Bulk Operation

HBASE-21879 The HeapAllocationRatio in WebUI is not accurate because all of the heap allocation will happen in another separated allocator named HEAP

HBASE-21879 Backport offheap block reading (HBASE-21879) to branch-2

HBASE-21879 Address the final overview reviewing comments of HBASE-21879

HBASE-21879 Deprecated the hbase.ipc.server.reservoir.initial.buffer.size & hbase.ipc.server.reservoir.initial.max for HBase2.x compatibility

HBASE-21879 Align the config keys and add document for offheap read in HBase Book.

HBASE-21879 There's still too much cpu wasting on validating checksum even if buffer.size=65KB

HBASE-21879 The HFileReaderImpl#shouldUseHeap return the incorrect true when disabled BlockCache

HBASE-21879 Optimize the MultiByteBuff#get(ByteBuffer, offset, len)

HBASE-21879 Separate the heap HFileBlock and offheap HFileBlock because the heap block won't need refCnt and save into prevBlocks list before shipping

HBASE-21879 It's better to use 65KB as the default buffer size in ByteBuffAllocator

HBASE-21879 Some paths in HFileScannerImpl did not consider block#release which will exhaust the ByteBuffAllocator

HBASE-21879 Add a UT to address the HFileBlock#heapSize() in TestHeapSize

HBASE-21879 Retain an ByteBuff with refCnt=0 when getBlock from LRUCache

HBASE-21879 Improve the metrics in ByteBuffAllocator

HBASE-21879 Evaluate the get/scan performance after reading HFile block into offheap directly

HBASE-21879 Consider simplifying the logic of BucketCache eviction.

HBASE-21879 Remove the returnBlock method because we can just call HFileBlock#release directly

HBASE-21879 ByteBufferIOEngine should support write off-heap ByteBuff to the bufferArray

HBASE-21879 Ensure that the block cached in the LRUBlockCache offheap is allocated from heap

HBASE-21879 Change to release mob hfile's block after rpc server shipped response to client

HBASE-21879 The HFileBlock#CacheableDeserializer should pass ByteBuffAllocator to the newly created HFileBlock

HBASE-21879 Rewrite the block reading methods by using hbase.nio.ByteBuff

HBASE-21879 Use ByteBuff's refcnt to track the life cycle of data block

HBASE-21879 Unify refCount of BucketEntry and refCount of hbase.nio.ByteBuff into one

HBASE-21879 Abstract an ByteBuffOutputStream for building cell block

HBASE-21879 Make the Compression#decompress can accept ByteBuff as input

HBASE-21879 Notify users if the ByteBufAllocator is always allocating ByteBuffers from heap which means the increacing GC pressure

HBASE-21879 Make the HFileBlock#validateChecksum can accept ByteBuff as an input.

HBASE-21879 Abstract an ByteBuffAllocator to allocate/free ByteBuffer in ByteBufferPool