Task #2527
Updated by bmbouter over 7 years ago
h3. Problem python-celery was recently upgrade from 3.1.20-3 to 4.0.2-1 on Fedora fedora rawhide [0]. Celery 4 has some backwards incompatible changes that affect Pulp's usage of celery. This means that until we update Pulp 2.y 2 to work with Celery celery 4.0.z Pulp will not be able to work with be installed from rawhide (and F26). There are at least 2 problems, but there may be more. * Tasks with reservation won't work because the the dedicated queue name was changed from C.dq (celery 3.1.z) to C.dq2 (celery 4.0). That variable is "set here":https://github.com/pulp/pulp/blob/91a1e28c9e7d3dee418d5c7680dbf25c3e7adc63/server/pulp/server/async/celery_instance.py#L23. * Tasks are no longer lost upon worker restart. This opens the door for us to fix #489 with Pulp3, but for 2.y (this issue) we need to perform regression testing regarding task cancellation. Note that we cannot fix #489 on Pulp2 unless all distributions were to switch to celery 4 which is not in the plan currently. h3. Solution Pulp3 already works with celery 4.0.z, however it is unlikely to make the F26 beta freeze date of 4-25. So in the interim we need to update pulp2 to work with python-celery 4.0.z It also has to maintain compatibility with python-celery 3.1.z which will continue to be used on EL7, and F25-. [0] https://apps.fedoraproject.org/packages/python-celery
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