Chesnay Schepler created FLINK-5150:
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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 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, 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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