[jira] [Created] (SENTRY-334) Handle errors more user firendly in db store when objects are not present.

[Sravya Tirukkovalur (JIRA)]

Sravya Tirukkovalur created SENTRY-334:
------------------------------------------

             Summary: Handle errors more user firendly in db store when objects 
are not present.
                 Key: SENTRY-334
                 URL: https://issues.apache.org/jira/browse/SENTRY-334
             Project: Sentry
          Issue Type: Bug
    Affects Versions: 1.3.0
            Reporter: Sravya Tirukkovalur
             Fix For: 1.3.0


For example show role grant group <groupName> throws a stack trace if the group 
has no roles granted:

{noformat}
0: jdbc:hive2://localhost:10000/> show role grant group admin;
Error: Error while processing statement: FAILED: Execution Error, return code 1 
from org.apache.hadoop.hive.ql.exec.SentryGrantRevokeTask. Role: 
TListSentryRolesRequest(protocol_version:1, requestorUserName:hive, 
groupName:admin) couldn't be retrieved.. Server Stacktrace: 
org.apache.sentry.provider.db.SentryNoSuchObjectException: Group admin
        at 
org.apache.sentry.provider.db.service.persistent.SentryStore.getMSentryRolesByGroupName(SentryStore.java:855)
        at 
org.apache.sentry.provider.db.service.persistent.SentryStore.getTSentryRolesByGroupName(SentryStore.java:884)
        at 
org.apache.sentry.provider.db.service.thrift.SentryPolicyStoreProcessor.list_sentry_roles_by_group(SentryPolicyStoreProcessor.java:326)
        at 
org.apache.sentry.provider.db.service.thrift.SentryPolicyService$Processor$list_sentry_roles_by_group.getResult(SentryPolicyService.java:773)
        at 
org.apache.sentry.provider.db.service.thrift.SentryPolicyService$Processor$list_sentry_roles_by_group.getResult(SentryPolicyService.java:758)
        at 
sentry.org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
        at 
sentry.org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
        at 
sentry.org.apache.thrift.TMultiplexedProcessor.process(TMultiplexedProcessor.java:123)
        at 
sentry.org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:244)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745) (state=08S01,code=1)
{noformat}



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