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

[Shang Yuanchun (Jira)]

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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