Yes. RabbitMQ uses Erlang's built-in logging and database support tools to provide high-speed, high-reliability durable message storage. For storage in your own RDBMS, please see this FAQ entry.

From our testing, we expect easily-achievable throughputs of 4000 persistent, non-transacted one-kilobyte messages per second (Intel Pentium D, 2.8GHz, dual core, gigabit ethernet) from a single RabbitMQ broker node writing to a single spindle.

RabbitMQ enables developers of messaging solutions to take advantage of not just AMQP but also one of the most proven systems on the planet. The Open Telecom Platform (OTP) is used by multiple telecommunications companies to manage switching exchanges for voice calls, VoIP and now video. These systems are designed to never go down and to handle truly vast user loads.

Yes. RabbitMQ implements AMQP's "TX" message class, which provides atomicity and durability properties to those clients that request them.

RabbitMQ is free software in both the gratis and libre senses, licenced under the Mozilla Public License.

There is no explicit support in the JDK applet API for persistent state on the client side. However, an applet can maintain its own persistent state on the server side. That is, it can create files on the server side and read files from the server side.

Non-persistent oil means a petroleum-based oil that, at the time of shipment, consists of hydrocarbon fractions: of which at least 95% (by volume) distills at a temperature of 370 degrees C (or 700 degrees F). Typical non-persistent oils include MGO, MDO, kerosene, no.2 diesel, aviation gasoline, and hydraulic fluids. Persistent oil means petroleum-based oils that do not meet the distillation criteria for non-persistent oils.

Saga is set in a persistent world. A persistent world is one where your actions today influence what you can do tomorrow. Unlike many RTS games where you begin fresh each game, Saga does not end when you log off. Your kingdom remains in the world of Saga waiting for you to return.

Proteinuria can be transient and not associated with renal disease, therefore, it must be determined to be persistent. Persistent renal proteinuria in nonazotemic animals is a sign of early renal disease. After the urine protein is localized to the kidney and evidence of lower urinary tract disease is not identified, it must be determined to be persistent. Persistence in nonazotemic animals is determined by identifying proteinuria on three or more occasions at least two weeks apart.

Kennametal.com maintains your commerce order (by login ID) in a persistent shopping cart. A persistent shopping cart environment exists once you place an order or add selected items from an order, contract, quote or favorites screen into the shopping cart. This allows you to maintain an ongoing shopping cart until you are ready to complete your order.

Persistent worlds are, unlike single player games, constantly active and evolving. Even after a player logs off the world will keep changing as other players log on. In Dreamlords this also means that every player exists in the same world and that resources and other items are depending on supply and demand within the world.

Yes, your character will continue from mission to mission, acquiring levels, items, skills and abilities. In addition, every character is stored on ArenaNet's servers, so no matter whether you play single player adventures, cooperative missions, or head-to-head battles, your character will be stored in a secure environment allowing you to log online to play from anywhere in the world.

The war rages on continuously in a 24/7 fashion on an international basis. Player characters gather certifications and implants or Command Abilities as they pursue their goals of taking more and more territory for their Empire. Also, enemies and friends will be made in these large communities as people gain reputations among their comrades and foes.

Some servers require fixed source IP addresses, and you may encounter problems cause by load balancing algorithms. Persistent Routing can help to avoid this kind of problem.

Persistent binding is a feature of HBAs which remembers the last SCSI address a particular Fibre Channel target has been mapped to. For example, that a port on a physical disk (world wide name 01:02:03:04:05:06:07, LUN 0) was last seen at SCSI address (bus=0,target=3,lun=0) on the operating system. Persistent binding ensures that this is consistent from reboot to reboot unless changed by the user.

Yes. RabbitMQ is built atop the industry-leading OTP Erlang libraries, which provides a solid foundation for building reliable software. The underlying system supporting the Rabbit codebase has been used by Ericsson to achieve nine nines (99.9999999%) of availability. Yes. RabbitMQ brokers can be made up of an arbitrary number of nodes, each of which is available for AMQP clients to connect to and interact with.

Yes. Erlang supports both single-node SMP configurations and configurations with multiple Erlang nodes running in a cluster within a single host.

AMQP uses SASL (see also Wikipedia on SASL) for authentication of AMQP clients. Our current support for SASL is limited to the PLAIN authentication mechanism; see our roadmap for our future SASL plans. Authorization is implemented in RabbitMQ using a distributed database table mapping users to virtual hosts and realms.

RabbitMQ is developed on Debian Linux and Mac OS X. As the server component is written in Erlang, and the client component in Java, it is platform-neutral. Erlang runs on the following platforms (taken from Erlang's FAQ):

At present, the RabbitMQ suite offers a client library for Java applications. Support for in-browser Javascript (via AJAX mechanisms, including JSON and JSON-RPC) and native Erlang client access is planned for the near future. We will develop client interfaces to RabbitMQ's features in response to demand.

The RabbitMQ client library is supplied as a JAR file, rabbitmq-client.jar, with a minimal number of external dependencies (currently backport-util-concurrent-2.2.jar, commons-io-1.2.jar, and commons-lang-2.0.jar).

Mule is an Enterprise Service Bus (ESB), which is an essential part of our roadmap for integration with other protocols and legacy networks. We plan on implementing an interface to allow HermesJMS to browse and manage queues on RabbitMQ brokers. Absolutely.

Yes: you can either run your client against our public demonstration server, or download and run a server of your own to experiment with.

RabbitMQ will be supported, both commercially and as an open-source project, by both LShift and by CohesiveFT as virtual appliances. For inquiries about support, please email support@rabbitmq.com. For inquiries specifically about virtual appliances, contact support@cohesiveft.com.

If you would like to explore other licensing options, please get in touch with us by emailing info@rabbitmq.com.

We're happy to hear from anyone who wants to get involved or is curious about how we intend to manage the project. We plan on making the RabbitMQ project's source code available via a public Subversion server shortly, although of course we welcome plain old patches, as well.

We hope that as RabbitMQ develops, it will be included with various operating systems and distributions. We already have packages available for Debian GNU/Linux; we are developing packages for integrating smoothly with Fedora Linux, Microsoft Windows and Apple Mac OS X, and hope that eventually our packages will be accepted into core OS distributions.