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https://issues.apache.org/jira/browse/FLINK-31655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17711909#comment-17711909
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Piotr Nowojski commented on FLINK-31655:
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I think there are ways to address problems with [~akalash] proposal, without
adding too much overhead (also checking
{{getWritingThreadTotalNumberOfSentBytes}} for the channel that we haven't
selected?). I think both of your proposed solutions would be quite costly
[~tartarus], adding extra synchronisations that we don't necessarily need with
some clever heuristic.
I agree with [~pltbkd], we would probably need a FLIP, as this will be changing
public APIs (either changing behaviour of an existing {{rebalance()}}, or
adding a new one like {{loadRebalance()}}).
> Adaptive Channel selection for partitioner
> ------------------------------------------
>
> Key: FLINK-31655
> URL: https://issues.apache.org/jira/browse/FLINK-31655
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Task
> Reporter: tartarus
> Assignee: tartarus
> Priority: Major
>
> In Flink, if the upstream and downstream operator parallelism is not the
> same, then by default the RebalancePartitioner will be used to select the
> target channel.
> In our company, users often use flink to access redis, hbase or other rpc
> services, If some of the Operators are slow to return requests (for external
> service reasons), then because Rebalance/Rescale are Round-Robin the Channel
> selection policy, so the job is easy to backpressure.
> Because the Rebalance/Rescale policy does not care which subtask the data is
> sent to downstream, so we expect Rebalance/Rescale to refer to the processing
> power of the downstream subtask when choosing a Channel.
> Send more data to the free subtask, this ensures the best possible throughput
> of job!
>
>
>
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