protected void updatePartitionToDiskManager(ReplicaId replicaId) {
    partitionToDiskManager.put(replicaId.getPartitionId(), diskToDiskManager.get(replicaId.getDiskId()));
  }
Helper utility to add replicaId to partitionToDiskManager.
@param replicaId the {@link ReplicaId} whose partition and disk to use.
ambry-store/src/main/java/com/github/ambry/store/StorageManager.java