On 2019-08-20 09:44:23 -0700, Andres Freund wrote: > On 2019-08-20 21:02:18 +1200, Thomas Munro wrote: > > Aside from code changes based on review (and I have more to come of > > those), the attached experimental patchset (also at > > https://github.com/EnterpriseDB/zheap/tree/undo) has a new protocol > > that, I hope, allows for better concurrency, reliability and > > readability, and removes a bunch of TODO notes about questionable > > interlocking. However, I'm not quite done figuring out if the bufmgr > > interaction is right and will be manageable on the undoaccess side, so > > I'm hoping to get some feedback, not asking for anyone to rebase on > > top of it yet. > > > > Previously, there were two LWLocks used to make sure that all > > discarding was prevented while anyone was reading or writing data in > > any part of an undo log, and (probably more problematically) vice > > versa. Here's a new approach that removes that blocking:
Oh, more point I forgot to add: Cool!
