[jira] [Created] (CASSANDRA-9189) DROP ROLE shouldn't cache information about non-existent roles

["Sam Tunnicliffe (JIRA)" <ji...@apache.org>]

Sam Tunnicliffe created CASSANDRA-9189:
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             Summary: DROP ROLE shouldn't cache information about non-existent roles
                 Key: CASSANDRA-9189
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9189
             Project: Cassandra
          Issue Type: Bug
            Reporter: Sam Tunnicliffe
            Assignee: Sam Tunnicliffe
             Fix For: 3.0


{{DropRoleStatement#checkAccess}} involves a check of the target role's superuser status in order to ensure that only superusers can drop another  with su privileges.

When used in conjunction with {{IF EXISTS}}, this causes a cache entry for a non-existent role to be inserted into the roles cache as {{Roles#hasSuperuserStatus}} goes via the cache. {{RolesCache}} is a map from a single role to the set of roles of which it has transitively been granted (basically a map of {{RoleResource}} -> {{Set<RoleResource>}}). So in this case an empty set is cached for the role. 

This can be problematic when the {{DROP ROLE IF EXISTS}} is followed by a {{CREATE ROLE}} as until the cache entry expires any authorization request for that role will use the cache to fetch the set of roles that need to be included in the permission check. Finding an empty set, all authz checks will result in failure. This pattern is particularly common in automated tests.



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