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## RabbitMQ 3.6.6
`3.6.6` is a maintenance release that includes a fix for an **important security vulnerability** ([CVE-2016-9877](https://pivotal.io/security/cve-2016-9877)) in the MQTT plugin.
### Upgrades and Compatibility
> :warning:
> **Upgrading from versions between 3.6.0 and 3.6.5 to this release requires a cluster shutdown.**
This is also true for versions prior to 3.6.0.
See the ["Upgrading clusters" section of the documentation](https://www.rabbitmq.com/clustering.html#upgrading).
### Server
#### Bug Fixes
* Changing queue mode to `lazy` could block queue process in certain circumstances.
GitHub issue: [rabbitmq-server#850](https://github.com/rabbitmq/rabbitmq-server/issues/850)
* Mirroring implementation didn't handle certain internal protocol messages arriving
out of order.
GitHub issue: [rabbitmq-server#922](https://github.com/rabbitmq/rabbitmq-server/issues/922)
* Mirror set changes weren't handled gracefully in certain circumstances (e.g. in the middle of a mirror promotion).
GitHub issue: [rabbitmq-server#914](https://github.com/rabbitmq/rabbitmq-server/issues/914)
* Mirrored queue could terminate after promotion if HA policy was reapplied during sync.
GitHub issue: [rabbitmq-server#803](https://github.com/rabbitmq/rabbitmq-server/issues/803)
* Autoheal partition handling mode could run into a multi-node deadlock.
GitHub issue: [rabbitmq-server#928](https://github.com/rabbitmq/rabbitmq-server/issues/928)
* Queue mirror group membership now correctly handles certain partial partition cases.
GitHub issues: [rabbitmq-server#950](https://github.com/rabbitmq/rabbitmq-server/issues/950),
[rabbitmq-server#953](https://github.com/rabbitmq/rabbitmq-server/issues/953)
* Eager queue sync will now stop as soon as a mirror shutdown/unavailability is detected.
GitHub issue: [rabbitmq-server#975](https://github.com/rabbitmq/rabbitmq-server/issues/975)
* Lazy queues now trigger runtime GC significantly less frequently, making moving data
to the message store more efficient.
GitHub issue: [rabbitmq-server#973](https://github.com/rabbitmq/rabbitmq-server/issues/973)
* Mirroring policies now respect the `nodes` parameter when re-electing a master.
GitHub issue: [](https://github.com/rabbitmq/rabbitmq-server/issues/990)
* After a partial network partitions, nodes with newly elected masters will now be more defensive
about the (no longer relevant) policy change notifications.
GitHub issue: [rabbitmq-server#1007](https://github.com/rabbitmq/rabbitmq-server/issues/1007)
* Late responses from peers in certain partial network partition scenarios are now
ignored by channels.
GitHub issue: [rabbitmq-server#1005](https://github.com/rabbitmq/rabbitmq-server/issues/1005)
* After a partial network partitions, nodes with newly elected masters will now be more defensive
about the (no longer relevant) synchronization start requests.
GitHub issue: [rabbitmq-server#1006](https://github.com/rabbitmq/rabbitmq-server/issues/1006)
* Network partition triggered late and duplicate acknowledgements are now ignored/filterd out
by queue leader processes.
GitHub issue: [rabbitmq-server#960](https://github.com/rabbitmq/rabbitmq-server/issues/960)
* Queue mirrors now try detect leader replica changes during partial partitions and do a clean stop
instead of failing because their state is in sync with the old leader and not the newly promoted one.
GitHub issue: [rabbitmq-server#944](https://github.com/rabbitmq/rabbitmq-server/issues/944)
* `rabbitmqctl` and server startup could be affected by some DNS configurations.
GitHub issue: [rabbitmq-server#890](https://github.com/rabbitmq/rabbitmq-server/issues/890)
* RPM package was split into two: for CentOS 6 and 7. The latter includes systemd support.
GitHub issue: [rabbitmq-server#932](https://github.com/rabbitmq/rabbitmq-server/issues/932)
* Workaround for Erlang/OTP bug OTP-13425 where crash dump generation failed on UNIX
platforms.
GitHub issue: [rabbitmq-server#956](https://github.com/rabbitmq/rabbitmq-server/issues/956)
#### Enhancements
* Inter-node traffic buffer increased to 32 MB by default, configurable with `RABBITMQ_DISTRIBUTION_BUFFER_SIZE` (in kilobytes).
This improves network bandwidth utilization for inter-node traffic and reduces the probability
of spurious network partitions due to latency spikes caused by the buffer being full.
GitHub issue: [rabbitmq-server#908](https://github.com/rabbitmq/rabbitmq-server/issues/908)
* Default flow control settings were increased to `{200, 100}`. This helps with consumer throughput
in some cases. The value still can be configured using the `rabbit.credit_flow_default_credit` setting.
GitHub issue: [rabbitmq-server#949](https://github.com/rabbitmq/rabbitmq-server/issues/949)
* `rabbitmqctl list_queues` now has more filtering options.
GitHub issue: [rabbitmq-server#851](https://github.com/rabbitmq/rabbitmq-server/issues/851)
* `RABBITMQ_IGNORE_SIGINT` is a new environment variable that lets the user disable the
`+B` VM flag that is known to have issues in Erlang 18.x series (prevents crash dumps from being produced).
GitHub issue: [rabbitmq-server#956](https://github.com/rabbitmq/rabbitmq-server/issues/956)
* The `pg2_fixed` module is now replaced by the standard `pg2` from a newer Erlang/OTP release.
GitHub issue: [rabbitmq-server#980](https://github.com/rabbitmq/rabbitmq-server/issues/980)
### MQTT Plugin
#### Bug Fixes
* Authentication with correct username but omitted password succeeded when TLS/x509
certificate wasn't provided by the client. CVE allocation for this vulnerability is pending.
GitHub issue: [rabbitmq-mqtt#96](https://github.com/rabbitmq/rabbitmq-mqtt/issues/96)
### JMS Topic Exchange Plugin
#### Bug Fixes
* The plugin no longer tries to check if JMS client's version is identical/compatible.
This caused certain legitimate use cases, such as exchange declaration over HTTP API, to fail.
GitHub issue: [rabbitmq-jms-topic-exchange#9](https://github.com/rabbitmq/rabbitmq-jms-topic-exchange/issues/9)
### Java Client
#### Bug Fixes
* Fixed a NPE that can occur when a thread attempts to create a new channel after a connection
has been recovered but before channel recovery has completed.
GitHub issue: [rabbitmq-java-client#197](https://github.com/rabbitmq/rabbitmq-java-client/pull/197)
Contributed by Michael Dent.
* Binding cache entries of auto-delete queues should be cleaned up when the last consumer is cancelled.
GitHub issue: [rabbitmq-java-client#199](https://github.com/rabbitmq/rabbitmq-java-client/pull/199)
Contributed by Michael Dent.
* When a channel is closed, consumers will be correctly cleaned up from AutorecoveringConnection cache.
GitHub issue: [rabbitmq-java-client#208](https://github.com/rabbitmq/rabbitmq-java-client/issues/208)
* `junit` is no longer listed as a dependency in the OSGi manifest
GitHub issue: [rabbitmq-java-client#211](https://github.com/rabbitmq/rabbitmq-java-client/issues/211)
#### Enhancements
* `com.rabbitmq.client.AddressResolver` is a new interface that can be used to "expand"
endpoints into groups of IP addresses, e.g. to a list of IP addresses resolved from a DNS
record.
GitHub issue: [rabbitmq-java-client#153](https://github.com/rabbitmq/rabbitmq-java-client/issues/153)
* Building on the new `AddressResolver` interface, the client now includes a resolver
that uses DNS SVR records to discover endpoints.
GitHub issue: [rabbitmq-java-client#104](https://github.com/rabbitmq/rabbitmq-java-client/issues/104)
* `com.rabbitmq.client.BuiltinExchangeType` is an enum that contains built-in exchange types.
GitHub issue: [rabbitmq-java-client#150](https://github.com/rabbitmq/rabbitmq-java-client/issues/150)
### .NET Client
#### Bug Fixes
* Fixed a possible `NullReferenceException` in `HeartbeatReadTimerCallback` during
connection closure.
GitHub issue: [rabbitmq-dotnet-client#257](https://github.com/rabbitmq/rabbitmq-dotnet-client/issues/257)
* Fixed a potential race condition in `EventingBasicConsumer`
GitHub issue: [rabbitmq-dotnet-client#242](https://github.com/rabbitmq/rabbitmq-dotnet-client/issues/242)
### Federation Plugin
#### Enhancements
* Federation links now specify a name which makes them easier to tell from other connections
in the management UI (requires RabbitMQ 3.6.3+).
GitHub issue: [rabbitmq-federation#39](https://github.com/rabbitmq/rabbitmq-federation/issues/39)
### Shovel Plugin
#### Enhancements
* Shovel connections now specify a name which makes them easier to tell from other connections
in the management UI (requires RabbitMQ 3.6.3+).
GitHub issue: [rabbitmq-shovel#19](https://github.com/rabbitmq/rabbitmq-shovel/issues/19)
## Release Artifacts
Available from:
* GitHub (see below)
* [Bintray](https://bintray.com/rabbitmq/)
* [Package Cloud](https://packagecloud.io/rabbitmq/)
* [rabbitmq.com](https://www.rabbitmq.com/download.html)
## Upgrading
To upgrade a non-clustered RabbitMQ simply install the new version. All configuration and persistent message data are retained. When upgrading using definitions export/import from versions earlier than 3.6.0, see http://rabbitmq.com/passwords.html.
To upgrade a RabbitMQ cluster, follow the instructions [in RabbitMQ documentation](https://www.rabbitmq.com/clustering.html#upgrading).
## Source code archives
**Warning**: The source code archive provided by GitHub only contains the source of the broker,
not the plugins or the client libraries. Please download the archive named `rabbitmq-3.6.6.tar.gz`.
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