jiajunwang opened a new issue #645: Output of PreferenceListNodeComparator is not deterministic URL: https://github.com/apache/helix/issues/645 https://github.com/apache/helix/blob/88296bc41df1a31131659f7004146f14f94b7da3/helix-core/src/main/java/org/apache/helix/controller/rebalancer/AbstractRebalancer.java#L417 The comparison is done based on the priority if the 1st and 2nd conditions are not true. However, consider there could more than one instance that has the same state, the returned "ordered" list might be random. This might cause an unexpected replica state change.
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