567dbe1867
The /os-hypervisors/detail API endpoint was experiencing significant performance issues in environments with many compute nodes when using microversion 2.88 or higher, as it made sequential RPC calls to gather uptime information from each compute node. This change optimizes uptime retrieval by: * Adding uptime to periodic resource updates sent by nova-compute to the database, eliminating synchronous RPC calls during API requests * Restricting RPC-based uptime retrieval to hypervisor types that support it (libvirt and z/VM), avoiding unnecessary calls that would always fail * Preferring cached database uptime data over RPC calls when available Closes-Bug: #2122036 Assisted-By: Claude <noreply@anthropic.com> Change-Id: I5723320f578192f7e0beead7d5df5d7e47d54d2b Co-Authored-By: Sylvain Bauza <sbauza@redhat.com> Signed-off-by: Sean Mooney <work@seanmooney.info>
24 lines
1.1 KiB
YAML
24 lines
1.1 KiB
YAML
---
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fixes:
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Fixed performance issue with the ``/os-hypervisors/detail`` API endpoint
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when using microversion 2.88 or higher. The API was making sequential RPC
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calls to each compute node to gather uptime information, causing significant
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delays in environments with many compute nodes (LP#2122036).
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The fix optimizes uptime retrieval by:
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* Adding uptime information to the periodic resource updates sent by
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nova-compute to the database, eliminating the need for synchronous RPC
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calls during API requests
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* Only attempting RPC-based uptime retrieval for hypervisor types that
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actually support it (libvirt and z/VM), avoiding unnecessary calls to
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other hypervisor types that would always return NotImplementedError
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* Preferring cached uptime data from the database over RPC calls when
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available, this updates at the cadence specified by
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`[DEFAULT]update_resources_interval` which is the same interval the
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other hypervisor stats update.
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This change significantly reduces response times for the hypervisor detail
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API in large deployments while maintaining backward compatibility.
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