public List<String> getPartiallySealedReplicas() {
    // TODO Efficient_Metadata_Operations_TODO get partial sealed replicas from HelixParticipant.
    return new ArrayList<>();
  }
@return a list of partially sealed replicas in InstanceConfig of local node.
ambry-api/src/main/java/com/github/ambry/clustermap/ReplicaStatusDelegate.java