smjn commented on code in PR #17772:
URL: https://github.com/apache/kafka/pull/17772#discussion_r1837751641


##########
share/src/main/java/org/apache/kafka/server/share/persister/DefaultStatePersister.java:
##########
@@ -211,7 +228,8 @@ private ReadShareGroupStateResult readResponsesToResult(
                         int partition = partitionFuture.getKey();
                         CompletableFuture<ReadShareGroupStateResponse> future 
= partitionFuture.getValue();
                         try {
-                            ReadShareGroupStateResponse partitionResponse = 
future.get();
+                            // already completed because of allOf call in the 
caller
+                            ReadShareGroupStateResponse partitionResponse = 
future.get(0, TimeUnit.MILLISECONDS);

Review Comment:
   @apoorvmittal10 
   Yes, this is what is happening in the call to this util method. It happens 
like this:
   `
   CompletableFuture<Void> combinedFuture = CompletableFuture.allOf(...);
   
   return combinedFuture.thenApply(v -> readResponsesToResult(futureMap));
   `
   
   Code ref: 
https://github.com/apache/kafka/blob/trunk/share/src/main/java/org/apache/kafka/server/share/persister/DefaultStatePersister.java#L195



##########
share/src/main/java/org/apache/kafka/server/share/persister/DefaultStatePersister.java:
##########
@@ -211,7 +228,8 @@ private ReadShareGroupStateResult readResponsesToResult(
                         int partition = partitionFuture.getKey();
                         CompletableFuture<ReadShareGroupStateResponse> future 
= partitionFuture.getValue();
                         try {
-                            ReadShareGroupStateResponse partitionResponse = 
future.get();
+                            // already completed because of allOf call in the 
caller
+                            ReadShareGroupStateResponse partitionResponse = 
future.get(0, TimeUnit.MILLISECONDS);

Review Comment:
   @apoorvmittal10 
   Yes, this is what is happening in the call to this util method. It happens 
like this:
   ```
   CompletableFuture<Void> combinedFuture = CompletableFuture.allOf(...);
   return combinedFuture.thenApply(v -> readResponsesToResult(futureMap));
   ```
   
   Code ref: 
https://github.com/apache/kafka/blob/trunk/share/src/main/java/org/apache/kafka/server/share/persister/DefaultStatePersister.java#L195



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