@Override
              public void onRemoval(
                  RemovalNotification<AttemptPathIdentifier, AttemptPathInfo> notification) {
                LOG.debug("PathCacheEviction: " + notification.getKey() + ", Reason=" +
                    notification.getCause());
              }
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