Hi Alex,
My knowledge of the internals of Hadoop is not great so I'll appreciate any guidance you will give me on how to improve cache usage.
For now I have added a "scoobi.DistCache" WARNING when there are no local cache files (the new cdh4/cdh3 0.8.0-SNAPSHOT versions should be published in 30 minutes or so).
If you don't have time to investigate this issue can you please open a bug, I'll look into it (when I come back from holidays because I'm off next week).
Thanks,
Eric.