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docs: synchronize documentation across all languages

- Add mcp.md to: bg, fa, ru, tr, zh, ar
- Add index.md to Bulgarian (bg)
- Add 24 missing German (de) documentation files

Translations for all supported languages now complete.

2026-05-17 16:29:28 +03:00

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Distributed Systems

BaraDB unterstützt verteiltes Deployment mit Raft Consensus, Sharding und Replikation.

Raft Consensus

Leader Election und Log-Replikation:

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

Daten über Knoten verteilen:

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-Strategien

Strategie	Beschreibung
`ssHash`	Hash-basiertes Sharding
`ssRange`	Range-basiertes Sharding
`ssConsistent`	Consistent Hashing

Replikation

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)

Replikationsmodi

Modus	Beschreibung
`rmSync`	Synchronous Replikation
`rmAsync`	Asynchrone Replikation
`rmSemiSync`	Semi-synchrone Replikation

Gossip Protocol

Membership und Failure-Erkennung:

import barabadb/core/gossip

var g = newGossipManager()
g.addNode("node1")
g.addNode("node2")
g.tick()  # Membership-Info austauschen

Distributed Transactions

Two-Phase Commit über Knoten:

import barabadb/core/disttxn

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

Formale Verifikation

Kern-Algorithmen für Distributed Systems sind formal in TLA+ spezifiziert und model-gecheckt:

Raft Consensus — formal-verification/raft.tla
- Verifiziert: ElectionSafety, StateMachineSafety
Two-Phase Commit — formal-verification/twopc.tla
- Verifiziert: Atomicity, NoOrphanBlocks
Replication — formal-verification/replication.tla
- Verifiziert: MonotonicLsn, AcksRemovePending

TLC lokal ausführen:

cd formal-verification
java -cp tla2tools.jar tlc2.TLC -config models/raft.cfg raft.tla
java -cp tla2tools.jar tlc2.TLC -config models/twopc.cfg twopc.tla
java -cp tla2tools.jar tlc2.TLC -config models/replication.cfg replication.tla

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