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ambari-web/app/utils/config.js
<https://reviews.apache.org/r/27547/#comment101136>

    We might not want to introduce this function over here.
    
    So on enabling HA when we go to HDFS page, this config will be changed by 
the new code:
    1) An undo sign will be present without user having made any changes 
expicitly and navigating out of this page will warn user to save the change 
before navigating.
    2) User will not be able to change this config value via UI. If user 
changes this config then it will be saved successfully but after that again 
0.99f will appear as the value of the config forcing it to save the config with 
only this value. 
    
    Instead I suggest to update this config with 0.99f only once on NameNode HA 
wizard (Review page that displays all properties that will change as part of 
this wizard)


- Jaimin Jetly


On Nov. 4, 2014, 9:05 p.m., Xi Wang wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/27547/
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> 
> (Updated Nov. 4, 2014, 9:05 p.m.)
> 
> 
> Review request for Ambari, Jaimin Jetly and Yusaku Sako.
> 
> 
> Bugs: Ambari-8129
>     https://issues.apache.org/jira/browse/Ambari-8129
> 
> 
> Repository: ambari
> 
> 
> Description
> -------
> 
> hdfs-site.xml
> Change value of "dfs.namenode.safemode.threshold-pct" to "0.99f" if NN HA
> 
> 
> Diffs
> -----
> 
>   ambari-web/app/utils/config.js 2f157e8 
> 
> Diff: https://reviews.apache.org/r/27547/diff/
> 
> 
> Testing
> -------
> 
> Tested patch before/after NN HA enabled. Unit tests passed.
> 
> 
> Thanks,
> 
> Xi Wang
> 
>

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