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Re: stop generating these "part-XXXX" empty files when using MultipleOutputs in mapreduce job - MapReduce - [mail # user]
...Use the LazyOutputFormat.  Have a look at this: http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/lib/output/LazyOutputFormat.html and http://stackoverflow.com/quest...
   Author: Niels Basjes, 2013-10-28, 19:31
Generating mysql or sqlite datafiles from Hadoop (Java)? - MapReduce - [mail # user]
...Hi,  I remember hearing a while ago that (if I remember correctly) Facebook had an outputformat that wrote the underlying MySQL database files directly from a MapReduce job.  For m...
   Author: Niels Basjes, 2013-09-17, 14:39
Re: Why LineRecordWriter.write(..) is synchronized - MapReduce - [mail # user]
...I expect the impact on the IO speed to be almost 0 because waiting for a single disk seek is longer than many thousands of calls to a synchronized method.  Niels On Aug 11, 2013 3:00 PM...
   Author: Niels Basjes, 2013-08-11, 16:02
Re: Is there any way to use a hdfs file as a Circular buffer? - MapReduce - [mail # user]
...A circular file on hdfs is not possible.  Some of the ways around this limitation: - Create a series of files and delete the oldest file when you have too much. - Put the data into an h...
   Author: Niels Basjes, 2013-07-24, 22:22
Re: gz containing null chars? - MapReduce - [mail # user]
...My best guess is that at a low level a string is often terminated by having a null byte at the end. Perhaps that's where the difference lies. Perhaps the gz decompressor simply stops at the ...
   Author: Niels Basjes, 2013-06-10, 20:27
Re: Experimental Hadoop Cluster - Linux Windows machines - MapReduce - [mail # user]
...I've installed CentOS on several different types of old (originally Windows XP)  Dell desktops for the last 4 years (i.e. desktops as old as 7 years ago) and so far installing CentOS wa...
   Author: Niels Basjes, 2013-06-01, 20:27
Re: Configuring SSH - is it required? for a psedo distriburted mode? - MapReduce - [mail # user]
...I never configure the ssh feature. Not for running on a single node and not for a full size cluster. I simply start all the required deamons (name/data/job/task) and configure them on which ...
   Author: Niels Basjes, 2013-05-19, 09:03
[MAPREDUCE-2094] org.apache.hadoop.mapreduce.lib.input.FileInputFormat: isSplitable implements unsafe default behaviour that is different from the documented behaviour. - MapReduce - [issue]
...When implementing a custom derivative of FileInputFormat we ran into the effect that a large Gzipped input file would be processed several times. A near 1GiB file would be processed around 3...
http://issues.apache.org/jira/browse/MAPREDUCE-2094    Author: Niels Basjes, 2013-05-03, 19:26
Re: How to process only input files containing 100% valid rows - MapReduce - [mail # user]
...How about a different approach: If you use the multiple output option you can process the valid lines in a normal way and put the invalid lines in a special separate output file. On Apr 18, ...
   Author: Niels Basjes, 2013-04-19, 08:21
Re: how to find top N values using map-reduce ? - MapReduce - [mail # user]
...My suggestion is to use secondary sort with a single reducer. That easy you can easily extract the top N. If you want to get the top N% you'll need an additional phase to determine how many ...
   Author: Niels Basjes, 2013-02-02, 12:44
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