[MongoDB] Using a aggregation pipeline framework instead of map-reduce

Registered by Ilya Tyaptin

Using a aggregation pipeline framework in "statistics" request may improve performance of this request up to 10 times.

Blueprint information

Status:
Complete
Approver:
Nadya Privalova
Priority:
Low
Drafter:
Ilya Tyaptin
Direction:
Approved
Assignee:
Ilya Tyaptin
Definition:
Approved
Series goal:
Accepted for liberty
Implementation:
Implemented
Milestone target:
milestone icon 5.0.0
Started by
Nadya Privalova
Completed by
gordon chung

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Gerrit topic: https://review.openstack.org/#q,topic:bp/mongodb-aggregation-pipeline,n,z

Addressed by: https://review.openstack.org/168349
    Spec for using a aggregation pipeline in MongoDB

Addressed by: https://review.openstack.org/172340
    [MongoDB] Use a aggregate pipeline in statistics

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