sunhaibotb commented on a change in pull request #8124: [FLINK-11877] Implement
the runtime handling of the InputSelectable interface
URL: https://github.com/apache/flink/pull/8124#discussion_r275251339
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/UnionInputGate.java
##########
@@ -197,22 +217,23 @@ public void requestPartitions() throws IOException,
InterruptedException {
return Optional.of(bufferOrEvent);
}
- @Override
- public Optional<BufferOrEvent> pollNextBufferOrEvent() throws
UnsupportedOperationException {
- throw new UnsupportedOperationException();
- }
-
- private InputGateWithData waitAndGetNextInputGate() throws IOException,
InterruptedException {
+ private InputGateWithData waitAndGetNextInputGate(boolean blocking)
throws IOException, InterruptedException {
Review comment:
Try running the benchmark of `StreamNetwork*` and the results of each run
are quite different, so it is difficult to measure the performance impact of
`Optional`. According to my previous use, returning `Optional` in `public
Optional<StreamElement> NetworkInput#pollNextElement()` has a performance
penalty, because `Optional.of()` would new object. But that is per-record, and
the impact should be negligible for per-buffer, so I think that adding a
`@Nullable`or returning `Optional <...>` is all right.
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