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Re: error:Type mismatch in value from map - Hadoop - [mail # user]
...If you want to use a combiner, your map has to output the same types as your combiner outputs. In your case, modify your map to look like this:   ┬ápublic static class TokenizerMapper &n...
   Author: Joey Echeverria, 2011-07-29, 14:49
Re: Hadoop Question - Hadoop - [mail # user]
...How about having the slave write to temp file first, then move it to the fil e the master is monitoring for after they close it?  -Joey    On Jul 27, 2011, at 22:51, Nitin Kha...
   Author: Joey Echeverria, 2011-07-28, 12:22
[expand - 1 more] - Re: questions regarding data storage and inputformat - Hadoop - [mail # user]
...You could either use a custom RecordReader or you could override the run() method on your Mapper class to do the merging before calling the map() method.  -Joey  On Wed, Jul 27, 20...
   Author: Joey Echeverria, 2011-07-27, 20:40
Re: Running queries using index on HDFS - Hadoop - [mail # user]
...To add to what Bobby said, you can get block locations with fs.getFileBlockLocations() if you want to open based on locality.  -Joey  On Mon, Jul 25, 2011 at 3:00 PM, Robert Evans ...
   Author: Joey Echeverria, 2011-07-25, 23:15
Re: Hadoop-streaming with a c binary executable as a mapper - Hadoop - [mail # user]
...Your executable needs to read lines from standard in. Try setting your mappe r like this:   If that doesn't work, you may need to execute your C program from a shell sc ript. The -I add...
   Author: Joey Echeverria, 2011-07-22, 15:34
Re: Where to find best documentation for setting up kerberos authentication in - Hadoop - [mail # user]
...Hi Issac,  I couldn't find anything specifically for the 0.20.203 release, but CDH3 uses basically the same security code. You could probably follow our security guide with the 0.20.203...
   Author: Joey Echeverria, 2011-07-18, 20:26
Re: replicate data in HDFS with smarter encoding - Hadoop - [mail # user]
...Facebook contributed some code to do something similar called HDFS RAID:  http://wiki.apache.org/hadoop/HDFS-RAID  -Joey   On Jul 18, 2011, at 3:41, Da Zheng  wrote: &nbs...
   Author: Joey Echeverria, 2011-07-18, 11:10
Re: FW: type mismatch error - Hadoop - [mail # user]
...Your map method is misnamed. It should be in all lower case.  -Joey On Jul 12, 2011 2:46 AM, "Teng, James"  wrote: run, however encountered an exception while continue going furthe...
   Author: Joey Echeverria, 2011-07-12, 13:15
[expand - 1 more] - Re: Cluster Tuning - Hadoop - [mail # user]
...Set mapred.reduce.slowstart.completed.maps to a number close to 1.0. 1.0 means the maps have to completely finish before the reduce starts copying any data. I often run jobs with this set to...
   Author: Joey Echeverria, 2011-07-08, 16:14
Re: HTTP Error - Hadoop - [mail # user]
...It looks like both datanodes are trying to serve data out of the smae direct ory. Is there any chance that both datanodes are using the same NFS mount fo r the dfs.data.dir?  If not, wh...
   Author: Joey Echeverria, 2011-07-08, 11:55
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