Github user JPercivall commented on the issue:
https://github.com/apache/nifi/pull/563
@olegz @ijokarumawak I don't think "Queue Buffering Max Time" is working
properly. I was getting super poor performance out of PutKafka and couldn't
understand why it would take ~5 seconds for a single message to be sent. I then
found this property and when I adjusted it lower it fixed my performance
problems (and higher according made it worse).
Looking at the property descriptor and corresponding property in Kafka
([seach for "linger.ms"](http://kafka.apache.org/documentation.html)), I would
expect it to batch multiple flowfiles but instead it just hung and only
processed one flowfile per batch. Below are a couple screenshots of the
configuration and the stats of running 3 node cluster (saw the saw phenomenon
running primary node only and the scheduling period was "0 secs"):
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