SchedulingDefault_spec.js fails with Node v6.8.0 (setImmediate problem)

[kirrg001]

We suddenly have a broken build https://travis-ci.org/TryGhost/Ghost/jobs/167170509.

grunt test:core/test/unit/scheduling/SchedulingDefault_spec.js fails on Node v6.8.0

The last job never get's executed, because setImmediate does not get triggered!

[kirrg001]

https://github.com/nodejs/node/blob/master/doc/changelogs/CHANGELOG_V6.md#6.8.0
nodejs/node#8655

[kirrg001]

weird weird.

When i decrease the timeout diff from diff - 200 to for example diff - 70, then it works.
diff is the difference between the next job and now. And 200 tells the timer to wake up 200ms before, because setTimeout is not accurate.

So if the timeout get's invoked earlier to now, then it works?

https://github.com/TryGhost/Ghost/blob/master/core/server/scheduling/SchedulingDefault.js#L173

[marcuspoehls]

We’ve noticed the same kind of issue with post scheduling: if there are at least 3 schedules, the scheduler won’t publish (at least) the last one.

Used Setup

• Node.js: 4.5.0
• Ghost: 0.11.1
• Database: MySQL
• Steps to reproduce: local Ghost setup with post scheduling available, requires Ghost 0.9.0 or later. Then create 3 posts, schedule them with 11 minutes time difference and let the scheduler publish them. In our setup, the scheduler didn’t recognize the third post.

[kirrg001]

@marcuspoehls I can't reproduce what you are describing.

In our setup, the scheduler didn’t recognize the third post.

What do you mean by saying "didn’t recognize the third post"?
So you schedule the third post and then it remains in status "scheduled"?

[Fishrock123]

Node issue at nodejs/node#9084