Github user dkhwangbo commented on the issue:
https://github.com/apache/nifi/pull/2696
@mattyb149 Hi. Thanks for your comment.
I already use this patch builded with Druid 0.9.2 for a week and no
abnormal operation is detected. But I think Using Druid 0.9.1 is appropriate
way because latest version of tranquility is builded against Druid 0.9.1(refer:
[tranquility 0.8.2 release
note](https://github.com/druid-io/tranquility/releases/tag/v0.8.2)).
I rollback this change. Please review.---
