MarkGaox commented on code in PR #2886:
URL: https://github.com/apache/helix/pull/2886#discussion_r1731588044


##########
helix-rest/src/main/java/org/apache/helix/rest/clusterMaintenanceService/MaintenanceManagementService.java:
##########
@@ -472,9 +472,15 @@ private MaintenanceManagementInstanceInfo 
takeFreeSingleInstanceHelper(String cl
   private List<String> batchHelixInstanceStoppableCheck(String clusterId,
       Collection<String> instances, Map<String, StoppableCheck> 
finalStoppableChecks,
       Set<String> toBeStoppedInstances) {
+
+    // Perform all but min_active replicas check in parallel
     Map<String, Future<StoppableCheck>> helixInstanceChecks = 
instances.stream().collect(
         Collectors.toMap(Function.identity(), instance -> POOL.submit(
             () -> performHelixOwnInstanceCheck(clusterId, instance, 
toBeStoppedInstances))));
+
+    // Perform min_active replicas check sequentially
+    addInstanceMinActiveReplicaCheck(helixInstanceChecks, 
toBeStoppedInstances);

Review Comment:
   Sounds good, let's keep the current order. What do you think about adding 
this check to the filterInstancesForNextCheck() method? Otherwise, we would end 
up with two identical methods, which seems redundant.



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