lincoln-lil opened a new pull request, #20531:
URL: https://github.com/apache/flink/pull/20531
## What is the purpose of the change
FLINK-28848 introduces a new LOOKUP hint to support retry both on sync and
async lookup, but the async path doesn't works because of two reasons: 1.
AsyncLookupJoinRunner has a 'stateful' resultFutureBuffer (which is very
important for performance) bind to each input record (it's non-reenter-able)
2. can not lookup new value if cache empty values enabled when chained with the
new AsyncCachingLookupFunction. So this can not be done by directly enabling
retry on 'AsyncWaitOperator', so similar to sync lookup join with retry, we fix
this by using a 'RetryableAsyncLookupFunctionDelegator' to support retry.
## Brief change log
* fix async lookup it case with retry
* add new RetryableAsyncLookupFunctionDelegator
## Verifying this change
* RetryableAsyncLookupFunctionDelegatorTest
* AsyncLookupJoinITCase
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
@Public(Evolving): (no)
- The serializers: (no )
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
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