[GitHub] [helix] narendly commented on a change in pull request #639: Refine the WAGED rebalancer to minimize the partial rebalance workload.

[GitBox <gi...@apache.org>]

narendly 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_r352388264
 
 

 ##########
 File path: helix-core/src/main/java/org/apache/helix/controller/rebalancer/waged/WagedRebalancer.java
 ##########
 @@ -389,50 +376,81 @@ public void close() {
     return finalIdealStateMap;
   }
 
-  // TODO make the Baseline calculation async if complicated algorithm is used for the Baseline
-  private void refreshBaseline(ResourceControllerDataProvider clusterData,
-      Map<HelixConstants.ChangeType, Set<String>> clusterChanges, Map<String, Resource> resourceMap,
-      final CurrentStateOutput currentStateOutput)
+  private void globalRebalance(ResourceControllerDataProvider clusterData,
+      Map<String, Resource> resourceMap, final CurrentStateOutput currentStateOutput,
+      RebalanceAlgorithm algorithm)
       throws HelixRebalanceException {
+    _changeDetector.updateSnapshots(clusterData);
+    // Get all the changed items' information. Filter for the items that have content changed.
+    final Map<HelixConstants.ChangeType, Set<String>> clusterChanges =
+        _changeDetector.getChangeTypes().stream()
+            .collect(Collectors.toMap(changeType -> changeType, changeType -> {
+              Set<String> itemKeys = new HashSet<>();
+              itemKeys.addAll(_changeDetector.getAdditionsByType(changeType));
+              itemKeys.addAll(_changeDetector.getChangesByType(changeType));
+              itemKeys.addAll(_changeDetector.getRemovalsByType(changeType));
+              return itemKeys;
+            })).entrySet().stream().filter(changeEntry -> !changeEntry.getValue().isEmpty())
+            .collect(Collectors
+                .toMap(changeEntry -> changeEntry.getKey(), changeEntry -> changeEntry.getValue()));
+
     if (clusterChanges.keySet().stream()
         .anyMatch(GLOBAL_REBALANCE_REQUIRED_CHANGE_TYPES::contains)) {
-      LOG.info("Start calculating the new baseline.");
-      _globalBaselineCalcCounter.increment(1L);
-      _globalBaselineCalcLatency.startMeasuringLatency();
-
-      // For baseline calculation
+      // Build the cluster model for rebalance calculation.
+      // Note, for a baseline calculation,
 
 Review comment:
   Nit: Let's always say "global baseline calculation" to reduce confusion.

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services

---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscribe@helix.apache.org
For additional commands, e-mail: reviews-help@helix.apache.org