Basic ReDis Setup

Stage 1

1. It was just uncommenting some code that was already there.

Stage 2

1. Opened a TCP connection server that listens to a PING message

Stage 3

1. Learned about Redis serialization protocol RESP
2. Implemented a TCP connection that waits for two requests and responds with the message "PONG"

Stage 4

1. Handled 2 concurrent requests and responded with resp(+PONG/r/n)
2. Implemented with the help of go-routines 🙃

Stage 5

1. Handled concurrent requests and responded with custom message

Stage 6

1. Implemented GET / SET in RDB

Stage 7

1. Implemented GET / SET with px timeout command

🚀 Done with all the basic implementation of RDB

Replication Setup for Redis

Stage - 1

1. Run the redis server on custom port specified using the --port flag

Stage - 2

1. Added support for INFO REPLICATION COMMAND

Stage - 3 / 4

1. Added support to return the Master Node ID and Offset

Stage - 5 Send Handshake - 1 / 3

1. Pinged the Master node :)
2. I'm yet to Refactor the code

Stage - 6 Send Handshake - 2 / 3

1. Received and pinged master twice again :)

Stage - 7 Send Handshake - 3 / 3

1. Relayed the PSYNC to master node

🚀 SEND Handshake done

Stage - 8 Receive Handshake - 1 / 2

1. Relayed back message acting as a master node. (for REPLCONF)

Stage - 9 Receive Handshake - 2 / 2

1. Relayed back message for PSYNC. Relayed FULLSYNC which tells the worker node that master is unable to perform incremental synchronization so it will perform full synchronization with the worker.

🚀 Receive Handshake done

Stage - 10 Sending RDB

1. Responded with a RDB state file for full synchronization to take place on the worker node

Stage - 11 Single node replication

1. After sending the RDB to the worker node, we need replicate the commands that the master receives.
2. Single node replication implemented

Stage - 12 Multi node replication

1. Implemented multi-node replication
2. Forgot to close the connection object in the previous stage, fixed it here.

Go is actually so cool, became a bigger fan of go routines

Stage - 13 Command Processing

1. Pushed the commands from the master node to the worker nodes
2. Took me 4 days

Stage - 14 ACKs with no commands

1. Replied for REPLCONF GETACK command from the worker node to the master node

Pending tasks

• Code Refactoring
• Use RW.mutex on global slice storing the worker node's connection object