@Override
  public long getId() {
    return id;
  }
Instantiate an AmbryPartition instance.
@param id the id associated with this partition.
@param partitionClass the partition class that this partition belongs to
@param clusterManagerQueryHelper {@link HelixClusterManagerQueryHelper} to query cluster information.
ambry-clustermap/src/main/java/com/github/ambry/clustermap/AmbryPartition.java