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Re: Creation of an empty output directory in hadoop filesystem - Hadoop - [mail # user]
...Hi,Does this even compile? In the mapper the variable sum doesn't seem to bedefined?con.write(new Text(y), new IntWritable(sum));2015-01-07 13:58 GMT+01:00 Vandana kumari : ...
   Author: Dieter De Witte, 2015-01-07, 13:23
Re: Combine mapreduce result files - Hadoop - [mail # user]
...The number of part files depends on the number of reduce tasks which can betuned. So if you have a small problem you run with only one reduce task, ifit is a big problem you can run a second...
   Author: Dieter De Witte, 2014-12-28, 22:33
[expand - 2 more] - Re: Re: How many blocks does one input split have? - Hadoop - [mail # user]
...1 maptask = 1 input split, but a Mapperclass can handle multiple tasksalbeit one at a time..2014-12-18 4:54 GMT+01:00 [EMAIL PROTECTED] : ...
   Author: Dieter De Witte, 2014-12-18, 15:02
Re: Is it wrong to bypass HDFS? - Hadoop - [mail # user]
...100MB is very small, so the overhead of putting the data in hdfs is alsovery small. Does it even make sense to optimize this? (reading/writing willonly take a second or so) If you don't want...
   Author: Dieter De Witte, 2014-11-09, 19:52
Re: getting counters from specific hadoop jobs - Hadoop - [mail # user]
...Maybe you could use job -list or job -history to get a list of the jobidsand extract it from there?2014-10-23 13:32 GMT+02:00 Bart Vandewoestyne <[EMAIL PROTECTED] ...
   Author: Dieter De Witte, 2014-10-23, 12:56
Re: Replication factor affecting write performance - Hadoop - [mail # user]
...Isn't it logical that if your replication factor -> number of data nodesthat your performance will drop? Probably if repl factor approaches 18 forcluster A the write performance will drop...
   Author: Dieter De Witte, 2014-09-02, 14:26
Re: mr1 and mr2 - Hadoop - [mail # user]
...In my experience mixing APIs is probably the reason things do not work. Ifyou are using JobConf then you are not using MR1 I think. MR1 correspondsto Hadoop 1.x.x and JobConf is from Hadoop ...
   Author: Dieter De Witte, 2014-05-11, 06:56
Re: Eclipse-Plugin - Hadoop - [mail # user]
...Maybe you can install the Amazon AWS SDK, and then run EMR jobs, I thinkthese can be submitted via Eclipse but I haven't tried it myself.Regards, Dieter2014-04-06 20:44 GMT+02:00 João Paulo ...
   Author: Dieter De Witte, 2014-04-06, 18:51
Re: when it's safe to read map-reduce result? - Hadoop - [mail # user]
..._SUCCES implies that the job has succesfully terminated, so this seems likea reasonable criterion.Regards, Dieter2014-03-28 9:33 GMT+01:00 Li Li : ...
   Author: Dieter De Witte, 2014-03-28, 08:36
Re: Maps stuck on Pending - Hadoop - [mail # user]
...There's is a big chance that your map output is being copied to yourreducer, this could take quite some time if you have a lot of data andcould be resolved by:1) having more reducers2) adjus...
   Author: Dieter De Witte, 2014-03-28, 07:53
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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