Zakelly opened a new pull request, #24907:
URL: https://github.com/apache/flink/pull/24907
## Backporting to 1.19, See #24902
## What is the purpose of the change
See FLINK-35537, an exception thrown when setting
'state.backend.rocksdb.compression.per.level' in flink 1.19.0. I have confirmed
that the problem comes from the
`EmbeddedRocksDBStateBackend#mergeConfigurableOptions`, which merges two
configuration map into one. It uses `toString` of each already parsed value and
insert the value string into a new raw map. The `toString` gives the string
format of enum list, not the legacy yaml form of the value. The new raw map get
parsed later, that's when the error happens.
This PR fixes `EmbeddedRocksDBStateBackend#mergeConfigurableOptions`.
## Brief change log
- `EmbeddedRocksDBStateBackend#mergeConfigurableOptions`.
- Added test `testConfigureRocksDBCompressionPerLevel`
## Verifying this change
Newly added test `testConfigureRocksDBCompressionPerLevel`.
## 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
- If yes, how is the feature documented? not applicable
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