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MapReduce >> mail # user >> a few questions


A few questions please.

1. When I tried to run Oozie examples I was told to copy to copy /examples folder into HDFS. However when I tried to run oozie job I was told that the source file was not found. Well, until I cd'ed into the local directory on Linux and re-run the job successfully.
What was the point copying the examples into HDFS if they are started from local Linux FS.
This opens up a similar question. When I create my jobs I run .jar file from local FS and not from HDFS.  I have though that was the way. Can you actually tell hadoop where to run the MR job from: local or HDFS?

2. I noticed that Linux created group "hadoop" and adds hdfs/mapreduce user to it after the installation. However, inside HDFS the group is called "supergroup". Can someone elaborate on that?

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Matt Goeke 2012-11-09, 16:50