we see the following error on UpdateAttribute processor
Failed to persist list of Peers due to java.io.IOException: All Partitions have been blacklisted due to failures when attempting to update. If the Write-Ahead Log is able to perform a checkpoint, this issue may resolve itself. Otherwise, manual intervention will be required.; if restarted and the nodes specified at the RPG are down, may be unable to transfer data until communications with those nodes are restored
With the little details provided, it sounds like this exception is related to storing the peers details returned by a Remote Process Group (RPG) fetching Site-To-Site (S2S) details from a target NiFi cluster. Did you run out of disk space on any of your local disk or on the disk of the target NiFi cluster of your RPG?
If so, did you free up space and restart your NiFi to see if the repository could checkpoint and correct the issue?