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https://issues.apache.org/jira/browse/FLINK-8523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16558812#comment-16558812
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ASF GitHub Bot commented on FLINK-8523:
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NicoK commented on a change in pull request #5381: [FLINK-8523][network] Stop
assigning floating buffers for blocked input channels in exactly-once mode
URL: https://github.com/apache/flink/pull/5381#discussion_r205579424
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/UnionInputGate.java
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@@ -82,30 +82,40 @@
*/
private final Map<InputGate, Integer> inputGateToIndexOffsetMap;
+ /** A mapping from logical channel index (internal channel index in
input gate plus gate's offset) to input gate. */
+ private final Map<Integer, InputGate> indexToInputGateMap;
Review comment:
Similar to the `SingleInputGate`: use an array, rename member
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> Stop assigning floating buffers for blocked input channels in exactly-once
> mode
> -------------------------------------------------------------------------------
>
> Key: FLINK-8523
> URL: https://issues.apache.org/jira/browse/FLINK-8523
> Project: Flink
> Issue Type: Sub-task
> Components: Network
> Affects Versions: 1.5.0, 1.6.0
> Reporter: zhijiang
> Assignee: zhijiang
> Priority: Major
> Labels: pull-request-available
>
> In exactly-once mode, the input channel is set blocked state when reading
> barrier from it. And the blocked state will be released after barrier
> alignment or cancelled.
>
> In credit-based network flow control, we should avoid assigning floating
> buffers for blocked input channels because the buffers after barrier will not
> be processed by operator until alignment.
> To do so, we can fully make use of floating buffers and speed up barrier
> alignment in some extent.
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