Devaraj K created YARN-1007:
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             Summary: [YARN-321] Enhance History Reader interface for Containers
                 Key: YARN-1007
                 URL: https://issues.apache.org/jira/browse/YARN-1007
             Project: Hadoop YARN
          Issue Type: Sub-task
    Affects Versions: YARN-321
            Reporter: Devaraj K
            Assignee: Devaraj K


If we want to show the containers used by application/app attempt, We need to 
have two more API's which returns collection of ContainerHistoryData for 
application id and applcation attempt id something like below. 

{code:xml}
  Collection<ContainerHistoryData> getContainers(
      ApplicationAttemptId appAttemptId);

  Collection<ContainerHistoryData> getContainers(ApplicationId appId);
{code}


{code:xml}
  /**
   * This method returns {@link Container} for specified {@link ContainerId}.
   * 
   * @param {@link ContainerId}
   * @return {@link Container} for ContainerId
   */
  ContainerHistoryData getAMContainer(ContainerId containerId);
{code}
In the above API, we need to change the argument to application attempt id or 
we can remove this API because every attempt history data has master container 
id field, using master container id, history data can get using this below API 
if it takes argument as container id.


{code:xml}
  /**
   * This method returns {@link ContainerHistoryData} for specified
   * {@link ApplicationAttemptId}.
   * 
   * @param {@link ApplicationAttemptId}
   * @return {@link ContainerHistoryData} for ApplicationAttemptId
   */
  ContainerHistoryData getContainer(ApplicationAttemptId appAttemptId);
{code}
Here application attempt can use numbers of containers but we cannot choose 
which container history data to return. This API argument also need to be 
changed to take container id instead of app attempt id. 


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