Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1145
@jongyoul
Regarding `Prefix Not found`,
Thought it was coming from this PR but found that `Prefix Not found`
message looks like coming after ca27bf5c11ad29070eb392f04ea4867d992313fa.
Previously, in the same situation, `sql interpreter not found` was printed.
The difference is, previously, ZeppelinServer (InterpreterFactory,
NoteReplLoader) decide which interpreter to load and print `sql interpreter not
found`. After ca27bf5c11ad29070eb392f04ea4867d992313fa, it starts jdbc
interpreter and jdbc interpreter prints it.
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