On Mon, 21 Dec 2015, Zhi Zhang wrote:
> Regards,
> Zhi Zhang (David)
> Contact: zhang.david2...@gmail.com
> zhangz.da...@outlook.com
>
>
>
> -- Forwarded message --
> From: Jaze Lee
> Date: Mon, Dec 21, 2015 at 4:08 PM
> Subject: Re: Client still connect failed leader after that mon down
> To: Zhi Zhang
>
>
> Hello,
> I am terrible sorry.
> I think we may not need to reconstruct the monclient.{h,cc}, we find
> the parameter is mon_client_hunt_interval is very usefull.
> When we set mon_client_hunt_interval = 0.5? the time to run a ceph
> command is very small even it first connects the down leader mon.
>
> The first time i ask the question was because we find the parameter
> from official site
> http://docs.ceph.com/docs/master/rados/configuration/mon-config-ref/.
> It is write in this
>
> mon client hung interval
Yep, that's a typo. Do you mind submitting a patch to fix it?
Thanks!
sage
>
> Description:The client will try a new monitor every N seconds until it
> establishes a connection.
> Type:Double
> Default:3.0
>
> And we set it. it is not work.
>
> I think may be it is a slip of pen?
> The right configuration parameter should be mon client hunt interval
>
> Can someone please help me to fix this in official site?
>
> Thanks a lot.
>
>
>
> 2015-12-21 14:00 GMT+08:00 Jaze Lee :
> > right now we use simple msg, and cpeh version is 0.80...
> >
> > 2015-12-21 10:55 GMT+08:00 Zhi Zhang :
> >> Which msg type and ceph version are you using?
> >>
> >> Once we used 0.94.1 with async msg, we encountered similar issue.
> >> Client was trying to connect a down monitor when it was just started
> >> and this connection would hung there. This is because previous async
> >> msg used blocking connection mode.
> >>
> >> After we back ported non-blocking mode of async msg from higher ceph
> >> version, we haven't encountered such issue yet.
> >>
> >>
> >> Regards,
> >> Zhi Zhang (David)
> >> Contact: zhang.david2...@gmail.com
> >> zhangz.da...@outlook.com
> >>
> >>
> >> On Fri, Dec 18, 2015 at 11:41 AM, Jevon Qiao wrote:
> >>> On 17/12/15 21:27, Sage Weil wrote:
>
> On Thu, 17 Dec 2015, Jaze Lee wrote:
> >
> > Hello cephers:
> > In our test, there are three monitors. We find client run ceph
> > command will slow when the leader mon is down. Even after long time, a
> > client run ceph command will also slow in first time.
> > >From strace, we find that the client first to connect the leader, then
> > after 3s, it connect the second.
> > After some search we find that the quorum is not change, the leader is
> > still the down monitor.
> > Is that normal? Or is there something i miss?
>
> It's normal. Even when the quorum does change, the client doesn't
> know that. It should be contacting a random mon on startup, though, so I
> would expect the 3s delay 1/3 of the time.
> >>>
> >>> That's because client randomly picks up a mon from Monmap. But what we
> >>> observed is that when a mon is down no change is made to monmap(neither
> >>> the
> >>> epoch nor the members). Is it the culprit for this phenomenon?
> >>>
> >>> Thanks,
> >>> Jevon
> >>>
> A long-standing low-priority feature request is to have the client
> contact
> 2 mons in parallel so that it can still connect quickly if one is down.
> It's requires some non-trivial work in mon/MonClient.{cc,h} though and I
> don't think anyone has looked at it seriously.
>
> sage
>
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