Error handling when Redis is not reachable

[ff-parasp]

We have configured message bus in our platform, it has been observed when redis is down our logs files are getting populated with following message, It tries to connect redis after regular interval of time, is there any way we can increase time interval so that there would be less occurrence in log file?

Error connecting to Redis on localhost:6379 (Errno::ECONNREFUSED) subscribe failed, reconnecting in 1 second. Call stack ["/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis/client.rb:353:in rescue in establish_connection'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis/client.rb:336:in establish_connection'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis/client.rb:104:in block in connect'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis/client.rb:299:in with_reconnect'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis/client.rb:103:in connect'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis/client.rb:279:in with_socket_timeout'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis/client.rb:136:in call_loop'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis/subscribe.rb:43:in subscription'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis/subscribe.rb:12:in subscribe'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis.rb:3474:in _subscription'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis.rb:2293:in block in subscribe'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis.rb:50:in block in synchronize'", "/usr/share/rvm/rubies/ruby-2.4.3/lib/ruby/2.4.0/monitor.rb:214:in mon_synchronize'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis.rb:50:in synchronize'", "/home/x/.rvm/gems/ruby-2.4.3/gems/redis-4.1.0/lib/redis.rb:2292:in subscribe'", "/home/x/.rvm/gems/ruby-2.4.3/gems/message_bus-2.2.0/lib/message_bus/backends/redis.rb:287:in global_subscribe'", "/home/x/.rvm/gems/ruby-2.4.3/gems/message_bus-2.2.0/lib/message_bus.rb:721:in global_subscribe_thread'", "/home/x/.rvm/gems/ruby-2.4.3/gems/message_bus-2.2.0/lib/message_bus.rb:669:in block in new_subscriber_thread'"]

[SamSaffron]

This is not configurable but you could define a custom logger that suppresses today.

https://github.com/SamSaffron/message_bus/blob/e2caee337ddf3ad09bba5c29b43be5219d2962eb/lib/message_bus/backends/redis.rb#L322

I do support a new config setting for the backend to tweak that number up or down.