wsry commented on a change in pull request #11877:
URL: https://github.com/apache/flink/pull/11877#discussion_r661992459
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File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/BoundedBlockingSubpartitionDirectTransferReader.java
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@@ -91,10 +91,14 @@ public BufferAndBacklog getNextBuffer() throws IOException {
updateStatistics(current);
- // We simply assume all the data are non-events for batch jobs to
avoid pre-fetching the
- // next header
- Buffer.DataType nextDataType =
- numDataAndEventBuffers > 0 ? Buffer.DataType.DATA_BUFFER :
Buffer.DataType.NONE;
+ // We simply assume all the data except for the last one
(EndOfPartitionEvent)
+ // are non-events for batch jobs to avoid pre-fetching the next header
+ Buffer.DataType nextDataType = Buffer.DataType.NONE;
+ if (numDataBuffers > 0) {
+ nextDataType = Buffer.DataType.DATA_BUFFER;
+ } else if (numDataAndEventBuffers > 0) {
+ nextDataType = Buffer.DataType.EVENT_BUFFER;
+ }
Review comment:
An EVENT_BUFFER does not need any credit to be sent. The
BoundedBlockingSubpartitionDirectTransferReader Implementation does not
distinguish EVENT_BUFFER and DATA_BUFFER for simplicity. However, after this
change, we need to distinguish EVENT_BUFFER and DATA_BUFFER because we do not
want to allocate any credit at downstream for an EVENT_BUFFER.
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