I am trying to make a slack clone using node.js, redis, mongoDB and socket.io. I have read that slack is using redis in their app and i am wondering what&#39;s the reason behind this? I am struggling to understand the caching flow!
Is this diagram correct...??? 
<img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1550692118098/Tmv1ug_IZ.png" alt="Untitled Diagram.png">
<ul>
<li>What are the advantages of caching chat messages when users send new messages every second?</li>
<li>If you cache too many messages on redis wouldn&#39;t this be a problem?</li>
<li>What if server go down or some error occur? Am i going to miss all the data from redis?</li>
</ul>

I am trying to make a slack clone using node.js, redis, mongoDB and socket.io. I have read that slack is using redis in their app and i am wondering what's the reason behind this? I am struggling to understand the caching flow!

Is this diagram correct...??? 

![Untitled Diagram.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1550692118098/Tmv1ug_IZ.png)

+ What are the advantages of caching chat messages when users send new messages every second?
+ If you cache too many messages on redis wouldn't this be a problem?
+ What if server go down or some error occur? Am i going to miss all the data from redis?


How can i build slack clone with redis caching?

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