Github user justinleet commented on the issue:
https://github.com/apache/incubator-metron/pull/488
@dlyle65535 Failure mode is that HDFS writes from Storm fail. The
directories are owned by metron:metron with 775. Storm isn't in the metron
group, so it fails to write. The perms exception is thrown in the bolt and no
output file is created. Writes to ES work as expected. Validating this is
pretty easy, just run up full dev and see if the perms error shows up and if
HDFS gets any files.
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