GitHub user StefanRRichter opened a pull request:

    [FLINK-9799] Generalize and unify state meta info snapshot

    ## What is the purpose of the change
    This PR generalizes and unifies the de/serialization of state meta 
information in backends. We replace the snapshots and reader/writers of the 
individual state types with a general `StateMetaInfoSnapshot` and the 
corresponding `StateMetaInfoSnapshotReadersWriters`. Backwards compatibility is 
    ## Verifying this change
    This change is already covered by existing tests.
    ## 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: (yes)
      - 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 

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 #6308
commit 5e44f759342793f4532e99f8df589c2416402176
Author: Stefan Richter <s.richter@...>
Date:   2018-07-11T09:11:11Z

    [FLINK-9799][state] Generalize and unify state meta infos



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