hadoop-common-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Apache Wiki <wikidi...@apache.org>
Subject [Lucene-hadoop Wiki] Trivial Update of "HadoopMapReduce" by Arun C Murthy
Date Fri, 10 Aug 2007 09:26:58 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Lucene-hadoop Wiki" for change notification.

The following page has been changed by Arun C Murthy:
http://wiki.apache.org/lucene-hadoop/HadoopMapReduce

------------------------------------------------------------------------------
  passed to the configured [http://lucene.apache.org/hadoop/docs/api/org/apache/hadoop/mapred/Mapper.html
Mapper]. The user supplied Mapper does
  whatever it wants with the input pair and calls	[http://lucene.apache.org/hadoop/docs/api/org/apache/hadoop/mapred/OutputCollector.html#collect(org.apache.hadoop.io.WritableComparable,%20org.apache.hadoop.io.Writable)
OutputCollector.collect] with key-value pairs of its own choosing. The output it
  generates must use one key class and one value class.  This is because
- the Map output will be written into a [http://lucene.apache.org/hadoop/docs/api/org/apache/hadoop/io/SequenceFile.html
SequenceFile]
+ the Map output will be written into a [http://wiki.apache.org/lucene-hadoop/SequenceFile
SequenceFile]
  which has per-file type information and all the records must
  have the same type (use subclassing if you want to output
  different data structures). The Map input and output key-value

Mime
View raw message