var/www/discourse/plugins/docker_manager/lib/docker_manager/upgrader.rb:49:in `upgrade' var/www/discourse/plugins/docker_manager/lib/docker_manager/upgrader.rb:288:in `reload_unicorn' var/www/discourse/plugins/docker_manager/lib/docker_manager/upgrader.rb:242:in `log' var/www/discourse/plugins/docker_manager/lib/docker_manager/upgrader.rb:161:in `publish' *** Please be patient, next steps might take a while ***
#Ruby redisclient upgrade#
I use this installation to test for features before rolling them out onto the actual live one.Ĭlicking on the upgrade button from the admin panel and then the start upgrade returned this error: ******************************************************** I received the notification and this is a simple instance without any user activity beside admins. It is within this method chain that common behavior such as logging andĬonnection management are guaranteed.Didn’t find any topic when searching for “upgrade failed” that were mentioning this version upgrade. AllĬommands executed by the client are centralized, passing through a chain of base How does the client know to reconnect after a fork? It’s relatively simple. Was successful in overwriting foo with the value 2, so we know everything Immediately after setting the value 1 a child process isįorked, inheriting the parent’s Redis instance, connection and all.Īfter waiting for the process to return we can see that it exited without a Without this initial connection before the fork there wouldn’t be any socket
Lazy, so it will only establish a connection the first time a command is sent. Then forces a connection to be established by calling set.
#Ruby redisclient code#
The code snippet starts out by instantiating a client in the parent process. set ( "foo", 2 ) rescue Redis :: InheritedError exit 127 end end _, status = Process. set ( "foo", 1 ) child_pid = fork do begin redis. Stealing the Fork Safety Testįor proof of the reconnection claim and a concrete point of reference we’llĬo-opt an example from the redis-rb test suite. This post aims to provide some more context andĪ whiff of exploration into how the redis client heals itself. Reconnecting after a child forks is just one of the errors that the Redis client To reconnect to Redis after forking or set :inherit_socket to true. Tried to use a connection from a child process without reconnecting. Warning you about the insanity that would ensue: The alternative to manually reconnecting was an error from Redis Socket between multiple processes, a recipe for unpredictable behavior and That was in order to avoid sharing the same Was common, historically, to force a Redis reconnect after a Unicorn or PumaĬluster forked off child workers. The good news is, after redis-rb 3.1.0 you don’t need to How would you suggest I reconnect the unicorn worker to the redis-based cache This was an implementation of the redis-store gem, which you aren’t using I had to reconnect to redis after forking. In my config/unicorn.rb, before switching to readthis, When restarting unicorn with the USR2 signal, a new master is created and To force Redis to reconnect after the application booted: Recently a new user of the Readthis caching library inquired about where
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