The Gearman project has been slowly migrating from C to C++. This migration has gone under the radar due to the popularity of Cent OS 5 and given gearmand version of 0.14. This version of gearmand worked with any version of pecl/gearman and there was never any compelling reason to upgrade gearmand. That changed with the release of pecl/gearman 1.0

Gearman is one of my favorite technologies to use. So much in fact that I recently decided to take over the maintenance of pecl/gearman. While asynchronous tasks are a great feature, I find the ability to run multiple tasks in parallel to be much more useful. One of the biggest shortcomings of this approach was that uncaught worker exceptions would be treated as a successful completion of a job. I used to wrap all my workers in a generic try/catch block to prevent this from happening.  With the latest commits to pecl/gearman, I can now use the exception callback to properly track the exceptions.

The gearman job queue is great for farming out work.  After reading a great post about Poison Jobs, I limited the number of attempts the gearman daemon will retry a job.  This seemed fairly straight-forward to me: if a job fails, then the gearman daemon will retry the job the specified number of times.  I learned the hard way that it was not that simple.  There is specific criteria the gearman daemon follows in order to retry a job.