Jonathan Maron commented on YARN-4430:

Given the nature of the underlying issue, the logging of the error rather than 
raising the exception for read-only access seems appropriate.

> registry security validation can fail when downgrading to insecure would work
> -----------------------------------------------------------------------------
>                 Key: YARN-4430
>                 URL: https://issues.apache.org/jira/browse/YARN-4430
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: yarn
>    Affects Versions: 2.7.1
>         Environment: Kerberos, java  7 & 8
>            Reporter: Steve Loughran
> The Registry ZK client code does a pre-emptive validation of registry 
> security settings, in the interest of being helpful when things fail.
> But: sometimes it fails fast (see stack trace in SLIDER-993) when it could 
> just warn and continue -because if the registry is only being read, skipping 
> SASL auth works

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