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Review request for Ambari, Alexandr Antonenko and Di Li.


Bugs: AMBARI-18327
    https://issues.apache.org/jira/browse/AMBARI-18327


Repository: ambari


Description
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While installing a cluster if the Ambari user happened to click the "Next" 
button of Step-4 (Choose Services step) more than once, then it could lead to 
skipping directly to step-6 or 7 or 8 depending on the number of times the 
click got registered. This behavior is reproducible only when the host is slow, 
which would allow enough time to click the Next button multiple times.

This issue is related to AMBARI-14574, and is a revised fix for the Step-4.


Diffs
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  ambari-web/app/controllers/wizard/step4_controller.js 04e6784 

Diff: https://reviews.apache.org/r/51677/diff/


Testing
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ambari-web unit tests affter applying the patch:

  30182 tests complete (46 seconds)
  151 tests pending


Also, did manual testing by adding a timeout in the submit() of 
step4_controller.js to allow multiple clicks to be registered on the Next 
button.


Thanks,

Keta Patel

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