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Posted to issues@flink.apache.org by "Arvid Heise (Jira)" <ji...@apache.org> on 2020/11/06 07:05:00 UTC
[jira] [Commented] (FLINK-19533) Add state assignment to channel
state during rescaling
[ https://issues.apache.org/jira/browse/FLINK-19533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17227203#comment-17227203 ]
Arvid Heise commented on FLINK-19533:
-------------------------------------
Merged into master as a2267fa28a44c4cf4cc906859c5531c94e994bac .
> 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
>
> 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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