GitHub user zhangminglei opened a pull request:

    [FLINK-6160] [flip-6] Retry JobManager/ResourceManager connection in …

    ## What is the purpose of the change
    When timeout comes, retry JobManager/ResourceManager connection in case of 
    ## Brief change log
    When timeout, invoke ```requestHeartbeat``` in HeartbeatMonitor thread. Not 
directly invoke ```notifyHeartbeatTimeout``` and close the connection.
    ## Verifying this change
    This change is already covered by existing tests, but did minor changes. in 
the, change ```testHeartbeatTimeoutWithResourceManager``` 
behavior to while timeout, does not invoke ```disconnectTaskManager```.
    ## Does this pull request potentially affect one of the following parts:
      - Dependencies (does it add or upgrade a dependency): ( no)
      - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: ( no)
      - The serializers: (no)
      - The runtime per-record code paths (performance sensitive): ( don't know)
      - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no )
    ## Documentation
      - Does this pull request introduce a new feature? (no)
      - If yes, how is the feature documented? (not documented)

You can merge this pull request into a Git repository by running:

    $ git pull flink-6160

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #5440
commit 5319abdf503c757baf7afde9913ab2fb6fb61b60
Author: zhangminglei <zml13856086071@...>
Date:   2018-02-09T11:52:50Z

    [FLINK-6160] [flip-6] Retry JobManager/ResourceManager connection in case 
of timeout



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