Introduce MySQL thread pool so that DB calls do not block the whole process

Registered by Sridevi Koushik

Add eventlet db_pool use for mysql

This adds the use of eventlet's db_pool module so that we can make mysql
calls without blocking the whole process.

New config options introduced are:

use_tpool -- Enables the use of eventlet's db_pool
backend - The backend to be used for DB

The default for use_tpool is False , so there is
no forced behavior changes for those using mysql.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
Sridevi Koushik
Definition:
New
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Mark Washenberger
Completed by
Mark Washenberger

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/mysql-thread-pool,n,z

Addressed by: https://review.openstack.org/41092
    Introduced Mysql thread pool

Addressed by: https://review.openstack.org/41664
    Syncing DB pool api modules from oslo-incubator

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Work Items

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