launchpad-dev team mailing list archive

[Ian Clatworthy <ian.clatworthy@xxxxxxxxxxxxx>]

Michael Hudson wrote:

> Speaking more generally, the problem is the revision cache -- can we
> make it go away, or at least handle it better?  I always forget why we
> actually need it, so let's try to recap:
> 
>  1. Going from revid -> revno.  Loggerhead does this a lot.
>  2. Going from revno -> revid.  Probably done ~once per page.
>  3. In History.get_revids_from().  This gets into behaviour territory.
> Basically it "mainline-izes" a bunch of revisions.  It can probably
> touch quite a lot of the graph.
>  4. get_merge_point_list().  I can't remember what this does :(
>  5. get_short_revision_history_by_fileid().  Just uses it to get the set
> of all revids in the branch.

Can my bzr-historycache plugin help? My understanding is that it's less
useful than before 2a (and may even need some TLC right now) but it's
designed to partially fix this sort of thing.

Ian C.