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Default native threading for sch, api and metadata

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This patch switches the default concurrency mode to native threading
for the services that gained native threading support in Flamingo:
nova-scheduler, nova-api, and nova-metadata.

The OS_NOVA_DISABLE_EVENTLET_PATCHING env variable still can be used to
explicitly switch the concurrency mode to eventlet by

  OS_NOVA_DISABLE_EVENTLET_PATCHING=false

We also ensure that the cover, docs, py3xx and functional tox targets
are still running with eventlet while py312-threading kept running
with native threading.

Change-Id: I86c7f31f19ca3345218171f0abfa8ddd4f8fc7ea
Signed-off-by: Balazs Gibizer <gibi@redhat.com>
This commit is contained in:
Balazs Gibizer
2025-11-03 13:25:55 +01:00
parent 0afb72e883
commit 35207ee8b5
8 changed files with 71 additions and 13 deletions
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doc/source/admin/concurrency.rst
+12 -5
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@@ -21,14 +21,21 @@ up support for the native threading mode.
Selecting concurrency mode for a service
----------------------------------------
Nova still uses Eventlet by default, but allows switching services to native
threading mode at service startup via setting the environment variable
``OS_NOVA_DISABLE_EVENTLET_PATCHING=true``.
Since nova 33.0.0 (2026.1 Gazpacho) the nova-scheduler, nova-api, and
nova-metadata are using native threading by default. The rest of the
services are using eventlet by default in this release. The concurrency mode
can be configured via setting the environment variable
``OS_NOVA_DISABLE_EVENTLET_PATCHING``. Setting that variable to ``true``
requests the native threading mode while setting it to ``false`` requests the
eventlet mode. If the variable is not set the above default is applied.
.. note::
Since nova 32.0.0 (2025.2 Flamingo) the nova-scheduler, nova-metadata,
nova-api, and nova-conductor can be switched to native threading mode.
Since nova 32.0.0 (2025.2 Flamingo) the nova-scheduler, nova-metadata, and
nova-api can be switched to native threading mode.
Since nova 33.0.0 (2026.1 Gazpacho) also the nova-conductor can be switched
to native threading mode.
Tunables for the native threading mode