我目前在我的网络应用程序中遇到了一些尴尬的超时，他们都指向我的mongo数据库（我正在使用MongoHQ）。这些超时发生在非常安静的时间（即每分钟1次请求），并且会发生几分钟然后停止。
所以，我正在努力实施一些mongo监控。有没有人有什么建议？我正在考虑编写一个只测试以下内容的计时器？
unless Mongo::Connection.from_uri(uri).ping['ok']
# alert me of db being down
end
我的配置设置如下：
@pool_size=1, @pool_timeout=5.0, @op_timeout=nil, @connect_timeout=nil,
有更好的方法吗？还是一个更好的解决方案？
我正在运行ruby驱动程序（mongo-1.6.2，因为我使用的是mongoid-2）。
我看到的例外是：
vendor/ruby-1.9.3/lib/ruby/1.9.1/thread.rb:71:in `sleep'
vendor/ruby-1.9.3/lib/ruby/1.9.1/thread.rb:71:in `wait'
vendor/bundle/ruby/1.9.1/gems/mongo-1.6.2/lib/mongo/util/pool.rb:298:in `block (2 levels) in checkout'
<internal:prelude>:10:in `synchronize'
vendor/bundle/ruby/1.9.1/gems/mongo-1.6.2/lib/mongo/util/pool.rb:252:in `block in checkout'
vendor/bundle/ruby/1.9.1/gems/mongo-1.6.2/lib/mongo/util/pool.rb:245:in `loop'
vendor/bundle/ruby/1.9.1/gems/mongo-1.6.2/lib/mongo/util/pool.rb:245:in `checkout'
vendor/bundle/ruby/1.9.1/gems/mongo-1.6.2/lib/mongo/connection.rb:500:in `checkout_writer'
vendor/bundle/ruby/1.9.1/gems/mongo-1.6.2/lib/mongo/cursor.rb:524:in `checkout_socket_from_connection'
vendor/bundle/ruby/1.9.1/gems/mongo-1.6.2/lib/mongo/cursor.rb:466:in `send_initial_query'
vendor/bundle/ruby/1.9.1/gems/mongo-1.6.2/lib/mongo/cursor.rb:458:in `refresh'
vendor/bundle/ruby/1.9.1/gems/mongo-1.6.2/lib/mongo/cursor.rb:128:in `next'
vendor/bundle/ruby/1.9.1/gems/mongo-1.6.2/lib/mongo/collection.rb:288:in `find_one'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid/collections/master.rb:25:in `block in find_one'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid/collections/retry.rb:29:in `retry_on_connection_failure'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid/collections/master.rb:24:in `find_one'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid/collection.rb:60:in `find_one'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid/contexts/mongo.rb:205:in `first'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid/criteria.rb:45:in `first'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid/criterion/inclusion.rb:169:in `from_map_or_db'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid/criterion/inclusion.rb:149:in `execute_or_raise'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid/criterion/inclusion.rb:129:in `find'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid/finders.rb:84:in `find'
app/controllers/application_controller.rb:266:in `find_question'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:462:in `_run__469780332759358222__process_action__3401617144824505767__callbacks'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:405:in `__run_callback'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:81:in `run_callbacks'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/abstract_controller/callbacks.rb:17:in `process_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_controller/metal/rescue.rb:29:in `process_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/notifications.rb:123:in `block in instrument'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/notifications.rb:123:in `instrument'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_controller/metal/instrumentation.rb:29:in `process_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.5.5.38/lib/new_relic/agent/instrumentation/rails3/action_controller.rb:34:in `block in process_action'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.5.5.38/lib/new_relic/agent/instrumentation/controller_instrumentation.rb:268:in `block in perform_action_with_newrelic_trace'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.5.5.38/lib/new_relic/agent/method_tracer.rb:240:in `trace_execution_scoped'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.5.5.38/lib/new_relic/agent/instrumentation/controller_instrumentation.rb:263:in `perform_action_with_newrelic_trace'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.5.5.38/lib/new_relic/agent/instrumentation/rails3/action_controller.rb:33:in `process_action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/abstract_controller/base.rb:121:in `process'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/abstract_controller/rendering.rb:45:in `process'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_controller/metal.rb:203:in `dispatch'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_controller/metal.rb:246:in `block in action'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/routing/route_set.rb:73:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/routing/route_set.rb:36:in `call'
vendor/bundle/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:68:in `block in call'
vendor/bundle/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:56:in `each'
vendor/bundle/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:56:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/routing/route_set.rb:601:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-pjax-0.6.0/lib/rack/pjax.rb:12:in `call'
vendor/bundle/ruby/1.9.1/gems/omniauth-1.1.1/lib/omniauth/strategy.rb:177:in `call!'
vendor/bundle/ruby/1.9.1/gems/omniauth-1.1.1/lib/omniauth/strategy.rb:157:in `call'
vendor/bundle/ruby/1.9.1/gems/omniauth-1.1.1/lib/omniauth/strategy.rb:177:in `call!'
vendor/bundle/ruby/1.9.1/gems/omniauth-1.1.1/lib/omniauth/strategy.rb:157:in `call'
vendor/bundle/ruby/1.9.1/gems/omniauth-1.1.1/lib/omniauth/builder.rb:48:in `call'
vendor/bundle/ruby/1.9.1/gems/oink-0.10.1/lib/oink/middleware.rb:17:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-timeout-0.0.3/lib/rack/timeout.rb:16:in `block in call'
vendor/bundle/ruby/1.9.1/gems/rack-timeout-0.0.3/lib/rack/timeout.rb:16:in `call'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.5.5.38/lib/new_relic/rack/error_collector.rb:8:in `call'
vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.5.5.38/lib/new_relic/rack/browser_monitoring.rb:12:in `call'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/rack/mongoid/middleware/identity_map.rb:33:in `block in call'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/mongoid.rb:133:in `unit_of_work'
vendor/bundle/ruby/1.9.1/gems/mongoid-2.4.12/lib/rack/mongoid/middleware/identity_map.rb:33:in `call'
vendor/bundle/ruby/1.9.1/gems/sass-3.2.6/lib/sass/plugin/rack.rb:54:in `call'
vendor/bundle/ruby/1.9.1/gems/exception_notification-2.6.1/lib/exception_notifier.rb:34:in `call'
vendor/bundle/ruby/1.9.1/gems/warden-1.2.1/lib/warden/manager.rb:35:in `block in call'
vendor/bundle/ruby/1.9.1/gems/warden-1.2.1/lib/warden/manager.rb:34:in `catch'
vendor/bundle/ruby/1.9.1/gems/warden-1.2.1/lib/warden/manager.rb:34:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.4/lib/rack/etag.rb:23:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.4/lib/rack/conditionalget.rb:25:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/head.rb:14:in `call'
vendor/bundle/ruby/1.9.1/gems/remotipart-1.0.2/lib/remotipart/middleware.rb:30:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/params_parser.rb:21:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/flash.rb:242:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.4/lib/rack/session/abstract/id.rb:210:in `context'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.4/lib/rack/session/abstract/id.rb:205:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/cookies.rb:341:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:405:in `_run__1746387501225523832__call__2262895368653440085__callbacks'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:405:in `__run_callback'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:81:in `run_callbacks'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/rack/logger.rb:32:in `call_app'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/rack/logger.rb:16:in `block in call'
vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/tagged_logging.rb:22:in `tagged'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/rack/logger.rb:16:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/request_id.rb:22:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.4/lib/rack/methodoverride.rb:21:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.4/lib/rack/runtime.rb:17:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.4/lib/rack/lock.rb:15:in `call'
vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.11/lib/action_dispatch/middleware/static.rb:62:in `call'
vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward'
vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch'
vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:185:in `lookup'
vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!'
vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/engine.rb:479:in `call'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/application.rb:223:in `call'
vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/railtie/configurable.rb:30:in `method_missing'
vendor/bundle/ruby/1.9.1/gems/rack-1.4.4/lib/rack/deflater.rb:13:in `call'
vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:531:in `process_client'
vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:606:in `worker_loop'
vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:487:in `spawn_missing_workers'
vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:137:in `start'
vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/bin/unicorn:121:in `<top (required)>'
vendor/bundle/ruby/1.9.1/bin/unicorn:23:in `load'
vendor/bundle/ruby/1.9.1/bin/unicorn:23:in `<main>'
答案 0 :(得分：2)
10gen提供名为MMS的Mongo监控服务，该服务包含在所有MongoHQ计划per their pricing page中。我将从那里开始，因为这样可以让您深入了解数据库正在做什么以及为什么它可能没有响应。
答案 1 :(得分：2)
如果您在几分钟的请求后失去活动期间获得超时，则可能的原因是您在尝试使用连接时发现的connection pool中存在过时的连接。过时的连接将导致应用程序出现超时错误，并且将重新建立数据库连接。当您的应用程序发出新请求时，过时的连接将被刷新，超时错误将消失。
您可以通过减少超时值来解决此问题，但您也可以通过在超时异常时重试查询来解决此问题。 MongoHQ支持可能会为您的服务设置适当的超时值。