Github user mattyb149 commented on the issue:
https://github.com/apache/nifi/pull/2575
I saw the "unable to find schema" issue in the last PR too, it seems to be
related to the onPropertyModified() method of AvroSchemaRegistry, that's where
the actual schemas get populated, but while debugging I saw that the name was
in the schema map but there was no actual schema stored. Not sure if this is a
lifecycle order-of-operations thing or not, but when I deleted the schema from
the registry, saved it, then added it back, it worked. Just some extra info
while you're pathfinding :)
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