[jira] [Closed] (FLINK-6034) Add KeyedStateHandle for the snapshots in keyed streams

["Stefan Richter (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-6034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Richter closed FLINK-6034.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 1.3.0

Implemented in cd5527417a1cae57073a8855c6c3b88c88c780aa

> Add KeyedStateHandle for the snapshots in keyed streams
> -------------------------------------------------------
>
>                 Key: FLINK-6034
>                 URL: https://issues.apache.org/jira/browse/FLINK-6034
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing
>            Reporter: Xiaogang Shi
>            Assignee: Xiaogang Shi
>             Fix For: 1.3.0
>
>
> Currently, the only type of the snapshots in keyed streams is {{KeyGroupsStateHandle}} which is full and store the states one group after another. With the introduction of incremental checkpointing, we need a higher level abstraction of keyed snapshots to allow flexible snapshot formats. 
> The implementation of {{KeyedStateHandle}} s may vary a lot in different backends. The only information needed in {{KeyedStateHandle}} s is their key group range. When recovering the job with a different degree of parallelism, {{KeyedStateHandle}} s will be assigned to those subtasks whose key group ranges overlap with their ranges.



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