redis-rb

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We've been having some issues with a threaded app that is using a connection pool too manage multiple Redis connections with this gem. On start-up, we intermittently get IOError exceptions. I've been digging through the code base, but have had no luck pinpointing the issue.

I did try both the latest release (4.0.3) and head (9101933).

Not sure if it's a bug or an issue with how the gem is being used, but I'm hoping for some assistance.

IOError: closed stream
    write_nonblock at org/jruby/RubyIO.java:1365
  _write_to_socket at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/connection/ruby.rb:87
             write at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/connection/ruby.rb:113
              loop at org/jruby/RubyKernel.java:1425
             write at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/connection/ruby.rb:112
             write at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/connection/ruby.rb:380
             write at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/client.rb:281
                io at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/client.rb:260
             write at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/client.rb:279
           process at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/client.rb:238
              each at org/jruby/RubyArray.java:1792
           process at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/client.rb:232
  ensure_connected at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/client.rb:384
           process at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/client.rb:231
           logging at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/client.rb:339
           process at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/client.rb:230
              call at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis/client.rb:125
               get at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis.rb:914
       synchronize at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis.rb:52
   mon_synchronize at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/monitor.rb:226
       synchronize at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis.rb:52
               get at /jruby-app/vendor/bundler/jruby/2.5.0/bundler/gems/redis-rb-9101933c84d1/lib/redis.rb:913
               get at /lib/redis/redis_store.rb:71
              with at /jruby-app/vendor/bundler/jruby/2.5.0/gems/connection_pool-2.2.2/lib/connection_pool.rb:65
  handle_interrupt at org/jruby/RubyThread.java:759
              with at /jruby-app/vendor/bundler/jruby/2.5.0/gems/connection_pool-2.2.2/lib/connection_pool.rb:64
  handle_interrupt at org/jruby/RubyThread.java:759
              with at /jruby-app/vendor/bundler/jruby/2.5.0/gems/connection_pool-2.2.2/lib/connection_pool.rb:61

If it's relevant, I'm creating the pool like so:

pool = ConnectionPool.new(size: pool_size, timeout: pool_timeout) do
    Redis.new(redis_config)
end

Did you try against different servers? I'm asking this because the exception suggest the connection was closed by the server. It could be a configuration issue with your server, or some network issue.

That being said the library should handle such error better.

I did try against different servers. I've seen it on Ubuntu and was able to reproduce with the same code base on MacOS.

Closing as non actionable.

I assume the server is closing the connection for some reason (maybe max-clients?). I don't see anything we can do about it.