Harald Jensas 59520d6006 Add retry decorator update_segment_host_mapping() ... When multiple agents register at the same time there is a possible race condition causing segment host mappings updates to fail. StaleDataError raised by SQLAlchemy ORM. Adding retry_if_session_inactive() decorator to the method fixes the issue. Also serialize the method with lockutils. It takes 25+ seconds to update segment host mappings for 10 agents with the retry decorator alone. With the method serialized the same operation completes in less than 1 second. The retry decorator is still required for active/active scenarios. Closes-Bug: #1743579 Change-Id: I616457f094d000a4016c610b454be8269d9b4948 (cherry picked from commit f84781f246)		2018-01-23 19:33:59 +00:00
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__init__.py	Basic Extension and CRUD for Segments	2016-05-05 13:58:34 -06:00
db.py	Add retry decorator update_segment_host_mapping()	2018-01-23 19:33:59 +00:00
exceptions.py	Enable create and delete segments in ML2	2016-08-28 01:24:56 -04:00
placement_client.py	Honor the common session options for the placement API	2017-06-09 15:32:03 +02:00
plugin.py	Make code follow log translation guideline	2017-08-14 10:53:33 -07:00