将Rails 4.2.9应用程序升级到Rails 5.2.1.1。之后，可以获得一些Rack::Timeout::RequestTimeoutException: Request waited {7ms}, then ran for longer than 15000ms。
这是由机架超时宝石documented here引起的。
也就是说，我无法确定超时的根本原因。我可以成功加载机器触发的URL，但显然其他用户遇到了问题。
在解决此问题方面的任何帮助将不胜感激。
谢谢！
回溯（来自Airbrake –包括“代码块”）：
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/postgresql_adapter.rb:603 in async_exec
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/postgresql_adapter.rb:603 in block (2 levels) in exec_no_cache
/gems/activesupport-5.2.1.1/lib/active_support/dependencies/interlock.rb:48 in block in permit_concurrent_loads
/gems/activesupport-5.2.1.1/lib/active_support/concurrency/share_lock.rb:187 in yield_shares
/gems/activesupport-5.2.1.1/lib/active_support/dependencies/interlock.rb:47 in permit_concurrent_loads
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/postgresql_adapter.rb:602 in block in exec_no_cache
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract_adapter.rb:579 in block (2 levels) in log
vendor/ruby-2.4.4/lib/ruby/2.4.0/monitor.rb:214 in mon_synchronize
212:
mon_enter
213:
begin
214:
yield
215:
ensure
216:
mon_exit
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract_adapter.rb:578 in block in log
/gems/activesupport-5.2.1.1/lib/active_support/notifications/instrumenter.rb:23 in instrument
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract_adapter.rb:569 in log
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/postgresql_adapter.rb:601 in exec_no_cache
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/postgresql_adapter.rb:590 in execute_and_clear
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:81 in exec_query
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract/database_statements.rb:465 in select
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract/database_statements.rb:57 in select_all
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract/query_cache.rb:99 in block in select_all
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract/query_cache.rb:122 in block in cache_sql
vendor/ruby-2.4.4/lib/ruby/2.4.0/monitor.rb:214 in mon_synchronize
212:
mon_enter
213:
begin
214:
yield
215:
ensure
216:
mon_exit
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract/query_cache.rb:108 in cache_sql
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract/query_cache.rb:99 in select_all
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract/database_statements.rb:81 in select_rows
/gems/activerecord-5.2.1.1/lib/active_record/connection_adapters/abstract/database_statements.rb:69 in select_value
/gems/activerecord-5.2.1.1/lib/active_record/relation/finder_methods.rb:322 in block in exists?
/gems/activerecord-5.2.1.1/lib/active_record/relation.rb:578 in skip_query_cache_if_necessary
/gems/activerecord-5.2.1.1/lib/active_record/relation/finder_methods.rb:322 in exists?
/gems/unread-0.10.1/lib/unread/readable.rb:124 in unread?
app/views/stories/_story.html.slim:4 in _app_views_stories__story_html_slim___4341629232572424476_47283389142580
2:
- if story.time_capsule?
3:
.flag = t("stories.time_capsule.label")
4:
- elsif story.unread?(current_user)
5:
.flag = t("stories.unread")
6:
= link_to story_path(story), class: "open-block" do
/gems/actionview-5.2.1.1/lib/action_view/template.rb:159 in block in render
/gems/activesupport-5.2.1.1/lib/active_support/notifications.rb:168 in block in instrument
/gems/activesupport-5.2.1.1/lib/active_support/notifications/instrumenter.rb:23 in instrument
/gems/activesupport-5.2.1.1/lib/active_support/notifications.rb:168 in instrument
/gems/actionview-5.2.1.1/lib/action_view/template.rb:354 in instrument_render_template
/gems/actionview-5.2.1.1/lib/action_view/template.rb:157 in render
/gems/actionview-5.2.1.1/lib/action_view/renderer/partial_renderer.rb:344 in block in render_partial
/gems/actionview-5.2.1.1/lib/action_view/renderer/abstract_renderer.rb:44 in block in instrument
/gems/activesupport-5.2.1.1/lib/active_support/notifications.rb:168 in block in instrument
/gems/activesupport-5.2.1.1/lib/active_support/notifications/instrumenter.rb:23 in instrument
/gems/activesupport-5.2.1.1/lib/active_support/notifications.rb:168 in instrument
/gems/actionview-5.2.1.1/lib/action_view/renderer/abstract_renderer.rb:43 in instrument
/gems/actionview-5.2.1.1/lib/action_view/renderer/partial_renderer.rb:333 in render_partial
/gems/actionview-5.2.1.1/lib/action_view/renderer/partial_renderer.rb:312 in render
/gems/actionview-5.2.1.1/lib/action_view/renderer/renderer.rb:49 in render_partial
/gems/actionview-5.2.1.1/lib/action_view/helpers/rendering_helper.rb:36 in render
app/views/stories/index.html.slim:19 in block in _app_views_stories_index_html_slim___2178368229094429886_47283376767280
17:
ul.stories.blocks
18:
- @stories.each do |story|
19:
= render "stories/story", story: story
20:
= render 'comments/compact_list'
21:
- else
app/views/stories/index.html.slim:18 in each
16:
- if @stories.to_a.any?
17:
ul.stories.blocks
18:
- @stories.each do |story|
19:
= render "stories/story", story: story
20:
= render 'comments/compact_list'
app/views/stories/index.html.slim:18 in _app_views_stories_index_html_slim___2178368229094429886_47283376767280
16:
- if @stories.to_a.any?
17:
ul.stories.blocks
18:
- @stories.each do |story|
19:
= render "stories/story", story: story
20:
= render 'comments/compact_list'
/gems/actionview-5.2.1.1/lib/action_view/template.rb:159 in block in render
/gems/activesupport-5.2.1.1/lib/active_support/notifications.rb:168 in block in instrument
/gems/activesupport-5.2.1.1/lib/active_support/notifications/instrumenter.rb:23 in instrument
/gems/activesupport-5.2.1.1/lib/active_support/notifications.rb:168 in instrument
/gems/actionview-5.2.1.1/lib/action_view/template.rb:354 in instrument_render_template
/gems/actionview-5.2.1.1/lib/action_view/template.rb:157 in render
/gems/actionview-5.2.1.1/lib/action_view/renderer/template_renderer.rb:54 in block (2 levels) in render_template
/gems/actionview-5.2.1.1/lib/action_view/renderer/abstract_renderer.rb:44 in block in instrument
/gems/activesupport-5.2.1.1/lib/active_support/notifications.rb:168 in block in instrument
/gems/activesupport-5.2.1.1/lib/active_support/notifications/instrumenter.rb:23 in instrument
/gems/activesupport-5.2.1.1/lib/active_support/notifications.rb:168 in instrument
/gems/actionview-5.2.1.1/lib/action_view/renderer/abstract_renderer.rb:43 in instrument
/gems/actionview-5.2.1.1/lib/action_view/renderer/template_renderer.rb:53 in block in render_template
/gems/actionview-5.2.1.1/lib/action_view/renderer/template_renderer.rb:61 in render_with_layout
/gems/actionview-5.2.1.1/lib/action_view/renderer/template_renderer.rb:52 in render_template
/gems/actionview-5.2.1.1/lib/action_view/renderer/template_renderer.rb:16 in render
/gems/actionview-5.2.1.1/lib/action_view/renderer/renderer.rb:44 in render_template
/gems/actionview-5.2.1.1/lib/action_view/renderer/renderer.rb:25 in render
/gems/actionview-5.2.1.1/lib/action_view/rendering.rb:103 in _render_template
/gems/actionpack-5.2.1.1/lib/action_controller/metal/streaming.rb:219 in _render_template
/gems/actionview-5.2.1.1/lib/action_view/rendering.rb:84 in render_to_body
/gems/actionpack-5.2.1.1/lib/action_controller/metal/rendering.rb:52 in render_to_body
/gems/actionpack-5.2.1.1/lib/action_controller/metal/renderers.rb:142 in render_to_body
/gems/actionpack-5.2.1.1/lib/abstract_controller/rendering.rb:25 in render
/gems/actionpack-5.2.1.1/lib/action_controller/metal/rendering.rb:36 in render
/gems/actionpack-5.2.1.1/lib/action_controller/metal/instrumentation.rb:46 in block (2 levels) in render
/gems/activesupport-5.2.1.1/lib/active_support/core_ext/benchmark.rb:14 in block in ms
vendor/ruby-2.4.4/lib/ruby/2.4.0/benchmark.rb:308 in realtime
306:
def realtime # :yield:
307:
r0 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
308:
yield
309:
Process.clock_gettime(Process::CLOCK_MONOTONIC) - r0
310:
end
/gems/activesupport-5.2.1.1/lib/active_support/core_ext/benchmark.rb:14 in ms
/gems/actionpack-5.2.1.1/lib/action_controller/metal/instrumentation.rb:46 in block in render
答案 0 :(得分：1)
我有一个非常相似的问题。我的情况是30多岁。有人告诉我，这对Heroku来说是一个硬性限制。
但是现在看到您有15秒的超时时间，还有其他事情。也许他们在最近9个月内增加了？ （不太可能）
或取决于计划。
也许与Heroku无关，而它是rack-timeout的宝石。
根据他们的自述文件。
您可以将RACK_TIMEOUT_SERVICE_TIMEOUT环境变量更新为更大的值
或在不需要生产错误来报告缓慢的端点时删除宝石...叹气
我确实已经将var设置为30s
我将其提高到60s，几天后我会告诉您是否可以解决
https://github.com/sharpstone/rack-timeout#rails-apps
更新：该gem确实会提前终止请求，但是heroku限制也存在。如果禁用该gem，您将在日志或指标屏幕中看到heroku返回的H12。
有关硬限制的更多信息，请参见本文
答案 1 :(得分：0)
大家好，我解决了这个问题，删除了 gem 'rack-timeout' 并运行了 rails server。
答案 2 :(得分：0)
如果有帮助，我通过在终端中运行以下命令解决了这个问题：
export RACK_TIMEOUT_SERVICE_TIMEOUT=30