我有一个运行在Heroku上的Ruby on Rails应用程序。日志中一直出现以下信息:
2015-05-05T16:11:14Z app[postgres.27102]: [AQUA] connection received: host=xx.xxx.xx.26 port=60278
2015-05-05T16:11:14Z app[postgres.27102]: [AQUA] connection authorized: user=postgres database=somedb
2015-05-05T16:11:14Z app[postgres.27103]: [AQUA] connection received: host=xx.xxx.xx.26 port=60291
2015-05-05T16:11:14Z app[postgres.27103]: [AQUA] connection authorized: user=postgres database=postgres
2015-05-05T16:11:18Z app[postgres.27104]: [AQUA] connection received: host=xx.xxx.x.166 port=54180
2015-05-05T16:11:18Z app[postgres.27104]: [AQUA] connection authorized: user=postgres database=somedb
2015-05-05T16:11:23Z app[postgres.27105]: [AQUA] connection received: host=xx.xxx.x.166 port=55488
2015-05-05T16:11:23Z app[postgres.27105]: [AQUA] connection authorized: user=postgres database=somedb
2015-05-05T16:11:28Z app[postgres.27106]: [AQUA] connection received: host=xx.xxx.x.166 port=56774
2015-05-05T16:11:28Z app[postgres.27106]: [AQUA] connection authorized: user=postgres database=somedb
2015-05-05T16:11:28Z app[postgres.27107]: [AQUA] connection received: host=xx.xxx.x.166 port=56854
2015-05-05T16:11:28Z app[postgres.27107]: [AQUA] connection authorized: user=postgres database=somedb
2015-05-05T16:11:28Z app[postgres.27108]: [AQUA] connection received: host=xx.xxx.x.166 port=56885
2015-05-05T16:11:28Z app[postgres.27108]: [AQUA] connection authorized: user=postgres database=somedb
2015-05-05T16:11:28Z app[postgres.27109]: [AQUA] connection received: host=xx.xxx.x.166 port=56912
2015-05-05T16:11:28Z app[postgres.27109]: [AQUA] connection authorized: user=postgres database=somedb
2015-05-05T16:11:33Z app[postgres.27110]: [AQUA] connection received: host=xx.xxx.x.166 port=58039
2015-05-05T16:11:33Z app[postgres.27110]: [AQUA] connection authorized: user=postgres database=somedb
2015-05-05T16:11:38Z app[postgres.27111]: [AQUA] connection received: host=xx.xxx.x.166 port=59387
2015-05-05T16:11:38Z app[postgres.27111]: [AQUA] connection authorized: user=postgres database=somedb
2015-05-05T16:11:43Z app[postgres.27112]: [AQUA] connection received: host=xx.xxx.x.166 port=60944
2015-05-05T16:11:43Z app[postgres.27112]: [AQUA] connection authorized: user=postgres database=somedb
2015-05-05T16:11:14+00:00 app[heroku-postgres]: source=HEROKU_POSTGRESQL_AQUA sample#current_transaction=511990 sample#db_size=203303096bytes sample#tables=17 sample#active-connections=2 sample#waiting-connections=0 sample#index-cache-hit-rate=0.99997 sample#table-cache-hit-rate=0.94699 sample#load-avg-1m=0.14 sample#load-avg-5m=0.25 sample#load-avg-15m=0.24 sample#read-iops=0.1875 sample#write-iops=1 sample#memory-total=7629448kB sample#memory-free=428388kB sample#memory-cached=6784860kB sample#memory-postgres=171732kB
我无法弄清楚是什么原因导致了这个问题。该应用程序运行Cedar 10堆栈,ruby 2.1.4,rails 3.2.11和带有3个工作进程和1个线程的puma 2.11.2。这种情况并没有在开发或者测试环境中出现,只在Heroku上出现。
运行:select application_name from pg_stat_activity;
显示:
application_name
---------------------------------
puma: cluster worker 2: 3 [app]
puma: cluster worker 1: 3 [app]
puma: cluster worker 0: 3 [app]
psql johnny interactive
这是我的puma配置文件(最小和最大线程均为1):
workers Integer(ENV['PUMA_WORKERS'] || 3)
threads Integer(ENV['MIN_THREADS'] || 1), Integer(ENV['MAX_THREADS'] || 16)
preload_app!
rackup DefaultRackup
port ENV['PORT'] || 3000
environment ENV['RACK_ENV'] || 'development'
on_worker_boot do
# worker specific setup
ActiveSupport.on_load(:active_record) do
config = ActiveRecord::Base.configurations[Rails.env] ||
Rails.application.config.database_configuration[Rails.env]
config['pool'] = ENV['MAX_THREADS'] || 16
ActiveRecord::Base.establish_connection(config)
end
end
有没有任何想法可以追踪这个问题?
更新:我在on_worker_boot
块中添加了调试消息,但它只会在应用程序启动时被调用,所以我仍然不知道为什么连接如此频繁地建立。