On 05/12/2011 02:23 PM, Stephen Gallagher wrote: > On Thu, 2011-05-12 at 13:07 +0200, Jakub Hrozek wrote: >> https://fedorahosted.org/sssd/ticket/867 >> >> channel->tries is only used when a query fails. We were forcibly setting >> it to 0, which meant we never retried another server. > > From the c-ares manual: > > ARES_OPT_TRIES int tries; > The number of tries the resolver will try contacting each name server > before giving up. The default is four tries. > > > We originally set it to zero because the above entry used to read "the > number of retries", not tries.So zero retries was supposed to mean one > try per server. > > Can you verify in the c-ares code that this isn't a behavior that > CHANGED between versions (and thus we might need to detect the version > in use and handle it?) >
The code in question in c-ares is called only when a search fails and
reads (simplified):
-------
while (++try < (nservers * tries)) {
/* Get next server */
/* Send the query again */
}
/* Mark query as failed */
-------
Since we had tries=0, we skipped the failover part and immediately
marked the query as failed.
The code is the same in c-ares 1.6 (RHEL5) and 1.7 (RHEL6 and supported
Fedora versions).
Jakub
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