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_r370755780
##########
File path:
helix-core/src/main/java/org/apache/helix/controller/GenericHelixController.java
##########
@@ -1258,4 +1292,57 @@ private void initPipeline(Thread eventThread,
BaseControllerDataProvider cache)
eventThread.setDaemon(true);
eventThread.start();
}
+
+ /**
+ * A wrapper class for the stateful rebalancer instance that will be tracked
in the
+ * GenericHelixController.
+ */
+ private abstract class StatefulRebalancerRef<T extends StatefulRebalancer> {
+ private T _rebalancer = null;
+ private boolean _isRebalancerValid = true;
+
+ /**
+ * @param helixManager
+ * @return A new stateful rebalancer instance with initial state.
+ */
+ protected abstract T createRebalancer(HelixManager helixManager);
Review comment:
How do we prevent this from being called multiple times?
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