release-notes/4.2.1.md
RabbitMQ 4.2.1 is a maintenance release in the 4.2.x release series.
It is strongly recommended that you read 4.2.0 release notes
in detail if upgrading from a version prior to 4.2.0.
RabbitMQ and Erlang/OTP Compatibility Matrix has more details on Erlang version requirements for RabbitMQ.
Nodes will fail to start on older Erlang releases.
Release notes can be found on GitHub at rabbitmq-server/release-notes.
Quorum queue at-most-once dead lettering for the overflow behaviour drop-head now happens in the correct order.
GitHub issue: #14926
Feature flag state in the registry and on disk were not consistent for a period of time during node boot.
GitHub issue: #14943
stream.read_ahead is a new setting that controls how much data is prefetched from disk
for stream reads (consumption).
GitHub issue: #14948/
Stream deletion is now more resilient and can handle certain mid-deletion failure scenarios.
GitHub issue: #14852
The dashboards were updated for RabbitMQ 4.2.x.
GitHub issue: #14849
GET /api/queues/{vhost} requests no longer perform unnecessary virtual host permission checks
and log less (at debug level) as a result.
GitHub issue: #14923
Improved target node resource alarm handling for AMQP 1.0 and local shovels.
GitHub issue: #14886
Local shovels could run into an exception that would cause a shovel restart.
GitHub issue: #14872
AMQP 1.0 shovels ignored the sasl URI parameter.
GitHub issue: #14867
A usability improvement allows the plugin to automatically load the trusted system x.509 (TLS) certificates.
GitHub issue: #14927
A usability improvement allows the plugin to automatically load the trusted system certificates when the user only enables TLS for the LDAP client but does not configure any other settings.
GitHub issue: #14937
cuttlefish was upgraded to 3.6.0