azagrebin commented on issue #11109: [FLINK-15758][MemManager] Release segment and its unsafe memory in GC Cleaner URL: https://github.com/apache/flink/pull/11109#issuecomment-587408504 @StephanEwen Not sure, these changes are directly related to the warnings. The `HybridMemorySegment` and the GC cleaner of its unsafe memory does not strictly need `java.nio.ByteBuffer`s. It could be any other object handle (just private `Object` or `HybridMemorySegment` itself) which reference is kept in java code. We illegally use the private constructor mostly to convert the unsafe `HybridMemorySegment` to the `java.nio.ByteBuffer` API in `HybridMemorySegment#getOffHeapBuffer` and `HybridMemorySegment#wrap` for network and file IO. This is the root case. An alternative to the private constructor could be our internal implementation of `java.nio.ByteBuffer`, which could be similar to `DirectByteBuffer`.
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