Hi,
I am trying to understand under which circumstances in Varnish 2.0.3 HSH_Lookup
could get entered entered multiply in succession in a restart-scenatio. The
effect I am seeing is duplication of session objects on the waitinglist.
I was also considering duplication of output lines, but if I add a high
resolution time stamp in HSH_Lookup's handling of busy objects,
if (busy_o != NULL) {
/* There are one or more busy objects, wait for them */
if (sp->esis == 0)
VTAILQ_INSERT_TAIL(&oh->waitinglist, sp, list);
if (params->diag_bitmap & 0x20)
WSP(sp, SLT_Debug,
"%lld %p on waiting list %p <%s>", gethrtime(), sp, oh,
oh->hash);
sp->objhead = oh;
Lck_Unlock(&oh->mtx);
return (NULL);
}
what I get is this (URL removed to protect the innocent):
48 VCL_call c recv lookup
48 VCL_call c hash hash
48 Debug c 24115201202978841 8d6278 on waiting list 8b72e0 <##URL##>
48 VCL_call c hash hash
48 Debug c 24115203101868689 8d6278 on waiting list 8b72e0 <##URL##>
48 VCL_call c hash hash
48 Debug c 24115203106349919 8d6278 on waiting list 8b72e0 <##URL##>
48 VCL_call c hash hash
48 Debug c 24115205121308416 8d6278 on waiting list 8b72e0 <##URL##>
48 VCL_call c hash hash
48 Debug c 24115205122330112 8d6278 on waiting list 8b72e0 <##URL##>
48 VCL_call c hash hash
48 Debug c 24115207141435616 8d6278 on waiting list 8b72e0 <##URL##>
48 VCL_call c hash hash
48 Hit c 1506286692
the restart VCL code basically is this:
sub vcl_recv {
if (req.restarts == 0) {
# set default backend and default grace
} else if (req.restarts == 1) {
set req.grace = 24h;
# set other backend
} else {
error 503 "Retry count exceeded";
}
}
Basically, what I am trying to achieve is to have restarts fall back to the
cache.
I'd appreciate any pointers, at this point I really don't understand why the
hash vcl should get invoked multiple times.
Thank you, Nils
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