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From "aitozi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-12576) inputQueueLength metric does not work for LocalInputChannels
Date Tue, 28 May 2019 15:48:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-12576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16849862#comment-16849862
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aitozi commented on FLINK-12576:
--------------------------------

Hi, [~pnowojski] I check the code, for localInputChannel do we just have to count the buffer
queued in resultsubpartition? I think the outQueueLength of localInputChannel should equal
to the inputQueueLength, right?

> inputQueueLength metric does not work for LocalInputChannels
> ------------------------------------------------------------
>
>                 Key: FLINK-12576
>                 URL: https://issues.apache.org/jira/browse/FLINK-12576
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Metrics, Runtime / Network
>    Affects Versions: 1.6.4, 1.7.2, 1.8.0
>            Reporter: Piotr Nowojski
>            Assignee: aitozi
>            Priority: Major
>
> Currently {{inputQueueLength}} ignores LocalInputChannels ({{SingleInputGate#getNumberOfQueuedBuffers}}).
This can can cause mistakes when looking for causes of back pressure (If task is back pressuring whole
Flink job, but there is a data skew and only local input channels are being used).



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