GitHub user kl0u opened a pull request:

    https://github.com/apache/flink/pull/5477

    [FLINK-8642] Initialize descriptors before use at getBroadcastState().

    ## What is the purpose of the change
    
    As the name implies, this PR fixes a bug that could lead to `NPEs` when 
trying to access the newly introduced broadcast state with not initialized 
state descriptors. This could manifest itself in the case
    where:
    
    1) scala is used and the descriptors are `lazy`
    2) the descriptors are initialized in the `open()` method of the `process 
function`.
    
    ## Brief change log
    
    The `context`s passed to the methods of the broadcast process functions now 
call `.initializeSerializerUnlessSet(...)` on the provided state descriptors.
    
    ## Verifying this change
    
    Already existing tests have been modified to trigger the new code path.
    
    ## 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): no
      - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: no
      - The S3 file system connector: no
    
    ## Documentation
    
      - Does this pull request introduce a new feature? no
      - If yes, how is the feature documented? not applicable


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

    $ git pull https://github.com/kl0u/flink broadcast-inv

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

    https://github.com/apache/flink/pull/5477.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 #5477
    
----
commit 1d08d5221ced365e643925d945ec042b44a6824f
Author: kkloudas <kkloudas@...>
Date:   2018-02-13T10:46:02Z

    [FLINK-8642] Initialize descriptors before use at getBroadcastState().

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