BBlack has uploaded a new change for review.
https://gerrit.wikimedia.org/r/270957
Change subject: ttl_fixed: limit to tier-1 backends
......................................................................
ttl_fixed: limit to tier-1 backends
Even before the creation of "ttl_fixed", all cache_upload backends were
hisorically fixing TTLs at 30 days regardless of tier. This is incorrect,
as for example a fixed-30-day object in a tier-1 backend could be served to
a tier-2 backend with only 3 days left, at which point it would be re-upped
to a full 30 days again, causing a total maximum object life of up to ~60
days.
This patch renames ttl_fixed to ttl_fixed_1be, so that the name reflect the
new constraint that the parameter is ignored except in tier1 backend VCLs.
Change-Id: I1e65daec5017192558fc1869d5056a7f5e76773e
---
M modules/role/manifests/cache/upload.pp
M modules/varnish/templates/vcl/wikimedia.vcl.erb
2 files changed, 7 insertions(+), 3 deletions(-)
git pull ssh://gerrit.wikimedia.org:29418/operations/puppet
refs/changes/57/270957/1
diff --git a/modules/role/manifests/cache/upload.pp
b/modules/role/manifests/cache/upload.pp
index 226ff24..7e0a9bd 100644
--- a/modules/role/manifests/cache/upload.pp
+++ b/modules/role/manifests/cache/upload.pp
@@ -83,7 +83,7 @@
$be_vcl_config = merge($common_vcl_config, {
'layer' => 'backend',
- 'ttl_fixed' => '30d',
+ 'ttl_fixed_1be' => '30d',
'ttl_cap' => '30d',
})
diff --git a/modules/varnish/templates/vcl/wikimedia.vcl.erb
b/modules/varnish/templates/vcl/wikimedia.vcl.erb
index 62e4e51..65e4fa9 100644
--- a/modules/varnish/templates/vcl/wikimedia.vcl.erb
+++ b/modules/varnish/templates/vcl/wikimedia.vcl.erb
@@ -474,13 +474,17 @@
}
sub vcl_fetch {
-<% if @vcl_config.fetch("ttl_fixed", false) -%>
+<% if @site_tier == "one" && @vcl_config.fetch("layer", "") == "backend" -%>
+<% if @vcl_config.fetch("ttl_fixed_1be", false) -%>
// Fixed TTL (rare/questionable, only used on upload backend right now)
+ // Only valid in tier-1 backend; it would be incorrect to re-raise the
+ // TTL on cache->cache fetches...
// Note the ttl_cap comes after this and takes precedence!
if (beresp.status <= 400) {
- set beresp.ttl = <%= @vcl_config.fetch("ttl_fixed", "invalid")
%>;
+ set beresp.ttl = <%= @vcl_config.fetch("ttl_fixed_1be",
"invalid") %>;
}
<% end -%>
+<% end -%>
// Hard TTL cap on all fetched objects (default 21d)
if (beresp.ttl > <%= @vcl_config.fetch("ttl_cap", "21d") %>) {
--
To view, visit https://gerrit.wikimedia.org/r/270957
To unsubscribe, visit https://gerrit.wikimedia.org/r/settings
Gerrit-MessageType: newchange
Gerrit-Change-Id: I1e65daec5017192558fc1869d5056a7f5e76773e
Gerrit-PatchSet: 1
Gerrit-Project: operations/puppet
Gerrit-Branch: production
Gerrit-Owner: BBlack <[email protected]>
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