[jira] [Commented] (FLINK-14712) Improve back-pressure reporting mechanism

["Piotr Nowojski (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-14712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974955#comment-16974955 ] 

Piotr Nowojski commented on FLINK-14712:
----------------------------------------

Thanks! Would you like to be assigned to all of the tickets?

> Improve back-pressure reporting mechanism
> -----------------------------------------
>
>                 Key: FLINK-14712
>                 URL: https://issues.apache.org/jira/browse/FLINK-14712
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / Metrics, Runtime / Network, Runtime / REST
>            Reporter: lining
>            Assignee: lining
>            Priority: Major
>         Attachments: image-2019-11-12-14-30-16-130.png
>
>
> h4. (1) The current monitor is heavy-weight. 
>  *   Backpressure monitoring works by repeatedly taking stack trace samples of your running tasks.
> h4. (2) It is difficult to find out which vertex is the source  of  backpressure.
>  * User need to know current and upstream's network metric to judge current whether is the source of backpressure. Now user has to record relevant information.
> h3. Proposed Changes
> 1. expose the new mechanism implemented in FLINK-14472 as a "is back-pressured" metric.
> 2. show the vertex that produces the backpressure source for the job.
> 3. expose network pool usage in IOMetricsInfo:
>  # if sub task is not back pressured, but it is causing a back pressure (full input, empty output)
>  # by comparing exclusive/floating buffers usage, whether all channels are back-pressured or only some of them
> {code:java}
> public final class IOMetricsInfo {
>     private final float outPoolUsage;
>     private final float inputExclusiveBuffersUsage;
>     private final float inputFloatingBuffersUsage;
> }
> {code}
> JobDetailsInfo.JobVertexDetailsInfo merge use Math.max.(ps: outPoolUsage is from upstream)



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