如何防范Redis :: TimeoutError:Heroku上的连接超时

时间:2015-11-16 01:46:16

标签: ruby-on-rails heroku redis resque resque-retry

这可能看起来像一个愚蠢的问题,但我认为StackOverflow上的某个人可能对此有一些想法。怎么了,对吧?

我使用带有1X Dynos的Heroku工作人员来运行Resque。有时我会收到此错误:Redis::TimeoutError: Connection timed out。它发生在redis宝石中;这是堆栈跟踪:

Redis::TimeoutError Connection timed out
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/connection/ruby.rb:55 rescue in _read_from_socket
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/connection/ruby.rb:48 _read_from_socket
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/connection/ruby.rb:41 gets
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/connection/ruby.rb:273 read
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:245 block in read
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:233 io
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:244 read
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:175 block in call_pipelined
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:214 block (2 levels) in process
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:340 ensure_connected
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:204 block in process
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:286 logging
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:203 process
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:174 call_pipelined
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:146 block in call_pipeline
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:273 with_reconnect
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis/client.rb:144 call_pipeline
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis.rb:2101 block in pipelined
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis.rb:37 block in synchronize
    vendor/ruby-2.1.5/lib/ruby/2.1.0/monitor.rb:211 mon_synchronize
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis.rb:37 synchronize
    vendor/bundle/ruby/2.1.0/gems/redis-3.2.0/lib/redis.rb:2097 pipelined
    vendor/bundle/ruby/2.1.0/gems/redis-namespace-1.5.1/lib/redis/namespace.rb:413 namespaced_block
    vendor/bundle/ruby/2.1.0/gems/redis-namespace-1.5.1/lib/redis/namespace.rb:265 pipelined
    vendor/bundle/ruby/2.1.0/gems/resque-1.25.2/lib/resque.rb:214 push
    vendor/bundle/ruby/2.1.0/gems/resque-1.25.2/lib/resque/job.rb:153 create
    vendor/bundle/ruby/2.1.0/gems/resque_solo-0.1.0/lib/resque_ext/job.rb:7 create_solo
    vendor/bundle/ruby/2.1.0/gems/resque-1.25.2/lib/resque.rb:317 enqueue_to
    vendor/bundle/ruby/2.1.0/gems/resque-1.25.2/lib/resque.rb:298 enqueue

我们设置了resque-retry,但我想如果enqueue来电甚至无法连接到redis,那也无关紧要。

我目前的解决方案是使用Resque.enqueue打包每个begin/rescue来电,以便我们可以重新尝试enqueue来电(根据https://github.com/resque/resque/issues/840)。但是,还有更好的方法吗?

1 个答案:

答案 0 :(得分:1)

Heroku Redis允许您更改实例超时和maxmemory-policy设置。这些设置将在升级和HA故障转移期间保持不变。

来自documentation

  

超时设置设置Redis在终止空闲连接之前等待的秒数。值为零表示不会关闭连接。默认值为300秒(5分钟)。您可以使用CLI更改此值:

$ heroku redis:timeout maturing-deeply-2628 --seconds 60
     

成熟 - 超时2628(REDIS_URL)的超时设置为60秒。   在空闲60秒后,将停止与redis实例的连接。

resque的情况下看起来0(不使用连接超时)将是最好的选择( - 秒0)。