Replicated Key-Value Store with Configurable Consistency

This project is inspired by cassandra distributed key-value store. Project features include configurable consistency level for writes and reads (quorum or one), hinted-handoff mechanism, write-ahead logs for failure recovery and replication. key range is between 0 and 255 and is equally split between all nodes. following operations are supported:

get `[key]` – given a key, return its corresponding value.

put `[key] [value]` – if the key does not already exist, create a new key-value pair; otherwise, update the key to the new value.

build server:

make server

start 4 server replicas:

./server 1_snitch.txt

./server 2_snitch.txt

./server 3_snitch.txt

./server 4_snitch.txt

build client:

make client

run client:

./client 1_snitch.txt

commands supported by client:

put <key> <value> [-c <one|o|O> | <quorum|q|Q>] [-v]

get <key> [-c <one|o|O> | <quorum|q|Q>] [-v]

select <coordinator node>

-c flag specifies desired consistency. -v flag print output in a verbose way.

Note: update snitch files with correct ip addresses. first corresponding entry in the snitch file indicates server's own ip and port address mapping and is used to initialize the server.

to rebuild server: clears all write-ahead logs

make restart