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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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Xiaogang Shi updated FLINK-6034:
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Description:
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.
was:
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.
> 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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