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Posted to issues@flink.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2017/02/17 03:26:41 UTC

[jira] [Commented] (FLINK-4856) Add MapState for keyed streams

    [ https://issues.apache.org/jira/browse/FLINK-4856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15871118#comment-15871118 ] 

ASF GitHub Bot commented on FLINK-4856:
---------------------------------------

GitHub user shixiaogang opened a pull request:

    https://github.com/apache/flink/pull/3336

    [FLINK-4856][state] Add MapState in KeyedState

    1. Add `MapState` and `MapStateDescriptor`
    2. Implementation of `MapState` in `HeapKeyedStateBackend` and `RocksDBKeyedStateBackend`.
    3. Add accessors to `MapState` in `RuntimeContext`

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

    $ git pull https://github.com/alibaba/flink flink-4856

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

    https://github.com/apache/flink/pull/3336.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 #3336
    
----
commit 430b4f596acbff0a9dfdc20fbb2430a8fad819f9
Author: xiaogang.sxg <xi...@alibaba-inc.com>
Date:   2017-02-17T03:19:18Z

    Add MapState in KeyedState

----


> Add MapState for keyed streams
> ------------------------------
>
>                 Key: FLINK-4856
>                 URL: https://issues.apache.org/jira/browse/FLINK-4856
>             Project: Flink
>          Issue Type: New Feature
>          Components: State Backends, Checkpointing
>            Reporter: Xiaogang Shi
>            Assignee: Xiaogang Shi
>
> Many states in keyed streams are organized as key-value pairs. Currently, these states are implemented by storing the entire map into a ValueState or a ListState. The implementation however is very costly because all entries have to be serialized/deserialized when updating a single entry. To improve the efficiency of these states, MapStates are urgently needed. 



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