Jraaay commented on PR #3330:
URL: https://github.com/apache/celeborn/pull/3330#issuecomment-2974881858
> Can you provide some exception stack? I'm wondering what message has an
empty payload.
A potential NPE was found during my development. Sending certain
ControlMessages (like OneWayMessageResponse) with their default null payload
will trigger this exception due to a missing null check. This check is added to
improve code robustness, even though no trigger for this issue has been
identified in the current version.
```
case OneWayMessageResponse =>
new TransportMessage(MessageType.ONE_WAY_MESSAGE_RESPONSE, null)
```
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