wsry opened a new pull request, #20984:
URL: https://github.com/apache/flink/pull/20984
## What is the purpose of the change
At input gate, Flink needs exclusive buffers for each input channel. For
large parallelism jobs, it is easy to cause "Insufficient number of network
buffers" error. This ticket aims to make all input network buffers floating for
blocking shuffle to reduce the possibility of "Insufficient number of network
buffers" error. This change can also improve the default blocking shuffle
performance because buffer floating can increase the buffer utilization.
## Brief change log
- Enable input buffer floating for blocking shuffle
## Verifying this change
This change added tests.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't
know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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