[jira] [Commented] (FLINK-27954) JobVertexFlameGraphHandler does not work on standby Dispatcher

["Wencong Liu (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-27954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17700638#comment-17700638 ] 

Wencong Liu commented on FLINK-27954:
-------------------------------------

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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