[jira] [Created] (AMBARI-15864) Re-Upgrade from 2.2 to 2.3+ Fails Due To Circular Symlink

["Jonathan Hurley (JIRA)" <ji...@apache.org>]

Jonathan Hurley created AMBARI-15864:
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             Summary: Re-Upgrade from 2.2 to 2.3+ Fails Due To Circular Symlink
                 Key: AMBARI-15864
                 URL: https://issues.apache.org/jira/browse/AMBARI-15864
             Project: Ambari
          Issue Type: Bug
    Affects Versions: 2.2.0
            Reporter: Jonathan Hurley
            Assignee: Jonathan Hurley
            Priority: Blocker
             Fix For: 2.2.2


STR:
# With Ambari 2.2.2.0-408 build, install 2.2.9.0 cluster (HA cluster)
# Perform EU to 2.4.2.0-178 till finalize step
# Downgrade back to 2.2.9
# Again run EU to 2.4.2.0

The problem is that the downgrade unlinks configurations, getting rid of {{conf.backup}} and makes {{/etc/<component>/conf}} a directory again. However, the only code which bootstraps {{conf.backup}} is executed on installation of the stack. That action does not happen again between U->D->U.

As a way to catch this scenario, {{conf_select.select()}} tries to be smart and checks for {{/etc/<component>/conf}} as a directory and if it finds that it is, it will create {{conf.backup}}. *The bug here is that the new {{/etc/<component</conf}} link points to {{/usr/hdp/current/<component>/conf}} which is a link back to {{/etc/<component>/conf}}. It should be linked to {{/etc/<component>/conf.backup}} instead.*

{code}
EU fails while stopping 3/5 Node Managers with below error:
{code}
Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/common-services/YARN/2.1.0.2.0/package/scripts/nodemanager.py", line 153, in <module>
    Nodemanager().execute()
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 219, in execute
    method(env)
  File "/var/lib/ambari-agent/cache/common-services/YARN/2.1.0.2.0/package/scripts/nodemanager.py", line 45, in stop
    service('nodemanager',action='stop')
  File "/usr/lib/python2.6/site-packages/ambari_commons/os_family_impl.py", line 89, in thunk
    return fn(*args, **kwargs)
  File "/var/lib/ambari-agent/cache/common-services/YARN/2.1.0.2.0/package/scripts/service.py", line 84, in service
    Execute(daemon_cmd, user=usr)
  File "/usr/lib/python2.6/site-packages/resource_management/core/base.py", line 154, in __init__
    self.env.run()
  File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 160, in run
    self.run_action(resource, action)
  File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 124, in run_action
    provider_action()
  File "/usr/lib/python2.6/site-packages/resource_management/core/providers/system.py", line 238, in action_run
    tries=self.resource.tries, try_sleep=self.resource.try_sleep)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 70, in inner
    result = function(command, **kwargs)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 92, in checked_call
    tries=tries, try_sleep=try_sleep)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 140, in _call_wrapper
    result = _call(command, **kwargs_copy)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 291, in _call
    raise Fail(err_msg)
resource_management.core.exceptions.Fail: Execution of 'export HADOOP_LIBEXEC_DIR=/usr/hdp/2.2.9.0-3393/hadoop/libexec && /usr/hdp/current/hadoop-yarn-nodemanager/sbin/yarn-daemon.sh --config /usr/hdp/2.2.9.0-3393/hadoop/conf stop nodemanager' returned 1. Error: Cannot find configuration directory: /usr/hdp/2.2.9.0-3393/hadoop/conf
{code}



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