walterddr commented on code in PR #11205:
URL: https://github.com/apache/pinot/pull/11205#discussion_r1280753470
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pinot-query-runtime/src/main/java/org/apache/pinot/query/mailbox/ReceivingMailbox.java:
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@@ -51,16 +52,30 @@ public class ReceivingMailbox {
// TODO: Revisit if this is the correct way to apply back pressure
private final BlockingQueue<TransferableBlock> _blocks = new
ArrayBlockingQueue<>(DEFAULT_MAX_PENDING_BLOCKS);
private final AtomicReference<TransferableBlock> _errorBlock = new
AtomicReference<>();
+ @Nullable
+ private volatile Reader _reader;
Review Comment:
if we have the reader API. do we still need the callback registration? (we
can remove if this is fully covered by the reader callback
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