can't compile the mapreduce project in eclipse

2011-06-14 Thread Erix Yao
hi I checked out the source code from http://svn.apache.org/repos/asf/hadoop/mapreduce/tags/release-0.21.0 and execute ant compile eclipse-files , but after import the project into eclipse, I found the error as below: Description Resource Path Location Type Project 'mapreduce' is missing requir

Questions about Fair scheduler in hadoop

2011-04-26 Thread Erix Yao
hi, I have 8 machines for the hadoop cluster, 1 namenode and 7 data node. I want the production jobs to have more priority than the user-defined jobs, so I use the Fair scheduler. Why sometimes my job scheduled by user: hadoop just start 7 map tasks, while in the cluster there's no other job runn

Re: what is the difference between the two packages "org.apache.hadoop.mapreduce"and "org.apache.hadoop.mapred"?

2011-04-26 Thread Erix Yao
Will the two packages be merged together? It's really a little confusing. 2011/4/27 Wantao > "org.apache.hadoop.mapred" is the package for old API and > "org.apache.hadoop.mapreduce" is the package for new API. Although the two > APIs have similar functionality, the implementation is different