Anoop Sam John
Stephen Yuan Jiang
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[HBASE-16765] New SteppingRegionSplitPolicy, avoid too aggressive spread of regions for small tables.
...We just did some experiments on some larger clusters and found that while using IncreasingToUpperBoundRegionSplitPolicy generally works well and is very convenient, it does tend to produce t...
, 2016-11-07, 22:30
[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...
, 2016-10-07, 04:26
[HBASE-9272] A parallel, unordered scanner
...The contract of ClientScanner is to return rows in sort order. That limits the order in which region can be scanned.I propose a simple ParallelScanner that does not have this requirement and...
, 2016-08-26, 03:28
[HBASE-13094] Consider Filters that are evaluated before deletes and see delete markers
...That would be good for full control filtering of all cells, such as needed for some transaction implementations.Gary Helmling...
, 2016-08-22, 18:27
[HBASE-7010] PrefixFilter should seek to first matching row
...Currently a PrefixFilter will happily scan all KVs < prefix.If should seek forward to the prefix if the current KV < prefix....
, 2016-07-28, 05:31
[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
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