[AMBARI-12778] RU: Downgrade Fails For All Components From Finalize

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.1.1
• Component/s: ambari-server

Environment

HDP 2.2 to 2.3 (Downgrade after finalize)

• Assignee: Jonathan Hurley
• Reporter: Jonathan Hurley
• Created: 15/Aug/15 03:59
• Updated: 17/Aug/15 05:51
• Resolved: 17/Aug/15 04:01

Description

When downgrading a rolling upgrade from HDP 2.3 back to HDP 2.2, all components will fail with:

 Fail("Applying %s failed, looped symbolic links found while resolving %s" % (self.resource, path))

resource_management.core.exceptions.Fail: Applying Directory['/usr/hdp/current/flume-server/conf'] failed, looped symbolic links found while resolving /usr/hdp/current/flume-server/conf

The problem is that Ambari changes /etc/component/conf from a directory to a symlink when upgrading to HDP 2.3 from HDP 2.2. During the downgrade, once the component is put back in HDP 2.2, the following is observed:

[root@c6401 flume]# ls -l /etc/flume
total 8
drwxr-xr-x 3 root  root 4096 Aug 14 15:44 2.3.2.0-2586
lrwxrwxrwx 1 root  root   34 Aug 14 16:14 conf -> /usr/hdp/current/flume-server/conf
drwxr-xr-x 2 flume root 4096 Aug 14 15:42 conf.backup

(/usr/hdp/2.2.7.0-2816/flume/)
[root@c6401 flume]# ls -l /usr/hdp/current/flume-server/conf
total 16
drwxr-xr-x 2 root root 4096 Aug 14 15:42 bin
lrwxrwxrwx 1 root root   15 Aug 14 15:42 conf -> /etc/flume/conf
drwxr-xr-x 9 root root 4096 Aug 14 15:42 docs
drwxr-xr-x 2 root root 4096 Aug 14 15:42 lib
drwxr-xr-x 2 root root 4096 Aug 14 15:42 tools