Re: [PATCH] do_reconnect: expiry check of dclist BEFORE lookup using it

Hi autofs developers,

it's been quiet a while since I submitted this patch but I never got any 
feedback if it was accepted or rejected. Is there something wrong with 
my submission or didn't you have time yet to review it.

On 2025-10-02 12:52:49, Patrick Cernko wrote:
> Hi autofs developers,
> 
> this patch changes the behavior when to refresh LDAP SRV records. The 
> documentation states:
> 
>> The server list returned from an SRV RR lookup is refreshed according 
>> to the minimum ttl found in the SRV RR records or after one hour, 
>> whichever is less.
> 
> But the code in fact does not do any refreshing as long as at least one 
> server in the dclist still responds.
> 
> This issue became obvious in our setup, when we had to disable the first 
> two servers: autofs continued to contact ldap-a and ldap-b, running in 
> timeouts (~5sec) and finally got an answer from ldap-c. But due to the 
> timeouts every mount took >10sec resulting in slow responsiveness for 
> the whole system. Changing the SRV records (with TTLs of 7200) did not 
> help. As a workaround we had to signal all client's automount processes 
> with HUP.
> 
> The change invalidates the dclist if expired. This forces autofs to do a 
> new SRV record lookup before doing the LDAP lookup.
> 
> Best regards,

Best regards,
-- 
Patrick Cernko <[email protected]> +49 681 9325 5815
Joint Scientific IT and Technical Service
Max-Planck-Institute für Informatik & Software Systems