rabbitmq-server/release-notes/3.6.3.md

RabbitMQ 3.6.3

RabbitMQ 3.6.3 is a maintenance release that includes bug fixes, packaging and build system enhancements.

As of 3.6.3, RabbitMQ also comes with several additional plugins in the distribution:

• rabbitmq_top, which helps identify (Erlang) processes that consume most RAM and CPU resources

• rabbitmq_trust_store which manages trusted client x509/TLS certificates

• rabbitmq_jms_topic_exchange which, together with RabbitMQ JMS Java client, provides support for the JMS 1.1 API atop RabbitMQ.

Breaking Changes

• Debian package now supports systemd and also drops support for some older distributions.

• All artifacts in this release are signed with a new 4096-bit OpenGPG key.

Known Issues on Erlang 19.0

An undocumented runtime metric change in Erlang 19.0 breaks management plugin.

Server

Bug Fixes

• (Newly elected) queue leader process could terminate immediately after promotion

  GitHub issue: rabbitmq-server#812

• Priority queue mirror could fail to synchronize after restart

  GitHub issues: rabbitmq-server#687, rabbitmq-server#802

• Shutdown timeouts for worker processes are now much more reasonable. Earlier the timeouts were virtually infinite which could lead to a deadlock during node shutdown.

  GitHub issue: rabbitmq-server#541

• Purging of a durable queue could result in undelivered publisher confirms. Contributed by Andreas Ländle.

  GitHub issue: rabbitmq-server#854

• Old incarnations of queue mirrors are now ensured to be stopped before new ones are started

  GitHub issue: rabbitmq-server#863

Enhancements

• systemd support in Debian and RPM packages

  Contributed by Alexey Lebedeff (Mirantis).

  GitHub issue: rabbitmq-server#570

• Debian repository and release artifacts are now signed with a new 4096-bit OpenGPG key

  GitHub issue: rabbitmq-server#718

• More resilient worker_pool, particularly important for LDAP plugin users

  GitHub issue: rabbitmq-server#834

• More efficient file handle management

  GitHub issue: rabbitmq-server#828

• Test suite ported to Common Test

  Plugin developers will be encouraged to port their test suites to Common Test in the future.

  GitHub issue: rabbitmq-server#725

• Compilation on Erlang/OTP 19.0.

  GitHub issue: rabbitmq-server#860

Management Plugin

Enhancements

• New API endpoint for reporting ETS tables memory consumption (absolute and relative)

  GitHub issue: rabbitmq-management#219

• Node information page now includes GC and context switching stats

  GitHub issue: rabbitmq-management#208

• Connection, channel, and queue information pages now include several runtime metrics

  GitHub issues: rabbitmq-management#209, rabbitmq-management#210, rabbitmq-management#211

• Node metrics now include information about how long it takes to obtain a file handle

  GitHub issue: rabbitmq-server#825

• Partial HTTPS support in rabbitmqadmin on Python versions older than 2.7.9

  GitHub issue: rabbitmq-management#225

Bug Fixes

• A channel statistics-related memory leak fixed.

  GitHub issue: rabbitmq-management#214

• Stats collectors event queue is now bounded (again)

  GitHub issue: rabbitmq-management#221

• Stats table name was logged as a tuple

  GitHub issue: rabbitmq-management#206

.NET Client

Bug Fixes

• Setting user-provided connection name didn't have an effect.

  GitHub issue: rabbitmq-dotnet-client#187

• IConnection#CreateModel could throw a NullPointerException due to a race condition.

  GitHub issue: rabbitmq-dotnet-client#185

• Connections with automatic recovery enabled ignored ports from the hostname list.

  GitHub issues: rabbitmq-dotnet-client#157, rabbitmq-dotnet-client#190

• Fixes an underflow in delivery tag handling after connection recovery

  Contributed by @harishvadali and @Entroper.

  GitHub issue: rabbitmq-dotnet-client#200

Enhancements

• New FAKE and Paket-based build tooling: development on OS X and Linux with Mono is now possible again.

  GitHub issue: rabbitmq-dotnet-client#169

LDAP Plugin

Enhancements

• Nested groups are now supported with a separate query type

  GitHub issue: rabbitmq-auth-backend-ldap#3

Bug Fixes

• Query failures (e.g. noSuchObject responses) from LDAP servers are now correctly treated as false in or and and queries instead of erroring.

  GitHub issue: rabbitmq-auth-backend-ldap#48

Trust Store Plugin

Bug Fixes

• Invalid/unparseable certificates no longer prevent other certificates from (re)loading

  GitHub issue: rabbitmq-trust-store#27

Enhancements

• Certificate verification now can validate only leaf certificates. This is more convenient in some cases. It will be one of the opt-in modes in future versions.

  GitHub issue: rabbitmq-trust-store#34

• The plugin now logs when a certificate is added (loaded) or removed (unloaded)

  GitHub issue: rabbitmq-trust-store#28

• The plugin now provides a function for listing trust store certificates via rabbitmqctl eval: rabbitmqctl eval 'io:format(rabbit_trust_store:list()).'

  GitHub issue: rabbitmq-trust-store#31

Erlang Client

Enhancements

• amqp_connection:close/4 is now exported

  GitHub issue: rabbitmq-erlang-client#59

Bug Fixes

• The client now compiles on Erlang/OTP 19.0

  GitHub issue: rabbitmq-erlang-client#41

Delayed Message Exchange Plugin

Enhacements

• Efficiency improvements when publications and delayed delivery happen concurrently.

  Contributed by Richard Larocque.

  GitHub issues: rabbitmq-delayed-message-exchange#51, rabbitmq-delayed-message-exchange#54