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    <p>Let's first assume you mean <a href="http://quartz-scheduler.org" rel="noreferrer">Quartz, a scheduler</a>, not <a href="http://en.wikipedia.org/wiki/Quartz_%28graphics_layer%29" rel="noreferrer">Quartz, a Mac OS X graphics layer</a>. ;)</p> <ul> <li><a href="http://rabbitmq.com" rel="noreferrer">RabbitMQ</a> is a message queue. Message queues make sure messages reach their destination, persisting during downtimes and load-balancing between multiple worker processes. You generally want a message queue if you have several processes doing different types of work and you need a way to distribute the work load.</li> <li>Quartz is a scheduler. Schedulers make sure events happen at the right time, possibly ensuring one event is properly executed before another may start, or catching up with the schedule after a downtime. You generally want a scheduler if the basic OS capabilities like crontab etc. are not sufficient for your needs.</li> </ul> <p>Combining the two concepts can be powerful: have the scheduler trigger events or chains of events into the message queue, and have many workers listen on their respective queues to perform the assigned tasks.</p> <p>Depending on what you want to achieve, it may be perfectly ok to have everything on the same machine. When you experience poor performance you can decide if you want a bigger machine or distribute the work load on many smaller ones.</p> <p>You may want to look at the tutorials on RabbitMQ's and Quartz's web sites to see if either or both things are right for your purpose.</p>
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    1. POQuartz and rabbitMQ, which is the difference?
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