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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4441) RocksDB statebackend makes all operators appear stateful
Date Sun, 21 Aug 2016 20:05:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429881#comment-15429881

ASF GitHub Bot commented on FLINK-4441:

GitHub user gyfora opened a pull request:


    [FLINK-4441] Make RocksDB backend return null on empty state

    Thanks for contributing to Apache Flink. Before you open your pull request, please take
the following check list into consideration.
    If your changes take all of the items into account, feel free to open your pull request.
For more information and/or questions please refer to the [How To Contribute guide](http://flink.apache.org/how-to-contribute.html).
    In addition to going through the list, please provide a meaningful description of your
    - [ ] General
      - The pull request references the related JIRA issue ("[FLINK-XXX] Jira title text")
      - The pull request addresses only one issue
      - Each commit in the PR has a meaningful commit message (including the JIRA id)
    - [ ] Documentation
      - Documentation has been added for new functionality
      - Old documentation affected by the pull request has been updated
      - JavaDoc for public methods has been added
    - [ ] Tests & Build
      - Functionality added by the pull request is covered by tests
      - `mvn clean verify` has been executed successfully locally or a Travis build has passed

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

    $ git pull https://github.com/gyfora/flink FLINK-4441

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 #2399
commit d984fcf0df5a2ee5ca020d5beaec5697c437e09e
Author: Gyula Fora <gyfora@apache.org>
Date:   2016-08-21T20:01:16Z

    [FLINK-4441] Make RocksDB backend return null on empty state


> RocksDB statebackend makes all operators appear stateful
> --------------------------------------------------------
>                 Key: FLINK-4441
>                 URL: https://issues.apache.org/jira/browse/FLINK-4441
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing, Streaming
>    Affects Versions: 1.1.1
>            Reporter: Gyula Fora
>            Assignee: Gyula Fora
>            Priority: Blocker
> When the state is empty the rocks db state backend returns an empty hashmap instead of
a null in the snapshotPartitionedState method.
> This means that these operators always appear stateful to the flink runtime which makes
it impossible for instance to remove a stateless operator using the savepoints.

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