![]() GC needs to get a ReflogReader for all existing refs to list all objects referenced from reflogs. The existing Repository#getReflogReader method accepts the ref name and then resolves the Ref to create a ReflogReader. GC calling that for a huge number of Refs one by one is very slow. GC first gets all Refs in bulk and then calls getReflogReader for each of them. Fix this by adding another getReflogReader method to Repository which accepts a Ref directly. This speeds up running JGit gc on a mirror clone of the Gerrit repository from 15:36 min to 1:08 min. The repository used in this test had 45k refs, 275k commits and 1.2m git objects. Change-Id: I474897fdc6652923e35d461c065a29f54d9949f4 |
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