Description of problem: GlusteFileSystem.getFileBlockLocations(Path p, long start, long len) is an empty method. This method signature does not exist within the FileSystem or the DistributedFileSystem class and thus does not appear to be called anywhere currently. It looks like it can be deleted.
Fixed here: https://github.com/gluster/hadoop-glusterfs/pull/22
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=927290