[PATCH] lib: Fix gencache_del
Volker.Lendecke at SerNet.DE
Sun Mar 6 18:48:49 UTC 2016
On Sun, Mar 06, 2016 at 04:57:01PM +0100, Ralph Boehme wrote:
> On Fri, Mar 04, 2016 at 01:18:47PM +0100, Volker Lendecke wrote:
> > On Fri, Mar 04, 2016 at 08:15:51AM +0100, Volker Lendecke wrote:
> > > On Thu, Mar 03, 2016 at 07:08:18PM +0100, Michael Adam wrote:
> > > > Unfortunately, this fails make test due to a slight
> > > > change in semantics of delete:
> > >
> > > Attached find a patchset that survived a private autobuild for me.
> > >
> > > Comments welcome!
> > Not a good day for me today. Working on the next version of this
> > patchset.
> maybe we should get rid of the double (or tripple with memcache) cache
> layering and use lmdb for the gencache.
There's a reason for the double-caching: The stuff that's in
gencache.tdb survives crashes even under writes. The
saf_join cache might be among the more important ones, but I
could imagine that other entries might also be valuable.
With the current 2-db architecture we can write and get
"eventual consistency" across crashes. I'm not sure lmdb
without sync keeps the stuff that was last sync'ed always
consistent, even under subsequent write traffic.
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