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You cannot go from an upgraded 2.x NiFi instance with the same folders/state files back to NiFi 1.x. We rewrite/upgrade various things in that process including what you're seeing here which is Lucene not being able to go as far back as it was in NiFi 1.x. Across the major version upgrade that this is we've tried very hard to make upgrading as straightforward as possible but supporting downgrading with state preserved is definitely not supported. A couple possible paths: - keep moving forward with the upgrade and focus on identifying which parts need replaced components/settings changes. The validation information is helpful in this regard. - If you still have your flow config from 1.x you could try bringing up a 1.x install but with no state preserved (get rid of flowfile/content/prov/db state repositories). There are changes in things like nifi.properties and such too though and I just think going backwards having already moved forward will be tough unless you started fresh. Thanks On Tue, Apr 15, 2025 at 1:47 PM Chinthala, Bharath Chandra < c-bharathchandra.chinth...@charter.com> wrote: > Hi Team, > > I have upgraded QA to NiFi 2.3.0. > There are lot of changes on processor level. And few processors are > deprecated that need flow changes to modify the flow with alternate > processors available in this latest version. At this moment, 2.3.0 version > is unstable to use with these many changes as it intervenes data ingestion. > So, I tried reverting it back to 1.28.1 in QA. In this process, I have > upgraded the Java JDK file from 1.8 to 21. > > Since NiFi cannot be upgraded now due to lot of changes as mentioned > above, JDK version has been reverted back to 1.8. But When I am trying to > degrade NiFi back to 1.28.1, It is not reverting back. Please find the > attached screenshot. > > Could you please help me on the next steps/ how to resolve this and revert > back the NiFi to 1.28.1 in QA? > > > > > *[image: image005]* > > *Bharath Chandra *| Integration Analyst > IT Centers of Excellence > 13736 Riverport Dr., Maryland Heights, MO 63043 > The contents of this e-mail message and any attachments are intended > solely for the addressee(s) and may contain confidential and/or legally > privileged information. If you are not the intended recipient of this > message or if this message has been addressed to you in error, please > immediately alert the sender by reply e-mail and then delete this message > and any attachments. If you are not the intended recipient, you are > notified that any use, dissemination, distribution, copying, or storage of > this message or any attachment is strictly prohibited. >
