wsry commented on a change in pull request #11877:
URL: https://github.com/apache/flink/pull/11877#discussion_r661986812
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/CreditBasedPartitionRequestClientHandler.java
##########
@@ -340,7 +355,15 @@ private void decodeBufferOrEvent(
RemoteInputChannel inputChannel, NettyMessage.BufferResponse
bufferOrEvent)
throws Throwable {
if (bufferOrEvent.isBuffer() && bufferOrEvent.bufferSize == 0) {
- inputChannel.onEmptyBuffer(bufferOrEvent.sequenceNumber,
bufferOrEvent.backlog);
+ try {
+ inputChannel.onEmptyBuffer(bufferOrEvent.sequenceNumber,
bufferOrEvent.backlog);
+ } finally {
+ // recycle the empty buffer directly
+ Buffer buffer = bufferOrEvent.getBuffer();
+ if (buffer != null) {
+ buffer.recycleBuffer();
Review comment:
It is not a bug. The empty buffer will not be sent to the downstream
before. However, after this change, the empty buffer will be sent to the
downstream task to release the credit already allocated for it. If we do not
send the empty buffer to the downstream, the corresponding downstream channel
will occupy more credits than needed.
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