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https://issues.apache.org/jira/browse/FLINK-19533?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arvid Heise resolved FLINK-19533.
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Fix Version/s: 1.12.0
Resolution: Fixed
> 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
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> 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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