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Cassandra: route coordinators to the configured datacenter

Aperta
  • Qualcosa non va?
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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
48/100
Tipo di issue
Bug
Chiarezza
Specificata chiaramente
Stato di attività
Attiva
Stack tecnologico
rust
Ambito
backend, databases

Direzione di ricerca

Read crates/storage-cassandra/src/engine.rs and the session builder in crates/storage-cassandra/src/lib.rs, then check how datacenter is exposed in crates/storage-cassandra/src/config.rs. The issue points to cdrs-tokio 9.0.2's topology-aware load balancing and node distance evaluator; verify their API and how they use the configured datacenter. Done means coordinators route to that datacenter and the described local consistency operations no longer fail when remote peers are discovered.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

backend:cassandra

Summary

The Cassandra backend creates every keyspace with NetworkTopologyStrategy in the one datacenter named by datacenter, and since #591 (the fix for #560) runs every data-path statement at LOCAL_QUORUM or LOCAL_ONE. The session uses RoundRobinLoadBalancingStrategy with the driver's default node distance evaluator, which treats every node the driver discovers from system.peers_v2 as local. A coordinator in a datacenter that holds no replica of the keyspace evaluates LOCAL_QUORUM and LOCAL_ONE against its own datacenter, finds no replica, and answers unavailable; the driver retries once on the next node and then fails the request.

Expected

Statements are coordinated by nodes in datacenter. cdrs-tokio 9.0.2 has TopologyAwareLoadBalancingStrategy and TopologyAwareNodeDistanceEvaluator::new(local_dc), which route to the local datacenter and treat remote nodes as remote.

Today

The datacenter field doc, the differences table, the high availability design and the upgrade manual tell the operator to run ExtendDB against contact points whose peers are all in datacenter. Before #591 the LOCAL_QUORUM batches, the query_lwt paths and the quorum reads already failed from such a coordinator; the reads, the OCC lightweight transactions and the plain delete succeeded at ONE.

Where

  • crates/storage-cassandra/src/engine.rs (RoundRobinLoadBalancingStrategy::new())
  • crates/storage-cassandra/src/lib.rs (the session builder)
  • crates/storage-cassandra/src/config.rs (datacenter)
Lingua principale
Rust
Stelle
517
Fork
60
Merge medio
2g 22h
PR unite (30g)
25

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