Github user jtstorck commented on the issue:
https://github.com/apache/nifi/pull/2884
@HorizonNet I'm not familiar with the issue described in NIFI-3993, or what
scenarios cause it to happen. I did read [the referenced
JIRA](https://issues.apache.org/jira/browse/ZOOKEEPER-2044), which states that
it's a cosmetic error, so we'd need to investigate further to determine its
impact on NiFi.---
