GitHub user yanghua opened a pull request:

    https://github.com/apache/flink/pull/6028

    [FLINK-9356] Improve error message for when queryable state not ready / 
reachable

    ## What is the purpose of the change
    
    *This pull request improve error message for when queryable state not ready 
/ reachable*
    
    
    ## Brief change log
    
      - *Improve error message for when queryable state not ready / reachable*
    
    ## Verifying this change
    
    This change is a trivial rework / code cleanup without any test coverage.
    
    ## Does this pull request potentially affect one of the following parts:
    
      - Dependencies (does it add or upgrade a dependency): (yes / **no**)
      - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (yes / **no**)
      - The serializers: (yes / **no** / don't know)
      - The runtime per-record code paths (performance sensitive): (yes / 
**no** / don't know)
      - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
      - The S3 file system connector: (yes / **no** / don't know)
    
    ## Documentation
    
      - Does this pull request introduce a new feature? (yes / **no**)
      - If yes, how is the feature documented? (not applicable / docs / 
JavaDocs / **not documented**)


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

    $ git pull https://github.com/yanghua/flink FLINK-9356

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

    https://github.com/apache/flink/pull/6028.patch

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

    This closes #6028
    
----
commit 15ac42d7926be1ce0485b68f6bb23e4142fe7875
Author: yanghua <yanghua1127@...>
Date:   2018-05-17T07:18:24Z

    [FLINK-9356] Improve error message for when queryable state not ready / 
reachable

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