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Re: Why is Hadoop always running just 4 tasks? - MapReduce - [mail # user]
...Not sure , If I understand the question correctly. The reducers would start only after all the mappers are complete.  =Rahul   On Wed, Dec 11, 2013 at 7:59 AM, Dror, Ittay  wr...
   Author: Rahul Bhattacharjee, 2013-12-11, 16:12
Re: Folder not created using Hadoop Mapreduce code - MapReduce - [mail # user]
...it might be creating within the user directory of the user in hdfs.  trying creating something starting with a forward slash.  Thanks, Rahul   On Wed, Nov 13, 2013 at 10:40 PM...
   Author: Rahul Bhattacharjee, 2013-11-14, 06:58
Re: How to write the contents from mapper into file - HDFS - [mail # user]
...If you have a map only job , then the output of the mappers would be written by hadoop itself.  thanks, Rahul   On Wed, Nov 13, 2013 at 9:50 AM, Sahil Agarwal wrote:  ...
   Author: Rahul Bhattacharjee, 2013-11-13, 17:57
Re: How to Set No of Mappers in program - Hadoop - [mail # user]
...number of mappers depend on the number of dfs blocks you file spans across , considering standard file input formatter. unlike reducers , where you configure as how many reducers you want fo...
   Author: Rahul Bhattacharjee, 2013-11-13, 05:05
Re: File formats in Hadoop: Sequence files vs AVRO vs RC vs ORC - MapReduce - [mail # user]
...Sequence files are language neutral as Avro. Yes , but not sure about the support of other language lib for processing seq files.  Thanks, Rahul    On Mon, Sep 30, 2013 at 11:...
   Author: Rahul Bhattacharjee, 2013-09-30, 17:45
Re: How to best decide mapper output/reducer input for a huge string? - HDFS - [mail # user]
...One mapper is spawned per hbase table region. You can use the admin ui of hbase to find the number of regions per table. It might happen that all the data is sitting in a single region , so ...
   Author: Rahul Bhattacharjee, 2013-09-23, 03:14
Re: Help writing a YARN application - MapReduce - [mail # user]
...I tried something , see if this helps. Its incomplete though. https://github.com/brahul/singular  Thanks, Rahul   On Fri, Sep 20, 2013 at 11:54 PM, Pradeep Gollakota wrote:  ...
   Author: Rahul Bhattacharjee, 2013-09-21, 04:08
Re: Bzip2 vs Gzip - Hadoop - [mail # user]
...Yes , bzip2 is splittable. Tradeoffs - I have not done much experimentation with codecs.  Thanks, Rahul   On Wed, Sep 18, 2013 at 2:07 AM, Amit Sela  wrote:  ...
   Author: Rahul Bhattacharjee, 2013-09-18, 03:12
Re: MAP_INPUT_RECORDS counter in the reducer - MapReduce - [mail # user]
...Shahab,  One question - You mentioned - "In the normal configuration, the issue here is that Reducers can start before all the Maps have finished so it is not possible to get the number...
   Author: Rahul Bhattacharjee, 2013-09-18, 03:09
Re: Map JVMs not being terminated after MAP jobs complettion. - Hadoop - [mail # user]
...After the map task finishes , the VM terminates and all resources are reclaimable.  Reduces might start pulling data from completed map tasks much before all the maps are finished. Howe...
   Author: Rahul Bhattacharjee, 2013-09-13, 16:45
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