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https://reviews.apache.org/r/45548/
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Review request for Ambari, Alejandro Fernandez, Jonathan Hurley, Jayush Luniya, 
and Sumit Mohanty.


Bugs: AMBARI-15645
    https://issues.apache.org/jira/browse/AMBARI-15645


Repository: ambari


Description
-------

After upgrading HDP in Ambari version 2.1.2.1 a task a performed to _role 
edits_ while restarting JournalNodes. If Kerberos is enabled, the JN Kerberos 
identity is established before making this call when really the HDFS identity 
should be established - since this is an administrative HDFS call that requires 
the HDFS administrator user to perform.

Because of this, the following error is generated and seen in the :
{noformat}
Fail: Execution of 'hdfs dfsadmin -rollEdits' returned 255. rollEdits: Access 
denied for user jn. Superuser privilege is required
{noformat}

The offending code is
# common-services/HDFS/2.1.0.2.0/package/scripts/journalnode_upgrade.py
```
if params.security_enabled:
    Execute(params.jn_kinit_cmd, user=params.hdfs_user)

  time.sleep(5)
  hdfs_roll_edits()
  time.sleep(5)
```

It should probably be something like:

# common-services/HDFS/2.1.0.2.0/package/scripts/journalnode_upgrade.py
```
if params.security_enabled:
    Execute(params.hdfs_kinit_cmd, user=params.hdfs_user)

  time.sleep(5)
  hdfs_roll_edits()
  time.sleep(5)
```

# *Note the change from jn to hdfs in the kinit command line.*

This issue has also been posted in 
https://issues.apache.org/jira/browse/AMBARI-10519.


Diffs
-----

  
ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/journalnode_upgrade.py
 bd9f014 
  
ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/params_linux.py
 d6dec26 

Diff: https://reviews.apache.org/r/45548/diff/


Testing
-------

Manually tested, but issues seems to be intermittent in *control* cluster.


Thanks,

Robert Levas

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