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https://issues.apache.org/jira/browse/FLINK-38291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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lincoln lee updated FLINK-38291:
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Affects Version/s: 2.1.0
(was: 2.1)
> Reduce thread lock overhead for Flink UI REST handlers
> ------------------------------------------------------
>
> Key: FLINK-38291
> URL: https://issues.apache.org/jira/browse/FLINK-38291
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / REST
> Affects Versions: 2.1.0
> Reporter: Yunfeng Zhou
> Assignee: Yunfeng Zhou
> Priority: Major
> Labels: pull-request-available
>
> In some of the Flink jobs in our company, we found that if the job has a
> sophisticated logic and the parallelism (number of subtasks) is about 512 or
> 1024, it may took more than one minute for the Flink UI to display the DAG of
> the job.
> Debugging into the corresponding REST handlers, we found that the latency is
> caused by repeated visits to synchronized methods like MetricStore#
> getSubtaskMetricStore. When invoking such methods, the thread might need to
> wait for other synchronized methods to release the lock before it can enter
> the method, and such overhead accumulates when the invocation is repeated.
> Thus we propose to reduce the number of visits to these synchronized methods
> to reduce the latency for DAG displaying.
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