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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
RE: Suspected memory leak - HBase - [mail # dev]
...You can create several heap dumps of JVM process in question and compare heap allocations To create heap dump:  jmap pid  To analize: 1. jhat 2. visualvm 3. any commercial profiler...
   Author: Vladimir Rodionov, 2011-12-01, 06:22
[expand - 6 more] - RE: HBase 0.90.4 missing data in production - HBase - [mail # dev]
...There are no ERRORs and FATALs in Region Servers logs except one FATAL I ha ve already posted. HLog sync I am asking expert advise: what else should I check?   Best regards, Vladimir Ro...
   Author: Vladimir Rodionov, 2011-11-04, 21:47
[expand - 1 more] - RE: HBASE-4107 and OOME - HBase - [mail # dev]
...Yes, mslab is enabled. It allocates 2M per region, by default? It can expla in 2.4G of heap usage (1277 regions) We fixed OOME by increasing Heap to 8G. Now I know that we can decrease sla b...
   Author: Vladimir Rodionov, 2011-10-31, 00:53
[expand - 3 more] - RE: Random I/O performance - HBase - [mail # dev]
...Great  Why is nobody using it?  Best regards, Vladimir Rodionov Principal Platform Engineer Carrier IQ, www.carrieriq.com e-mail: [EMAIL PROTECTED]  __________________________...
   Author: Vladimir Rodionov, 2011-10-26, 23:31
[expand - 1 more] - RE: SILT - nice keyvalue store paper - HBase - [mail # dev]
...There is nothing crazy with async I/O. Netty (which I presume is underlying  network library in a latest Hadoop) is totally async.  You can run 1000, 10,000 and may be more threads...
   Author: Vladimir Rodionov, 2011-10-24, 20:21
[expand - 1 more] - RE: HBase releases... - HBase - [mail # dev]
...Jonathan, to make your community happier could you (your company)  contribu te all Facebook's internal patches to 0.92?  I apologize to everyone who think that I was rude in my pre...
   Author: Vladimir Rodionov, 2011-10-14, 17:42
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