Redis::TimeoutError：连接超时错误 -Rails 缓存

Question

我们使用 redis(Elasticache) 作为我们的缓存存储。由于 redis 连接超时，我们的应用程序遇到崩溃。我们有三个应用程序服务器并使用 phusion guest。崩溃时大约有 200 个活动连接。

/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/connection/ruby.rb:55:in `rescue in _read_from_socket'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/connection/ruby.rb:48:in `_read_from_socket'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/connection/ruby.rb:41:in `gets'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/connection/ruby.rb:273:in `read'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:248:in `block in read'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:236:in `io'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:247:in `read'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:112:in `block in call'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:217:in `block (2 levels) in process'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:353:in `ensure_connected'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:207:in `block in process'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:292:in `logging'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:206:in `process'
/home/chillr/deploy/chillr-api/shared/vendor/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:112:in `call'

SlOWLOG 命令

1) 1) (integer) 6867375
2) (integer) 1486701507
3) (integer) 62008
4) 1) "eval"
   2) "for i, name in ipairs(redis.call('KEYS', 'cache:user_transaction_logs:*:9008245678')) do redis.call('DEL', name); end"
   3) "0"
 2) 1) (integer) 6867374
    2) (integer) 1486701507
    3) (integer) 61989
    4) 1) "KEYS"
       2) "cache:user_transaction_logs:*:9008245678"
 3) 1) (integer) 6867373
    2) (integer) 1486701507
    3) (integer) 61026
    4) 1) "eval"
       2) "for i, name in ipairs(redis.call('KEYS', 'cache:user_transaction_logs:*:8888662136')) do redis.call('DEL', name); end"
       3) "0"
 4) 1) (integer) 6867372
    2) (integer) 1486701507
    3) (integer) 61006
    4) 1) "KEYS"
       2) "cache:user_transaction_logs:*:8888662136"
 5) 1) (integer) 6867371
    2) (integer) 1486701507
    3) (integer) 63070
    4) 1) "eval"

我们使用

• Elasticache 缓存。
• t2.中型 Phusion 乘客

崩溃时的连接数 175..200

创业板 雷迪斯（3.2.1） redis-rails (5.0.1)

可以做什么

Answer 1

监控 Redis 服务器当前的资源使用情况。 暂时增加你的redis连接的连接超时。

首先尝试这个检查清单

https://redis.io/topics/latency