[ClusterLabs] Pacemaker 1.1.17 Release Candidate 4 (likely final)

[Ken Gaillot]

The fourth, and likely final, release candidate for Pacemaker version
1.1.17 is now available at:

https://github.com/ClusterLabs/pacemaker/releases/tag/Pacemaker-1.1.17-rc4

If no regressions are reported with this candidate, it will likely be
the basis of the final 1.1.17 release.

The most significant change in this release is a new cluster option to
improve scalability.

As users start to create clusters with hundreds of resources and many
nodes, one bottleneck is a complete reprobe of all resources (for
example, after a cleanup of all resources). This can generate enough CIB
updates to get the crmd's CIB connection dropped for not processing them
quickly enough.

This bottleneck has been addressed with a new cluster option,
cluster-ipc-limit, to raise the threshold for dropping the connection.
The default is 500. The recommended value is the number of nodes in the
cluster multiplied by the number of resources.

Another change worth mentioning is that the new bundle resource type can
now be included in location and colocation constraints.

There were also multiple bugs fixed. Details are in the change log.

Testing and feedback are encouraged, as this will likely be the final
release.
-- 
Ken Gaillot <kgaillot at redhat.com>