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Re: Get dynamic values in a user defined class from reducer. - MapReduce - [mail # user]
...Generally speaking, static fields are not useful in Hadoop.  The issue you are seeing is that the reducer is running in a separate VM (possibly on a different node!) and thus the static...
   Author: Robert Dyer, 2013-12-18, 17:39
Uncompressed size of Sequence files - MapReduce - [mail # user]
...Is there an easy way to get the uncompressed size of a sequence file that is block compressed?  I am using the Snappy compressor.  I realize I can obviously just decompress them to...
   Author: Robert Dyer, 2013-11-23, 21:14
[expand - 1 more] - Re: Hadoop 2.2.0 MR tasks failing - MapReduce - [mail # user]
...So does anyone have any ideas how to track this down?  Is it perhaps an exception somewhere in an output committer that is being swallowed and not showing up in the logs?  On Tue, ...
   Author: Robert Dyer, 2013-11-02, 05:46
Job status shows 0's for counters - MapReduce - [mail # user]
...I just noticed the job status for MR jobs tends to show 0's in the Map and Reduce columns but actually shows the totals correctly.  I am not sure exactly when this started happening, bu...
   Author: Robert Dyer, 2013-09-03, 18:20
Re: About configuring cluster setup - MapReduce - [mail # user]
...You can, however note that unless you also run a TaskTracker on that node (bad idea) then any blocks that are replicated to this node won't be available as input to MapReduces and you are lo...
   Author: Robert Dyer, 2013-05-14, 16:23
Job cleanup - MapReduce - [mail # user]
...What does the job cleanup task do?  My understanding was it just cleaned up any intermediate/temporary files and moved the reducer output to the output directory?  Does it do more?...
   Author: Robert Dyer, 2013-04-13, 19:35
[expand - 2 more] - Re: Slow MR time and high network utilization with all local data - MapReduce - [mail # user]
...Thanks for pointing me towards short circuit!  I dug around and couldnt find in the logs any mention of the local reader loading, and then spotted a config error.  So when I used H...
   Author: Robert Dyer, 2013-02-25, 08:17
MapFile.Reader/Writer - MapReduce - [mail # user]
...Is there a reason why MapFile.Reader/Writer constructors take a String for dirName instead of a Path?  This seems inconsistent with SequenceFile.Reader/Writer.  Also the order of a...
   Author: Robert Dyer, 2013-02-22, 04:54
[expand - 1 more] - Re: Namenode failures - MapReduce - [mail # user]
...Forgot to mention: Hadoop 1.0.4   On Sat, Feb 16, 2013 at 2:38 PM, Robert Dyer  wrote:      Robert Dyer [EMAIL PROTECTED]...
   Author: Robert Dyer, 2013-02-16, 20:39
Re: Specific HDFS tasks where is passwordless SSH is necessary - MapReduce - [mail # user]
...The JobTracker will also SSH in to start TaskTracker's.  So basically, the masters need SSH to any slave(s) you define.  The slave nodes (DN, TT) do not need SSH to each other. &nb...
   Author: Robert Dyer, 2013-02-05, 23:37
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