openstack/watcher
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Releasenote for decision engine threadpool

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Add the releasenote for the general purpose decision engine threadpool.
Including config parameters and how contributors can find relevant
documentation.

Implements: blueprint general-purpose-decision-engine-threadpool

Change-Id: I3560069b4e34f13305950559a0f05f7921f7867e
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Dantali0n 2019-11-25 15:21:15 +01:00 committed by licanwei
parent 42fea1c568
commit ba43f766b8
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releasenotes/notes/general-purpose-decision-engine-threadpool-0711b23abfc9d409.yaml Normal file
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---
prelude: >
Many operations in the decision engine will block on I/O. Such I/O
operations can stall the execution of a sequential application
significantly. To reduce the potential bottleneck of many operations
the general purpose decision engine threadpool is introduced.
features:
- |
A new threadpool for the decision engine that contributors can use to
improve the performance of many operations, primarily I/O bound onces.
The amount of workers used by the decision engine threadpool can be
configured to scale according to the available infrastructure using
the `watcher_decision_engine.max_general_workers` config option.
Documentation for contributors to effectively use this threadpool is
available online:
https://docs.openstack.org/watcher/latest/contributor/contributor/concurrency.rst
- |
The building of the compute (Nova) data model will be done using the
decision engine threadpool, thereby, significantly reducing the total
time required to build it.