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Re: how to customize hadoop configuration for a job? - Hadoop - [mail # user]
...Hi Libo, You can implement your driver code using ToolRunner.So that you can passyour extra configuration through command line instead of editing your codeall the time.Driver codepublic...
   Author: unmesha sreeveni, 2014-04-02, 03:21
Re: error in hadoop hdfs while building the code. - Hadoop - [mail # user]
...I think it is Hadoop problem not javahttps://issues.apache.org/jira/browse/HADOOP-5396On Wed, Mar 12, 2014 at 11:37 AM, Avinash Kujur  wrote:*Thanks & Regards*Unmesha Sreeveni U.BJunior...
   Author: unmesha sreeveni, 2014-03-12, 06:11
Re: GC overhead limit exceeded - Hadoop - [mail # user]
...Try to increase the memory for datanode and see.This need to restart hadoopexport HADOOP_DATANODE_OPTS="-Xmx10g"This will set the heap to 10gbYou can also add this in start of hadoop-env.sh ...
   Author: unmesha sreeveni, 2014-03-11, 04:12
Grouping data in Reducer - Hadoop - [mail # user]
...I am doing a chaning job. And want to get the previous output values in ahashmap.My output of previous job is1 0 4.3 - 5.021 1 5.02 - 5.7399999999999991 2 5.739999999999999 - 6.4599999999999...
   Author: unmesha sreeveni, 2014-02-14, 04:49
[expand - 1 more] - Re: Binning for numerical dataset - Hadoop - [mail # user]
...To do binning in MapReduce we need to find min and max in mapper  letmapper() pass the min,max values to reducer.then after reducer calculatethe buckets.Is that the best way*Thanks & Re...
   Author: unmesha sreeveni, 2014-02-05, 06:52
Pre-processing in hadoop - Hadoop - [mail # user]
...Are we able to do preprocessing such as1.Binning2.Discretizationin hadoop.Some of the reviews are telling it is difficult.Is that right.Pls share some links that will help me alot.*Thanks & ...
   Author: unmesha sreeveni, 2014-01-30, 05:41
[expand - 4 more] - Re: Sorting a csv file - Hadoop - [mail # user]
...are we able to sort multiple columns dynamically as the user suggests? ie user requests to sort col1 and col2 then the user request to sort 3 cols I am not able to find anyof the stuff throu...
   Author: unmesha sreeveni, 2014-01-17, 10:16
Sorting in decending order - Hadoop - [mail # user]
...Are we able to sort a csv file in descending order.   *Thanks & Regards*  Unmesha Sreeveni U.B Junior Developer  http://www.unmeshasreeveni.blogspot.in/...
   Author: unmesha sreeveni, 2014-01-16, 14:28
Re: Adding file to HDFs - Hadoop - [mail # user]
...I tried to copy a 2.5 gb to hdfs. it took 3 -4 min. Are we able to reduce that time.   On Tue, Jan 14, 2014 at 3:07 PM, unmesha sreeveni wrote:    *Thanks & Regards*  Unm...
   Author: unmesha sreeveni, 2014-01-14, 18:44
Expressions in MapReduce - Hadoop - [mail # user]
...Are we able to do expresions in Mapreduce Say if i am having a csv file . which has 2 columns. The user is giving an expresion col1  + col2 = col3 Are we able to do this? And when again...
   Author: unmesha sreeveni, 2014-01-11, 18:45
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