Github user justinleet commented on the issue:
https://github.com/apache/metron/pull/600
Ran up in full dev, kerberized, stopped metron, changed configs in Kafka
referencing PLAINTEXT/PLAINTEXT_SASL to SASL_PLAINTEXT (listeners and
security.inter.broker.protocol), and restarted kafka and metron. Ensured data
still ran through to ES successfully.
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