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[expand - 5 more] - Re: HBase reads, isolation levels and RegionScanner internal locking - HBase - [mail # dev]
...All row mutate operations in HBase are atomic: puts/deletes/increments/appends.Atomicity in HBase has the same meaning as in RDBMs exactly - operationscompletes as a whole or does not at all...
   Author: Vladimir Rodionov, 2014-09-12, 20:21
[HBASE-11898] CoprocessorHost.Environment should cache class loader instance - HBase - [issue]
...HBASE-9941 fix causes additional overhead... It looks like for every invocation it does a getClassLoader call....
http://issues.apache.org/jira/browse/HBASE-11898    Author: Vladimir Rodionov, 2014-09-05, 20:53
[HBASE-11854] MetricsRegion.updateScanNext takes 20% of overall RegionScannerImpl.nextRaw call - HBase - [issue]
...From our internal profiling we were surprised by amount of time spent in this call. Further investigation is needed....
http://issues.apache.org/jira/browse/HBASE-11854    Author: Vladimir Rodionov, 2014-09-03, 00:22
[expand - 2 more] - Re: 0.98-trunk build (pom) issue - HBase - [mail # dev]
...-Phadoop.version=2.2 worked fine to me. I was able to build package andcreate eclipse workspace. I just checked dependencies and all hadoop libsare 2.2?-Vladimir RodionovOn Thu, Aug 14, 2014...
   Author: Vladimir Rodionov, 2014-08-14, 17:52
Re: how to do parallel scanning in map reduce using hbase as input? - HBase - [mail # dev]
...I am working on improving inter-region scan performance and have the patchalready. The patch will be committed as soon as all tests are done. Thisshould improve M/R over HBase performance be...
   Author: Vladimir Rodionov, 2014-07-24, 20:24
[expand - 2 more] - Re: Strange log messages during scan operations - HBase - [mail # dev]
...OK, seems they are harmless ... but  I do not do anydeletes/writes/updates - only reads. There is a substantial delay betweenmajor compaction finish and last message in  a log file...
   Author: Vladimir Rodionov, 2014-07-15, 18:54
Re: Gathering opinions and recommendations - HBase - [mail # dev]
...Thanks, everyoneI think we will go with 0.98.2-VladimirOn Tue, May 27, 2014 at 3:41 PM, Demai Ni  wrote: ...
   Author: Vladimir Rodionov, 2014-05-27, 23:30
[expand - 1 more] - Re: On coprocessor API evolution - HBase - [mail # dev]
...Michael S.wager that when they do, it will work and not have these issues. I believethat they are writing their stuff in C/C++, if so, then they’d have anadvantage of using shared memory. &n...
   Author: Vladimir Rodionov, 2014-05-19, 19:05
Re: Comparing the performance of 0.98.2 RC0 and 0.98.0 using YCSB - HBase - [mail # dev]
...*7x EC2 c3.8xlarge: 1 master, 5 slaves, 1 test client*Andrew, I think these numbers are far from maximum you can get from thisset up. Why only 1 test client?-Vladimir RodionovOn Tue, May 6, ...
   Author: Vladimir Rodionov, 2014-05-11, 02:50
[expand - 1 more] - Re: anyone interested in openhft? - HBase - [mail # dev]
...Besides this, the implementation is very basic. The performance numbers arevery impressive, but for small objects of the  same size.On Wed, Apr 16, 2014 at 12:31 AM, Vladimir Rodionovwr...
   Author: Vladimir Rodionov, 2014-04-16, 07:37
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