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Re: How to send KV pair to a reduce task on a particular machine? - Hadoop - [mail # general]
...Yanfeng,  The sort of behavior you want is intentionally omitted from MapReduce's capabilities. Reduce partitions are kept as abstract notions and your MapReduce program cannot bind par...
   Author: Aaron Kimball, 2010-03-22, 03:06
Re: Sqoop Installation on Apache Hadop 0.20.2 - Hadoop - [mail # user]
...Hi Utku,  Apache Hadoop 0.20 cannot support Sqoop as-is. Sqoop makes use of the DataDrivenDBInputFormat (among other APIs) which are not shipped with Apache's 0.20 release. In order to ...
   Author: Aaron Kimball, 2010-03-18, 00:01
Re: CombineFileInputFormat in 0.20.2 version - Hadoop - [mail # user]
...The most obvious workaround is to use the old API (continue to use Mapper, Reducer, etc. from org.apache.hadoop.mapred, not .mapreduce).  If you really want to use the new API, though, ...
   Author: Aaron Kimball, 2010-03-16, 17:34
Re: Unexpected termination of a job - Hadoop - [mail # user]
...If it's terminating before you even run a job, then you're in luck -- it's all still running on the local machine. Try running it in Eclipse and use the debugger to trace its execution. &nbs...
   Author: Aaron Kimball, 2010-03-03, 20:55
Re: Separate mail list for streaming? - Hadoop - [mail # user]
...We've already got a lot of mailing lists :) If you send questions to mapreduce-user, are you not getting enough feedback?  - Aaron  On Wed, Mar 3, 2010 at 12:09 PM, Michael Kintzer...
   Author: Aaron Kimball, 2010-03-03, 20:51
Re: dataset - Hadoop - [mail # user]
...Look at implementing your own Partitioner implementation to control which records are sent to which reduce shards.  - Aaron  On Wed, Mar 3, 2010 at 12:15 PM, Gang Luo  wrote: ...
   Author: Aaron Kimball, 2010-03-03, 20:50
Re: Release plans - Hadoop - [mail # general]
...+1 from me.  I agree with Stack; faster release cycles will help keep the project focused and get code testing and soaking in more environments.  - Aaron  On Fri, Feb 19, 2010...
   Author: Aaron Kimball, 2010-02-19, 21:48
Re: Why is $JAVA_HOME/lib/tools.jar in the classpath? - Hadoop - [mail # user]
...Thomas,  What version of Hadoop are you building Debian packages for? If you're taking Cloudera's existing debs and modifying them, these include a backport of Sqoop (from Apache's trun...
   Author: Aaron Kimball, 2010-02-17, 19:41
Re: mapred.system.dir - Hadoop - [mail # user]
...To expand on Eric's comment: dfs.data.dir is the local filesystem directory (or directories) that a particular datanode uses to store its slice of the HDFS data blocks.  so dfs.data.dir...
   Author: Aaron Kimball, 2010-02-13, 01:14
Re: Ubuntu Single Node Tutorial failure. No live or dead nodes. - Hadoop - [mail # user]
...Sonal,  Can I ask why you're sleeping between starting hdfs and mapreduce? I've never needed this in my own code. In general, Hadoop is pretty tolerant about starting daemons "out of or...
   Author: Aaron Kimball, 2010-02-13, 01:10
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