@Override
    public String toString() {
      return "AttemptPathIdentifier{" +
          "jobId='" + jobId + '\'' +
          ", dagId=" + dagId +
          ", user='" + user + '\'' +
          ", attemptId='" + attemptId + '\'' +
          '}';
    }
Unregister a specific dag

This method and registerDag must be synchronized externally to prevent races in shuffle token registration/unregistration

@param dir
@param applicationIdString
@param dagIdentifier
llap-server/src/java/org/apache/hadoop/hive/llap/shufflehandler/ShuffleHandler.java