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Salvatore Orlando 7da1724d44 Improve DB operations for quota reservation ... This patch deals with the lock wait timeout and the deadlock errors observed under high concurrency (api_workers >= 4) with the pymysql driver. It includes the following changes: - Stop setting dirty status for resource usage when creating reservation, as usage of reserved resources is not tracked anymore; - Add a variable, increasing delay when retrying make_reservation upon a DBDeadlock error in order to reduce the chances of further collisions; - Enable transaction retry upon DBDeadlock errors for set_quota_usage; - Do not resync quota usage while making reservation. This puts a lot of stress on the database and is also wasteful since resource usage is very likely to change again once the transaction is committed; - Use autonested_transaction to simplify logic around when the nested flag should be used. Change-Id: I7a335f9ebea3c0d6fee6e6b757554e045a66075c Closes-Bug: #1486134 Related-Blueprint: better-quotas		8 years ago
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__init__.py	Reservations support	8 years ago
resource.py	Improve DB operations for quota reservation	8 years ago
resource_registry.py	Improve DB operations for quota reservation	8 years ago