ffmpeg pipe images to redis
I need to find a way to save ffmpeg frames into redis variable. Currently I'm piping png images from ffmpeg to redis but it concatenate all images: ffmpeg -re -i udp://127.0.0.1:5545 -c:v png -r 1 -update 1 - | redis-cli…
Redis Timeseries, rolling sum with LUA
I have a timeseries I want to compute a rolling sum of. My idea (which is probably suboptimal already) is to have a script to compute each data point then run it from python in a pipeline. I struggle with…
Redis – Rate limiting load balanced environment using a distributed cache
My question is about a fundamental functionality of the distributed cache, my use case is a rate limiter implementation on a load balanced environment, each request from the same endpoint should increment a request-counter for that endpoint, I'm trying to…
Why Redis get in async function is too slow?
I have a code that looks like the following console.time('setfoo') redis.set('foo', 'bar') ... let result = await redis.get('foo') console.timeEnd('setfoo') Response time for this get is 263ms but when I remove await it goes down to 0.037ms What could be the…
Redis – HTTP 400 Error on AWS ElasticBeanstalk with ALB and Socket.IO
I have an Elastic Beanstalk environment with Application Load Balancer (ALB) setup on Node.js instance which server both REST APIs as well as Socket.IO connections. When the number of EC2 instances is more than one some of Socket.IO connections are…
Laravel Echo Server, Redis, Socket.IO: Can't seem to make them work
I'm developing real-time app with Laravel. Since I don't want to use Pusher, I'm trying to make websockets work using Laravel Echo Server, Redis, and Socket.IO. However, I'm having a problem with this stack. The client (browser) can't seem to…
Is there any reason to use multi/watch/exec instead of Lua script (eval) in Redis?
I'm new to Redis, and this is how I see it: It seems to me that watch/multi/exec is a rather awkward way of implementing optimistic transaction. The duration between watch and exec can be quite long and would typically last…
session data in Redis – key/value or hash type?
We are moving our session storage from on the app server to redis. The session value is about 2k (it is huge I know, it will be shrunk drastically in the future). We will have about 10 million session stored…
Redis – Avoiding Double Booking / Double Spending
I'm running a high throughput application in which many auction-like processes happen every second and budgets are spent based on auction-winning bids. However, there's a slight latency between the moment a bid is placed and the time when the auction…
Retrieving messages from redis stream
I have a NodeJS application that is using Redis stream (library 'ioredis') to pass information around. The problem is that when I add a message to a stream and I try to retrieve it, I have to go down a…