Github user mattyb149 commented on the issue:
https://github.com/apache/nifi/pull/706
Per an offline discussion with @bbende, we decided a good way to handle the
outgoing flow files is to have a "success", "failure", and "retry"
relationship. If a connection / environment error occurs, the incoming flow
file will be routed to retry. Otherwise, all records put successfully to Hive
Streaming will go into an Avro record on the "success" relationship, and any
records failed to be written will go into an Avro record on the "failure"
relationship.
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