Re: CephFS mount delay

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On Thu, 30 Aug 2012, Noah Watkins wrote:
> On Thu, Aug 30, 2012 at 3:17 PM, Gregory Farnum <greg@xxxxxxxxxxx> wrote:
> > On Thu, Aug 30, 2012 at 3:10 PM, Noah Watkins <jayhawk@xxxxxxxxxxx> wrote:
> >> Ok, this patch sorta solves the problem. After a fresh restart of the
> >> daemons, the client hangs indefinitely (log urls attached for this
> >> case). If I kill the client and restart, I get a behavior similar to
> >> the original problem. Another client restart and everything is very
> >> fast. This easily reproducible.
> >
> > I'm not quite sure what scenario you're describing here ? let's see if
> > I understand correctly:
> > 1) Working cluster.
> > 2) Restart server daemons.
> > 3) Client just hangs. :(
> > 4) Restart client and it goes slow through the mount (once?).
> > 5) Restart client again and everything goes fast from then on.
> 
> Yeh, remove (4) -- there was some other fluke, I think. The following
> happens every time with the one line patch from Sage:
> 
> 2) Restart daemons
> 3) Client hangs in mount
> 4) Restart client and everything runs very fast from now on.
> 
> Without the patch, the client never hangs, but is consistently slow to mount.

I think this is just the mds reconnect delay; it's complete normal when 
the mds restarts and some of the clients also crashed that it has to wait 
for the full reconnect window to pass.

I pushed the fix to master!

sage

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