If you change this file structure like:
```
{
"user1" : ["role1", "role2"],
"user2" : ["role1", "role3"]
}
```
than in the java code the user would be the key and the role list would be the
value in the `simpleRolesMap` and the `List<...>
RoleDao.getRolesForUser(username)` function implementation would be much
simpler like
```
simpleRolesMap.get(username)
```
[ Full content available at: https://github.com/apache/ambari/pull/2336 ]
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