Depending on the network setup, it may make sense to use a block size other than the 1MB default value. Currently, this value is not configurable. This is an RFE to make that configurable.
https://lists.fedorahosted.org/archives/list/koji-devel@lists.fedorahosted.org/thread/T54Z4DRUCVY3RGUGPCWZMTTVFU5FNTLQ/
Fixed by commit acbe00ff1b570d089f4e09dd5760ce0385c0e487
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/koji/koji/issues/30
Please continue any further discussion there.