Github user JPercivall commented on the pull request: https://github.com/apache/nifi/pull/183#issuecomment-176540108 When MockProcessSession.rollback(boolean)[1] is called it is, the boolean is telling the session whether or not the flowfiles should be penalized. In the event the boolean is true if the session shouldn't it clear the penalized list then add all the flowfiles to the list? [1] https://github.com/apache/nifi/blob/fd35b8ffd7d4a66ef149c1bd1341dfee3ede80c7/nifi-mock/src/main/java/org/apache/nifi/util/MockProcessSession.java#L522-L522
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