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https://reviews.apache.org/r/46345/
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Review request for Ambari, Alejandro Fernandez and Nate Cole.


Bugs: AMBARI-15950
    https://issues.apache.org/jira/browse/AMBARI-15950


Repository: ambari


Description
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STR:

- Install cluster on HDP 2.3
- Add a host with DataNode after cluster has been installed

For hosts part of the cluster creation:
{code}
[root@os-r6-orydgs-upg-sanity-211-5 /]# ls -la /etc/hadoop/
total 24
drwxr-xr-x.   4 root root  4096 Apr 18 04:49 .
drwxr-xr-x. 114 root root 12288 Apr 18 10:53 ..
drwxr-xr-x.   3 root root  4096 Apr 18 04:49 2.3.4.0-3485
lrwxrwxrwx.   1 root root    35 Apr 18 04:49 conf -> 
/usr/hdp/current/hadoop-client/conf
drwxr-xr-x.   2 root root  4096 Apr 18 04:49 conf.install
{code}

For hosts was added after cluster creation:
{code}
[root@os-r6-orydgs-upg-sanity-211-2 ~]# ls -la /etc/hadoop
total 16
drwxr-xr-x.  4 root root 4096 Apr 18 09:34 .
drwxr-xr-x. 80 root root 4096 Apr 18 09:35 ..
drwxr-xr-x.  3 root root 4096 Apr 18 09:34 2.3.4.0-3485
lrwxrwxrwx.  1 root root   23 Apr 18 09:34 conf -> /etc/hadoop/conf.backup
drwxr-xr-x.  2 root root 4096 Apr 18 10:36 conf.backup
{code}

This causes the {{/etc/<component>/conf}} folder to point indefinitely to the 
{{/etc/<component>/conf.backup}}.


Diffs
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ambari-common/src/main/python/resource_management/libraries/functions/conf_select.py
 7ce4a6f 

Diff: https://reviews.apache.org/r/46345/diff/


Testing
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mvn clean test


Thanks,

Jonathan Hurley

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