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Tutorial on building an AMI - Hadoop - [mail # user]
...Hello, Is there a tutorial available to build an Hadoop AMI (like Cloudera's)? Cloudera has an 18.2 ami and for reasons I understand they can't provide(as of now) AMIs for higher Hadoop vers...
   Author: Saptarshi Guha, 2009-05-22, 18:11
[expand - 1 more] - Re: No reduce tasks running, yet 1 is pending - Hadoop - [mail # user]
...Interestingly, when i started other jobs, this one finished. I have no idea why.  Saptarshi Guha    On Tue, May 12, 2009 at 10:36 PM, Saptarshi Guha  wrote:...
   Author: Saptarshi Guha, 2009-05-13, 02:51
Heterogeneous cluster - quadcores/8 cores, Fairscheduler - Hadoop - [mail # user]
...Hello, Our unit has 5 quad-core machines, running Hadoop. We have a dedicated Jobtracker/Namenode. Each machine has 32GB ram. We have the option of buying an 8 core,128GB machine and the que...
   Author: Saptarshi Guha, 2009-05-09, 14:34
R on the cloudera hadoop ami? - Hadoop - [mail # user]
...Hello, Thank you to Cloudera for providing an AMI for Hadoop. Would it be possible to include R in the Cloudera yum repositories or better still can the i386 and x86-64 AMIs be updated to ha...
   Author: Saptarshi Guha, 2009-04-29, 05:05
ANN: R and Hadoop = RHIPE 0.1 - Hadoop - [mail # user]
...Hello, I'd like to announce the release of the 0.1 version of RHIPE -R and Hadoop Integrated Processing Environment. Using RHIPE, it is possible to write map-reduce algorithms using the R la...
   Author: Saptarshi Guha, 2009-04-27, 14:15
File name to which mapper's key,value belongs to - is it available? - Hadoop - [mail # user]
...Hello, Is there a conf variable for getting the filename to which the current mapper's key,value belongs to? I have dir/dirA/part-X and dir/dirB/part-X i will process dir, but need to know w...
   Author: Saptarshi Guha, 2009-04-25, 17:19
RuntimeException, coult not obtain block causes trackers to get blacklisted - Hadoop - [mail # user]
...Hello, I have an intensive job running across 5 machines. During the map stage, each map emits 200 records, so effectively for 50,000,000 input reords, the map creates 200*50e6 records. &nbs...
   Author: Saptarshi Guha, 2009-04-25, 15:00
[expand - 1 more] - Re: Sometimes no map tasks are run - X are complete and N-X are pending, none running - Hadoop - [mail # user]
...I forgot to examine logs, I will next time it happens. Thank you BW, no maps are running. Only few are pending and the rest are complete. Saptarshi Guha   On Fri, Apr 17, 2009 at 3:06 A...
   Author: Saptarshi Guha, 2009-04-17, 16:39
[expand - 1 more] - Re: Is combiner and map in same JVM? - Hadoop - [mail # user]
...Thanks. I am using 0.19, and to confirm, the map and combiner (in the map jvm) are run in *different* threads at the same time? My native library is not thread safe, so I would have to imple...
   Author: Saptarshi Guha, 2009-04-14, 18:10
[expand - 2 more] - Re: Building LZO on hadoop - Hadoop - [mail # user]
...Actually, if one installs the latest liblzo and sets CFLAGS, LDFLAGS and LFLAGS correctly, things work fine. Saptarshi Guha    On Wed, Apr 1, 2009 at 3:55 PM, Saptarshi Guha  ...
   Author: Saptarshi Guha, 2009-04-01, 20:58
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