548f3ff208
Address various minor issues from https://review.openstack.org/#/c/565604/ Change-Id: I69df4c8d8c4b8813f78aeeb46f7b788d36238d35 Blueprint: add-consumer-generation
19 lines
1.1 KiB
YAML
19 lines
1.1 KiB
YAML
---
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features:
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- |
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Adds a new ``generation`` column to the consumers table. This value is
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incremented every time allocations are made for a consumer. The new
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placement microversion 1.28 requires that all ``POST /allocations`` and
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``PUT /allocations/{consumer_uuid}`` requests now include the
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``consumer_generation`` parameter to ensure that if two processes are
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allocating resources for the same consumer, the second one to complete
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doesn't overwrite the first. If there is a mismatch between the
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``consumer_generation`` in the request and the current value in the
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database, the allocation will fail, and a 409 Conflict response will be
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returned. The calling process must then get the allocations for that
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consumer by calling ``GET /allocations/{consumer}``. That response will now
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contain, in addition to the allocations, the current generation value for
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that consumer. Depending on the use case, the calling process may error; or
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it may wish to combine or replace the existing allocations with the ones it
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is trying to post, and re-submit with the current consumer_generation.
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