Recently , I encountered with a problem of building as follow :
When I request 4 or 5 packages for building at a time , my buildsys run normally.
but when I request 20 (for example), It just builds 4 or 5 of them and then the left
always  stay in open or free state. then, I cancel those then resubmit 4 or 5 packages
of them , they are built normally and quickly .
Additionally, I succeed to build hundreds of packages at a time before.
Thus, I guess whether the koji-hub stop scheduling or build hosts outage?