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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2022/07/20 07:16:16 UTC

[GitHub] [flink] TanYuxin-tyx opened a new pull request, #20315: [FLINK-28512][network] Select HashBasedDataBuffer and SortBasedDataBuffer dynamically based on the number of network buffers that can be allocated for SortMergeResultPartition

TanYuxin-tyx opened a new pull request, #20315:
URL: https://github.com/apache/flink/pull/20315

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## What is the purpose of the change

Currently, the SortMergeResultPartition selects to use HashBasedDataBuffer and SortBasedDataBuffer based on the number of required buffers per result partition decided by `taskmanager.network.sort-shuffle.min-buffers`. If the configured value is large enough, HashBasedDataBuffer will be used, otherwise, SortBasedDataBuffer will be used. Usually, the HashBasedDataBuffer has better performance. However, it is not easy to tune this value, because if a user tries to increase it for better performance, he/she is easy to encounter the 'Insufficient number of network buffers' error.

This patch improves this case by selecting HashBasedDataBuffer and SortBasedDataBuffer dynamically based on the number of network buffers that can be allocated. More specifically, if there are enough buffers at runtime, HashBasedDataBuffer will be used, otherwise, SortBasedDataBuffer will be used. To achieve better performance, the user only needs to increase the total amount of network memory per task manager.

## Brief change log

- *Select HashBasedDataBuffer and SortBasedDataBuffer dynamically based on the number of network buffers that can be allocated for SortMergeResultPartition*

## Verifying this change

This change is already covered by existing tests, such as *SortMergeResultPartitionTest, DataBufferTest*.

## 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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