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  1. Sub-task HBASE-22663
    The HeapAllocationRatio in WebUI is not accurate because all of the heap allocation will happen in another separated allocator named HEAP
  2. Sub-task HBASE-22621
    Backport offheap block reading (HBASE-21879) to branch-2
  3. Sub-task HBASE-22612
    Address the final overview reviewing comments of HBASE-21879
  4. Sub-task HBASE-22598
    Deprecated the hbase.ipc.server.reservoir.initial.buffer.size & hbase.ipc.server.reservoir.initial.max for HBase2.x compatibility
  5. Sub-task HBASE-22547
    Align the config keys and add document for offheap read in HBase Book.
  6. Sub-task HBASE-22532
    There's still too much cpu wasting on validating checksum even if buffer.size=65KB
  7. Sub-task HBASE-22531
    The HFileReaderImpl#shouldUseHeap return the incorrect true when disabled BlockCache
  8. Sub-task HBASE-22504
    Optimize the MultiByteBuff#get(ByteBuffer, offset, len)
  9. Sub-task HBASE-22491
    Separate the heap HFileBlock and offheap HFileBlock because the heap block won't need refCnt and save into prevBlocks list before shipping
  10. Sub-task HBASE-22483
    It's better to use 65KB as the default buffer size in ByteBuffAllocator
  11. Sub-task HBASE-22463
    Some paths in HFileScannerImpl did not consider block#release which will exhaust the ByteBuffAllocator
  12. Sub-task HBASE-22435
    Add a UT to address the HFileBlock#heapSize() in TestHeapSize
  13. Sub-task HBASE-22422
    Retain an ByteBuff with refCnt=0 when getBlock from LRUCache
  14. Sub-task HBASE-22412
    Improve the metrics in ByteBuffAllocator
  15. Sub-task HBASE-22387
    Evaluate the get/scan performance after reading HFile block into offheap directly
  16. Sub-task HBASE-22269
    Consider simplifying the logic of BucketCache eviction.
  17. Sub-task HBASE-22211
    Remove the returnBlock method because we can just call HFileBlock#release directly
  18. Sub-task HBASE-22159
    ByteBufferIOEngine should support write off-heap ByteBuff to the bufferArray
  19. Sub-task HBASE-22127
    Ensure that the block cached in the LRUBlockCache offheap is allocated from heap
  20. Sub-task HBASE-22122
    Change to release mob hfile's block after rpc server shipped response to client
  21. Sub-task HBASE-22090
    The HFileBlock#CacheableDeserializer should pass ByteBuffAllocator to the newly created HFileBlock
  22. Sub-task HBASE-22016
    Rewrite the block reading methods by using hbase.nio.ByteBuff
  23. Sub-task HBASE-22005
    Use ByteBuff's refcnt to track the life cycle of data block
  24. Sub-task HBASE-21957
    Unify refCount of BucketEntry and refCount of hbase.nio.ByteBuff into one
  25. Sub-task HBASE-21951
    Abstract an ByteBuffOutputStream for building cell block
  26. Sub-task HBASE-21937
    Make the Compression#decompress can accept ByteBuff as input
  27. Sub-task HBASE-21921
    Notify users if the ByteBufAllocator is always allocating ByteBuffers from heap which means the increacing GC pressure
  28. Sub-task HBASE-21917
    Make the HFileBlock#validateChecksum can accept ByteBuff as an input.
  29. Sub-task HBASE-21916
    Abstract an ByteBuffAllocator to allocate/free ByteBuffer in ByteBufferPool
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