Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/1686
@YolandaMDavis Thanks Yolanda.
During most of my testing, I did clear the repositories between application
starts when switching the implementation (`rm -rf provenance_repository/
content_repository/ flowfile_repository/` from `$NIFI_HOME/conf`). I did run
tests (at the time) where I left the repository intact (in each direction) and
my notes are:
```
-Verified switching from encrypted prov repo to plain will not allow access
to previously-written events
-Error in app log
-Suppress stacktrace?
-App still starts
-UI error dialog on prov query
-New provenance events overwrite previous
-New prov queries work
-Verified switching from plain prov repo to encrypted will not allow
access to previously-written events
-Error in app log
-Suppress stacktrace?
-App still starts
-UI error dialog on prov query
-New provenance events overwrite previous
-New prov queries work
```
I will re-evaluate those scenarios as soon as I finish reviewing PR 1712
for Bryan.
I do think suppressing the stacktrace and providing a more descriptive
error is a good idea and will tackle that as well. If it is determined there is
a simple reason your queries were not working, great. If not, adding
documentation instructing repository removal may be necessary.
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