+++ This bug was initially created as a clone of Bug #1337833 +++

Description of problem:

I needed to add additional subscription to my Satellite. Because of some other testing I deleted the manifest and then tried to re-upload the new manifest.

This failed because of https://bugzilla.redhat.com/show_bug.cgi?id=1334996

But now, I have a Satellite, that is in a state, unable to delete the manifest, failing to refresh the manifest and also failing to upload any new manifest

Version-Release number of selected component (if applicable):

 - foreman-1.11.0.28-1.el7sat.noarch
 - katello-3.0.0-4.el7sat.noarch
 - candlepin-0.9.54.6-1.el7.noarch
 - pulp-server-2.8.1.3-1.el7sat.noarch

How reproducible:

Happen once so far

Steps to Reproduce:
1. Delete the Manifest and re-assign the Satellite 6 system to a new account on the Red Hat portal
2. create new mainfest and upload
3. Make sure you hit https://bugzilla.redhat.com/show_bug.cgi?id=1334996
4. Try to delete/refresh/re-upload manifest

Actual results:

All activity is failing with the following error in candlepin.log

2016-05-20 09:56:32,027 [thread=http-bio-8443-exec-1] [req=83218a06-bd98-4c53-bd04-44a27e7384fe, org=Default_Organization] INFO  org.candlepin.resource.OwnerResource - Import attempt completed for owner Default Organization
2016-05-20 09:56:32,028 [thread=http-bio-8443-exec-1] [req=83218a06-bd98-4c53-bd04-44a27e7384fe, org=Default_Organization] ERROR org.candlepin.common.exceptions.mappers.CandlepinExceptionMapper - Runtime Error query did not return a unique result: 2 at org.hibernate.internal.AbstractQueryImpl.uniqueElement:914
org.hibernate.NonUniqueResultException: query did not return a unique result: 2
	at org.hibernate.internal.AbstractQueryImpl.uniqueElement(AbstractQueryImpl.java:914) ~[hibernate-core-4.2.5.Final.jar:4.2.5.Final]
	at org.hibernate.internal.CriteriaImpl.uniqueResult(CriteriaImpl.java:396) ~[hibernate-core-4.2.5.Final.jar:4.2.5.Final]
	at org.candlepin.model.ExporterMetadataCurator.lookupByTypeAndOwner(ExporterMetadataCurator.java:42) ~[ExporterMetadataCurator.class:na]
	at org.candlepin.sync.Importer.validateMetadata(Importer.java:189) ~[Importer.class:na]
	at org.candlepin.sync.Importer.importObjects(Importer.java:396) ~[Importer.class:na]
	at com.google.inject.persist.jpa.JpaLocalTxnInterceptor.invoke(JpaLocalTxnInterceptor.java:66) ~[guice-persist-3.0.jar:na]
	at org.candlepin.sync.Importer.loadExport(Importer.java:291) ~[Importer.class:na]
	at org.candlepin.resource.OwnerResource.importManifest(OwnerResource.java:1105) ~[OwnerResource.class:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_101]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_101]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_101]
	at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_101]
	at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:168) ~[resteasy-jaxrs-2.3.10.Final.jar:na]
	at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:269) ~[resteasy-jaxrs-2.3.10.Final.jar:na]
	at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:227) ~[resteasy-jaxrs-2.3.10.Final.jar:na]
	at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:216) ~[resteasy-jaxrs-2.3.10.Final.jar:na]
	at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:541) [resteasy-jaxrs-2.3.10.Final.jar:na]
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:523) [resteasy-jaxrs-2.3.10.Final.jar:na]
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:125) [resteasy-jaxrs-2.3.10.Final.jar:na]
	at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) [resteasy-jaxrs-2.3.10.Final.jar:na]
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) [resteasy-jaxrs-2.3.10.Final.jar:na]
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) [resteasy-jaxrs-2.3.10.Final.jar:na]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) [tomcat-servlet-3.0-api.jar:na]
	at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263) [guice-servlet-3.0.jar:na]
	at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178) [guice-servlet-3.0.jar:na]
	at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91) [guice-servlet-3.0.jar:na]
	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62) [guice-servlet-3.0.jar:na]
	at org.candlepin.servlet.filter.EventFilter.doFilter(EventFilter.java:63) [EventFilter.class:na]
	at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163) [guice-servlet-3.0.jar:na]
	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58) [guice-servlet-3.0.jar:na]
	at org.candlepin.servlet.filter.ContentTypeHackFilter.doFilter(ContentTypeHackFilter.java:58) [ContentTypeHackFilter.class:na]
	at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163) [guice-servlet-3.0.jar:na]
	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58) [guice-servlet-3.0.jar:na]
	at org.candlepin.common.filter.LoggingFilter.doFilter(LoggingFilter.java:90) [candlepin-common-1.0.23.jar:na]
	at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163) [guice-servlet-3.0.jar:na]
	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58) [guice-servlet-3.0.jar:na]
	at org.candlepin.servlet.filter.CandlepinPersistFilter.doFilter(CandlepinPersistFilter.java:48) [CandlepinPersistFilter.class:na]
	at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163) [guice-servlet-3.0.jar:na]
	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58) [guice-servlet-3.0.jar:na]
	at org.candlepin.servlet.filter.CandlepinScopeFilter.doFilter(CandlepinScopeFilter.java:68) [CandlepinScopeFilter.class:na]
	at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163) [guice-servlet-3.0.jar:na]
	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58) [guice-servlet-3.0.jar:na]
	at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118) [guice-servlet-3.0.jar:na]
	at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113) [guice-servlet-3.0.jar:na]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.54]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.54]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) [catalina.jar:7.0.54]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) [catalina.jar:7.0.54]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) [catalina.jar:7.0.54]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) [catalina.jar:7.0.54]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [catalina.jar:7.0.54]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) [catalina.jar:7.0.54]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) [catalina.jar:7.0.54]
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) [tomcat-coyote.jar:7.0.54]
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) [tomcat-coyote.jar:7.0.54]
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314) [tomcat-coyote.jar:7.0.54]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_101]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_101]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-coyote.jar:7.0.54]
	at java.lang.Thread.run(Thread.java:745) [na:1.7.0_101]

Expected results:

Ability to properly remove the manifest or do proper update/refresh of the manifest uploaded

Additional info:

I tried cleaning backend data, reindex, etc. But nothing worked so far.

Information in production.log of foreman

2016-05-20 09:56:31 [katello/glue] [I] Task import manifest /usr/share/foreman/tmp/import_10c23b4a42c3d04eb4e9.zip for owner: Default Organization (1/3) > Katello::Provider.find(2).owner_import("/usr/share/foreman/)
2016-05-20 09:56:31 [app] [I]   Rendered /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/views/katello/api/v2/common/async.json.rabl within katello/api/v2/layouts/resource (62.4ms)
2016-05-20 09:56:31 [app] [I] Completed 202 Accepted in 330ms (Views: 62.7ms | ActiveRecord: 28.2ms)
2016-05-20 09:56:31 [app] [I] Started POST "/foreman_tasks/api/tasks/bulk_search" for 10.36.112.41 at 2016-05-20 09:56:31 +0200
2016-05-20 09:56:31 [app] [I] Processing by ForemanTasks::Api::TasksController#bulk_search as JSON
2016-05-20 09:56:31 [app] [I]   Parameters: {"searches"=>[{"type"=>"task", "task_id"=>"96c66e09-5a50-4076-93ec-1155a30cf26a", "search_id"=>"3"}], "task"=>{}}
2016-05-20 09:56:31 [app] [I] Completed 200 OK in 61ms (Views: 2.0ms | ActiveRecord: 2.6ms)
2016-05-20 09:56:32 [app] [E] Error during manifest import: {"displayMessage"=>"Runtime Error query did not return a unique result: 2 at org.hibernate.internal.AbstractQueryImpl.uniqueElement:914", "requestUuid"=>"83218a06-bd98-4c53-bd04-44a27e7384fe"}
2016-05-20 09:56:32 [foreman-tasks/action] [E] Runtime Error query did not return a unique result: 2 at org.hibernate.internal.AbstractQueryImpl.uniqueElement:914 (Katello::Errors::CandlepinError)
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/propagate_candlepin_errors.rb:21:in `rescue in propagate_candlepin_errors'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/propagate_candlepin_errors.rb:19:in `propagate_candlepin_errors'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/propagate_candlepin_errors.rb:9:in `run'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware/stack.rb:22:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware/stack.rb:26:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware.rb:17:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/remote_action.rb:16:in `block in run'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/remote_action.rb:40:in `block in as_remote_user'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/models/katello/concerns/user_extensions.rb:20:in `cp_config'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/remote_action.rb:27:in `as_cp_user'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/remote_action.rb:39:in `as_remote_user'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/remote_action.rb:16:in `run'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware/stack.rb:22:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware/stack.rb:26:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware.rb:17:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action/progress.rb:30:in `with_progress_calculation'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action/progress.rb:16:in `run'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware/stack.rb:22:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware/stack.rb:26:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware.rb:17:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/keep_locale.rb:11:in `block in run'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/keep_locale.rb:22:in `with_locale'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.31/app/lib/actions/middleware/keep_locale.rb:11:in `run'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware/stack.rb:22:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware/stack.rb:26:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware.rb:17:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware.rb:30:in `run'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware/stack.rb:22:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/middleware/world.rb:30:in `execute'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action.rb:505:in `block (2 levels) in execute_run'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action.rb:504:in `catch'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action.rb:504:in `block in execute_run'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action.rb:419:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action.rb:419:in `block in with_error_handling'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action.rb:419:in `catch'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action.rb:419:in `with_error_handling'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action.rb:499:in `execute_run'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/action.rb:260:in `execute'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/execution_plan/steps/abstract_flow_step.rb:9:in `block (2 levels) in execute'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/execution_plan/steps/abstract.rb:155:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/execution_plan/steps/abstract.rb:155:in `with_meta_calculation'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/execution_plan/steps/abstract_flow_step.rb:8:in `block in execute'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/execution_plan/steps/abstract_flow_step.rb:22:in `open_action'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/execution_plan/steps/abstract_flow_step.rb:7:in `execute'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/executors/parallel/worker.rb:15:in `block in on_message'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/algebrick-0.7.3/lib/algebrick/matchers/abstract.rb:74:in `block in assigns'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/algebrick-0.7.3/lib/algebrick/matchers/abstract.rb:73:in `tap'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/algebrick-0.7.3/lib/algebrick/matchers/abstract.rb:73:in `assigns'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/algebrick-0.7.3/lib/algebrick/matching.rb:56:in `match_value'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/algebrick-0.7.3/lib/algebrick/matching.rb:36:in `block in match?'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/algebrick-0.7.3/lib/algebrick/matching.rb:35:in `each'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/algebrick-0.7.3/lib/algebrick/matching.rb:35:in `match?'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/algebrick-0.7.3/lib/algebrick/matching.rb:23:in `match'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/executors/parallel/worker.rb:12:in `on_message'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/context.rb:46:in `on_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/executes_context.rb:7:in `on_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/abstract.rb:25:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-0.8.11/lib/dynflow/actor.rb:26:in `on_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/abstract.rb:25:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/awaits.rb:15:in `on_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/abstract.rb:25:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/sets_results.rb:14:in `on_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/abstract.rb:25:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/buffer.rb:38:in `process_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/buffer.rb:31:in `process_envelopes?'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/buffer.rb:20:in `on_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/abstract.rb:25:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/termination.rb:55:in `on_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/abstract.rb:25:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/removes_child.rb:10:in `on_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/abstract.rb:25:in `pass'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/behaviour/sets_results.rb:14:in `on_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/core.rb:161:in `process_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/core.rb:95:in `block in on_envelope'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/core.rb:118:in `block (2 levels) in schedule_execution'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/synchronization/mri_lockable_object.rb:38:in `block in synchronize'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/synchronization/mri_lockable_object.rb:38:in `synchronize'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/synchronization/mri_lockable_object.rb:38:in `synchronize'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-edge-0.2.0/lib/concurrent/actor/core.rb:115:in `block in schedule_execution'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/serialized_execution.rb:18:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/serialized_execution.rb:18:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/serialized_execution.rb:96:in `work'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/serialized_execution.rb:77:in `block in call_job'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/ruby_thread_pool_executor.rb:333:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/ruby_thread_pool_executor.rb:333:in `run_task'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/ruby_thread_pool_executor.rb:322:in `block (3 levels) in create_worker'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/ruby_thread_pool_executor.rb:305:in `loop'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/ruby_thread_pool_executor.rb:305:in `block (2 levels) in create_worker'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/ruby_thread_pool_executor.rb:304:in `catch'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/concurrent-ruby-1.0.0/lib/concurrent/executor/ruby_thread_pool_executor.rb:304:in `block in create_worker'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/logging-1.8.2/lib/logging/diagnostic_context.rb:323:in `call'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/logging-1.8.2/lib/logging/diagnostic_context.rb:323:in `block in create_with_logging_context'

--- Additional comment from Barnaby Court on 2016-05-23 13:21:04 EDT ---

There is definitely an issue here, if two imports are started  concurrently for an owner they can both succeed and two records for the same owner will be created in cp_export_metadata. When org.candlepin.model.ExporterMetadataCurator.lookupByTypeAndOwner() runs there are two records and it errors out. Either cp_export_metadata needs to be unique per owner_id & type, combination or there needs to be some other means to prevent us from getting into this state.