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heap space error, low memory job, unit test - Hadoop - [mail # user]
...Hi guys :   I have a map/r job that has always worked fine, but which fails due to a heap space error on my local machine during unit tests.  It runs in hadoop's default mode, and ...
   Author: Jay Vyas, 2012-05-02, 00:21
EMR Hadoop - Hadoop - [mail # user]
...Hi guys :  1) Does anybody know if there is a VM out there which runs EMR hadoop ?  I would like to have a local vm for dev purposes that mirrored the EMR hadoop instances.  2...
   Author: Jay Vyas, 2012-04-30, 04:57
The meaning of FileSystem in context of OutputFormat storage - Hadoop - [mail # user]
...I just saw this line in the javadocs for OutputFormat:  "Output files are stored in a FileSystem. "  Seems like an odd sentence.  What is the implication here -- is this imply...
   Author: Jay Vyas, 2012-04-25, 15:01
Re: understanding hadoop job submission - Hadoop - [mail # user]
...Yes, the job is submitted by the api calls in map reduce code  On Wed, Apr 25, 2012 at 3:56 AM, Devaraj k  wrote:     Jay Vyas MMSB/UCHC...
   Author: Jay Vyas, 2012-04-25, 09:41
[expand - 1 more] - Re: Determine the key of Map function - Hadoop - [mail # user]
...Ahh... Well than the key will be teacher, and the value will simply be   .  Then, you will see in the reducer that the first 3 entries will always be the ones you wanted.  On ...
   Author: Jay Vyas, 2012-04-24, 03:52
Re: hadoop.tmp.dir with multiple disks - Hadoop - [mail # user]
...I don't understand why multiple disks would be particularly beneficial for a Map/Reduce job..... would I/O for a map/reduce job be i/o *as well as CPU bound* ?   I would think that simp...
   Author: Jay Vyas, 2012-04-22, 14:02
Re: FPGrowth job got stuck when running fpGrowth.generateTopKFrequentPatterns - Hadoop - [mail # user]
...Do you have counters for the reducers , and if so , are they continuing to update ?  On Tue, Apr 10, 2012 at 8:45 AM, kayhan  wrote:     Jay Vyas MMSB/UCHC...
   Author: Jay Vyas, 2012-04-10, 15:28
Re: Structuring MapReduce Jobs - Hadoop - [mail # user]
...Hi : Well phrased question .... I think you will need to read up on reducers, and then you will see the light.  1) in your mapper, emit (date,tradeValue) objects.  2) Then hadoop w...
   Author: Jay Vyas, 2012-04-09, 16:52
[expand - 1 more] - Re: map task execution time - Hadoop - [mail # user]
...(excuse the typo in the last email : I meant "I've been playing with Cinch" , not "I've been with Cinch")....  On Thu, Apr 5, 2012 at 7:54 AM, Jay Vyas  wrote:     Jay Vy...
   Author: Jay Vyas, 2012-04-05, 13:02
cloudera vs apache hadoop migration stories ? - Hadoop - [mail # user]
...Seems like cloudera and standard apache-hadoop are really not cross compatible.  Things like MultipleInputs and stuff that we are finding don't work the same.  Any good (recent) wa...
   Author: Jay Vyas, 2012-04-04, 17:15
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB