我有生产服务器（Nginx + Passenger）。当我从另一台计算机尝试ab -n 3 -c 3 myhost.ru/时，我在我的nginx error.log中收到此错误日志：
[ pid=21160 thr=139775297914624 file=ext/nginx/HelperAgent.cpp:584 time=2011-08-31 15:25:49.22 ]: Uncaught exception in PassengerServer client thread:
exception: Cannot read response from backend process: Connection reset by peer (104)
backtrace:
in 'void Client::forwardResponse(Passenger::SessionPtr&, Passenger::FileDescriptor&, const Passenger::AnalyticsLogPtr&)' (HelperAgent.cpp:330)
in 'void Client::handleRequest(Passenger::FileDescriptor&)' (HelperAgent.cpp:510)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
[ pid=21249 thr=15884760 file=utils.rb:176 time=2011-08-31 15:25:49.022 ]: *** Exception PGError in application (server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
) (process 21249, thread #<Thread:0x00000001e4c3b0>):
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:276:in `exec'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:276:in `block in clear_cache!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:275:in `each_value'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:275:in `clear_cache!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:303:in `disconnect!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:202:in `block in disconnect!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:201:in `each'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:201:in `disconnect!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/core_ext/module/synchronization.rb:35:in `block in disconnect_with_synchronization!'
from /home/deployer/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/core_ext/module/synchronization.rb:34:in `disconnect_with_synchronization!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:395:in `block in clear_all_connections!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:395:in `each_value'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:395:in `clear_all_connections!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_specification.rb:123:in `clear_all_connections!'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/utils.rb:398:in `before_handling_requests'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/rack/application_spawner.rb:204:in `start_request_handler'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/rack/application_spawner.rb:170:in `block in handle_spawn_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/utils.rb:479:in `safe_fork'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/rack/application_spawner.rb:165:in `handle_spawn_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server.rb:180:in `start'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/rack/application_spawner.rb:128:in `start'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/spawn_manager.rb:253:in `block (2 levels) in spawn_rack_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/spawn_manager.rb:246:in `block in spawn_rack_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server_collection.rb:82:in `block in synchronize'
from <internal:prelude>:10:in `synchronize'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/spawn_manager.rb:244:in `spawn_rack_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/helper-scripts/passenger-spawn-server:99:in `<main>'
2011/08/31 15:25:49 [error] 21197#0: *41173 upstream prematurely closed connection while reading response header from upstream, client: 78.47.253.164, server: yandex.ru, request: "GET / HTTP/1.0", upstream: "passenger:unix:/passenger_helper_server:", host: "yandex.ru"
[ pid=21160 thr=139775298115328 file=ext/nginx/HelperAgent.cpp:584 time=2011-08-31 15:25:49.31 ]: Uncaught exception in PassengerServer client thread:
exception: Cannot read response from backend process: Connection reset by peer (104)
backtrace:
in 'void Client::forwardResponse(Passenger::SessionPtr&, Passenger::FileDescriptor&, const Passenger::AnalyticsLogPtr&)' (HelperAgent.cpp:330)
in 'void Client::handleRequest(Passenger::FileDescriptor&)' (HelperAgent.cpp:510)
in 'void Client::threadMain()' (HelperAgent.cpp:603)
2011/08/31 15:25:49 [error] 21197#0: *41172 upstream prematurely closed connection while reading response header from upstream, client: 78.47.253.164, server: yandex.ru, request: "GET / HTTP/1.0", upstream: "passenger:unix:/passenger_helper_server:", host: "yandex.ru"
[ pid=21257 thr=15884760 file=utils.rb:176 time=2011-08-31 15:25:49.032 ]: *** Exception PGError in application (server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
) (process 21257, thread #<Thread:0x00000001e4c3b0>):
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:276:in `exec'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:276:in `block in clear_cache!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:275:in `each_value'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:275:in `clear_cache!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:303:in `disconnect!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:202:in `block in disconnect!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:201:in `each'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:201:in `disconnect!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/core_ext/module/synchronization.rb:35:in `block in disconnect_with_synchronization!'
from /home/deployer/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/core_ext/module/synchronization.rb:34:in `disconnect_with_synchronization!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:395:in `block in clear_all_connections!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:395:in `each_value'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:395:in `clear_all_connections!'
from /home/deployer/yandex.ru/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_specification.rb:123:in `clear_all_connections!'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/utils.rb:398:in `before_handling_requests'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/rack/application_spawner.rb:204:in `start_request_handler'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/rack/application_spawner.rb:170:in `block in handle_spawn_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/utils.rb:479:in `safe_fork'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/rack/application_spawner.rb:165:in `handle_spawn_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server.rb:180:in `start'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/rack/application_spawner.rb:128:in `start'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/spawn_manager.rb:253:in `block (2 levels) in spawn_rack_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/spawn_manager.rb:246:in `block in spawn_rack_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server_collection.rb:82:in `block in synchronize'
from <internal:prelude>:10:in `synchronize'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/spawn_manager.rb:244:in `spawn_rack_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
from /home/deployer/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/helper-scripts/passenger-spawn-server:99:in `<main>'
答案 0 :(得分：8)
我自己找到了解决方案。 passenger_spawn_method conservative必须写入nginx.conf而不是默认passenger_spawn_method conservative smart-lv2。
答案 1 :(得分：0)
您是在分配还是管理自己的数据库连接/池？
Passenger重新连接每个后台工作程序的默认ActiveRecord数据库池。
但是，在分叉后，需要为每个工作人员手动设置/重新连接其他资源或手动管理的数据库连接。
我写了一篇详细的博客文章，解释了如何解决这个问题：http://blog.winfieldpeterson.com/2011/01/06/passenger-resource-collision/
这听起来就像您正在经历的那样，多个工作人员试图共享单个数据库连接并因资源争用而在负载下产生错误。
答案 2 :(得分：-1)
我们在Rails 3.1，pg，ruby 1.9.3和使用Apache + Passenger 3.0.9时遇到了同样的问题。升级到Rails 3.1.1似乎解决了这个问题。