Github user pnowojski commented on a diff in the pull request:
https://github.com/apache/flink/pull/5423#discussion_r169048737
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/InputGate.java
---
@@ -72,7 +73,19 @@
void requestPartitions() throws IOException, InterruptedException;
- BufferOrEvent getNextBufferOrEvent() throws IOException,
InterruptedException;
+ /**
+ * Blocking call waiting for next {@link BufferOrEvent}.
+ *
+ * @return {@code Optional.empty()} if {@link #isFinished()} returns
true.
+ */
+ Optional<BufferOrEvent> getNextBufferOrEvent() throws IOException,
InterruptedException;
--- End diff --
I would prefer to leave it as it is for now. I completely agree it's a bad
design, however in this PR I'm only documenting this behaviour and changing the
`null` to `Optional.empty()`, and because of the extensive scope of this change
already as it is, I would prefer to fix this issue later on.
---
