Anoop Sam John
Stephen Yuan Jiang
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[HBASE-15453] [Performance] Considering reverting HBASE-10015 - reinstate synchronized in StoreScanner
...In HBASE-10015 back then I found that intrinsic locks (synchronized) in StoreScanner are slower that explicit locks.I was surprised by this. To make sure I added a simple perf test and many ...
, 2016-07-18, 21:31
[HBASE-14549] Simplify scanner stack reset logic
...Looking at the code, I find that the logic is unnecessarily complex.We indicate in updateReaders that the scanner stack needs to be reset. Then almost all store scanner (and derived classes)...
, 2016-07-18, 21:30
[HBASE-15059] Allow 0.94 to compile against Hadoop 2.7.x
...Currently HBase 0.94 cannot be compiled against Hadoop 2.7....
, 2016-07-18, 09:23
[HBASE-5954] Allow proper fsync support for HBase
...At least get recommendation into 0.96 doc and some numbers running w/ this hdfs feature enabled....
, 2016-07-18, 09:22
[HBASE-9440] Pass blocks of KVs from HFile scanner to the StoreFileScanner and up
...Currently we read KVs from an HFileScanner one-by-one and pass them up the scanner/heap tree. Many time the ranges of KVs retrieved from StoreFileScanner (by StoreScanners) and HFileScanner ...
, 2016-07-18, 09:20
[HBASE-15881] Allow BZIP2 compression
...BZIP2 is a very efficient compressor in terms of compression rate.Compression speed is very slow, de-compression is equivalent or faster than GZIP....
, 2016-06-20, 19:44
[HBASE-6562] Fake KVs are sometimes passed to filters
...In internal tests at Salesforce we found that fake row keys sometimes are passed to filters (Filter.filterRowKey(...) specifically).The KVs are eventually filtered by the StoreScanner/ScanQu...
, 2016-06-19, 05:27
[HBASE-14869] Better request latency and size histograms
...I just discussed this with a colleague.The get, put, etc, histograms that each region server keeps are somewhat useless (depending on what you want to achieve of course), as they are aggrega...
, 2016-06-16, 23:47
[HBASE-15452] Consider removing checkScanOrder from StoreScanner.next
...In looking why we spent so much time in StoreScanner.next when doing a simple Phoenix count(*) query I came across checkScanOrder. Not only is this a function dispatch (that the JIT woul...
, 2016-03-15, 13:09
[HBASE-13082] Coarsen StoreScanner locks to RegionScanner
...Continuing where HBASE-10015 left of.We can avoid locking (and memory fencing) inside StoreScanner by deferring to the lock already held by the RegionScanner.In tests this shows quite a scan...
, 2016-03-05, 07:22
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