Public bug reported:
resource_versions were included into agent state reports recently to support
rolling upgrades (commit 97a272a892fcf488949eeec4959156618caccae8)
The downside is that it brought additional processing when handling state
reports on server side: update of local resources versions cache and more
seriously rpc casts to all other servers to do the same.
All this led to a visible performance degradation at scale with hundreds
of agents constantly sending reports. Under load (rally test) agents may
start "blinking" which makes cluster very unstable.
Need to optimize agents notifications about resource_versions.
** Affects: neutron
Importance: High
Assignee: Oleg Bondarev (obondarev)
Status: In Progress
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https://bugs.launchpad.net/bugs/1567497
Title:
resource_versions in agents state reports led to performance
degradation
Status in neutron:
In Progress
Bug description:
resource_versions were included into agent state reports recently to support
rolling upgrades (commit 97a272a892fcf488949eeec4959156618caccae8)
The downside is that it brought additional processing when handling state
reports on server side: update of local resources versions cache and more
seriously rpc casts to all other servers to do the same.
All this led to a visible performance degradation at scale with
hundreds of agents constantly sending reports. Under load (rally test)
agents may start "blinking" which makes cluster very unstable.
Need to optimize agents notifications about resource_versions.
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https://bugs.launchpad.net/neutron/+bug/1567497/+subscriptions
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