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Specifying the MR jar file - MapReduce - [mail # user]
...Hi,  What is the difference between specifying the jar file using JobConf API and the 'hadoop jar' command?  JobConf conf = new JobConf(getConf(), getClass());  bin/hadoop jar...
   Author: Praveen Sripati, 2011-10-12, 04:58
Running MRv1 jobs through Eclipse - MapReduce - [mail # dev]
...Hi,  I am trying to run MRv1 jobs in Eclipse.  I have been able to run in Local (Standalone) Mode, but not in Pseudo-Distributed Mode. In the Pseudo-Distributed Mode, the below exc...
   Author: Praveen Sripati, 2011-10-04, 10:06
[expand - 1 more] - Re: How to stop a MR Job when a certain condition is met? - MapReduce - [mail # user]
...Arun,  Let's say there is 1PB of data in HDFS and the requirement is to look for a particular sequence in the whole data. If the sequence is found then the MR job could be aborted. Ther...
   Author: Praveen Sripati, 2011-10-01, 05:06
[expand - 1 more] - Re: Regarding 'branch-0.20-security' - MapReduce - [mail # dev]
...Steve,  classes can't be backported from trunk to 0.20.x. Changes there should go into 0.22 and then into 0.20-security.  As far as I know, 0.22/0.20-security are on the old MR eng...
   Author: Praveen Sripati, 2011-09-30, 16:10
Calculations of the InputSplits - MapReduce - [mail # dev]
...Hi,  There was a query in StackOverflow regarding high CPU on the client after submitting jobs (upto 200 jobs in batch and 150MB jar file size). Calculation of the InputSplit may be one...
   Author: Praveen Sripati, 2011-09-25, 16:42
[expand - 1 more] - Re: How to pull data in the Map/Reduce functions? - MapReduce - [mail # user]
...Matt,  Neither of the books have much information about the new MR API. I was reading the 'Hadoop - The Definitive Guide' and came across a single pager on new API. I wanted to try the ...
   Author: Praveen Sripati, 2011-09-24, 16:56
[expand - 1 more] - Re: Running Hadoop in different modes - MapReduce - [mail # user]
...Harsh,  I am exploring the different features of Hadoop and have setup the Stand alone mode in Eclipse and would like to know what features it does/doesn't supports. For some reason run...
   Author: Praveen Sripati, 2011-09-23, 12:30
[expand - 2 more] - Re: Regarding FIFO scheduler - MapReduce - [mail # user]
...Thanks, got the point. So, the shuffle and sort can happen in parallel even before all the map tasks are completed, but the reduce happens only after all the map tasks are complete.  Pr...
   Author: Praveen Sripati, 2011-09-22, 13:51
Error running Hadoop in VirtualBox - MapReduce - [mail # user]
...Hi,  I have the following configuration - Ubuntu 11.04 as Guest and Host using VirtualBox and trying to run Hadoop 0.21.0. The host is acting as namenode/data node/job tracker/task trac...
   Author: Praveen Sripati, 2011-09-09, 16:34
[expand - 2 more] - Re: Build failure in map reduce trunk - MapReduce - [mail # dev]
...Tharnindu,  Execute mvn eclipse:eclipse from root and you would be able to import the projects in eclipse. Then it would be easier to browse the code easily.  Thanks, Praveen  ...
   Author: Praveen Sripati, 2011-08-28, 14:28
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