Github user markap14 commented on the issue:
https://github.com/apache/nifi/pull/2502
@alopresto This is not really for a corrupted flowfile repository but
rather for a flowfile repo that points to content that no longer exists. So the
easiest thing would be to create a GenerateFlowFile that generates at least 1
byte of data, then stop NiFi with data queued up and blow away the content
repo..... or change your nifi.properties to look at a different location for
the content repo.---
