It is an in-memory data structure store which is used as a database, cache, message broker, and streaming engine.
How to use Redis pub/sub to handle socket.io sessions across multiple instances ? First of all let’s understand Redis. In forthcoming blogs, we will look at Redis Search, Redis Stream, pub-sub, and many more topics. Create Logger for Microservices Powered By RedisSearch & RedisJSON Don’t forget to try Redis, and we’ll continue the series as a Redis Stack. Another approach might be to use a centralized data store like Redis but this will increase latency and cause race conditions. System Design: Rate Limiting The simplest way to solve this problem is to use sticky sessions in our load balancers so that each consumer gets sent to exactly one node but this causes a lack of fault tolerance and scaling problems. This functionality will be handled by the presence service combined with Redis or Memcached as our cache. System Design: WhatsApp This will give us the last time the user was active. 
For this use case, we can use Redis or Memcached servers alongside our API server.
As per our estimations, we will require around ~35 GB of memory per day to cache 20% of the incoming requests to our services.
System Design: URL Shortener Now, let's talk about caching. Now they are abundant and reliable and pretty nice. I highly reccomend coupling it with a pdf product called FOXIT.įreewares by college professors and tech teams have always been a great thing. Open Office is the ONLY word product I use. windows later may not recognize the access file in its system needed to find them and make them accessible all because they were referenced in your previous OS. Even if you try storing them on another drive or partition. Especially since MS office suite auto links all your office suite items to your operating system files and guess what if some virus or malware gets into your machine. Considering the nightmares that 4 out of the last 5 windows operating systems have been, thats scary.Ĭount them up: Vista bad, 7 great, 8 bad, 8.1 marginal but bad, 10 going fastly to the bad. Trying to use MS Office Suite is only as good as the operating system you have and computer you have to run them off of. That company has left all computer users subject to hackers, malwares, adwares, and system crashes for several decades. To the life of me I cant figure why so many people are so diehard about microsoft products.
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