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Re: aggregation performance - HBase - [mail # user]
...I did some experiments which compares scan, coprocessor and mapreduce approach, in an ec2 environment. You may find it interesting: http://hbase-coprocessor-experiments.blogspot.com/2011/05/...
   Author: Himanshu Vashishtha, 2012-05-03, 17:08
Re: HBase Cyclic Replication Issue: some data are missing in the replication for intensive write - HBase - [mail # user]
...Yeah, I should have mentioned that: its master-master, and on cdh4b1. But, replication on that specific slave table is disabled (so, effectively its master-slave for this test).  Is thi...
   Author: Himanshu Vashishtha, 2012-05-02, 02:08
Re: HBase Replication use cases - HBase - [mail # dev]
...@Lars H: WalEdits are per transaction (aka per row). And we do ship waledits, so at the slave, it will be end of some transaction the master have seen?  Idea is that the atomicity is a ...
   Author: Himanshu Vashishtha, 2012-04-14, 00:18
Re: Coprocessor execution - HBase - [mail # user]
...Hello,  Any info about specific numbers (number of regions vs response time, etc) will help.  Btw, for rowcount, you should use FirstKeyOnlyFilter. And in your code, you should add...
   Author: Himanshu Vashishtha, 2012-03-21, 15:55
Re: Scan.addFamiliy reduces results - HBase - [mail # user]
..." Let's also say there are 1000 rows with A,B,C and 500 rows with only B an d C.  If I add families A, B and C and scan with no filter will I get 1500, 1000 or 500 results?"  In th...
   Author: Himanshu Vashishtha, 2012-03-15, 18:42
[HBASE-5486] Warn message in HTable: Stringify the byte[] - HBase - [issue]
...The warn message in the method getStartEndKeys() in HTable can be improved by stringifying the byte array for Regions.QualifierCurrently, a sample message is like :12/01/17 16:36:34 WARN cli...
http://issues.apache.org/jira/browse/HBASE-5486    Author: Himanshu Vashishtha, 2012-03-06, 01:30
HBase Replication: clarification needed - HBase - [mail # dev]
...Hello All,  I am looking at the replication functionality in HBase from the perspective of failover/failback mechanisms, i.e., fail over to a slave cluster in case the master (or primar...
   Author: Himanshu Vashishtha, 2012-02-24, 21:08
Re: AggregateProtocol Help - HBase - [mail # user]
...On Tue, Jan 3, 2012 at 11:00 AM, Ted Yu  wrote:   Yeah...And a null is returned from the Region (though the log says 0: using different variables) resulting in a npe at the client ...
   Author: Himanshu Vashishtha, 2012-01-03, 18:14
Re: Using Scans in parallel - HBase - [mail # user]
...Interesting.  Hey Bryan, can you please share the stats about: how many Regions, how many Region Servers, time taken by Serial scanner and with 8 parallel scanners.  Himanshu  ...
   Author: Himanshu Vashishtha, 2011-10-10, 02:00
Re: speeding up rowcount - HBase - [mail # user]
...MapReduce support in HBase inherently provides parallelism such that each Region is given to one mapper.  Himanshu  On Sun, Oct 9, 2011 at 6:44 PM, lars hofhansl  wrote:...
   Author: Himanshu Vashishtha, 2011-10-10, 01:05
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