GitHub user StefanRRichter opened a pull request:

    https://github.com/apache/flink/pull/3200

    [FLINK-5602] migration namespace serializer

    This PR fixes FLINK-5602. We introduce an artificial namespace serializer 
instead of `null` so that checkpoints can run even before the user states are 
registered.
    
    This sits on top of PR #3198 .

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

    $ git pull https://github.com/StefanRRichter/flink 
FLINK-5602-MigrationNamespaceSerializer

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

    https://github.com/apache/flink/pull/3200.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 #3200
    
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commit a30466009e0431aa884f7d358ecb2f386d4feb01
Author: Stefan Richter <[email protected]>
Date:   2017-01-19T17:08:02Z

    [FLINK-5626] Improved resource deallocation in RocksDBKeyedStateBackend

commit 39fee85f4f05598949929ecb577bd7fd31dd0d10
Author: Stefan Richter <[email protected]>
Date:   2017-01-24T13:27:18Z

    review comments

commit 49d374f02aec698e672cc98db81049f51e1ba5fc
Author: Stefan Richter <[email protected]>
Date:   2017-01-24T13:35:42Z

    [FLINK-5602] Introduce artifical namespace serializer for migration

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