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Re: A small portion of map tasks slows down the job - MapReduce - [mail # user]
...Hi,  Would reducing the output from the map tasks solve the problem ? i.e. are reducers slowing down because a lot of data is being shuffled ?  If that's the case, you could see if...
   Author: Hemanth Yamijala, 2012-10-03, 13:37
Re: How not to clean MapReduce temp data? - MapReduce - [mail # dev]
...Adding to Bejoy's response, if you want to just keep the temp output of failed tasks, you can also use keep.failed.task.files.  Also, these config variable names are as per Hadoop 1.0. ...
   Author: Hemanth Yamijala, 2012-09-28, 04:38
Re: How to output according to the key in reducer? - MapReduce - [mail # user]
...Hi,  Can you see if the MultipleOutputs class can work for you ?  ( http://hadoop.apache.org/docs/r1.0.3/api/org/apache/hadoop/mapreduce/lib/output/MultipleOutputs.html )  On ...
   Author: Hemanth Yamijala, 2012-09-17, 08:08
Re: Ignore keys while scheduling reduce jobs - MapReduce - [mail # user]
...Hi,  Does the mapper know what is the 1st point in the data set and the cluster id corresponding to it ? I don't know much about the kmeans algorithm, hence may be wrong ..  If the...
   Author: Hemanth Yamijala, 2012-09-14, 12:08
Re: What's the basic idea of pseudo-distributed Hadoop ? - MapReduce - [mail # user]
...One thing to be careful about is paths of dependent libraries or executables like streaming binaries. In pseudo distributed mode, since all processes are looking on the same machine, it is l...
   Author: Hemanth Yamijala, 2012-09-14, 08:21
Re: Configuration of hadoop.job.history.user.location on a user basis - MapReduce - [mail # user]
...Hi Bretrand,  Could you try using user.name as a property in the value of the config item ? Something like /user/${user.name}/history ?  Thanks hemanth  On Thu, Sep 13, 2012 a...
   Author: Hemanth Yamijala, 2012-09-14, 03:54
Re: how to specify the root directory of hadoop on slave node? - MapReduce - [mail # user]
...Hi Richard,  If you have installed the hadoop software on the same locations on all machines and if you have a common user on all the machines, then there should be no explicit need to ...
   Author: Hemanth Yamijala, 2012-09-12, 04:06
Re: Error in : hadoop fsck / - MapReduce - [mail # user]
...Could you please review your configuration to see if you are pointing to the right namenode address ? (This will be in core-site.xml) Please paste it here so we can look for clues.  Tha...
   Author: Hemanth Yamijala, 2012-09-11, 15:59
[MAPREDUCE-4650] Provide an ability to show task counters for a given task type in Web UI - MapReduce - [issue]
...In the Web UI for Hadoop (post YARN), there is a view that lists counter values per task for a given counter (singlejobcounter page). I found this very useful to get a consolidated view of a...
http://issues.apache.org/jira/browse/MAPREDUCE-4650    Author: Hemanth Yamijala, 2012-09-11, 12:39
Re: hadoop trunk build failure - yarn, surefire related? - MapReduce - [mail # user]
...Also, for the maven based builds, BUILDING.txt in the root folder of hadoop source does get one started.  Thanks hemanth  On Tue, Sep 11, 2012 at 4:28 PM, Harsh J  wrote: &nbs...
   Author: Hemanth Yamijala, 2012-09-11, 11:02
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