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[expand - 2 more] - specify different number of mapper tasks for different machines - MapReduce - [mail # user]
...Thank you Sam, I'll give it a try.   On Mon, Aug 30, 2010 at 4:39 PM, Vitaliy Semochkin  wrote: > To say the truth I didn't understood Ted's proposal to solve  the > wiping c...
   Author: Vitaliy Semochkin , 2010-08-31, 09:42
[expand - 1 more] - Error with Heap Space. - Hadoop - [mail # user]
...sorry for being inacurate if your question is "Is the heap error due to the number of threads or more intermediate data getting generated?" when you have 30 threads running - the answer is, ...
   Author: Vitaliy Semochkin , 2010-08-16, 15:09
[expand - 1 more] - what affects number of reducers launched by hadoop? - Hadoop - [mail # user]
...mapred.tasktracker.reduce.tasks.maximum  PS I found this documet of default values very useful http://hadoop.apache.org/common/docs/r0.18.3/hadoop-default.html  however I failed to...
   Author: Vitaliy Semochkin , 2010-07-29, 11:20
what output types should Combiner use? - HDFS - [mail # user]
...Hi,  Am I right that combiners are supposed to return key/value types that reducers expect as an input?  Lets say I have map reduce operation to calculate number of different ip th...
   Author: Vitaliy Semochkin , 2010-07-25, 16:17
[expand - 3 more] - How to control the number of map tasks for each nodes? - Hadoop - [mail # user]
...On Thu, Jul 22, 2010 at 9:23 PM, Allen Wittenauer wrote:  > > On Jul 22, 2010, at 4:40 AM, Vitaliy Semochkin wrote: > >> > > If it was a context switching would the...
   Author: Vitaliy Semochkin , 2010-07-23, 12:25
Distributed Updateable Cache - Hadoop - [mail # user]
...Hi,  I need to do calculations that would benefit from storing information in distributed updateable cache. What are best practices for such things in hadoop?  PS In case there is ...
   Author: Vitaliy Semochkin , 2010-07-22, 11:56
[expand - 3 more] - hdfs system crashes when loading files bigger than local space left - HDFS - [mail # user]
...On Fri, Jul 16, 2010 at 10:07 PM, Allen Wittenauer  wrote:  > > On Jul 16, 2010, at 3:15 AM, Vitaliy Semochkin wrote: > > That is likely way too small. > > Will s...
   Author: Vitaliy Semochkin , 2010-07-21, 10:02
[expand - 1 more] - How to access Reporter in new API? - Hadoop - [mail # user]
...Thank you very much Ken.  What is the new replacement for reporter.setStatus reporter.incrCounter  and how can I access report?  Thanks in Advance, Vitaliy S   On Thu, Ju...
   Author: Vitaliy Semochkin , 2010-07-09, 07:55
[expand - 1 more] - why my Reduce Class does not work? - Hadoop - [mail # user]
...Thank you very much Ken,   The problem was with missing Generic declaration (Eclipse failed to override the method and I didn't notice mistake)  instead of public void reduce(Text ...
   Author: Vitaliy Semochkin , 2010-07-05, 08:04
Question about disk space allocation in hadoop - Hadoop - [mail # user]
...set dfs.datanode.du.reserved to amount of bytes you want to reserver for not HDFS usage.  PS for search convenience IMHO better post such questions to [EMAIL PROTECTED] ;-)   Regar...
   Author: Vitaliy Semochkin , 2010-06-30, 10:18