bind 9.4.3b2 probs - "recursive-clients soft limit exceeded"

[JINMEI Tatuya / 神明達哉]

At Thu, 17 Jul 2008 12:54:45 -0500,
Patrick Larkin Jr <plarkin at corp.earthlink.net> wrote:

> I have a couple dozen recursive resolvers around the country.
> A mix of Sun v210's on Sol8 and T2000's on Sol10.  All were
> running bind 9.4.2, but we built and installed 9.4.3b2 on
> two of each platforms (4 machines).  One of the T2000's
> quickly became unresponsive with many of these errors:
>    recursive-clients soft limit exceeded, aborting oldest query
> That machine (of the four) traditionally takes more traffic
> than the other three.  All the other machines running 9.4.3b2
> (and those on 9.4.2) run fine.
> 
> We built 9.4.2-P1 and installed it on the misbehaving T2000
> and it seems to run OK, but we get a few of these at times:
>      socket: too many open file descriptors
> 
> root at rns-catcall[233]# grep recurs named.conf*
> named.conf:     recursion yes;
> named.conf:     recursive-clients 50000;
> root at rns-catcall[234]#
> 
> The one machine with problems on 9.4.3b2 had status values like this:
> 	recursive clients: 49800/49900/50000
> and now, on 9.4.2-P1 its:
> 	recursive clients: 410/49900/50000

Having 49800 recursive clients seems very extraordinary.  Is that a
normal condition of your server, even when you used 9.4.2?

---
JINMEI, Tatuya
Internet Systems Consortium, Inc.