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From "Chesnay Schepler (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-5150) WebUI metric-related resource leak
Date Wed, 23 Nov 2016 15:32:00 GMT
Chesnay Schepler created FLINK-5150:

             Summary: 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
            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

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, these metrics are still getting updated, 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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