helix-core/src/main/java/org/apache/helix/controller/rebalancer/strategy/AutoRebalanceStrategy.java [541:555]:
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  private Set<Replica> computeOrphaned() {
    Set<Replica> orphanedPartitions = new TreeSet<Replica>(_preferredAssignment.keySet());
    for (Replica r : _existingPreferredAssignment.keySet()) {
      if (orphanedPartitions.contains(r)) {
        orphanedPartitions.remove(r);
      }
    }
    for (Replica r : _existingNonPreferredAssignment.keySet()) {
      if (orphanedPartitions.contains(r)) {
        orphanedPartitions.remove(r);
      }
    }

    return orphanedPartitions;
  }
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helix-core/src/main/java/org/apache/helix/controller/strategy/AutoRebalanceStrategy.java [479:493]:
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  private Set<Replica> computeOrphaned() {
    Set<Replica> orphanedPartitions = new TreeSet<Replica>(_preferredAssignment.keySet());
    for (Replica r : _existingPreferredAssignment.keySet()) {
      if (orphanedPartitions.contains(r)) {
        orphanedPartitions.remove(r);
      }
    }
    for (Replica r : _existingNonPreferredAssignment.keySet()) {
      if (orphanedPartitions.contains(r)) {
        orphanedPartitions.remove(r);
      }
    }

    return orphanedPartitions;
  }
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