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[expand - 1 more] - Re: Can I switch the IP/host of NN without losing the filesystem? - MapReduce - [mail # user]
...Thank everybody for the responses.  James  On Mon, Jan 7, 2013 at 12:49 PM, Robert Molina wrote:  ...
   Author: Jianhui Zhang, 2013-01-07, 22:30
NameNode uses up (almost) all ports - MapReduce - [mail # user]
...Hi folks,  We've got this weird problem regularly on our NameNode (apache hadoop-0.20.205.0) - every couple of weeks:  The JobTracker had this error:  2012-10-08 11:44:03,928 ...
   Author: Jianhui Zhang, 2012-10-29, 04:51
How to get mapper counters (or equivalents) in reducer - MapReduce - [mail # user]
...Hi folks,  Version: Hadoop 0.20.205.  My reducer can be optimized if I can get a good estimate on how many records are produced by the mappers, that is, if I can get the MAP_OUTPUT...
   Author: Jianhui Zhang, 2012-04-30, 19:02
MR output to a file instead of directory? - MapReduce - [mail # user]
...Hi all,  The FileOutputFormat/FileOutputCommitter always treats an output path as a directory and write files under it, even if there is only one Reducer. Is there any way to configure ...
   Author: Jianhui Zhang, 2012-03-03, 00:38
anyway to do "local" reduce like the combiner does? - MapReduce - [mail # user]
... I have a problem at hand that seems to need "local" reducing:     I have a large data input, in which each line is a data mapping, somethi ng like "name : attribute". The att...
   Author: Jianhui Zhang, 2012-01-29, 08:06
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB