narendly commented on a change in pull request #535: Adjust the replica
rebalance calculating ordering method to avoid a static order.
URL: https://github.com/apache/helix/pull/535#discussion_r339720261
##########
File path:
helix-core/src/main/java/org/apache/helix/controller/rebalancer/waged/constraints/ConstraintBasedAlgorithm.java
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@@ -162,12 +162,19 @@ private double
getAssignmentNormalizedScore(AssignableNode node, AssignableRepli
int statePriority1 = replica1.getStatePriority();
int statePriority2 = replica2.getStatePriority();
if (statePriority1 == statePriority2) {
- // If state prioritizes are the same, compare the names.
- if (resourceName1.equals(resourceName2)) {
- return
replica1.getPartitionName().compareTo(replica2.getPartitionName());
- } else {
- return resourceName1.compareTo(resourceName2);
- }
+ // If state prioritizes are the same, try to randomize the
replicas order. Otherwise,
+ // the same replicas might always be moved in the rebalance. This
is because their
+ // rebalance calculating will always happen at the critical moment
while the cluster is
+ // almost full.
Review comment:
Why is the same order a problem? Do we not want it to be deterministic?
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