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Heterogeneous cluster - quadcores/8 cores, Fairscheduler - Hadoop - [mail # user]
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...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...
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Author: Saptarshi Guha,
2009-05-09, 14:34
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R on the cloudera hadoop ami? - Hadoop - [mail # user]
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...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...
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Author: Saptarshi Guha,
2009-04-29, 05:05
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ANN: R and Hadoop = RHIPE 0.1 - Hadoop - [mail # user]
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...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...
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Author: Saptarshi Guha,
2009-04-27, 14:15
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File name to which mapper's key,value belongs to - is it available? - Hadoop - [mail # user]
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...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...
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Author: Saptarshi Guha,
2009-04-25, 17:19
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RuntimeException, coult not obtain block causes trackers to get blacklisted - Hadoop - [mail # user]
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...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...
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Author: Saptarshi Guha,
2009-04-25, 15:00
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Re: Sometimes no map tasks are run - X are complete and N-X are pending, none running - Hadoop - [mail # user]
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...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...
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Author: Saptarshi Guha,
2009-04-17, 16:39
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Sometimes no map tasks are run - X are complete and N-X are pending, none running - Hadoop - [mail # user]
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...Hello, I'm using 0.19.2-dev-core (checked out from cvs and build). With 51 maps, i have a case where 50 tasks have completed and 1 is pending, about 1400 records left for this one to process...
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Author: Saptarshi Guha,
2009-04-17, 00:24
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Re: Is combiner and map in same JVM? - Hadoop - [mail # user]
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...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...
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Author: Saptarshi Guha,
2009-04-14, 18:10
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Is combiner and map in same JVM? - Hadoop - [mail # user]
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...Hello, Suppose I have a Hadoop job and have set my combiner to the Reducer class. Does the map function and the combiner function run in the same JVM in different threads? or in different JV...
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Author: Saptarshi Guha,
2009-04-14, 17:25
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Re: Building LZO on hadoop - Hadoop - [mail # user]
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...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 ...
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Author: Saptarshi Guha,
2009-04-01, 20:58
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