Skip if no longer leader

Author: Michael Askndafi

services/venice-controller/src/main/java/com/linkedin/venice/controller/DeadStoreStatsPreFetchTask.java

@@ -59,6 +59,12 @@ public void run() {
     while (isRunning.get()) {
       try {
         Utils.sleep(refreshIntervalMs);
+
+        // Check if controller is still the leader before fetching stats
+        if (!admin.isLeaderControllerFor(clusterName)) {
+          continue;
+        }
+
         long startTime = System.currentTimeMillis();
         logger.debug("Fetching dead store stats for cluster: {}", clusterName);
         admin.preFetchDeadStoreStats(clusterName, getStoresInCluster());