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https://issues.apache.org/jira/browse/IMPALA-12397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang reassigned IMPALA-12397:
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Assignee: ji.chen
> NullPointerException in SHOW ROLES when there are no roles
> ----------------------------------------------------------
>
> Key: IMPALA-12397
> URL: https://issues.apache.org/jira/browse/IMPALA-12397
> Project: IMPALA
> Issue Type: Bug
> Components: Security
> Reporter: Quanlong Huang
> Assignee: ji.chen
> Priority: Major
> Labels: newbie, ramp-up
>
> When there are no roles in Ranger, SHOW ROLES statement hits
> NullPointerException:
> {noformat}
> Query: show roles
> ERROR: InternalException: Error executing SHOW ROLES. Ranger error message:
> null
> {noformat}
> The cause is 'roles' here is null:
> {code:java}
> Set<RangerRole> roles = plugin_.get().getRoles().getRangerRoles();
> roleNames =
> roles.stream().map(RangerRole::getName).collect(Collectors.toSet());
> {code}
> https://github.com/apache/impala/blob/08501cef2df16991bbd99656c696b978f08aeebe/fe/src/main/java/org/apache/impala/authorization/ranger/RangerImpaladAuthorizationManager.java#L135-L136
> To reproduce this, start Impala cluster with Ranger authorization:
> {code:bash}
> bin/start-impala-cluster.py --impalad_args="--server-name=server1
> --ranger_service_type=hive --ranger_app_id=impala
> --authorization_provider=ranger" --catalogd_args="--server-name=server1
> --ranger_service_type=hive --ranger_app_id=impala
> --authorization_provider=ranger"
> {code}
> At the begining, there are no roles in Ranger. Run "SHOW ROLES" in Impala to
> reproduce the error.
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