Github user joewitt commented on a diff in the pull request:
https://github.com/apache/nifi/pull/430#discussion_r63237500
--- Diff:
nifi-api/src/main/java/org/apache/nifi/processor/ProcessSession.java ---
@@ -109,6 +109,19 @@
void rollback(boolean penalize);
/**
+ * Produces a listing of pertinent information about the session's
+ * unacknowledged flowfiles that can be used for logging purposes. If
the
+ * session fails for any reason this can help identify problem files
with
+ * minimal system impact.
+ *
+ * Because of testing dependencies and ot
+ *
+ * @return {@link String} listing pertinent information about the
session's
+ * unacknowledged flowfiles, primarily intended for logging purposes.
+ */
+ String getUnacknowledgedFlowfileInfo();
--- End diff --
When a session gets rolled back everything not committed (even things
already transferred but not committed) are part of the list. Also once a
session is rolled back or committed it should generally be able to be used
more. Therefore the information about the session you want to capture needs to
come back as a return of the rollback call itself most likely.
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