Dear colleagues, I am currently working on the issue https://pulp.plan.io/issues/6121. It was reported that syncs of very large repositories take a huge amount of time compared to Pulp 2.
I profiled the code and realized that that we are repeatedly fetching data from the database in a loop and manually excluding units which should not be added to a repository mirrored by Pulp. Today, I submitted a PR (https://github.com/pulp/pulpcore/pull/565) that may resolve this issue. Instead of the aforesaid loop, there is now used a single database call which does the same thing, I suppose. Please, focus on the last note https://pulp.plan.io/issues/6121#note-11 to better understand my findings. Also, do not hesitate to review the submitted PR. Thank you!
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