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111 lines
2.4 KiB
Markdown
111 lines
2.4 KiB
Markdown
# Distributed Systems
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BaraDB unterstützt verteiltes Deployment mit Raft Consensus, Sharding und Replikation.
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## Raft Consensus
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Leader Election und Log-Replikation:
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```nim
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import barabadb/core/raft
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var cluster = newRaftCluster()
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cluster.addNode("node1")
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cluster.addNode("node2")
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cluster.addNode("node3")
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let n1 = cluster.nodes["n1"]
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n1.becomeCandidate()
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n1.becomeLeader()
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let entry = n1.appendLog("SET key1 value1")
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```
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## Sharding
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Daten über Knoten verteilen:
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```nim
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import barabadb/core/sharding
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var router = newShardRouter(ShardConfig(
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numShards: 4,
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replicas: 2,
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strategy: ssHash
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))
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router.rebalance(@["node1", "node2", "node3"])
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let shard = router.getShard("user_123")
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```
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### Sharding-Strategien
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| Strategie | Beschreibung |
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|----------|-------------|
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| `ssHash` | Hash-basiertes Sharding |
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| `ssRange` | Range-basiertes Sharding |
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| `ssConsistent` | Consistent Hashing |
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## Replikation
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```nim
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import barabadb/core/replication
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var rm = newReplicationManager(rmSync)
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rm.addReplica(newReplica("r1", "10.0.0.1", 9472))
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rm.connectReplica("r1")
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let lsn = rm.writeLsn(@[1'u8, 2, 3])
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rm.ackLsn("r1", lsn)
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```
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### Replikationsmodi
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| Modus | Beschreibung |
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|-------|--------------|
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| `rmSync` | Synchronous Replikation |
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| `rmAsync` | Asynchrone Replikation |
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| `rmSemiSync` | Semi-synchrone Replikation |
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## Gossip Protocol
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Membership und Failure-Erkennung:
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```nim
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import barabadb/core/gossip
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var g = newGossipManager()
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g.addNode("node1")
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g.addNode("node2")
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g.tick() # Membership-Info austauschen
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```
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## Distributed Transactions
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Two-Phase Commit über Knoten:
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```nim
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import barabadb/core/disttxn
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var dt = newDistributedTxn()
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dt.prepare(@["node1", "node2"])
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dt.commit()
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```
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## Formale Verifikation
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Kern-Algorithmen für Distributed Systems sind formal in TLA+ spezifiziert und model-gecheckt:
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- **Raft Consensus** — `formal-verification/raft.tla`
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- Verifiziert: ElectionSafety, StateMachineSafety
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- **Two-Phase Commit** — `formal-verification/twopc.tla`
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- Verifiziert: Atomicity, NoOrphanBlocks
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- **Replication** — `formal-verification/replication.tla`
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- Verifiziert: MonotonicLsn, AcksRemovePending
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TLC lokal ausführen:
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```bash
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cd formal-verification
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java -cp tla2tools.jar tlc2.TLC -config models/raft.cfg raft.tla
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java -cp tla2tools.jar tlc2.TLC -config models/twopc.cfg twopc.tla
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java -cp tla2tools.jar tlc2.TLC -config models/replication.cfg replication.tla
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```
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