Xiaogang Shi created FLINK-6034:
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Summary: 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
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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