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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: 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 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
Environment variable representing classpath for AM launch - Hadoop - [mail # user]
...Hi,  Is ther's any environment variable (available in all nodes of an Yarn cluster) which represents a java classpath containing all the core jars of yarn. I was thinking to use that va...
   Author: Rahul Bhattacharjee, 2013-06-18, 04:46
Re: Application errors with one disk on datanode getting filled up to 100% - Hadoop - [mail # user]
...Thanks Mayank, Any clue on why was only one disk was getting all writes.  Rahul   On Thu, Jun 13, 2013 at 11:47 AM, Mayank  wrote:  ...
   Author: Rahul Bhattacharjee, 2013-06-14, 10:34
Re: Reducer not getting called - Hadoop - [mail # user]
...The programming error is already mentioned. You are actually not overriding base classes method , rather created a new method.  Thanks, Rahul   On Thu, Jun 13, 2013 at 11:12 AM, Om...
   Author: Rahul Bhattacharjee, 2013-06-13, 13:08
Re: How to get the intermediate mapper output file name - Hadoop - [mail # user]
...Thanks Dino , good to know this.   On Mon, Jun 3, 2013 at 3:12 PM, Dino Kečo  wrote:  ...
   Author: Rahul Bhattacharjee, 2013-06-03, 09:53
Re: size of input files - Hadoop - [mail # user]
...Counters can help. Input to mr is a directory. The counters can point to the number of bytes read from that fs directory.  Rahul   On Sun, Jun 2, 2013 at 11:22 PM, Siddharth Tiwari...
   Author: Rahul Bhattacharjee, 2013-06-02, 17:56
Re: MR2 submit job help - Hadoop - [mail # user]
...Thats a warn  You might not have the users dir in hdfs.   try   hadoop fs -put sample.txt /sample.txt  Rahul   On Sat, Jun 1, 2013 at 10:07 PM, Shashidhar Rao wrote:...
   Author: Rahul Bhattacharjee, 2013-06-01, 16:57
Re: What else can be built on top of YARN. - Hadoop - [mail # user]
...Thanks a lot for the responses. I now have a better understanding.  To answer to Jay's question , I think ZK can be used as for coordination service for a distributed program (you have ...
   Author: Rahul Bhattacharjee, 2013-06-01, 07:47
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