Upgrade 1.8.1->2.0 gives Stopping couchbase-serverNOTE: shutdown failed {badrpc,nodedown}

Upgrade 1.8.1->2.0 on linux gives Stopping couchbase-serverNOTE: shutdown failed

{badrpc,nodedown} at the end of the upgrade.
The data/buckets are available after upgrade.

Not clear why the installer is trying to stop the couchbase-server at the end after starting it:

Done.
Starting couchbase-server[ OK ]

You have successfully installed Couchbase Server.
Please browse to http://caper-012:8091/ to configure your server.
Please refer to http://couchbase.com for additional resources.

Please note that you have to update your firewall configuration to
allow connections to the following ports: 11211, 11210, 11209, 4369,
8091 and from 21100 to 21299.

By using this software you agree to the End User License Agreement.
See /opt/couchbase/LICENSE.txt.

Stopping couchbase-serverNOTE: shutdown failed{badrpc,nodedown}

Steps to reproduce:
(On centos linux CentOS release 5.7 (Final))
1. rm -Rf /opt/couchbase(after uninstall previous version of rpm)
2. Install 1.8.1
3. Create default/1 sasl/ 1 standard data bucket and load 10k rows each.
4. rpm -U couchbase-server-community_x86_64_2.0.0-1976-rel.rpm

The above error is shown. Complete console output and diagnostics are attached.