[GitHub] [flink] carp84 opened a new pull request #9516: [FLINK-13815][State Backends] Implement the SpaceAllocator

[GitBox <gi...@apache.org>]

carp84 opened a new pull request #9516: [FLINK-13815][State Backends] Implement the SpaceAllocator
URL: https://github.com/apache/flink/pull/9516
 
 
   
   ## What is the purpose of the change
   
   Adding allocators for off-heap byte buffer allocation, which is required by storing state on disk.
   
   
   ## Brief change log
   
   Mainly introduces two types of buffer allocators: `DirectBucketAllocator` and `PowerTwoBucketAllocator`. The former is for relatively big data, and the latter is a simple buddy-like allocator for small data. Also assures java 9+ compatibility referring to Hadoop's [CleanerUtil](https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/CleanerUtil.java).
   
   
   ## Verifying this change
   
   This change added tests under `org.apache.flink.runtime.state.heap.space` package.
   
   ## 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? (docs)
        - Added a design doc for `PowerTwoBucketAllocator`
   

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