Wei-Chiu Chuang updated HADOOP-13638:
    Attachment: HADOOP-13638.001.patch

v01. a one-liner fixer to set UGI configuration correctly when KMS starts.

I don't think it's easy to unit test it, but I've manually verified this fix 
works on a CDH 5.7.0 cluster.

> KMS should set UGI's Configuration object properly
> --------------------------------------------------
>                 Key: HADOOP-13638
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13638
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: kms
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>         Attachments: HADOOP-13638.001.patch
> We found that the Configuration object in UGI in KMS server is not 
> initialized properly, therefore it does not load core-site.xml from 
> {{KMSConfiguration.KMS_CONFIG_DIR}}.
> This becomes a problem when the Hadoop cluster uses LdapGroupsMapping for 
> group resolution, because the UGI in KMS falls back to the default 
> JniBasedUnixGroupsMappingWithFallback (defined in core-default.xml) and is 
> thus not consistent with the Hadoop cluster.

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