> > How large is the cluster? About 25 service nodes and 5 client nodes
> > Do you still have the HDP-2.1 binaries deployed? HDP-2.2 uses a different > packaging structure through versioned rpms - so the layout should not have > overwritten the earlier installations. I followed the upgrade cookbook; I’m not clear on the state of the 2.1 binaries, or how to restore the original config files. > > At a very high level you need to > * Stop any running services > * Uninstall 2.2 > * set the cluster version back to HDP-2.1 > * revert the configs back to what you have for HDP-2.1 (by applying older > versions) These details are what I was hoping to get information about (other than stopping the services). > * Start all services > > What errors do you see with HDP-2.2. We can also look at the errors and see > if configs can be modified so that 2.2 works. Lots of different problems. Hive shell hangs. Ambari start/stop operations don’t work. HBase problems finding rows in the keystone. Clients that keep trying to load from repositories other than the one I have configured. So many issues that reverting seems like the only sensible option. Brian > ________________________________________ > From: Brian Jeltema <[email protected]> > Sent: Sunday, December 20, 2015 4:35 AM > To: [email protected] > Subject: how to roll back HDP 2.1 -> HDP 2.2 upgrade > > Running Ambari 2.0.2, I tried to do an upgrade to the HDP 2.2 stack. That > upgrade > has been a disaster, and the cluster is totally screwed up. At this point I > think my best > bet is to rollback to HDP 2.1 and try again another time. > > I didn’t see a discussion of how to do a rollback. Is this documented > somewhere? > If not, can someone provide guidance? > > Thanks. > Brian
