Getting Quartz.net to ignore misfires

Question

I\'m building a windows service which is performing a scheduled task which processes a queue of commands (from a legacy system) at a regular interval (once per min) using Quartz

Answer 1

WithMisfireHandlingInstructionIgnoreMisfires() is the wrong method for what you want, it doesn't mean the job will not trigger misfires, it means it will fire all triggers that were missed as soon as possible and will then go back to ordinary schedule. Which is what you see happening.

What you need is WithMisfireHandlingInstructionNextWithRemainingCount(). This will signal the scheduler to ignore misfires and wait for the next scheduled time. Misfiring strategies can be a bit confusing, for a concise explanation look here (it's for the java scheduler but it doesn't matter).

Even with the right strategy, you need to understand how the misfire threshold works- if you get it wrong your misfired trigger may still fire.

From the documentation: "A misfire is the time span by which a trigger must have missed its next-fire-time, in order for it to be considered "misfired" and thus have its misfire instruction applied".

You've set the value to 600000 milliseconds (and this value is for all triggers, unfortunately there is no threshold per trigger)- the misfire strategy will only be applied if your trigger fires 600000 milliseconds after the time it should have been fired. You can lower or increase it according to your requirement.

For more about the misfire threshold, read here.