Replication And Sharding

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Sharding

Splitting up databases in bunch of different databases are known as SHARDING.

Split up your tables store some rows in one shard and certain rows in other shard.

Example Any payment coming from USA is going shard 1 and any payment coming from India goes to shard 2.

Hotspots

Some shard get more data than other. In order to solve the problem we should use consistent hashing. If DB go down then you need Replica you can not use consistent hashing

How to run

Running Database Servers for Shard 1

Open new powershell in admin mode from the root of this project. And run below script:

• Run $env:PORT="3000"; $env:DATA_DIR="aedb_data_0"; node aedb.mjs

Running Database Servers for Shard 1

Open new powershell in admin mode from the root of this project. And run below script.

• Run $env:PORT="3001"; $env:DATA_DIR="aedb_data_1"; node aedb.mjs

Running reverse proxy server

Open new powershell in admin mode from the root of this project. And run below script:

• Run node aedb_proxy.mjs

Running client

Posting Data to Shard running at port 3001

Use fiddler or postman to make Http Post to http://localhost:8000/a address and using below JSON.

{
	"data":"Rupesh how are you?"
}

Getting Data from Shard running at port 3001

Use fiddler or postman to make Http Get to http://localhost:8000/a address.

Posting Data to Shard running at port 3000

Use fiddler or postman to make Http Post to http://localhost:8000/b address and using below JSON.

{
	"data":"Hello data in shard 0?"
}

Getting Data from Shard running at port 3000

Use fiddler or postman to make Http Get to http://localhost:8000/b address.