On 04/04/2025 02:42, Chuck Caldarale wrote:
On 2025 Apr 3, at 19:57, Tim N <tnti...@gmail.com> wrote:
For a long time up to the latest version 11 documentation, there has been a
recommended maximum limit of 4 nodes per cluster.
https://tomcat.apache.org/tomcat-11.0-doc/cluster-howto.html
"This works great for smaller clusters, but we don't recommend it for
larger clusters — more than 4 nodes or so."
Are there any plans to improve this?
It's a pity to have to change the architecture when going from, say, 3
notes to 8 by introducing farms. What is the next simplest free cluster to
move to? Redis? Any idea how cluster farming compares with redis?
What other options are there?
I may be misreading the documentation, but I think the 4-node restriction
applies to the DeltaManager, and using the BackupManager removes the limitation.
Chuck is correct. The issue with the DeltaManager is that the cluster
traffic scales with the square of the number of nodes. For the
BackupManager traffic scales linearly with the number of nodes.
The limit of 4 is one of those values that should work with most
applications. Depending on your application, the actual limit may be higher.
Mark
- Chuck
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