{
  "slug": "read-repair",
  "term": "Read repair",
  "aliases": [],
  "definition": "Read repair reconciles divergent replicas as part of processing a read request.",
  "note": "When triggered, Cassandra 5.0.0 BLOCKING repairs queried data and waits for sufficient acknowledgements; NONE reconciles responses without repair writes. BLOCKING supports monotonic quorum reads, but a narrower read than write can expose partial partition updates. [read]",
  "status": "shipping",
  "advantages": [],
  "limitations": [
    {
      "text": "A read does not establish agreement for unqueried data or every replica.",
      "citationIds": [
        "read"
      ]
    }
  ],
  "related": [
    "anti-entropy-repair",
    "hinted-handoff",
    "monotonic-reads"
  ],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-13",
  "citations": [
    {
      "id": "read",
      "title": "Apache Cassandra 5.0.0: Read repair",
      "url": "https://raw.githubusercontent.com/apache/cassandra/cassandra-5.0.0/doc/modules/cassandra/pages/managing/operating/read_repair.adoc",
      "accessed": "2026-10-13"
    },
    {
      "id": "hesela-repair",
      "title": "Replica repair: what has actually converged?",
      "url": "https://hesela.com/analyses/replica-repair-coverage/",
      "accessed": "2026-10-13"
    }
  ]
}