wsry opened a new pull request, #22148:
URL: https://github.com/apache/flink/pull/22148
## What is the purpose of the change
Currently, the SortMergeResultPartition may allocate more network buffers
than the guaranteed size of the LocalBufferPool. As a result, some result
partitions may need to wait other result partitions to release the
over-allocated network buffers to continue. However, the result partitions
which have allocated more than guaranteed buffers relies on the processing of
input data to trigger data spilling and buffer recycling. The input data
further relies on batch reading buffers used by the
SortMergeResultPartitionReadScheduler which may already taken by those blocked
result partitions that are waiting for buffers. Then deadlock occurs. This
patch fixes the deadlock issue by reserving the guaranteed buffers on
initializing.
## Brief change log
- Reserve the guaranteed buffers on initializing for
SortMergeResultPartition.
## 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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