stylesheet_cache 目标泄露？

开发
1

继续讨论 PostgreSQL 13 更新：

嗯，这个数字感觉有点高。Meta 表有 33k 行。让我们看看这个查询：

select count(*), target, max(updated_at) from stylesheet_cache
group by target
order by target, max(updated_at)

看起来我们对每个目标（target）设置了 50 个缓存样式表的上限，但不知为何，我们正在泄露 target 限定符？

count target updated_at
50 discourse-adplugin_37 2021-04-23T19:08:43.292Z
50 discourse-adplugin_43 2021-04-23T19:08:52.227Z
50 discourse-adplugin_54 2021-04-23T19:09:01.121Z
50 discourse-adplugin_55 2021-04-23T19:09:10.245Z
50 discourse-adplugin_57 2021-04-23T19:08:25.265Z
6 discourse-adplugin_64 2021-01-01T11:49:49.071Z
50 discourse-adplugin_65 2020-09-21T16:23:50.647Z
50 discourse-adplugin_66 2021-04-23T19:08:34.562Z
1 discourse-adplugin_71 2020-01-15T21:07:26.560Z
50 discourse-adplugin_72 2020-04-01T23:52:51.691Z
10 discourse-adplugin_75 2020-08-18T20:17:16.954Z
50 discourse-adplugin_77 2020-09-21T18:22:22.334Z
50 discourse-adplugin_9 2021-04-23T19:09:19.228Z

此外，这一行显然是不正确的，但实际上无关紧要（我们只是比必要的时间更早开始执行删除操作）：

-count = StylesheetCache.count
+count = StylesheetCache.where(target: target).count
 if count > MAX_TO_KEEP
   ... code that deletes old entries, sharded on target ...
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