openstack/zaqar
Code Issues Proposed changes

Merge "Move marker field to the first position (index)"

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Jenkins 2014-10-08 16:47:10 +00:00 committed by Gerrit Code Review
commit afa547e9df
1 changed files with 11 additions and 2 deletions
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13
zaqar/queues/storage/mongodb/messages.py
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@ -97,10 +97,19 @@ CLAIMED_INDEX_FIELDS = [
('c.e', 1),
]
# Index used to ensure uniqueness.
# This index is meant to be used as a shard-key and to ensure
# uniqueness for markers.
#
# As for other compound indexes, order matters. The marker `k`
# gives enough cardinality to ensure chunks are evenly distributed,
# whereas the `p_q` field helps keeping chunks from the same project
# and queue together.
#
# In a sharded environment, uniqueness of this index is still guaranteed
# because it's used as a shard key.
MARKER_INDEX_FIELDS = [
(PROJ_QUEUE, 1),
('k', 1),
(PROJ_QUEUE, 1),
]
TRANSACTION_INDEX_FIELDS = [