BBlack has uploaded a new change for review.
https://gerrit.wikimedia.org/r/320310
Change subject: VCL: retry explicit 503 once as well
......................................................................
VCL: retry explicit 503 once as well
In Varnish 3 these cases were blended together, but in Varnish 4
they're distinct: you can only catch->retry explicit 503s in
vcl_backend_response, and you can only catch->retry implicit 503s
in vcl_backend_error. Since both are protected with
bereq.retries==0, they can't both be applied to the same backend
fetch attempt.
Change-Id: Ib91a48f13c49ea4322a86e844e1640c3d6f22422
---
M modules/varnish/templates/vcl/wikimedia-frontend.vcl.erb
1 file changed, 6 insertions(+), 0 deletions(-)
git pull ssh://gerrit.wikimedia.org:29418/operations/puppet
refs/changes/10/320310/1
diff --git a/modules/varnish/templates/vcl/wikimedia-frontend.vcl.erb
b/modules/varnish/templates/vcl/wikimedia-frontend.vcl.erb
index 7d607f9..969505b 100644
--- a/modules/varnish/templates/vcl/wikimedia-frontend.vcl.erb
+++ b/modules/varnish/templates/vcl/wikimedia-frontend.vcl.erb
@@ -342,6 +342,11 @@
<% if @varnish_version4 -%>
sub vcl_backend_response {
+ // retry 503 once in frontend instances, to paper over transient issues
+ // This catches the backending handing us an explicit 503
+ if (beresp.status == 503 && bereq.retries == 0) {
+ return(retry);
+ }
<% else -%>
sub vcl_fetch {
<% end -%>
@@ -435,6 +440,7 @@
sub vcl_backend_error {
// retry 503 once in frontend instances, to paper over transient issues
+ // This catches an implicit 503 (e.g. connectfail, timeout, etc)
if (beresp.status == 503 && bereq.retries == 0) {
return(retry);
}
--
To view, visit https://gerrit.wikimedia.org/r/320310
To unsubscribe, visit https://gerrit.wikimedia.org/r/settings
Gerrit-MessageType: newchange
Gerrit-Change-Id: Ib91a48f13c49ea4322a86e844e1640c3d6f22422
Gerrit-PatchSet: 1
Gerrit-Project: operations/puppet
Gerrit-Branch: production
Gerrit-Owner: BBlack <bbl...@wikimedia.org>
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