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