This sounds a lot like what I'm experiencing:
http://mail-archives.apache.org/mod_mbox/nifi-issues/201808.mbox/%3cjira.13179212.1534379379000.90358.1534379760...@atlassian.jira%3E
I don't quite have the volumes but it's the same symptoms.
From: William Gosse
Sent: Saturday, May 25, 2019 12:22
I should mention that I'm on Nifi 1.9.2
From: William Gosse
Sent: Wednesday, May 29, 2019 4:04 PM
To: users@nifi.apache.org
Subject: RE: 503 Service Unavailable - Jetty Server
This sounds a lot like what I'm experiencing:
http://mail-archives.apache.org/mod_mbox/nifi-issues/201808.mbox/%3cjira