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Re: HBase Replication use cases - HBase - [mail # dev]
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...@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 ...
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Author: Himanshu Vashishtha,
2012-04-14, 00:18
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Re: HBase Replication use cases - HBase - [mail # dev]
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...Thank you all for replying. @JD you asked about logs for 0.90. I ran it 2 weeks back, and don't have logs atm; but you also echoed the same thing that when RS talks to ZK and there is ...
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Author: Himanshu Vashishtha,
2012-04-12, 23:17
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HBase Replication use cases - HBase - [mail # dev]
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...Hello All, I have been doing testing on the HBase replication (0.90.4, and 0.92 variants). Here are some of the findings: a) 0.90+ is not that great in handling out znode c...
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Author: Himanshu Vashishtha,
2012-04-12, 19:11
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[HBASE-5655] Cap space usage of default log4j rolling policy - HBase - [issue]
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...The current default log4j policy is to use Daily Rolling File Appender (DRFA). At times, its good to have a cap on the maximum size of the logs in order to limit its disk usage. Here is a pr...
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http://issues.apache.org/jira/browse/HBASE-5655
Author: Himanshu Vashishtha,
2012-03-31, 05:54
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Re: Coprocessor execution - HBase - [mail # user]
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...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...
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Author: Himanshu Vashishtha,
2012-03-21, 15:55
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Re: Scan.addFamiliy reduces results - HBase - [mail # user]
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..." 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...
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Author: Himanshu Vashishtha,
2012-03-15, 18:42
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[HBASE-5486] Warn message in HTable: Stringify the byte[] - HBase - [issue]
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...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...
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http://issues.apache.org/jira/browse/HBASE-5486
Author: Himanshu Vashishtha,
2012-03-06, 01:30
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HBase Replication: clarification needed - HBase - [mail # dev]
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...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...
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Author: Himanshu Vashishtha,
2012-02-24, 21:08
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Re: AggregateProtocol Help - HBase - [mail # user]
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...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 ...
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Author: Himanshu Vashishtha,
2012-01-03, 18:14
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Re: AggregateProtocol Help - HBase - [mail # user]
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...Hello Royston (and Tom), Its a bit confusing. -1 is defined in your code, and the default value (in case it was returning just default) from the RS is 0. Can you enable DEBUG at Region...
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Author: Himanshu Vashishtha,
2012-01-03, 17:11
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