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Anoop Sam John
Stephen Yuan Jiang
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[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...
, 2016-06-29, 02:48
[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-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...
, 2016-03-31, 05:37
[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 ...
, 2016-03-23, 22:33
[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-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...
, 2016-03-11, 19:29
[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
[HBASE-15059] Allow 0.94 to compile against Hadoop 2.7.x
...Currently HBase 0.94 cannot be compiled against Hadoop 2.7....
, 2016-01-16, 04:52
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