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https://issues.apache.org/jira/browse/AMBARI-9255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Taeyun Kim updated AMBARI-9255:
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    Description: 
After YARN Configs is changed and saved, there is a case that the saved 
configuration itself bacomes invalid state(for example, some config value is 
missing).

In my case, the missing one was 'yarn.resourcemanager.fs.state-store.uri'. But 
that variable is hidden in the folded 'Advanced yarn-site' group, so there is 
no clue that some variable has incorrect or missing value.

So when I change an another config value, Discard button is enabled, but Save 
button is not enabled. But I see no clue why.

Here, there are 2 problems:

1. Incorrect state is saved by UI. It should not happen.
2. Soometimes it's hard to see what is wrong that's preventing Save.

> Show why Configs Save button is disabled
> ----------------------------------------
>
>                 Key: AMBARI-9255
>                 URL: https://issues.apache.org/jira/browse/AMBARI-9255
>             Project: Ambari
>          Issue Type: Improvement
>    Affects Versions: 1.7.0
>            Reporter: Taeyun Kim
>            Priority: Minor
>
> After YARN Configs is changed and saved, there is a case that the saved 
> configuration itself bacomes invalid state(for example, some config value is 
> missing).
> In my case, the missing one was 'yarn.resourcemanager.fs.state-store.uri'. 
> But that variable is hidden in the folded 'Advanced yarn-site' group, so 
> there is no clue that some variable has incorrect or missing value.
> So when I change an another config value, Discard button is enabled, but Save 
> button is not enabled. But I see no clue why.
> Here, there are 2 problems:
> 1. Incorrect state is saved by UI. It should not happen.
> 2. Soometimes it's hard to see what is wrong that's preventing Save.



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