Distributed Systems

BaraDB supports distributed deployment with Raft consensus, sharding, and replication.

Raft Consensus

Leader election and log replication:

import barabadb/core/raft

var cluster = newRaftCluster()
cluster.addNode("node1")
cluster.addNode("node2")
cluster.addNode("node3")

let n1 = cluster.nodes["n1"]
n1.becomeCandidate()
n1.becomeLeader()
let entry = n1.appendLog("SET key1 value1")

Sharding

Distribute data across nodes:

import barabadb/core/sharding

var router = newShardRouter(ShardConfig(
  numShards: 4,
  replicas: 2,
  strategy: ssHash
))
router.rebalance(@["node1", "node2", "node3"])
let shard = router.getShard("user_123")

Sharding Strategies

Strategy	Description
`ssHash`	Hash-based sharding
`ssRange`	Range-based sharding
`ssConsistent`	Consistent hashing

Replication

import barabadb/core/replication

var rm = newReplicationManager(rmSync)
rm.addReplica(newReplica("r1", "10.0.0.1", 9472))
rm.connectReplica("r1")
let lsn = rm.writeLsn(@[1'u8, 2, 3])
rm.ackLsn("r1", lsn)

Replication Modes

Mode	Description
`rmSync`	Synchronous replication
`rmAsync`	Asynchronous replication
`rmSemiSync`	Semi-synchronous replication

Gossip Protocol

Membership and failure detection:

import barabadb/core/gossip

var g = newGossipManager()
g.addNode("node1")
g.addNode("node2")
g.tick()  # Exchange membership info

Distributed Transactions

Two-phase commit across nodes:

import barabadb/core/disttxn

var dt = newDistributedTxn()
dt.prepare(@["node1", "node2"])
dt.commit()

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