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RE: LZ4 compression support - HBase - [mail # dev]
...LZ4 is slightly faster than snappy (from my own tests) but I really doubt t hat anyone will see performance difference in HBase (or in Hadoop)  Best regards, Vladimir Rodionov Principal...
   Author: Vladimir Rodionov, 2012-02-28, 18:20
RE: LIRS cache as an alternative to LRU cache - HBase - [mail # dev]
...afaik, existing LruBlockCache is not exactly LRU cache It utilizes more advanced algorithm to avoid cache trashing during scan ops  by dividing cache into three sub-caches (for newly ad...
   Author: Vladimir Rodionov, 2012-02-21, 17:09
[expand - 1 more] - RE: Scan performance on a big table as combination of multiple logic tables - HBase - [mail # dev]
...10 tables are fine. 1000 are not, especially when one does table pre-splitt ing to increase write perf.  Too many regions kill HBase.  Best regards, Vladimir Rodionov Principal Pla...
   Author: Vladimir Rodionov, 2012-02-16, 00:11
RE: Stress testing releases candidates - HBase - [mail # dev]
...+1.  Large number of regions (> 1000) per RS + heavy load - this is what we have  in our environment (staging and productions)  Its not 0.92, of course. Its 90.4 (we just u...
   Author: Vladimir Rodionov, 2012-01-06, 18:30
[expand - 4 more] - RE: OfflineMetaRepair? - HBase - [mail # dev]
...Unfortunately, I had to delete all data (to restore data consistency :) ) ,  therefore I can say only that, from my quick investigation, all these tables were pretty old (weeks, even &n...
   Author: Vladimir Rodionov, 2012-01-06, 05:29
[expand - 3 more] - RE: -ROOT- is offline - HBase - [mail # dev]
...Thanks, It was resolved after second cluster re-start. In this case - not with kill  -9 but with manual shutdown and restart of every HBase process (including Master and ZK). stop -hbas...
   Author: Vladimir Rodionov, 2012-01-05, 04:42
0.90.4 WrongRegionException - HBase - [mail # dev]
...This is stack trace of exception we got during routine flow execution. Flow  failed.   [2011-12-30 12:32:16] (MetaScanner.java:166) - Scanning .META. starting at  row=MetaTabl...
   Author: Vladimir Rodionov, 2011-12-30, 19:50
[expand - 1 more] - RE: Extend ResultScanner API (and InternalScanner) - HBase - [mail # dev]
...Yes, my aim is to reuse scanner for multiple scans. In some cases, "multipl e" can be in order of tens of thousands. The cost of creation of 10,000 scanne rs I suppose is quite high. This is...
   Author: Vladimir Rodionov, 2011-12-23, 08:01
Raw RegionScanner? - HBase - [mail # dev]
...Question:  I have a M/R job which needs to scan HBase table in a most efficient way (a s fast as possible)  1. Data locality matters. Each map task must connect to local RS and fet...
   Author: Vladimir Rodionov, 2011-12-21, 20:19
RE: Early comparisons between 0.90 and 0.92 - HBase - [mail # dev]
...200K random reads is way -way above of what we see in production. ?  1.1M row scan - as well. 10-20K per sec max when you run 'count' from HBase  shell  Is there any magic rec...
   Author: Vladimir Rodionov, 2011-12-15, 20:11
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