[ClusterLabs] Antw: [EXT] Coming in Pacemaker 2.1.6: node attribute enhancements

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Tue Feb 7 01:57:25 EST 2023

>>> Ken Gaillot <kgaillot at redhat.com> schrieb am 06.02.2023 um 16:29 in Nachricht
<1fc864736b788762d00fbc0b78da1b34fc1137d3.camel at redhat.com>:
> Hi all,
> Node attributes will receive several enhacements in the Pacemaker 2.1.6
> release, expected in late May. They are available now in the main
> branch.
> A longstanding request to support transient utilization attributes has
> been implemented. Utilization attributes are used to assign resources
> to nodes based on local metrics such as CPU cores, RAM size, etc.
> Previously, these metrics could only be specified as permanent node
> attributes. As of 2.1.6, they can be set as transient node attributes
> as well (which last only until the cluster is restarted on the node).

Can you explain the advantages of that change?

> Separately, attrd_updater will now support the -P/--pattern option to
> modify all attributes whose name matches a given pattern. Previously,
> only crm_attribute had the option.
> attrd_updater and crm_attribute also both get a new -W/--wait option
> that can be set to "no", "local", or "cluster" when changing an
> attribute value.
> With --wait=no (the default), the current behavior is preserved: the
> command returns as soon as the request has been submitted to the
> attribute manager.
> With --wait=local, the tool will not return until the new value has
> been set locally. That is, a query run on the same node would return
> the new value.
> With --wait=cluster, the tool will not return until the new value has
> been set on all nodes. That is, a query on any node would return the
> new value.
> The --wait option will benefit scripts and resource agents that need
> specific guarantees. The feature set can be compared against 3.17.4 to
> determine support.
> -- 
> Ken Gaillot <kgaillot at redhat.com>
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