Github user mosermw commented on the issue: https://github.com/apache/nifi/pull/2487 I tested this and I was able to switch back and forth between MinimalLockingWriteAheadLog and SequentialAccessWriteAheadLog. +1 from me. It's best to make this switch while there are 0 flowfiles in the repository. With flowfiles in the system, going from MinimalLockingWAL to SequantialAccessWAL worked, but the opposite had some issues.
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