@Override
  public int hashCode() {
    int result = taskName.hashCode();
    result = 31 * result + systemStreamPartitions.hashCode();
    result = 31 * result + changelogPartition.hashCode();
    result = 31 * result + taskMode.hashCode();
    return result;
  }
Returns the {@link Partition} used for all changelogs for this task.
@return changelog partition for this task
samza-api/src/main/java/org/apache/samza/job/model/TaskModel.java