zhijiangW commented on a change in pull request #12261:
URL: https://github.com/apache/flink/pull/12261#discussion_r428139107
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/RemoteInputChannel.java
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@@ -181,6 +181,14 @@ void retriggerSubpartitionRequest(int subpartitionIndex)
throws IOException {
moreAvailable = !receivedBuffers.isEmpty();
}
+ if (next == null) {
Review comment:
I guess it can probably happen in practice. When the canceler thread
already released the respective input channel, but the task thread might still
call `getNextBuffer` in the case of released `receivedBuffers`, then it can get
the `null` buffer.
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