Comment 0 for bug 1497365

Sahara cluster (236 hadoop nodes) couldn't be created. On Preparing step occurred the following error:
2015-09-18 16:09:21.046 905 ERROR sahara.service.ops [-] Error during operating on cluster sahara-cluster-nnOwBBKKKzwFGH9lS4sj (reason: An error occurred in thread 'configure-instance-sahara-cluster-nnowbbkkkzwfgh9ls4sj-worker-ng-023': QueuePool limit of size 5 overflow 10 reached, connection timed out, timeout 30
Error ID: a7609278-7d53-4680-81c6-b3bf4c079a44)
http://paste.openstack.org/show/468150/

Cluster configuration:
Baremetal, Ubuntu,IBP,HA, Neutron-vxlan,Ceph-all,Nova-debug,Nova-quotas,Sahara,7.0-296
Controllers:3 Computes+Ceph:47

api: '1.0'
astute_sha: 6c5b73f93e24cc781c809db9159927655ced5012
auth_required: true
build_id: '296'
build_number: '296'
feature_groups:
- mirantis
fuel-agent_sha: 082a47bf014002e515001be05f99040437281a2d
fuel-library_sha: f2eef7717b15c6c0a3e76ef98ad4c7c4532d56f9
fuel-nailgun-agent_sha: d7027952870a35db8dc52f185bb1158cdd3d1ebd
fuel-ostf_sha: 1f08e6e71021179b9881a824d9c999957fcc7045
fuelmain_sha: 6b83d6a6a75bf7bca3177fcf63b2eebbf1ad0a85
nailgun_sha: 16a39d40120dd4257698795f12de4ae8200b1778
openstack_version: 2015.1.0-7.0
production: docker
python-fuelclient_sha: 2864459e27b0510a0f7aedac6cdf27901ef5c481
release: '7.0'

Diagnostic Snapshot: will be soon.