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Ceiloemeter statistics query with API gets 503 error

Whenever I make any ceilometer query that deals with huge amount of data, it fails with error, Service not available.

  1. I do not get any error message in any ceilometer logs.
  2. Ceilometer api log show 200 response to query, but ceilometer client give 503 error.
  3. For short amount of data, everything works well.
  4. For queries dealing large amount of data, i get error File "/usr/lib/python2.7/dist-packages/ceilometerclient/openstack/common/apiclient/client.py", line 201, in request raise exceptions.from_response(resp, method, url) ceilometerclient.openstack.common.apiclient.exceptions.ServiceUnavailable: Service Unavailable (HTTP 503)
  5. no error in mongodb logs too.

can you please suggest what could be possible reasons for the issue?