Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/30#issuecomment-41592426
@sryza We dug around a little more and realized it's a file permissions
issue. On the CDH cluster, if I ran the application as the user `ubuntu` then
it fails. However, if we ran the application as `root`, then it succeeds. This
is because the jar in the file cache on the executor nodes have very
restrictive permissions (`-r-x------ 1 yarn`). Instead of throwing a message
about permissions, it simply says `No module named pyspark`.
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