azagrebin opened a new pull request #9747: [FLINK-13985] Use native memory for managed memory URL: https://github.com/apache/flink/pull/9747 ## What is the purpose of the change This PR introduces allocation of off-heap memory independent of direct buffers and limiting option `-XX:MaxDirectMemorySize`. This implementation uses `sun.misc.Unsafe` for that purpose. ## Brief change log - Make tests use `MemorySegmentFactory` to create `MemorySegment` and remove shorthand constructors of `HybridMemorySegment` in favour of `MemorySegmentFactory` methods. - Add allocate/release unsafe memory methods to `MemoryUtils` - Add a `MemoryUtils#createMemoryGcCleaner` to release memory in phantom reference queue upon GC of the memory owning object (based on `sun.misc.Cleaner` similar to `java.nio.DirectByteBuffer(int cap)`). - Add `MemoryUtils#wrapUnsafeMemoryWithByteBuffer` which uses the private constructor `java.nio.DirectByteBuffer(long address, int cap)` to wrap unsafe memory but w/o checking `-XX:MaxDirectMemorySize`. - Add an optional custom action to call in `HybridMemorySegment#free` for memory cleanup - Change `MemorySegmentFactory#allocateUnpooledOffHeapMemory` to allocate unsafe memory, wrap it with ByteBuffer with `MemoryUtils#wrapUnsafeMemoryWithByteBuffer`, hook a phantom reference queue cleaner upon the buffer GC and create `HybridMemorySegment` with this buffer and its custom cleaner. ## Verifying this change Units tests. ## 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: (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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