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Commit 7ca655e4 authored by Siddharth Agarwal's avatar Siddharth Agarwal
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git_handler: don't compute tags for each tag imported

Previously we'd recompute the repo tags each time we'd consider importing a Git
tag. This is O(n^2) in the number of tags and produced noticeable slowdowns in
repos with large numbers of tags.

To fix this, compute the tags just once. This is correct because the only case
where we'd have issues is if multiple new Git tags with the same name were
introduced, which can't happen because Git tags cannot share names.

For a repository with over 200 tags, this causes a no-op hg pull to be sped up
by around 0.5 seconds.
parent dd8733d2
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