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Re: Configuring SSH - is it required? for a psedo distriburted mode? - MapReduce - [mail # user]
...The scrits themselves will use ssh to connect to every machine (even localhost). It's up to you if you want to type the password everytime. For a pseudo-distributed system, I don't see the i...
   Author: Bertrand Dechoux, 2013-05-17, 11:15
Re: Submitting a hadoop job in large clusters. - MapReduce - [mail # user]
...Which doesn't imply that you should log yourself to the physical machine where the JobTracker is hosted. It only implies that the hadoop client must be able to reach the JobTracker. It could...
   Author: Bertrand Dechoux, 2013-05-12, 20:02
[expand - 1 more] - Re: why multiple checkpoint nodes? - MapReduce - [mail # user]
...For more information : https://issues.apache.org/jira/browse/HADOOP-7297  It has been corrected but the stable documentation is still the 1.0.4 (previous to correction).  See * htt...
   Author: Bertrand Dechoux, 2013-04-18, 20:05
Re: Using Hadoop for codec functionality - MapReduce - [mail # user]
...Your question could be interpreted in another way : should I use Hadoop in order to perform massive compression/decompression using my own (eventually, proprietary) utility?  So yes, Ha...
   Author: Bertrand Dechoux, 2013-03-31, 09:38
Re: Which hadoop installation should I use on ubuntu server? - MapReduce - [mail # user]
...For information, the 50 node limit on CDH is a past limitation. It is no longer the case.  *Support for unlimited nodes*. Previous versions of Cloudera Manager Free  https://ccp.cl...
   Author: Bertrand Dechoux, 2013-03-29, 10:10
Re: disk used percentage is not symmetric on datanodes (balancer) - MapReduce - [mail # user]
...Hi,  It is not explicitly said but did you use the balancer? http://hadoop.apache.org/docs/r1.0.4/commands_manual.html#balancer  Regards  Bertrand  On Mon, Mar 18, 2013 a...
   Author: Bertrand Dechoux, 2013-03-18, 21:43
Re: Replication factor - MapReduce - [mail # user]
...The best way would be to test it. The provided links indeed do not seem to help.  I would say the default replication factor is the one found in the configuration and it can be overwrit...
   Author: Bertrand Dechoux, 2013-03-17, 18:07
Re: queues in haddop - MapReduce - [mail # user]
...There is also kafka. http://kafka.apache.org "A high-throughput, distributed, publish-subscribe messaging system."  But it does not push into HDFS, you need to launch a job to pull data...
   Author: Bertrand Dechoux, 2013-01-11, 13:03
Re: What is the preferred way to pass a small number of configuration parameters to a mapper or reducer - MapReduce - [mail # user]
...*G*. Use cascading so that way you don't have to actually provide the parameters yourself because there is a transparent serialization of what will become the mapper and the reducer. (but it...
   Author: Bertrand Dechoux, 2012-12-31, 08:17
Re: Multi-stage map/reduce jobs - MapReduce - [mail # user]
...I will second Harsh about JobControl.  It is indeed not the role of Hadoop to provide a full workflow engine in its core but JobControl allows you to define a graph of dependent jobs an...
   Author: Bertrand Dechoux, 2012-11-24, 11:56
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