Re: RGW blocking on large objects

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On Wed, Oct 16, 2019 at 11:23 PM Robert LeBlanc <robert@xxxxxxxxxxxxx> wrote:
>
> On Tue, Oct 15, 2019 at 8:05 AM Robert LeBlanc <robert@xxxxxxxxxxxxx> wrote:
> >
> > On Mon, Oct 14, 2019 at 2:58 PM Paul Emmerich <paul.emmerich@xxxxxxxx> wrote:
> > >
> > > Could the 4 GB GET limit saturate the connection from rgw to Ceph?
> > > Simple to test: just rate-limit the health check GET
> >
> > I don't think so, we have dual 25Gbp in a LAG, so Ceph to RGW has
> > multiple paths, but we aren't balancing on port yet, so RGW to HAProxy
> > is probably limited to one link.
> >
> > > Did you increase "objecter inflight ops" and "objecter inflight op bytes"?
> > > You absolutely should adjust these settings for large RGW setups,
> > > defaults of 1024 and 100 MB are way too low for many RGW setups, we
> > > default to 8192 and 800MB
>
> On Nautilus the defaults already seem to be:
> objecter_inflight_op_bytes                                 104857600
>                       default
= 100MiB

> objecter_inflight_ops                                      24576
>                       default

not sure where you got this from, but the default is still 1024 even
in master: https://github.com/ceph/ceph/blob/4774808cb2923f65f6919fe8be5f98917075cdd7/src/common/options.cc#L2288



Paul

>
> > > Sometimes "ms async op threads" and "ms async max op threads" might
> > > help as well (we adjust them by default, but for other reasons)
> >
> > Thanks, I'll look into these options and see if they help.
>
> Is it possible that I may be running into something like this?
>
> https://github.com/boostorg/beast/issues/1077
>
> ----------------
> Robert LeBlanc
> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904  C70E E654 3BB2 FA62 B9F1
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