StephanEwen opened a new pull request #10449: [FLINK-7289][state-backend] Integrate RocksDB memory use with managed memory URL: https://github.com/apache/flink/pull/10449 # What is the purpose of the change This PR sums up several PRs into a whole that allows users to either let RocksDB use Flink's managed memory budget, or to set a fix budget per slot which is shared between all tasks/operators. (The two are similar, in the first case the fix budget comes from the memory manager). ## Change log This PR is based on: - #10447 which adds shared resource tracking to the memory manager - #10416 which adds the use of a shared Cache and WriteBufferManager per slot - Some cleanups, simplifications, and integrations between the previous PRs. ## Follow-up This PR needs to be complemented with one further change: Releasing the handle to the shared resources when RocksDB is disposed. We plan to add this once #10300 is merged. ## Verifying this change This PR adds some unit tests. The PR can be manually verified by - setting Flink up with OFF_HEAP managed memory (it only works if all memory is OFF_HEAP, which is the only option once FLIP-49 is concluded) - Configuring RocksDB as the state backend - Setting in code (or in config) the use of managed memory (`state.backend.rocksdb.memory.managed: true`) - Enjoying a smooth running streaming program - Look for log lines like *"Getting managed memory shared cache for RocksDB."* and *"Obtained shared RocksDB cache of size {} bytes"* ## 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 / no / don't know) - The S3 file system connector: **no** ## Documentation - Does this pull request introduce a new feature? **yes** - If yes, how is the feature documented? **config options**
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