gortiz commented on code in PR #16903:
URL: https://github.com/apache/pinot/pull/16903#discussion_r2425547898
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pinot-query-runtime/src/main/java/org/apache/pinot/query/mailbox/channel/MailboxContentObserver.java:
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@@ -49,6 +50,7 @@ public class MailboxContentObserver implements
StreamObserver<MailboxContent> {
private final MailboxService _mailboxService;
private final StreamObserver<MailboxStatus> _responseObserver;
private final List<ByteBuffer> _mailboxBuffers =
Collections.synchronizedList(new ArrayList<>());
+ private boolean _closedStream = false;
Review Comment:
> I think this needs to be volatile
It doesn't have to be volatile given StreamObservers should be
thread-compatible. Given we never manually call methods on this class but
instead it is GRPC the one that calls it, it is safe to assume
thread-compatibility is honored.
> Do you find places where we close the stream multiple times?
It could happen if an incorrect sender sends a block after an EOS.
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