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Anoop Sam John
Stephen Yuan Jiang
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[HBASE-14613] Remove MemStoreChunkPool?
...I just stumbled across MemStoreChunkPool. The idea behind is to reuse chunks of allocations rather than letting the GC handle this.Now, it's off by default, and it seems to me to be of dubio...
, 2016-07-19, 14:33
[HBASE-16115] Missing security context in RegionObserver coprocessor when a compaction/split is triggered manually
...We ran into an interesting phenomenon which can easily render a cluster unusable.We loaded some tests data into a test table and forced a manual compaction through the UI. We have some compa...
, 2016-07-18, 23:52
[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-15431] A bunch of methods are hot and too big to be inlined
...I ran HBase with "-XX:+PrintCompilation -XX:+UnlockDiagnosticVMOptions -XX:+PrintInlining" and then looked for "hot method too big" log lines.I'll attach a log of those messages.I tried to i...
, 2016-07-18, 18:49
[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
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