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[HBASE-6072] Make TableRecordReaderImpl more easily extended - HBase - [issue]
...We have a MR job that is very memory bound.  It reads a potentially large row from hbase, then deserializes it into an (even larger) object representation, then does a fair amount of co...
http://issues.apache.org/jira/browse/HBASE-6072    Author: Dave Latham, 2012-05-23, 17:29
[HBASE-1996] Configure scanner buffer in bytes instead of number of rows - HBase - [issue]
...Currently, the default scanner fetches a single row at a time.  This makes for very slow scans on tables where the rows are not large.  You can change the setting for an HTable ins...
http://issues.apache.org/jira/browse/HBASE-1996    Author: Dave Latham, 2012-05-05, 00:58
Re: ANN: HBase 0.92.0 is available for download - HBase - [mail # user]
...Woohoo!  Many thanks to everyone who contributed to this big release.  One of HBase's biggest strengths is its community.  Stack, the link to the upgrade guide doesn't seem to...
   Author: Dave Latham, 2012-01-24, 00:09
Re: corrupt WAL and Java Heap Space... - HBase - [mail # user]
...We just hit the same issue.  I attached log snippets from the regionserver and master into https://issues.apache.org/jira/browse/HBASE-4107  I was able to get the log file out of h...
   Author: Dave Latham, 2011-08-26, 16:44
Re: about Dave's rowlock monitor contention reduction patch... - HBase - [mail # dev]
...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 ...
   Author: Dave Latham, 2011-06-10, 22:09
Re: How to efficiently join HBase tables? - HBase - [mail # user]
...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...
   Author: Dave Latham, 2011-06-08, 21:35
Re: Log4j changes not working inside static mapper and reducer classes - HBase - [mail # user]
...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...
   Author: Dave Latham, 2011-05-25, 23:05
Re: Mapreduce log question - HBase - [mail # user]
...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...
   Author: Dave Latham, 2011-05-25, 13:18
performance testing - HBase - [mail # dev]
...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...
   Author: Dave Latham, 2011-05-25, 04:14
Re: 0.90.3 - HBase - [mail # user]
...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 ...
   Author: Dave Latham, 2011-05-24, 22:43
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