contrail-analytics-api fails to start on mainline centos71 build2704

[Sudheendra Rao]

contrail-analytics-api fails to start on mainline centos71 build2704 on multi-node setup.

Topology :
Config Nodes : [u'nodec21', u'nodec20']
Control Nodes : [u'nodec21', u'nodec20']
Compute Nodes : [u'nodec61', u'nodec60', u'nodec18']
Openstack Node : nodec19
WebUI Node : nodec20
Analytics Nodes : [u'nodec21', u'nodec20']

[root@nodec21 ~]# contrail-status
== Contrail Control ==
supervisor-control: active
contrail-control initializing (No BGP configuration for self)
contrail-control-nodemgr active
contrail-dns active
contrail-named active

== Contrail Analytics ==
supervisor-analytics: active
contrail-alarm-gen active
contrail-analytics-api failed <<<<<<<<<
contrail-analytics-nodemgr active
contrail-collector active
contrail-query-engine active
contrail-snmp-collector active
contrail-topology active

The traceback is:

Traceback (most recent call last):
  File "/usr/bin/contrail-analytics-api", line 9, in <module>
    load_entry_point('opserver==0.1dev', 'console_scripts', 'contrail-analytics-api')()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 378, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2566, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/python2.7/site-packages/opserver/opserver.py", line 36, in <module>
    from analytics_db import AnalyticsDb
  File "/usr/lib/python2.7/site-packages/opserver/analytics_db.py", line 29, in <module>
    from cassandra.cluster import Cluster
  File "cassandra/cluster.py", line 23, in init cassandra.cluster (cassandra/cluster.c:70648)
ImportError: No module named concurrent.futures <<<<<<<<<<<<
Traceback (most recent call last):
  File "/usr/bin/contrail-analytics-api", line 9, in <module>
    load_entry_point('opserver==0.1dev', 'console_scripts', 'contrail-analytics-api')()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 378, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2566, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/python2.7/site-packages/opserver/opserver.py", line 36, in <module>
    from analytics_db import AnalyticsDb
  File "/usr/lib/python2.7/site-packages/opserver/analytics_db.py", line 29, in <module>
    from cassandra.cluster import Cluster
  File "cassandra/cluster.py", line 23, in init cassandra.cluster (cassandra/cluster.c:70648)
ImportError: No module named concurrent.futures

[Raj Reddy (rajreddy)]

per Arvind

This is seen on build 2704.
It does not have the latest python-cassandra packages in it. It should not be
seen post 2707.