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Re: Improving MR job disk IO - MapReduce - [mail # user]
...There are a few reasons to use map/reduce, or just map-only or  reduce-only jobs. 1) You want to do parallel algorithms where data from multiple machines  have to be cross-checked....
   Author: Lance Norskog, 2013-10-15, 03:17
Re: Hadoop graphing tools - MapReduce - [mail # user]
...You mean a performance monitoring tool? I have not used any, but you  should search for that, not graph.  On 10/14/2013 08:03 PM, Xuri Nagarin wrote:...
   Author: Lance Norskog, 2013-10-15, 03:12
Re: how to get the mapreduce code which was pig/hive script translated to? - MapReduce - [mail # user]
...Both Pig and Hive have an 'explain plan' command that prints a schematic  version. This might make it easier to see what M/R algorithms are used.  Mostly the data goes through sing...
   Author: Lance Norskog, 2013-06-16, 23:06
Re: Mapreduce using JSONObjects - MapReduce - [mail # user]
...A side point for Hadoop experts: a comparator is used for sorting in the  shuffle. If a comparator always returns -1 for unequal objects, then  sorting will take longer than it sho...
   Author: Lance Norskog, 2013-06-07, 17:16
Re: Copy Vs DistCP - MapReduce - [mail # user]
...Shell 'cp' only works if you use 'fuse', which makes the HDFS file  system visible as a Unix mounted file system. Otherwise, Unix programs  cannot read or write HDFS files.  O...
   Author: Lance Norskog, 2013-04-12, 17:15
Re: MapReduce on Local files - MapReduce - [mail # user]
...Everything in a directory tree. No exceptions. I hope it does not follow  symbolic links or file system mounts.  On 04/02/2013 04:46 AM, Mohammad Tariq wrote:  ...
   Author: Lance Norskog, 2013-04-05, 03:59
[MAPREDUCE-2208] Flexible CSV text parser InputFormat - MapReduce - [issue]
...CSVTextInputFormat is a configurable CSV parser tuned to most of the csv-style datasets I've found. The Hadoop samples I've seen all FileInputFormat and Mapper<LongWritable,Text>. They...
http://issues.apache.org/jira/browse/MAPREDUCE-2208    Author: Lance Norskog, 2013-03-20, 18:58
Re: Encryption in HDFS - MapReduce - [mail # user]
...Excellent!  On 02/25/2013 10:43 PM, Mathias Herberts wrote:...
   Author: Lance Norskog, 2013-02-28, 00:26
Re: What should I do with a 48-node cluster - MapReduce - [mail # user]
...You will also be raided by the DEA- too much power for a residence.  On 12/20/2012 07:56 AM, Ted Dunning wrote:  ...
   Author: Lance Norskog, 2012-12-21, 19:37
Re: Virtual memory problems on Ubuntu 12.04 (a.k.a. MALLOC_ARENA_MAX or HADOOP-7154) - MapReduce - [mail # user]
...1) Java uses different variables than 'malloc'. Look up 'Java garbage collection' to find out how it all works.  2) Is this a 32-bit kernel? Or Java version? Those top out at 2.1g addre...
   Author: Lance Norskog, 2012-10-27, 01:45
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