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https://issues.apache.org/jira/browse/FLINK-30631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17677267#comment-17677267
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Lijie Wang commented on FLINK-30631:
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Done via master c0c7dc47905fbe80123ab0cb1ff55129acec4dab
> Limit the max number of subpartitons consumed by each downstream task
> ---------------------------------------------------------------------
>
> Key: FLINK-30631
> URL: https://issues.apache.org/jira/browse/FLINK-30631
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Coordination
> Reporter: Lijie Wang
> Assignee: Lijie Wang
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.17.0
>
>
> In the current implementation(FLINK-25035), when the upstream vertex
> parallelism is much greater than the downstream vertex parallelism, it may
> lead to a large number of channels in the downstream tasks(for example, A ->
> B, all to all edge, max parallelism is 1000. If parallelism of A is 1000,
> parallelism of B is decided to be 1, then the only subtask of B will consume
> 1000 * 1000 subpartitions), resulting in a large overhead for processing
> channels.
> In this ticket, we temporarily address this issue by limiting the max number
> of subpartitons consumed by each downstream task. The ultimate solution
> should be to support single channel consume multiple subpartitons.
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