Github user ottobackwards commented on the issue:
https://github.com/apache/metron/pull/729
Now that there is a feature branch there should be.
This is the commit that has grok working with hdfs, obviously based on 777.
https://github.com/ottobackwards/metron/commit/f0923a6ca4ca0cbfa5fe541311ebe20126a28bad
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