narendly commented on a change in pull request #690: Reset the WAGED rebalancer
once the controller newly acquires leadership.
URL: https://github.com/apache/helix/pull/690#discussion_r369863611
##########
File path:
helix-core/src/main/java/org/apache/helix/controller/GenericHelixController.java
##########
@@ -1259,3 +1287,54 @@ private void initPipeline(Thread eventThread,
BaseControllerDataProvider cache)
eventThread.start();
}
}
+
+/**
+ * A wrapper class for the WAGED rebalancer instance.
+ */
+class WagedRebalancerRef {
+ private WagedRebalancer _rebalancer = null;
+ private boolean _isRebalancerValid = true;
+
+ private void createWagedRebalancer(HelixManager helixManager) {
+ // Create WagedRebalancer instance if it hasn't been already initialized
+ if (_rebalancer == null) {
+ _rebalancer = new WagedRebalancer(helixManager);
+ _isRebalancerValid = true;
+ }
+ }
+
+ /**
+ * Mark the current rebalancer object to be invalid, which indicates it
needs to be reset before
+ * the next usage.
+ */
+ synchronized void invalidRebalancer() {
Review comment:
"invalidate"Rebalancer?
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