Github user jtstorck commented on the issue:
https://github.com/apache/nifi/pull/2065
+1 LGTM
Made a few minor formatting changes, and moved the spock spec from
src/test/java to src/test/groovy.
To test this, I ran a KDC and ZK server in a docker container with two
principals. I created a node using principal1 that was sasl-secured via
principal1, and used the zk migrator to export it to a json file. Then, I
manually modified the json file to change the ACL on the node I created to set
the owner to principal2. I then used the zk migrator to send the updated json
to ZK, using the --ignore-source and --use-existing-acl options. After
attempting to access the node as principal1 (which failed as expected), I was
able to access the node as princopal2 (as expected).
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