Github user okram commented on the pull request:
https://github.com/apache/incubator-tinkerpop/commit/b2ef5a369684903086e4c10b81cfbc47ff80f6bd#commitcomment-13968894
This is necessary for Giraph. If you don't have an output format, where
does the data go before MapReduce... Nowhere so MapReduce throws exceptions.
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