[AMBARI-22678] Fix Broken Symlinks on Stack Distribution

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.6.2
• Fix Version/s: 2.6.2
• Component/s: ambari-server
• Assignee: Dmitry Lysnichenko
• Reporter: Dmitry Lysnichenko
• Created: 20/Dec/17 14:25
• Updated: 26/Apr/18 22:30
• Resolved: 26/Apr/18 22:30

Description

There are two scenarios to cover here:

1. Ambari never conf-select'd a component (maybe because of a bug or because the component didn't support it)
2. The conf pointers of a component are broken

In either event, when distributing a new stack, the code detects this problem (as it would on a first-time install) and tries to fix it:

/etc/component/conf (directory)
/usr/hdp/current/component -> /usr/hdp/v1/component
/usr/hdp/v1/component -> /etc/component/conf

The stack distribution thinks this is a first-time installed and tries to fix the symlinks. We end up with:

/etc/component/conf -> /usr/hdp/current/component
/usr/hdp/current/component -> /usr/hdp/v1/component
/usr/hdp/v1/component -> /etc/component/conf
/usr/hdp/v2/component -> /etc/component/v2/0

Because we're only conf-selecting v2, v1 never gets corrected since it's already installed. Thus, we have a circular symlink.

Most likely the proper fix will be:

• Iterate over the entire known conf-select structure
• Check to see the state /etc/component/conf - if it's bad, fix it to defaults

Chances are we can do this directly in conf_select.convert_conf_directories_to_symlinks:

stack_name = Script.get_stack_name()
for directory_struct in dirs:
if not os.path.exists(directory_struct['conf_dir']):
Logger.info("Skipping the conf-select tool on {0} since {1} does not exist.".format(
package, directory_struct['conf_dir']))

return

Issue Links

• links to: review_request_