您好,我们正在Heroku的Cedar堆栈上运行Unicorn和Sidekiq。我们断断续续地得到以下错误
BurnThis ActiveRecord::StatementInvalid: PG::UnableToSend: SSL SYSCALL error: EOF detected
ActiveRecord::StatementInvalid: PG::ConnectionBad: PQconsumeInput() SSL SYSCALL error: Connection timed out
有谁知道这些错误的直接原因是什么?是不是我们的数据库连接太多了?我们已经通过以下方式设置了我们的forking:
unicorn.rb
worker_processes Integer(ENV["WEB_CONCURRENCY"] || 3)
timeout 30
preload_app true
before_fork do |server, worker|
Signal.trap 'TERM' do
puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
Process.kill 'QUIT', Process.pid
end
defined?(ActiveRecord::Base) and
ActiveRecord::
Base.connection.disconnect!
end
after_fork do |server, worker|
Signal.trap 'TERM' do
puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT'
end
# other setup
if defined?(ActiveRecord::Base)
config = Rails.application.config.database_configuration[Rails.env]
config['adapter'] = 'postgis'
config['pool'] = ENV['DB_POOL'] || 5
config['reaping_frequency'] = ENV['DB_REAP_FREQ'] || 10 # seconds
ActiveRecord::Base.establish_connection(config)
end
end
和sidekiq.rb
Sidekiq.configure_server do |config|
config.redis = { :url => ENV['REDIS_URL'], :namespace => 'btsidekiq' }
if defined?(ActiveRecord::Base)
config = Rails.application.config.database_configuration[Rails.env]
config['adapter'] = 'postgis'
config['pool'] = ENV['DB_POOL'] || 5
config['reaping_frequency'] = ENV['DB_REAP_FREQ'] || 10 # seconds
ActiveRecord::Base.establish_connection(config)
end
end
Sidekiq.configure_client do |config|
config.redis = { :url => ENV['REDIS_URL'], :namespace => 'btsidekiq' }
end
我们的数据库池大小是相当大的DB_POOL=100,而且我们使用的PG数据库显然支持500个并发连接。
发布于 2014-03-12 23:39:57
此错误是由您的postgis
适配器尝试使用ActiveRecord连接池中的陈旧/失效连接引起的。有两种方法可以解决这个问题:
收割机调整连接池大小以匹配threads/process
要实现#1,您需要为Unicorn和Sidekiq设置合适的池大小,这两个池可能有不同的需求。
Unicorn是单线程的,因此每个进程的5
连接的缺省池大小对您来说是正确的。这将为每个WEB_CONCURRENCY
后端独角兽工作进程分配最多5个连接。您应重置缺省池大小并使用现有unicorn.rb
$> heroku config:set DB_POOL=5
然而,Sidekiq使用了一个非常不同的模型。默认情况下,Sidekiq只有一个进程和N个线程。您希望DB池大小略大于Sidekiq线程数。您可以在config/initializers/sidekiq.rb
中实现此功能,如下所示:
Sidekiq.configure_server do |config|
pool_size = Sidekiq.options[:concurrency] + 2
config.redis = { :url => ENV['REDIS_URL'], :namespace => 'btsidekiq', :size => pool_size }
if defined?(ActiveRecord::Base)
config = Rails.application.config.database_configuration[Rails.env]
config['adapter'] = 'postgis'
config['pool'] = pool_size
config['reaping_frequency'] = ENV['DB_REAP_FREQ'] || 10 # seconds
ActiveRecord::Base.establish_connection(config)
end
end
我最好的猜测是,使用如此大的100个连接池,您更有可能增加无效连接。适当地调整池的大小应该可以解决这个问题。
如果这不起作用,您应该尝试将DB_REAP_FREQ
降低到5秒。
https://stackoverflow.com/questions/19802233
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