Github user justinleet commented on the issue:
https://github.com/apache/incubator-metron/pull/355
Removed duplicate method and moved some storm relevant items into the 'if'
block so that configs weren't used if they weren't available (i.e. during
config changes rather than install).
Tested by running up per:
https://www.evernote.com/shard/s530/sh/c5551fbd-0ac1-4861-89ce-9c5e37065c52/b13e05f39eaac1a6
After installation, I changed the parser list and the error no longer
appears. Correct parsers still spun up
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