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https://issues.apache.org/jira/browse/FLINK-27954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17700638#comment-17700638
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Wencong Liu commented on FLINK-27954:
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cc [~Weijie Guo]
> JobVertexFlameGraphHandler does not work on standby Dispatcher
> --------------------------------------------------------------
>
> Key: FLINK-27954
> URL: https://issues.apache.org/jira/browse/FLINK-27954
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination, Runtime / REST
> Affects Versions: 1.15.0
> Reporter: Chesnay Schepler
> Assignee: Weijie Guo
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.17.0, 1.16.2, 1.15.5
>
>
> The {{JobVertexFlameGraphHandler}} relies internally on the
> {{JobVertexThreadInfoTracker}} which calls
> {{ResourceManagerGateway#requestTaskExecutorThreadInfoGateway}} to get a
> gateway for requesting the thread info from the task executors. Since this
> gateway is not serializable it would categorically fail if called from a
> standby dispatcher.
> Instead this should follow the logic of the {{MetricFetcherImpl}}, which
> requests addresses instead and manually connects to the task executors.
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