[GitHub] [flink] klion26 opened a new pull request #8751: [FLINK-11937][StateBackend]Resolve small file problem in RocksDB incremental checkpoint

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klion26 opened a new pull request #8751: [FLINK-11937][StateBackend]Resolve small file problem in RocksDB incremental checkpoint
URL: https://github.com/apache/flink/pull/8751
 
 
   ## What is the purpose of the change
   
   This pr wants to fix the problem of too many small files in RocksDB incremental checkpoint.
   
   - commit 027658cc8b introduces some components to support this feature
   - commit f9de491436 add some tests for the newly introduced components
   - commit 95ffded0a8 add a statehandle type in SavepoitnV2Serializer
   - commit 0fa18e426e add parameter `checkpointId` for `CheckpointStreamFactory#createChecpointStateOutputStream`
   - commit 3220941f9b Replace the `getSharedStateHandleIDs` function with `getSharedState`
   - commit 40edc349dc Enable FSCSOS for RocksDBStateBackend
   - commit bdc84604ce Add tests for FSCSOS (mainly added tests in `SharedStateRegistryTest` and tests in `RocksDBStateBackendTest`)
   - commit 73dbcc1309 rebase the newly master branch
   
   ## Brief change log
   
   This pr introduces some necessary classes, such as
   - FsSegmentCheckpointStorage
   - FsCheckpointStreamFactory
   - FsSegmentCheckpointStorageLocation
   - FsSegmentCheckpointStreamFactory
   - FsSegmentStateBackend
   - FsSegmentStateHandle
   This pr modifies some exist classes to support this feature, such as:
   - SharedStateRegistry
   - RocksDBStateBackend
   and add some tests to verify the correct.
   
   ## Verifying this change
   This pr introduces some test and modified some exist test to verify the changes.
   - SharedStateRegistryTest
   - RocksDBStateBackendTest
   - FsSegmentCheckpointStorageTest
   - FsSegmentCheckpointStorageTest.java
   - FsSegmentStateBackendEntropyTest.java
   - FsSegmentStateHandleTest.java
   - RocksDBSegmentStateBackendFactoryTest.java
   - SavepointV2SerializerTest.java
   
   
   ## 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, Yarn/Mesos, ZooKeeper: (**yes**)
     - The S3 file system connector: (**no**)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (**yes**)
     - If yes, how is the feature documented? (**JavaDocs**)
   

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