jbertram opened a new pull request #3934:
URL: https://github.com/apache/activemq-artemis/pull/3934
JGroups 3.x hasn't been updated in some time now. The last release was
in April 2020 almost 2 years ago. Since then there's been 35 releases
from 4.x and 5.x. Lots of protocols have been updated and added and
users are wanting to use them. Multiple Jiras have been opened to
upgrade:
- https://issues.apache.org/jira/browse/ARTEMIS-2413
- https://issues.apache.org/jira/browse/ARTEMIS-2436
- https://issues.apache.org/jira/browse/ARTEMIS-3066
Notably, there is concern over the security of using older components
triggered mainly by the recent Log4Shell vulnerability discovered in
Log4j 2.x. The upgrade is meant to deal with all these issues.
However, there is a cost associated with upgrading.
The old-style properties configuration is no longer supported. I think
it's unlikely that end-users are leveraging this because it is not
exposed via broker.xml. The JGroups XML configuration has been around
for a long time, is widely adopted, and is still supported. I expect
most (if not all) users are using this. However, a handful of tests
needed to be updated and/or removed to deal with this absence.
Some protocols and/or protocol properties are no longer supported. This
means that users may have to change their JGroups stack configurations
when the upgrade. For example, our own clustered-jgroups example had to
be updated or it wouldn't run properly.
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