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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6034) Add KeyedStateHandle for the snapshots in keyed streams
Date Thu, 23 Mar 2017 15:40:41 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15938588#comment-15938588
] 

ASF GitHub Bot commented on FLINK-6034:
---------------------------------------

Github user shixiaogang commented on the issue:

    https://github.com/apache/flink/pull/3531
  
    @StefanRRichter Thanks a lot for your comments. I have updated the pull request as suggested,
making the type of raw keyed states to be `KeyedStateHandle` as well.


> 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
>
> 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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