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Que is a high-performance job queue that improves the reliability of your
application by protecting your jobs with the same ACID guarantees as the rest of
your data.
Que is a queue for Ruby and PostgreSQL that manages jobs using advisory locks,
which gives it several advantages over other RDBMS-backed queues:
- Concurrency - Workers don't block each other when trying to lock jobs, as
often occurs with "SELECT FOR UPDATE"-style locking. This allows for very high
throughput with a large number of workers.
- Efficiency - Locks are held in memory, so locking a job doesn't incur a disk
write. These first two points are what limit performance with other queues.
Under heavy load, Que's bottleneck is CPU, not I/O.
- Safety - If a Ruby process dies, the jobs it's working won't be lost, or left
in a locked or ambiguous state - they immediately become available for any
other worker to pick up.
WWW: https://github.com/que-rb/que
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