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https://issues.apache.org/jira/browse/FLINK-21694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17319041#comment-17319041
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Dawid Wysakowicz commented on FLINK-21694:
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>From my point of view it is not a new feature. We haven't also started
>thorough testing so I'd be fine changing the value. However I am not able to
>judge the scope so I'll leave the final decision to the interested parties.
> Increase default value of
> "state.backend.rocksdb.checkpoint.transfer.thread.num"
> --------------------------------------------------------------------------------
>
> Key: FLINK-21694
> URL: https://issues.apache.org/jira/browse/FLINK-21694
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / State Backends
> Reporter: Stephan Ewen
> Priority: Critical
> Fix For: 1.13.0
>
>
> The default value for the number of threads used to download state artifacts
> from checkpoint storage should be increased.
> The increase should not pose risk of regression, but does in many cases speed
> up checkpoint recovery significantly.
> Something similar was reported in this blog post, item (3).
> https://engineering.contentsquare.com/2021/ten-flink-gotchas/
> A default value of 8 (eight) sounds like a good default. It should not result
> in excessive thread explosion, and already speeds up recovery.
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