Question

我在Heroku上运行了一个Ruby on Rails应用程序。我一直在日志中收到这些消息：

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

我无法弄清楚造成这种情况的原因。该应用程序运行Cedar 10堆栈，ruby 2.1.4，rails 3.2.11和puma 2.11.2与3名工作人员和1个线程。它不会在开发或登台环境中发生，仅在Heroku上发生。

正在运行：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（最小和最大线程数等于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

关于如何追踪这个的任何想法？

更新：我向on_worker_boot块添加了调试消息，它只在应用程序启动时调用，所以我仍然不知道为什么连接会如此频繁地建立。< / p>

Answer 1

这是关于建立与Postgres的连接的随意日志。所以，只需忽略它们或尝试在postgresql.conf中禁用它们（请参阅log_connections选项），但我不认为您可以在Heroku中访问它。

Answer 2

不适用于Heroku，但您是否尝试使用xray等工具获取ruby进程的线程转储？ http://blog.pivotal.io/labs/labs/inspect-running-ruby-processes-using-xray-and-kill-3

线程堆栈可能有助于指出这些调用的来源。

我的应用程序不断创建数据库连接，如何跟踪原因？

2 个答案: