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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