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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/46155/
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Review request for Ambari, Alejandro Fernandez and Nate Cole.


Bugs: AMBARI-15864
    https://issues.apache.org/jira/browse/AMBARI-15864


Repository: ambari


Description
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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.**


Diffs
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ambari-common/src/main/python/resource_management/libraries/functions/conf_select.py
 b5de69d 
  ambari-server/src/test/python/stacks/2.0.6/HBASE/test_phoenix_queryserver.py 
9f52b57 
  ambari-server/src/test/python/stacks/2.0.6/YARN/test_historyserver.py caf1430 
  ambari-server/src/test/python/stacks/2.0.6/ZOOKEEPER/test_zookeeper_server.py 
2bd9944 

Diff: https://reviews.apache.org/r/46155/diff/


Testing
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OK
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Total run:959
Total errors:0
Total failures:0
OK


Thanks,

Jonathan Hurley

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