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MapReduce >> mail # user >> Re: MapReduce APIs

Mahesh Balija 2012-11-27, 05:22

I know that there is old and new API for MapReduce. The old API is found under org.apache.hadoop.mapred and the new is under org.apache.hadoop.mapreduce

I successfully used  both (the old and the new API) writing my MapReduce drivers.

The problem came up when I tried to use distributed cache. My new API Job object could not locate
public void addCacheFile<http://hadoop.apache.org/docs/current/api/src-html/org/apache/hadoop/mapreduce/Job.html#line.1016>(URI<http://download.oracle.com/javase/6/docs/api/java/net/URI.html?is-external=true> uri) method and I was scratching my head why.

What I did not reaslise is that despite new and oold API there is also Hadoop 0.20 vs Hadoop 2.0.0 APIs that use exact same packages.
 The old Hadoop.0.20.00 new Mapreduce API class Job simply doesn't have that method "addCacheFile<http://hadoop.apache.org/docs/current/api/src-html/org/apache/hadoop/mapreduce/Job.html#line.1016>(URI<http://download.oracle.com/javase/6/docs/api/java/net/URI.html?is-external=true> uri)".

I am running Hadoop 2.0.0. so could not understand why the method was not inside the class. I ended up rewriting MR job under old API mapred package and ran soccessfully.

Can anyone shed some light on this?

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Harsh J 2012-11-24, 07:21