Here's what the entire stacktrace shows:

2013-09-30 00:31:09,528 urllib3.connectionpool:INFO: Starting new HTTPS connection (2): cdn.redhat.com
2013-09-30 00:31:09,898 urllib3.connectionpool:INFO: Resetting dropped connection: cdn.redhat.com
2013-09-30 00:31:10,528 urllib3.connectionpool:WARNING: Retrying (0 attempts remain) after connection broken by 'BadStatusLine('',)': /content/dist/rhel/power/6/6Server/ppc64/os/Packages/python-decorator-3.0.1-3.1.el6.noarch.rpm
2013-09-30 00:31:10,532 nectar.downloaders.threaded:ERROR: HTTPSConnectionPool(host='cdn.redhat.com', port=443): Max retries exceeded with url: /content/dist/rhel/power/6/6Server/ppc64/os/Packages/python-decorator-3.0.1-3.1.el6.noarch.rpm
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/nectar/downloaders/threaded.py", line 160, in _fetch
    response = session.get(request.url, headers=headers)
  File "/usr/lib/python2.6/site-packages/requests/sessions.py", line 310, in get
    return self.request('GET', url, **kwargs)
  File "/usr/lib/python2.6/site-packages/requests/sessions.py", line 279, in request
    resp = self.send(prep, stream=stream, timeout=timeout, verify=verify, cert=cert, proxies=proxies)
  File "/usr/lib/python2.6/site-packages/requests/sessions.py", line 374, in send
    r = adapter.send(request, **kwargs)
  File "/usr/lib/python2.6/site-packages/requests/adapters.py", line 209, in send
    raise ConnectionError(e)
ConnectionError: HTTPSConnectionPool(host='cdn.redhat.com', port=443): Max retries exceeded with url: /content/dist/rhel/power/6/6Server/ppc64/os/Packages/python-decorator-3.0.1-3.1.el6.noarch.rpm
2013-09-30 00:31:10,539 urllib3.connectionpool:INFO: Starting new HTTPS connection (2): cdn.redhat.com
2013-09-30 00:31:11,315 urllib3.connectionpool:INFO: Resetting dropped connection: cdn.redhat.com
2013-09-30 00:31:13,353 urllib3.connectionpool:INFO: Resetting dropped connection: cdn.redhat.com
2013-09-30 00:37:37,695 urllib3.connectionpool:INFO: Starting new HTTPS connection (1): cdn.redhat.com
2013-09-30 00:37:38,049 nectar.downloaders.threaded:ERROR: Download of https://cdn.redhat.com/content/dist/rhel/power/6/6Server/ppc64/os/.treeinfo failed with code 404: Not Found

Tracking upstream - https://github.com/Katello/katello/pull/3069

*** Bug 1010096 has been marked as a duplicate of this bug. ***

The fix is available as of ad5d5b72eb788c0d52da234c571bd1b4ca44d3a2

This fix updates the algorithm for parsing pulp sync status objects and updates the tooltip error output. Further, the tooltip is now a clickable link to the notifications page. 

This fix also re-enables the after-sync notification handling from Pulp. The user will once again be presented with a notification upon completion of a sync. And, if there are errors, a detailed view of those errors will be present on the notifications page.

Verified with snap6 compose2 (MDP2)

katello-qpid-client-key-pair-1.0-1.noarch
katello-glue-candlepin-1.4.6-40.el6sat.noarch
katello-1.4.6-40.el6sat.noarch
katello-foreman-all-1.4.6-40.el6sat.noarch
katello-candlepin-cert-key-pair-1.0-1.noarch
katello-configure-1.4.7-6.el6sat.noarch
signo-katello-0.0.23-2.el6sat.noarch
katello-glue-elasticsearch-1.4.6-40.el6sat.noarch
ruby193-rubygem-katello-foreman-engine-0.0.12-3.el6sat.noarch
katello-cli-1.4.3-24.el6sat.noarch
katello-certs-tools-1.4.4-1.el6sat.noarch
katello-qpid-broker-key-pair-1.0-1.noarch
ruby193-rubygem-foreman-katello-engine-0.0.17-6.el6sat.noarch
katello-common-1.4.6-40.el6sat.noarch
pulp-katello-plugins-0.2-1.el6sat.noarch
katello-configure-foreman-1.4.7-6.el6sat.noarch
katello-selinux-1.4.4-4.el6sat.noarch
katello-cli-common-1.4.3-24.el6sat.noarch
katello-glue-pulp-1.4.6-40.el6sat.noarch
katello-all-1.4.6-40.el6sat.noarch
ruby193-rubygem-katello_api-0.0.3-4.el6sat.noarch


Sync failed and now tool tip just says 'Not Found' and when I moved to notices page by clicking on it, there were no error listed. 

no stack trace in production.log, it says:
[ERROR 2013-10-21 11:48:24 app  #5873] Task PulpSyncStatus (22) is in error state
[ERROR 2013-10-21 11:48:24 app  #5873] *** Sync error:

Created attachment 814554 [details]
no logs under notifications

Created attachment 814556 [details]
tool_tip says 'Not Found'

Pulp.log says the exact error:

--
pulp.log says:

2013-10-21 11:48:21,470 pulp_rpm.plugins.importers.yum.sync:ERROR: sync failed
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/pulp_rpm/plugins/importers/yum/sync.py", line 109, in run
    metadata_files = self.get_metadata()
  File "/usr/lib/python2.6/site-packages/pulp_rpm/plugins/importers/yum/sync.py", line 194, in get_metadata
    raise FailedException(str(e))
FailedException: Not Found
2013-10-21 11:48:21,472 pulp.server.event.http:INFO: {'call_report': {'task_group_id': '656d1c8d-bd27-498a-96ac-9003f6a4499a', 'exception': None, 'traceback': None, 'task_id': 'a2665234-6067-46b4-b8a1-447e31dc2767', 'call_request_tags': [u'pulp:repository:ACME_Corporation-product1-zoo', 'pulp:action:sync'], 'reasons': [], 'start_time': '2013-10-21T06:18:20Z', 'tags': [u'pulp:repository:ACME_Corporation-product1-zoo', 'pulp:action:sync'], 'state': 'running', 'finish_time': None, 'dependency_failures': {}, 'schedule_id': None, 'progress': {u'yum_importer': {'content': {'size_total': 0, 'items_left': 0, 'items_total': 0, 'state': 'NOT_STARTED', 'size_left': 0, 'details': {'rpm_total': 0, 'rpm_done': 0, 'drpm_total': 0, 'drpm_done': 0}, 'error_details': []}, 'comps': {'state': 'NOT_STARTED'}, 'distribution': {'items_total': 0, 'state': 'NOT_STARTED', 'error_details': [], 'items_left': 0}, 'errata': {'state': 'NOT_STARTED'}, 'metadata': {'state': 'FAILED', 'error': 'Not Found'}}}, 'call_request_group_id': '656d1c8d-bd27-498a-96ac-9003f6a4499a', 'call_request_id': 'a2665234-6067-46b4-b8a1-447e31dc2767', 'principal_login': u'admin', 'response': 'accepted', 'result': None}, 'event_type': 'repo.sync.finish', 'payload': {'importer_id': u'yum_importer', 'exception': None, 'repo_id': u'ACME_Corporation-product1-zoo', 'traceback': None, 'started': '2013-10-21T11:48:20+05:30', '_ns': u'repo_sync_results', 'completed': '2013-10-21T11:48:21+05:30', 'importer_type_id': u'yum_importer', 'error_message': None, 'summary': {'content': {'state': 'NOT_STARTED'}, 'comps': {'state': 'NOT_STARTED'}, 'distribution': {'state': 'NOT_STARTED'}, 'errata': {'state': 'NOT_STARTED'}, 'metadata': {'state': 'FAILED'}}, 'added_count': 0, 'result': 'failed', 'updated_count': 0, 'details': {'content': {'size_total': 0, 'items_left': 0, 'items_total': 0, 'state': 'NOT_STARTED', 'size_left': 0, 'details': {'rpm_total': 0, 'rpm_done': 0, 'drpm_total': 0, 'drpm_done': 0}, 'error_details': []}, 'comps': {'state': 'NOT_STARTED'}, 'distribution': {'items_total': 0, 'state': 'NOT_STARTED', 'error_details': [], 'items_left': 0}, 'errata': {'state': 'NOT_STARTED'}, 'metadata': {'state': 'FAILED', 'error': 'Not Found'}}, 'id': '5264c72dacdb986ee80004c5', 'removed_count': 0}}
2013-10-21 11:48:21,474 pulp.server.dispatch.task:ERROR: Importer indicated a failed response
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/pulp/server/dispatch/task.py", line 138, in _run
    result = call(*args, **kwargs)
  File "/usr/lib/python2.6/site-packages/pulp/server/managers/repo/sync.py", line 116, in sync
    raise PulpExecutionException(_('Importer indicated a failed response'))
PulpExecutionException: Importer indicated a failed response
2013-10-21 11:48:21,478 pulp.server.dispatch.task:INFO: FAILURE: Task a2665234-6067-46b4-b8a1-447e31dc2767: CallRequest: RepoSyncManager.sync(u'ACME_Corporation-product1-zoo', sync_config_override={'num_threads': 4})
2013-10-21 11:48:24,965 pulp.server.dispatch.task:INFO: SUCCESS: Task 7dc8ceaf-8e32-426e-9faf-cf7eb359d246: CallRequest: ApplicabilityRegenerationManager.regenerate_applicability_for_repos({'sort': None, 'skip': None, 'limit': None, 'filters': {'id': {'$in': ['ACME_Corporation-product1-zoo']}}, 'fields': ['id'], '_id': ObjectId('5264c730acdb986ee80004cc'), 'id': '5264c730acdb986ee80004cc'})

Hummn. so from comment11, I got to know that the repo url was incorrect. But still I think user should get the error on UI/notifications which is logged in pulp.log ?

We do not have access to what the pulp.log file contains, only that which Pulp returns to us in the task data. In this case, all we know is:

'metadata': {'state': 'FAILED', 'error': 'Not Found'}}}

And the best we can do right now, is parse that out from the output above and present it to the user. In my opinion, this is doing the best we can right now, and further improvements need to be made on the Pulp side with regards to error reporting in the future.

*** Bug 1025005 has been marked as a duplicate of this bug. ***

Closing old bugs which are not relevant based on new UI and CLI