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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4856) Add MapState for keyed streams
Date Thu, 23 Feb 2017 16:07:46 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15880729#comment-15880729
] 

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

Github user aljoscha commented on the issue:

    https://github.com/apache/flink/pull/3336
  
    Thanks a lot for working on this @shixiaogang. ! 😃 
    
    I just merged your PR, could you please close is.


> Add MapState for keyed streams
> ------------------------------
>
>                 Key: FLINK-4856
>                 URL: https://issues.apache.org/jira/browse/FLINK-4856
>             Project: Flink
>          Issue Type: New Feature
>          Components: DataStream API, State Backends, Checkpointing
>            Reporter: Xiaogang Shi
>            Assignee: Xiaogang Shi
>             Fix For: 1.3.0
>
>
> 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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