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[expand - 3 more] - Re: hadoop 0.20 append - some clarifications - Hadoop - [mail # user]
...HDFS definitely doesn't follow anything like POSIX file semantics.  They may be a vague inspiration for what HDFS does, but generally the behavior of HDFS is not tightly specified. &nbs...
   Author: Ted Dunning, 2011-02-14, 16:47
Re: Which strategy is proper to run an this enviroment? - Hadoop - [mail # user]
...This sounds like it will be very inefficient.  There is considerable overhead in starting Hadoop jobs.  As you describe it, you will be starting thousands of jobs and paying this p...
   Author: Ted Dunning, 2011-02-12, 19:33
Re: Can single map-reduce solve this problem - Hadoop - [mail # user]
...mapper should produce (k,1), (1, v) for lines k,v in file1 and should produce (k,2), (2,v) for lines k,v in file2.  Your partition function should look at only the first member of the k...
   Author: Ted Dunning, 2011-02-09, 01:16
[expand - 1 more] - Re: Quick Question: LineSplit or BlockSplit - Hadoop - [mail # user]
...That is quite doable.  One way to do it is to make the max split size quite small.  On Mon, Feb 7, 2011 at 6:14 PM, Mark Kerzner  wrote:  ...
   Author: Ted Dunning, 2011-02-08, 02:28
Re: Hadoop XML Error - Hadoop - [mail # user]
...This is due to the security API not being available.  You are crossing from a cluster with security to one without and that is causing confusion.  Presumably your client assumes th...
   Author: Ted Dunning, 2011-02-08, 02:04
Re: Mappers reading from a Global inverted Index - Hadoop - [mail # user]
...That isn't going to happen.  Remember that all of the mappers are running in different JVM's on (typically) different machines.  They can't see each other.  If you want to col...
   Author: Ted Dunning, 2011-02-07, 20:04
Re: retain state between mappers - Hadoop - [mail # user]
...Remember that mappers are not executed in a well defined order.  They can be executed in different order or even at the same time.  One mapper can be run more than once.  Ther...
   Author: Ted Dunning, 2011-02-05, 20:31
Re: Hadoop-common-trunk-Commit is failing since 01/19/2011 - Hadoop - [mail # general]
...The has been a problem with more than one build failing (Mahout is the one that I saw first) due to a change in maven version which meant that the clover license isn't being found properly. ...
   Author: Ted Dunning, 2011-01-31, 21:36
Re: debugging hadoop - Hadoop - [mail # dev]
...Konstantin has good advice here, but the reader should note that "remove" should be read as "remote".  Easy typo to make, but this one changes meaning.  On Wed, Jan 26, 2011 at 12:...
   Author: Ted Dunning, 2011-01-26, 20:44
Re: Hadoop is for whom? Data architect or Java Architect or All - Hadoop - [mail # user]
...Yes.  There is still a mismatch.  The degree of mismatch is decreasing as tools like Hive or Pig become more advanced.  Better packaging of hadoop is also helping.  But y...
   Author: Ted Dunning, 2011-01-26, 16:27
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