i3wangyi 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_r354617352
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File path:
helix-core/src/main/java/org/apache/helix/controller/rebalancer/waged/model/ClusterModelProvider.java
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@@ -75,9 +150,25 @@ public static ClusterModel
generateClusterModel(ResourceControllerDataProvider d
// Check if the replicas need to be reassigned.
Map<String, Set<AssignableReplica>> allocatedReplicas =
new HashMap<>(); // <instanceName, replica set>
- Set<AssignableReplica> toBeAssignedReplicas =
- findToBeAssignedReplicas(replicaMap, clusterChanges, activeInstances,
- dataProvider.getLiveInstances().keySet(), bestPossibleAssignment,
allocatedReplicas);
+ Set<AssignableReplica> toBeAssignedReplicas;
+ switch (scopeType) {
+ case GLOBAL_BASELINE:
+ toBeAssignedReplicas =
findToBeAssignedReplicasByClusterChanges(replicaMap, activeInstances,
+ dataProvider.getLiveInstances().keySet(), clusterChanges,
bestPossibleAssignment,
+ allocatedReplicas);
+ break;
+ case PARTIAL:
+ // Filter to remove the replicas that do not exist in the baseline
given but exist in
+ // replicaMap. This is because such replicas are new additions that do
not need to be
+ // rebalanced right away.
+ retainExistingReplicas(replicaMap, baselineAssignment);
+ toBeAssignedReplicas =
+ findToBeAssignedReplicasByComparingBaseline(replicaMap,
activeInstances,
+ baselineAssignment, bestPossibleAssignment, allocatedReplicas);
+ break;
Review comment:
I don't think the switch is needed because 1. the enum is private 2. even
the caller of the method is private, thus the default case will never be used.
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