The patch to follow removes some unused fields. I've been setting up Eclipse to work on Avro (patch forthcoming), and Eclipse is perhaps unreasonably whiny about these things, but there were so few, that it seemed harmless to fix them.
DataFileReader had a "count" field, which was never read (only assigned), so I've deleted it.
Several classes had LOG fields that were never used; I deleted them.
TestCompare had a handful of unused imports; just deleted them.