jiajunwang commented on a change in pull request #639: Refine the WAGED
rebalancer to minimize the partial rebalance workload.
URL: https://github.com/apache/helix/pull/639#discussion_r355070740
##########
File path:
helix-core/src/main/java/org/apache/helix/controller/rebalancer/waged/model/ClusterModelProvider.java
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@@ -93,42 +184,126 @@ public static ClusterModel
generateClusterModel(ResourceControllerDataProvider d
return new ClusterModel(context, toBeAssignedReplicas, assignableNodes);
}
+ // Filter the replicas map so only the replicas that have been allocated in
the existing
+ // assignmentMap remain in the map.
+ private static void retainExistingReplicas(Map<String,
Set<AssignableReplica>> replicaMap,
Review comment:
Since this is a large list, for reducing the performance overhead of
creating a new list, in-place updating here is more efficient and straight
forward.
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