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Unfortunately I had to revert the first attempt to do this because the change assumed that datasets were always stored on the local filesystem (the filesystem in src/main/resources/core-site.xml, HDFS, is not respected). The examples assume a local HDFS is running.
The simplest fix is probably to use repo:hdfs://localhost/tmp/data URIs - or perhaps we could parameterize in some way. This is not a blocker for 0.8.0 though.