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https://issues.apache.org/jira/browse/FLINK-8737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16378597#comment-16378597
]
ASF GitHub Bot commented on FLINK-8737:
---------------------------------------
Github user pnowojski commented on a diff in the pull request:
https://github.com/apache/flink/pull/5583#discussion_r170923061
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/UnionInputGate.java
---
@@ -189,11 +189,11 @@ public void requestPartitions() throws IOException,
InterruptedException {
bufferOrEvent.setChannelIndex(channelIndexOffset +
bufferOrEvent.getChannelIndex());
- return Optional.ofNullable(bufferOrEvent);
+ return Optional.of(bufferOrEvent);
}
@Override
- public Optional<BufferOrEvent> pollNextBufferOrEvent() throws
IOException, InterruptedException {
+ public Optional<BufferOrEvent> pollNextBufferOrEvent() throws
UnsupportedOperationException {
--- End diff --
Do you need to declare to throw this exception? Do we want to declare
`RuntimeExceptions`?
> Creating a union of UnionGate instances will fail with
> UnsupportedOperationException when retrieving buffers
> ------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-8737
> URL: https://issues.apache.org/jira/browse/FLINK-8737
> Project: Flink
> Issue Type: Sub-task
> Components: Network
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Blocker
> Fix For: 1.5.0
>
>
> FLINK-8589 introduced a new polling method but did not implement
> {{UnionInputGate#pollNextBufferOrEvent()}}. This prevents UnionGate instances
> from containing a UnionGate instance which is explicitly allowed by its
> documentation and interface.
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