Sometimes wrong user is used to delete the namespace in explore.

2017-06-14 22:58:54,386 WARN co.cask.cdap.internal.app.namespace.DefaultNamespaceAdmin: Error while deleting namespace namespace:test
co.cask.cdap.explore.service.ExploreException: Cannot remove a namespace. Reason: Response code: 500, message: 'Internal Server Error', body: 'Failed to get namespace meta for the
 namespace namespace:test'
        at co.cask.cdap.explore.client.ExploreHttpClient.deleteNamespace(ExploreHttpClient.java:482) ~[na:na]
        at co.cask.cdap.explore.client.AbstractExploreClient.deleteNamespace(AbstractExploreClient.java:66) ~[na:na]
        at co.cask.cdap.explore.client.AbstractExploreClient$20.getHandle(AbstractExploreClient.java:330) ~[na:na]
        at co.cask.cdap.explore.client.AbstractExploreClient$21.call(AbstractExploreClient.java:342) ~[na:na]
        at co.cask.cdap.explore.client.AbstractExploreClient$21.call(AbstractExploreClient.java:339) ~[na:na]
        at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_75]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) ~[na:1.7.0_75]
        at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_75]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) ~[na:1.7.0_75]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) ~[na:1.7.0_75]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[na:1.7.0_75]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) ~[na:1.7.0_75]
        at java.lang.Thread.run(Thread.java:745) ~[na:1.7.0_75]
2017-06-14 22:58:54,380 WARN org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:cdap/authorization24354-1000.dev.continuuity.net@CONTINUUITY.NET (auth:SIMPLE) cause:co.cask.cdap.explore.service.ExploreException: Failed to get namespace meta for the namespace namespace:test
2017-06-14 22:58:54,381 ERROR co.cask.cdap.common.HttpExceptionHandler: Unexpected error: request=DELETE /v3/data/explore/namespaces/test user=eve:
co.cask.cdap.explore.service.ExploreException: Failed to get namespace meta for the namespace namespace:test
        at co.cask.cdap.explore.service.hive.BaseHiveExploreService.deleteNamespace(BaseHiveExploreService.java:813)
        at co.cask.cdap.explore.executor.ExploreMetadataHttpHandler$6$1.call(ExploreMetadataHttpHandler.java:167)
        at co.cask.cdap.explore.executor.ExploreMetadataHttpHandler$6$1.call(ExploreMetadataHttpHandler.java:164)
        at co.cask.cdap.security.impersonation.ImpersonationUtils$1.run(ImpersonationUtils.java:46)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:415)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1920)
        at co.cask.cdap.security.impersonation.ImpersonationUtils.doAs(ImpersonationUtils.java:43)
        at co.cask.cdap.security.impersonation.DefaultImpersonator.doAs(DefaultImpersonator.java:70)
        at co.cask.cdap.security.impersonation.DefaultImpersonator.doAs(DefaultImpersonator.java:59)
        at co.cask.cdap.explore.executor.ExploreMetadataHttpHandler$6.execute(ExploreMetadataHttpHandler.java:164)
        at co.cask.cdap.explore.executor.ExploreMetadataHttpHandler$6.execute(ExploreMetadataHttpHandler.java:159)
        at co.cask.cdap.explore.executor.AbstractExploreMetadataHttpHandler$1.execute(AbstractExploreMetadataHttpHandler.java:53)
        at co.cask.cdap.explore.executor.AbstractExploreMetadataHttpHandler$1.execute(AbstractExploreMetadataHttpHandler.java:49)
        at co.cask.cdap.explore.executor.AbstractExploreMetadataHttpHandler.genericEndpointExecution(AbstractExploreMetadataHttpHandler.java:65)
        at co.cask.cdap.explore.executor.AbstractExploreMetadataHttpHandler.handleResponseEndpointExecution(AbstractExploreMetadataHttpHandler.java:49)
        at co.cask.cdap.explore.executor.ExploreMetadataHttpHandler.delete(ExploreMetadataHttpHandler.java:159)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)