@Override
  public boolean updateDataNodeInfoInCluster(ReplicaId replicaId, boolean shouldExist) {
    boolean updateResult = true;
    if (clusterMapConfig.clustermapUpdateDatanodeInfo) {
      synchronized (helixAdministrationLock) {
        updateResult = shouldExist ? addNewReplicaInfo(replicaId) : removeOldReplicaInfo(replicaId);
      }
    }
    return updateResult;
  }
@return list of stopped replicas from HelixAdmin
ambry-clustermap/src/main/java/com/github/ambry/clustermap/HelixParticipant.java