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https://issues.apache.org/jira/browse/FLINK-15914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17034320#comment-17034320
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zhijiang commented on FLINK-15914:
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Merged in master: 2a0555bc85e5256718e6b546ffa768a80386e892
> Miss the barrier alignment metric for the case of two inputs
> ------------------------------------------------------------
>
> Key: FLINK-15914
> URL: https://issues.apache.org/jira/browse/FLINK-15914
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing, Runtime / Metrics
> Affects Versions: 1.10.0
> Reporter: zhijiang
> Assignee: zhijiang
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.10.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> When the StreamTwoInputSelectableProcessor was introduced before, it was
> missing to add the barrier alignment metric in the constructor. But it does
> not cause problems then, because only StreamTwoInputProcessor works at that
> time.
> After StreamTwoInputProcessor is replaced by
> StreamTwoInputSelectableProcessor as now, this bug is exposed and we will not
> see the barrier alignment metric for the case of two inputs.
> The solution is to add this metric while constructing the current
> StreamTwoInputProcessor.
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