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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5150) WebUI metric-related resource leak
Date Fri, 13 Jan 2017 10:07:26 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15821538#comment-15821538
] 

ASF GitHub Bot commented on FLINK-5150:
---------------------------------------

Github user StephanEwen commented on the issue:

    https://github.com/apache/flink/pull/3104
  
    This seems crucial, +1 to add it to 1.2 and master


> WebUI metric-related resource leak
> ----------------------------------
>
>                 Key: FLINK-5150
>                 URL: https://issues.apache.org/jira/browse/FLINK-5150
>             Project: Flink
>          Issue Type: Bug
>          Components: Webfrontend
>    Affects Versions: 1.1.3
>            Reporter: Chesnay Schepler
>            Assignee: Chesnay Schepler
>            Priority: Critical
>             Fix For: 1.2.0
>
>
> The WebUI maintains a list of selected metrics for all jobs and vertices. When a metric
is selected in the metric screen it is added to this list, and removed if it is unselected.
> The contents of this list are stored in the browser's localStorage. This allows a user
to setup a metric screen, move to another page, and return to the original screen completely
intact.
> However, if the metrics are never *unselected* by the user they will remain in this list.
They will also still be in this list if the WebUI can't even display the corresponding job
page anymore, if for example the history size limit was exceeded. They will even survive a
browser restart, since they are not stored in a session-based storage.
> Furthermore, the WebUI still tries to update these metricsd, adding additional overhead
to the WebBackend and potentially network.
> In other words, if you _ever_ checked out metrics tab for some job, chances are that
the next time you start the WebInterface it will still try to update the metrics for it.



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