[jira] [Created] (FLINK-19533) Add state assignment to channel state during rescaling

[Shang Yuanchun (Jira)]

Arvid Heise created FLINK-19533:
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             Summary: Add state assignment to channel state during rescaling
                 Key: FLINK-19533
                 URL: https://issues.apache.org/jira/browse/FLINK-19533
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Checkpointing
    Affects Versions: 1.12.0
            Reporter: Arvid Heise
            Assignee: Arvid Heise


Enhance StateAssignmentOperation to create a channel state mapping during rescaling, where channels before rescaling are mapped to channels after rescaling.

Example:

Before rescaling: parallelism of 2, channel 0 = key group range [0,64), channel 1 = key group range [64,128)

After rescaling: parallelism of 3, channel 0 = key group range [0,43), channel 1 = key group range [43,86), channel 2 = key group range [86,128)


Mapping: 0 -> [0, 1], 1 -> [1, 2]

 

The mapping is passed to the respective channels through deployment descriptors. It will be used in a separate ticket to restore the correct buffers from pre-rescaling channels to post-rescaling channels.



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