[jira] [Commented] (FLINK-7856) Port JobVertexBackPressureHandler to REST endpoint

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-7856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16348259#comment-16348259 ] 

ASF GitHub Bot commented on FLINK-7856:
---------------------------------------

Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5397#discussion_r165290983
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/dispatcher/Dispatcher.java ---
    @@ -358,6 +361,18 @@ public void start() throws Exception {
     		}
     	}
     
    +	@Override
    +	public CompletableFuture<Optional<OperatorBackPressureStats>> getOperatorBackPressureStats(
    --- End diff --
    
    I think `Optional` is not serializable. We should always return serializable objects as the result of a RPC.


> Port JobVertexBackPressureHandler to REST endpoint
> --------------------------------------------------
>
>                 Key: FLINK-7856
>                 URL: https://issues.apache.org/jira/browse/FLINK-7856
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Distributed Coordination, REST, Webfrontend
>            Reporter: Fang Yong
>            Assignee: Gary Yao
>            Priority: Major
>
> Port JobVertexBackPressureHandler to REST endpoint



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