[jira] [Created] (AMBARI-21451) Livy and Spark client restart fails during downgrade due to missing configuration parameter 'original_stack'

["Vivek Sharma (JIRA)" <ji...@apache.org>]

Vivek Sharma created AMBARI-21451:
-------------------------------------

             Summary: Livy and Spark client restart fails during downgrade due to missing configuration parameter 'original_stack'
                 Key: AMBARI-21451
                 URL: https://issues.apache.org/jira/browse/AMBARI-21451
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
    Affects Versions: 2.5.2
            Reporter: Vivek Sharma
            Priority: Blocker
             Fix For: 2.5.2


*STR*
# Deployed cluster with Ambari version: 2.4.3.0-30 and HDP version: 2.5.5.0-157
# Upgrade Ambari to 2.5.2.0-114 | hash: d2ee45733e0c63d589f535866e6584b42d91126e
# Start EU to 2.6.2.0-79 and reach till Finalize
# Downgrade back to 2.5

*Result*
Observed errors at Livy and Spark client restarts:
{code}
Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/common-services/SPARK/1.2.1/package/scripts/spark_client.py", line 88, in <module>
    SparkClient().execute()
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 329, in execute
    method(env)
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 806, in restart
    self.pre_upgrade_restart(env, upgrade_type=upgrade_type)
  File "/var/lib/ambari-agent/cache/common-services/SPARK/1.2.1/package/scripts/spark_client.py", line 79, in pre_upgrade_restart
    import params
  File "/var/lib/ambari-agent/cache/common-services/SPARK/1.2.1/package/scripts/params.py", line 62, in <module>
    stack_version_unformatted = config['commandParams']['original_stack'].split("-")[1]
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/config_dictionary.py", line 73, in __getattr__
    raise Fail("Configuration parameter '" + self.name + "' was not found in configurations dictionary!")
resource_management.core.exceptions.Fail: Configuration parameter 'original_stack' was not found in configurations dictionary!
{code}



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