walterddr commented on code in PR #10432:
URL: https://github.com/apache/pinot/pull/10432#discussion_r1137981097


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/mailbox/GrpcSendingMailbox.java:
##########
@@ -72,6 +75,7 @@ public void send(TransferableBlock block)
   @Override
   public void complete()
       throws Exception {
+    // TODO: should wait for _mailboxContentStreamObserver.onNext() finish 
before calling onComplete().

Review Comment:
   I think currently it is guaranteed that onComplete is called after all 
onNext() --> implicitly via the OpChain scheduler. however we should still fix 
this systematically



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