Rohith Sharma K S created YARN-4547:

             Summary: LeagQueue#getApplications() is read-only interface, but 
it provides reference to caller
                 Key: YARN-4547
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacity scheduler
            Reporter: Rohith Sharma K S
            Assignee: Rohith Sharma K S

The below API is read-only interface, but returning reference to the caller. 
This causing caller to modify the orderingPolicy entities. If required 
reference of ordering policy, caller can use 
   * Obtain (read-only) collection of active applications.
  public Collection<FiCaSchedulerApp> getApplications() {
    return orderingPolicy.getSchedulableEntities();

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