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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3310) Add back pressure statistics to web frontend
Date Thu, 04 Feb 2016 14:19:39 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15132374#comment-15132374

ASF GitHub Bot commented on FLINK-3310:

Github user StephanEwen commented on the pull request:

    We can still move the tab in the UI later.
    I don't think there is a thing like "breaking changes" in the UI ;-)

> Add back pressure statistics to web frontend
> --------------------------------------------
>                 Key: FLINK-3310
>                 URL: https://issues.apache.org/jira/browse/FLINK-3310
>             Project: Flink
>          Issue Type: Improvement
>          Components: Webfrontend
>            Reporter: Ufuk Celebi
>            Assignee: Ufuk Celebi
>            Priority: Minor
> When a task is receiving data at a higher rate than it can process, the task is back
pressuring preceding tasks. Currently, there is no way to tell whether this is the case or
not. An indicator for back pressure is tasks being stuck in buffer requests on the network
stack. This means that they have filled all their buffers with data, but the following tasks/network
are not consuming them fast enough.
> A simple way to measure back pressure is to sample running tasks and report back pressure
if they are stuck in the blocking buffers calls.

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