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我正在尝试在我的 Policy 控制器上实现动作缓存，但是，当呈现的片段大小增加时，它不会重新使用缓存的片段。

当我的操作“索引”仅显示10 个 JSON 对象时，它会正确创建和读取该操作的片段。证明：

Started GET "/policies" for 127.0.0.1 at 2013-03-10 01:03:38 -0500
Processing by PolicyController#index as JSON
Read fragment views/railsdev.com:3000/policies.json (0.3ms)
  VideoPolicy Load (0.4ms)  SELECT `video_policies`.* FROM `video_policies` 
Write fragment views/railsdev.com:3000/policies.json (0.5ms)
Completed 200 OK in 27ms (Views: 0.2ms | ActiveRecord: 0.4ms)


Started GET "/policies" for 127.0.0.1 at 2013-03-10 01:03:56 -0500
Processing by PolicyController#index as JSON
Read fragment views/railsdev.com:3000/policies.json (0.4ms)
Completed 200 OK in 1ms (ActiveRecord: 0.0ms)
[2013-03-10 01:03:56] WARN  Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true

但是，当我将数量增加到10,000 个 JSON 对象时，它开始查询数据库并使用每个请求重新写入片段。证明：

Started GET "/policies" for 127.0.0.1 at 2013-03-10 01:12:45 -0500
Processing by PolicyController#index as JSON
Read fragment views/railsdev.com:3000/policies.json (0.3ms)
  VideoPolicy Load (6.8ms)  SELECT `video_policies`.* FROM `video_policies` 
Write fragment views/railsdev.com:3000/policies.json (3.8ms)
Completed 200 OK in 3482ms (Views: 0.2ms | ActiveRecord: 7.5ms)


Started GET "/policies" for 127.0.0.1 at 2013-03-10 01:12:52 -0500
Processing by PolicyController#index as JSON
Read fragment views/railsdev.com:3000/policies.json (0.2ms)
  VideoPolicy Load (1.7ms)  SELECT `video_policies`.* FROM `video_policies` 
Write fragment views/railsdev.com:3000/policies.json (115.0ms)
Completed 200 OK in 3713ms (Views: 0.2ms | ActiveRecord: 1.7ms)
[2013-03-10 01:12:55] WARN  Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true

我注意到当文件大小超过 1MB 标记时会发生这种情况（顺便说一句，这是 memcached 对象的最大大小。我也在使用 memcached。）是否存在某种最大片段大小或其他原因它没有缓存这些吗？

这也是我的控制器：

class PolicyController < ApplicationController
  caches_action :index, :cache_path => Proc.new {|controller| controller.params }

  def index
    policies = VideoPolicy.all
    respond_to do |format|
      format.html
      format.json{
        render :json => policies.to_json
      }
    end
  end
end
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1 回答 1

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我猜这是造成这种情况的 memcached 的默认页板大小。

这个讨论讨论了这个问题和一些步骤。

Memcahced 手册页说-I <size>可用于覆盖默认的 1 mb。您可以尝试将其设置为 2mb 并查看您的应用程序的行为是否发生变化？

于 2013-03-10T06:58:20.767 回答