How do I delete everything in Redis?
With redis-cli: FLUSHDB – Deletes all keys from the connection’s current database. FLUSHALL – Deletes all keys from all databases. For example, in your shell: redis-cli flushall
redis
How to reuse redis connection in socket.io?
Actually you are only creating a new redis client for every connection if you are instantiating the client on the “connection” event. What I prefer to do when creating a chat system is to create three redis clients. One for publishing, subscribing, and one for storing values into redis. for example: var socketio = require(“socket.io”) … Read more
How to use redis PUBLISH/SUBSCRIBE with nodejs to notify clients when data values change?
OLD only use a reference Dependencies uses express, socket.io, node_redis and last but not least the sample code from media fire. Install node.js+npm(as non root) First you should(if you have not done this yet) install node.js+npm in 30 seconds (the right way because you should NOT run npm as root): echo ‘export PATH=$HOME/local/bin:$PATH’ >> ~/.bashrc … Read more
Could not load file or assembly System.Runtime.CompilerServices.Unsafe
Could not load file or assembly System.Runtime.CompilerServices.Unsafe It seems that you have installed System.Runtime.CompilerServices.Unsafe nuget package 4.5.3 version. And it corresponds to System.Runtime.CompilerServices.Unsafe.dll assembly version 4.0.4.1. Suggestion 1) Please try to register System.Runtime.CompilerServices.Unsafe version 4.0.4.1 into GAC so that the system can it. Run Developer Command Prompt for VS2019 as Administrator type: cd xxxxx (the … Read more
MISCONF Redis is configured to save RDB snapshots
Using redis-cli, you can stop it trying to save the snapshot: config set stop-writes-on-bgsave-error no This is a quick workaround, but if you care about the data you are using it for, you should check to make sure why bgsave failed in first place.
What’s the Point of Multiple Redis Databases?
You don’t want to use multiple databases in a single redis instance. As you noted, multiple instances lets you take advantage of multiple cores. If you use database selection you will have to refactor when upgrading. Monitoring and managing multiple instances is not difficult nor painful. Indeed, you would get far better metrics on each … Read more
Scaling Socket.IO to multiple Node.js processes using cluster
Edit: In Socket.IO 1.0+, rather than setting a store with multiple Redis clients, a simpler Redis adapter module can now be used. var io = require(‘socket.io’)(3000); var redis = require(‘socket.io-redis’); io.adapter(redis({ host: ‘localhost’, port: 6379 })); The example shown below would look more like this: var cluster = require(‘cluster’); var os = require(‘os’); if (cluster.isMaster) … Read more
ServiceStack.Net Redis: Storing Related Objects vs. Related Object Ids
Rather than re-hash a lot of other documentation that’s out there in the wild, I’ll list a couple around for some background info around Redis + ServiceStack’s Redis Client: What to think about when designing a NoSQL Redis application Designing a NoSQL Database using Redis General Overview of Redis and .NET Schemaless versioning and Data … Read more
How to implement server push in Flask framework?
Have a look at Server-Sent Events. Server-Sent Events is a browser API that lets you keep open a socket to your server, subscribing to a stream of updates. For more Information read Alex MacCaw (Author of Juggernaut) post on why he kills juggernaut and why the simpler Server-Sent Events are in manny cases the better … Read more
Autocomplete with java , Redis, Elastic Search , Mongo
It’s a critical search use case, and MongoDB and Redis are perfect for key-based lookups and not use for Search purposes, while Elasticsearch is a distributed search engine, built specifically for such use-case. Before choosing the system, you should know how your feature works internally And below the consideration for selecting it. Non-functional requirements for … Read more