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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 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: Question related to resource allocation in Yarn! - HDFS - [mail # user]
...Hi Devaraj,  I am on Hadoop 2.0.4 . I am able to get containers now and my yarn app runs properly. I am setting hostname as * , while requesting containers.  There is no problem as...
   Author: Rahul Bhattacharjee, 2013-09-06, 05:27
Re: Is there any way to set Reducer to output to multi-places? - HDFS - [mail # user]
...This might help  http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapred/lib/MultipleOutputFormat.html  Thanks, Rahul   On Mon, Sep 2, 2013 at 2:38 PM, Francis.Hu w...
   Author: Rahul Bhattacharjee, 2013-09-02, 09:11
Re: How Yarn execute MRv1 job? - HDFS - [mail # user]
...Thanks Arun and Devraj , good to know.    On Wed, Jun 19, 2013 at 11:24 AM, Arun C Murthy  wrote:  ...
   Author: Rahul Bhattacharjee, 2013-06-19, 10:20
Re: Application errors with one disk on datanode getting filled up to 100% - HDFS - [mail # user]
...Thanks Sandeep. Yes , thats correct , I was more interested to know about the uneven distribution within the DN.  Thanks, Rahul   On Fri, Jun 14, 2013 at 6:12 PM, Sandeep L wrote: ...
   Author: Rahul Bhattacharjee, 2013-06-14, 13:12
Re: Assigning the same partition number to the mapper output - HDFS - [mail # user]
...Some flexibility is there when it comes to changing the name of the output. Check out MultipleOutputs  Never used it with a map only job.  Thanks, Rahul   On Thu, Jun 13, 2013...
   Author: Rahul Bhattacharjee, 2013-06-14, 09:43
Re: Now give .gz file as input to the MAP - HDFS - [mail # user]
...Yeah I too found that quite slow and memory hungry !  Thanks, Rahul-da   On Wed, Jun 12, 2013 at 11:13 PM, Sanjay Subramanian  wrote:  ...
   Author: Rahul Bhattacharjee, 2013-06-12, 17:47
Re: Mapreduce using JSONObjects - HDFS - [mail # user]
...I agree with Shahab , you have to ensure that the key are writable comparable and values are writable in order to be used in MR.  You can have writable comparable implementation wrappin...
   Author: Rahul Bhattacharjee, 2013-06-05, 02:58
Re: yarn-site.xml and aux-services - HDFS - [mail # user]
...Going by what I have read ,I think its a general purpose hook of Yarn arch. to run any service in node managers. Hadoop uses this for shuffle service . Other yarn based applications might us...
   Author: Rahul Bhattacharjee, 2013-06-05, 02:55
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