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https://reviews.apache.org/r/40782/
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Review request for Ambari, Dmytro Sen, Sumit Mohanty, and Sid Wagle.


Bugs: AMBARI-14107
    https://issues.apache.org/jira/browse/AMBARI-14107


Repository: ambari


Description
-------

PROBLEM

Error occured in stack advisor.
Error details: local variable 'heapPropertyToIncreaseItem' referenced before 
assignment
24 Nov 2015 23:20:41,541  INFO [qtp-client-29] StackAdvisorRunner:71 -     
advisor script stderr: Traceback (most recent call last):
  File "/var/lib/ambari-server/resources/scripts/stack_advisor.py", line 158, 
in <module>
    main(sys.argv)
  File "/var/lib/ambari-server/resources/scripts/stack_advisor.py", line 115, 
in main
    result = stackAdvisor.validateConfigurations(services, hosts)
  File "/var/lib/ambari-server/resources/scripts/../stacks/stack_advisor.py", 
line 463, in validateConfigurations
    validationItems = self.getConfigurationsValidationItems(services, hosts)
  File 
"/var/lib/ambari-server/resources/scripts/./../stacks/HDP/2.0.6/services/stack_advisor.py",
 line 749, in getConfigurationsValidationItems
    resultItems = method(siteProperties, siteRecommendations, configurations, 
services, hosts)
  File 
"/var/lib/ambari-server/resources/scripts/./../stacks/HDP/2.0.6/services/stack_advisor.py",
 line 1025, in validateAmsHbaseEnvConfigurations
    if to_number(properties[heapPropertyToIncreaseItem]) < 
recommended_hbase_heapsize:
UnboundLocalError: local variable 'heapPropertyToIncreaseItem' referenced 
before assignment

BUG
Incorrect indentation and bug in stack_advisor code.

FIX
Fixed the issues with stack advisor recommendations for ams-hbase-env and 
cleaned up the code such that

 - Add validationItems whenever they are "discovered".
 - Return the first failed validation item for a property.
 - Combine metrics_collector_heapsize and hbase heapsize vaildation item in the 
unused space on collector > 4GB case so that we can send    
   metrics_collector_heapsize (ams-env) validation also as part of 
ams-hbase-env validation items.


Diffs
-----

  ambari-server/src/main/resources/stacks/HDP/2.0.6/services/stack_advisor.py 
6031fbd 

Diff: https://reviews.apache.org/r/40782/diff/


Testing
-------

Python unit tests pass.

Tested manually on big cluster to trigger execution path.


Thanks,

Aravindan Vijayan

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