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Re: about Dave's rowlock monitor contention reduction patch... - HBase - [mail # dev]
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...Thanks for giving it a try, Andy. It's also been working well for us in production for 3 weeks now. https://issues.apache.org/jira/browse/HBASE-3894 already contains a patch for ...
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Author: Dave Latham,
2011-06-10, 22:09
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Re: How to efficiently join HBase tables? - HBase - [mail # user]
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...I believe this is what Eran is suggesting: Table A Row1 (has joinVal_1) Row2 (has joinVal_2) Row3 (has joinVal_1) Table B Row4 (has joinVal_1) Row5 (has joinVal_3) Row6 (has join...
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Author: Dave Latham,
2011-06-08, 21:35
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Re: Log4j changes not working inside static mapper and reducer classes - HBase - [mail # user]
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...I'd recommend adding -Dlog4j.debug to the JVM args for any JVM that's not giving you what you expect. In this case, if it's the map/reduce tasks, add it to mapred.child.java.opts in ma...
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Author: Dave Latham,
2011-05-25, 23:05
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Re: Mapreduce log question - HBase - [mail # user]
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...Are you using TableInputFormat? If so, if you turn on DEBUG level logging for hbase (or just org.apache.hadoop.hbase.mapreduce.TableInputFormatBase) you should see lines like this, giv...
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Author: Dave Latham,
2011-05-25, 13:18
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performance testing - HBase - [mail # dev]
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...While working on HBASE-3894 I was wondering what the best way to test performance sensitive patches to HBase was. There is the o.a.h.h.PerformanceEvaluation class, but it doesn't appea...
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Author: Dave Latham,
2011-05-25, 04:14
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Re: 0.90.3 - HBase - [mail # user]
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...Are you using the graceful_stop script? In 0.90.3 the bin/graceful_stop.sh script was updated to disable the master's balancer. However, it doesn't seem that anything re-enables ...
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Author: Dave Latham,
2011-05-24, 22:43
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Re: Release 0.90.3 soon? - HBase - [mail # dev]
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...I was one of those bitten by the connection identity changes in 0.90 and TableOutputFormat issues. I was very glad to see HBASE-3777 addressed, and many thanks to those who did the wor...
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Author: Dave Latham,
2011-05-04, 16:10
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rollback to 0.20 - HBase - [mail # user]
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...The HBase book ( http://hbase.apache.org/book/upgrading.html ) states, Does this mean that if we prevent region splits, that it would be possible to rollback to HBase 0.20.6, or are t...
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Author: Dave Latham,
2011-04-27, 18:08
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Re: intersection of row ids - HBase - [mail # user]
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...If the ordering of the row ids is the same in both tables and both are of the same order of magnitude of size, I would recommend opening scanners on both tables, then compare the current row...
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Author: Dave Latham,
2011-03-11, 17:23
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Re: [VOTE] Shall we release hbase-0.20.6 Release Candidate 1 as hbase-0.20.6? - HBase - [mail # dev]
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...For what it's worth, I've been running the 0.20 branch at r963948, which is the same as this release candidate except for https://issues.apache.org/jira/browse/HBASE-2837. Haven't had ...
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Author: Dave Latham,
2010-07-21, 16:09
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