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Full table scan from random starting point? - HBase - [mail # user]
...Let's say I have one client on each of my regionservers.  Each client needsto do a full scan on the same table.  The order in which the rows arescanned by clients does not matter.I...
   Author: Robert Dyer, 2014-01-31, 22:17
Re: Get dynamic values in a user defined class from reducer. - MapReduce - [mail # user]
...Generally speaking, static fields are not useful in Hadoop.  The issue you are seeing is that the reducer is running in a separate VM (possibly on a different node!) and thus the static...
   Author: Robert Dyer, 2013-12-18, 17:39
[expand - 1 more] - Re: Uncompressed size of Sequence files - HDFS - [mail # user]
...I should probably mention my attempt to use the 'hadoop' command for this task fails (this file is fairly large, about 80GB compressed):  $ HADOOP_HEAPSIZE=3000 hadoop fs -text /path/to...
   Author: Robert Dyer, 2013-11-27, 18:34
Re: Any reference for upgrade hadoop from 1.x to 2.2 - Hadoop - [mail # user]
...Thanks Sandy! These seem helpful!  "MapReduce cluster configuration options have been split into YARN configuration options, which go in yarn-site.xml; and MapReduce configuration optio...
   Author: Robert Dyer, 2013-11-22, 15:37
[expand - 2 more] - Re: Hadoop 2.2.0 MR tasks failing - MapReduce - [mail # user]
...So does anyone have any ideas how to track this down?  Is it perhaps an exception somewhere in an output committer that is being swallowed and not showing up in the logs?  On Tue, ...
   Author: Robert Dyer, 2013-11-02, 05:46
Re: KeyValue.getLength() question - HBase - [mail # user]
...Note that the buffer may be larger than the actually used portion.  myKV.getBuffer().length gives you the length of the buffer (allocated array) myKV.getLength() gives you the length of...
   Author: Robert Dyer, 2013-09-25, 07:13
[expand - 1 more] - Re: Job status shows 0's for counters - Hadoop - [mail # user]
...Thanks all for the JIRA links.  It appears this was 'fixed' in an older JIRA... but looking at the source in my 1.2.1 webapps directory, it definitely is not fixed!  I'll comment o...
   Author: Robert Dyer, 2013-09-03, 21:14
Re: Hadoop upgrade - HDFS - [mail # user]
...Actually, 1.2.1 is out (and marked stable).  I see no reason not to upgrade.  http://hadoop.apache.org/docs/r1.2.1/releasenotes.html  As far as performance goes, when I upgrad...
   Author: Robert Dyer, 2013-08-09, 16:14
[HBASE-8856] Crash when attempting split with DelimitedKeyPrefixRegionSplitPolicy - HBase - [issue]
...I am using DelimitedKeyPrefixRegionSplitPolicy on my table.  When I attempted to split the table from the web interface, it gives the error below.I believe the problem is org.apache.had...
http://issues.apache.org/jira/browse/HBASE-8856    Author: Robert Dyer, 2013-07-11, 23:00
HDFS edit log NPE - HDFS - [mail # user]
...I recently upgraded from 1.0.4 to 1.1.2.  Now however my HDFS won't start up.  There appears to be something wrong in the edits file.  Obviously I can roll back to a previous ...
   Author: Robert Dyer, 2013-06-04, 06:12
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