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[HBASE-22422] Retain an ByteBuff with refCnt=0 when getBlock from LRUCache - HBase - [issue]
...After runing YCSB scan/get benchmark in our XiaoMi cluster,  we found the get QPS dropped from  25000/s to hunderds per second in a cluster with five nodes.  After enable the ...    Author: Zheng Hu , 2019-05-26, 08:22
[HBASE-21879] Read HFile's block to ByteBuffer directly instead of to byte for reducing young gc purpose - HBase - [issue]
...In HFileBlock#readBlockDataInternal,  we have the following: @VisibleForTestingprotected HFileBlock readBlockDataInternal(FSDataInputStream is, long offset,    long onDiskSize...    Author: Zheng Hu , 2019-05-25, 13:54
[HBASE-22463] Some paths in HFileScannerImpl did not consider block#release  which will exhaust the ByteBuffAllocator - HBase - [issue]
...When I debug the issue HBASE-22422,  I observed that the ByteBuffAllocator#usedBufCount will was always increasing and all direct ByteBuffers would be exhausted, which lead to may heap ...    Author: Zheng Hu , 2019-05-24, 07:57
[HBASE-22435] Add a UT to address the HFileBlock#heapSize() in TestHeapSize - HBase - [issue]
...In HBASE-22005, I added a ByteBuffAllocator reference in HFileBlock, but no increase relative heapSize in HFileBlock#heapSize(). So I guess we have no UT for the HFileBlock#heapSize(). Will ...    Author: Zheng Hu , 2019-05-22, 07:31
[HBASE-22412] Improve the metrics in ByteBuffAllocator - HBase - [issue]
...gAddress the comment in HBASE-22387: The ByteBuffAllocator#getFreeBufferCount will be O(N) complexity, because the buffers here is an ConcurrentLinkedQueue. It's worth file an issue for this...    Author: Zheng Hu , 2019-05-22, 06:41
[HBASE-20789] TestBucketCache#testCacheBlockNextBlockMetadataMissing is flaky - HBase - [issue]
...The UT failed frequently in our internal branch-2... Will dig into the UT....    Author: Zheng Hu , 2019-05-19, 06:31
[HBASE-22425] Balance shell command broken in HBase-3.0.0 - HBase - [issue]
...Please see:    Author: Zheng Hu , 2019-05-17, 07:17
[HBASE-22387] Evaluate the get/scan performance after reading HFile block into offheap directly - HBase - [issue]
...Now, all sub-tasks has been resolved now (except the HBASE-21946 because of the hadoop dependency problem), will provide some performance benckmarks to show the latency improvement....    Author: Zheng Hu , 2019-05-16, 13:45
[HBASE-21946] Replace the byte[] pread by ByteBuffer pread in HFileBlock reading once HDFS-3246 prepared - HBase - [issue]
...Sahil Takiar is working on HDFS-3246,  so now we have to keep the byte[] pread in HFileBlock reading.  Once it get resolved, we can upgrade the hadoop version and do the replacemen...    Author: Zheng Hu , 2019-05-09, 09:06
[HDFS-14483] Backport HDFS-3246 ByteBuffer pread interface to branch-2.8.x - HDFS - [issue]    Author: Zheng Hu , 2019-05-09, 09:06