but I don’t understand how using RedisStore in that code would be any different from using MemoryStore. Can someone explain it to me? The difference is that when using the default MemoryStore, any message that you emit in a worker will only be sent to clients connected to the same worker, since there is no … Read more
A solution I just did (borrowing a lot from @teeg) which seems to work okay (haven’t failure tested it, tho) config/initializers/redis.rb $redis = Redis.new(:host => “xxxx.com”, :port => 6379) heartbeat_thread = Thread.new do while true $redis.publish(“heartbeat”,”thump”) sleep 30.seconds end end at_exit do # not sure this is needed, but just in case heartbeat_thread.kill $redis.quit end … Read more
Redis is a remote data structure server. It is certainly slower than just storing the data in local memory (since it involves socket roundtrips to fetch/store the data). However, it also brings some interesting properties: Redis can be accessed by all the processes of your applications, possibly running on several nodes (something local memory cannot … Read more
Redis runs in a seperate container which has seperate virtual ethernet adapter and IP address to the container your node application is running in. You need to link the two containers or create a user defined network for them docker network create redis docker run -d –net “redis” –name redis redis docker run -d -p … Read more
Sessions won’t work unless you have these 3 in this order: app.use(express.cookieParser()); app.use(express.session()); app.use(app.router); I’m not sure if router is mandatory to use sessions, but it breaks them if it’s placed before them.
You can’t connect directly to Redis from JavaScript running in a browser because Redis does not speak HTTP. What you can do is put webdis in front of Redis, it makes it possible work with a Redis instance over a HTTP interface.
There is a common pattern that solves this problem quite well. Use sorted sets, and use a timestamp as the score. It’s then trivial to delete items by score range, which could be done periodically, or only on every write, with reads always ignoring the out of range elements, by reading only a range of … Read more
If you have virtual memory functionality turned on (EDIT: now deprecated), then Redis starts to store the “not-so-frequently-used” data to disk when memory runs out. If virtual memory in Redis is disabled (the default) and the maxmemory parameter is set (the default), Redis will not use any more memory than maxmemory allows. If you turn … Read more
Actually, you can store python objects in redis using the built-in module pickle. Here is example. import pickle import redis r = redis.StrictRedis(host=”localhost”, port=6379, db=0) obj = ExampleObject() pickled_object = pickle.dumps(obj) r.set(‘some_key’, pickled_object) unpacked_object = pickle.loads(r.get(‘some_key’)) obj == unpacked_object