ASF GitHub Bot commented on FLINK-5150:

Github user zentol commented on the issue:

    Merging with the next batch.

> 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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