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

[Patrick Larkin Jr]

on 7/17/2008 1:24 PM JINMEI Tatuya / 神明達哉 said the following:
> 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?

Not at all a normal condition.... and drops to reasonable
levels when we downrev'd that machine to 9.4.2-P1.
All other machines (9.4.2 and 9.4.3b2) have values below 1000


-- 
  Patrick Larkin Jr - Dallas Texas USA
    Earthlink Core Services Engineering
       PLarkin at corp.EarthLink.NET