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Posted to issues@flink.apache.org by "Aljoscha Krettek (JIRA)" <ji...@apache.org> on 2017/02/17 09:48:41 UTC

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

     [ https://issues.apache.org/jira/browse/FLINK-4856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek updated FLINK-4856:
------------------------------------
    Component/s: DataStream API

> 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
>
> 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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