pnowojski commented on a change in pull request #13529:
URL: https://github.com/apache/flink/pull/13529#discussion_r501762982
##########
File path:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/io/StreamTwoInputProcessor.java
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@@ -23,16 +23,12 @@
import org.apache.flink.runtime.checkpoint.channel.ChannelStateWriter;
Review comment:
Ok, I see, and I agree that your change would increase usability of this
code, protecting against those kind of bugs. However as you proposed it would
currently add an extra `volatile` check. I think this could be addressed, by
combining this check with anti-starvation check. However on the other hand...
It looks like I have implemented it differently in the
`StreamMultipleInputProcessor`, where I do not see such check at all, and the
processor completely relies on the `InputStatus`, which all in all I think is
easier way of handling this. `isAvailable()` is checked only after the first
`processInput` call after being woken up:
```
private int selectNextReadingInputIndex() {
if (!inputSelectionHandler.isAnyInputAvailable()) {
fullCheckAndSetAvailable();
}
...
}
```
Regarding the documentation. `AvailabilityProvider` already has quite a bit
of java docs, but maybe you could help updating it to avoid such confusion in
the future?
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