[jira] [Created] (AMBARI-22678) Fix Broken Symlinks on Stack Distribution

["Dmitry Lysnichenko (JIRA)" <ji...@apache.org>]

Dmitry Lysnichenko created AMBARI-22678:
-------------------------------------------

             Summary: Fix Broken Symlinks on Stack Distribution
                 Key: AMBARI-22678
                 URL: https://issues.apache.org/jira/browse/AMBARI-22678
             Project: Ambari
          Issue Type: Bug
            Reporter: Dmitry Lysnichenko
            Assignee: Dmitry Lysnichenko
            Priority: Blocker



There are two scenarios to cover here:

# Ambari never conf-select'd a component (maybe because of a bug or because the component didn't support it)
# 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:
{code}
/etc/component/conf (directory)
/usr/hdp/current/component -> /usr/hdp/v1/component
/usr/hdp/v1/component -> /etc/component/conf
{code}

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

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}}:
{code}
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
{code}






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