReq.getNumContainers()
            + " for priority:" + reqLimit.getPriority()
            + " and capability:" + reqLimit.getCapability());
      }
      .......
  }
}
{code}





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