{
  "code": null,
  "collection": "architecture",
  "href": "https://banes-lab.com/ontology#architecture-lost-update",
  "id": "lost-update",
  "kind": "anti-pattern",
  "layer": {
    "href": "https://banes-lab.com/ontology/schema#layer-enforcement-core",
    "json": "https://banes-lab.com/json/records/layer/enforcement-core",
    "label": "Enforcement Core",
    "markdown": "https://banes-lab.com/records/layer/enforcement-core.md",
    "ref": "layer:enforcement-core"
  },
  "name": "Lost Update",
  "ref": "architecture:lost-update",
  "relations": [
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-optimistic-locking",
          "json": "https://banes-lab.com/json/records/architecture/optimistic-locking",
          "label": "Optimistic Locking",
          "markdown": "https://banes-lab.com/records/architecture/optimistic-locking.md",
          "ref": "architecture:optimistic-locking"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-pessimistic-locking",
          "json": "https://banes-lab.com/json/records/architecture/pessimistic-locking",
          "label": "Pessimistic Locking",
          "markdown": "https://banes-lab.com/records/architecture/pessimistic-locking.md",
          "ref": "architecture:pessimistic-locking"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-merge-policy",
          "json": "https://banes-lab.com/json/records/lexicon/merge-policy",
          "label": "Merge Policy",
          "markdown": "https://banes-lab.com/records/lexicon/merge-policy.md",
          "ref": "lexicon:merge-policy"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-transaction-isolation-level",
          "json": "https://banes-lab.com/json/records/lexicon/transaction-isolation-level",
          "label": "Transaction Isolation Level",
          "markdown": "https://banes-lab.com/records/lexicon/transaction-isolation-level.md",
          "ref": "lexicon:transaction-isolation-level"
        }
      ],
      "relation": "refactored-by"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/schema#vocabulary-severity-discouraged",
          "json": "https://banes-lab.com/json/records/vocabulary/severity-discouraged",
          "label": "discouraged",
          "markdown": "https://banes-lab.com/records/vocabulary/severity-discouraged.md",
          "ref": "vocabulary:severity-discouraged"
        }
      ],
      "relation": "severity"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-category-anti-patterns",
          "json": "https://banes-lab.com/json/records/architecture-category/anti-patterns",
          "label": "Anti-patterns",
          "markdown": "https://banes-lab.com/records/architecture-category/anti-patterns.md",
          "ref": "architecture-category:anti-patterns"
        }
      ],
      "relation": "category"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/schema#force-state-transaction",
          "json": "https://banes-lab.com/json/records/force/state-transaction",
          "label": "State transaction",
          "markdown": "https://banes-lab.com/records/force/state-transaction.md",
          "ref": "force:state-transaction"
        }
      ],
      "relation": "force"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-vector-clocks",
          "json": "https://banes-lab.com/json/records/architecture/vector-clocks",
          "label": "Vector Clocks",
          "markdown": "https://banes-lab.com/records/architecture/vector-clocks.md",
          "ref": "architecture:vector-clocks"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-crdts",
          "json": "https://banes-lab.com/json/records/architecture/crdts",
          "label": "CRDTs",
          "markdown": "https://banes-lab.com/records/architecture/crdts.md",
          "ref": "architecture:crdts"
        }
      ],
      "relation": "violates"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-write-barrier",
          "json": "https://banes-lab.com/json/records/architecture/write-barrier",
          "label": "Write Barrier",
          "markdown": "https://banes-lab.com/records/architecture/write-barrier.md",
          "ref": "architecture:write-barrier"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-concurrency-control",
          "json": "https://banes-lab.com/json/records/architecture/concurrency-control",
          "label": "Concurrency Control",
          "markdown": "https://banes-lab.com/records/architecture/concurrency-control.md",
          "ref": "architecture:concurrency-control"
        }
      ],
      "relation": "negated-by"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/pag/orchestration#shared-surfaces",
          "json": "https://banes-lab.com/json/pag/orchestration/shared-surfaces",
          "label": "Shared surfaces",
          "markdown": "https://banes-lab.com/pag/orchestration/shared-surfaces.md",
          "ref": "chapter:/pag/orchestration#shared-surfaces"
        },
        {
          "href": "https://banes-lab.com/disciplined-methodology/collaborate#coordination-is-software",
          "json": "https://banes-lab.com/json/disciplined-methodology/collaborate/coordination-is-software",
          "label": "Coordination is software",
          "markdown": "https://banes-lab.com/disciplined-methodology/collaborate/coordination-is-software.md",
          "ref": "chapter:/disciplined-methodology/collaborate#coordination-is-software"
        },
        {
          "href": "https://banes-lab.com/software-architecture/decay#seven-controls-seven-classes",
          "json": "https://banes-lab.com/json/software-architecture/decay/seven-controls-seven-classes",
          "label": "Seven controls, seven classes",
          "markdown": "https://banes-lab.com/software-architecture/decay/seven-controls-seven-classes.md",
          "ref": "chapter:/software-architecture/decay#seven-controls-seven-classes"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-category-anti-patterns",
          "json": "https://banes-lab.com/json/ontology/principles/architecture-category-anti-patterns",
          "label": "Anti-patterns",
          "markdown": "https://banes-lab.com/ontology/principles/architecture-category-anti-patterns.md",
          "ref": "chapter:/ontology#architecture-category-anti-patterns"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-category-causality-ordering-distributed-time",
          "json": "https://banes-lab.com/json/ontology/principles/architecture-category-causality-ordering-distributed-time",
          "label": "Causality / Ordering / Distributed Time",
          "markdown": "https://banes-lab.com/ontology/principles/architecture-category-causality-ordering-distributed-time.md",
          "ref": "chapter:/ontology#architecture-category-causality-ordering-distributed-time"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-category-coordination-surfaces",
          "json": "https://banes-lab.com/json/ontology/principles/architecture-category-coordination-surfaces",
          "label": "Coordination Surfaces",
          "markdown": "https://banes-lab.com/ontology/principles/architecture-category-coordination-surfaces.md",
          "ref": "chapter:/ontology#architecture-category-coordination-surfaces"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-category-transactions-state-concurrency",
          "json": "https://banes-lab.com/json/ontology/principles/architecture-category-transactions-state-concurrency",
          "label": "Transactions / State / Concurrency",
          "markdown": "https://banes-lab.com/ontology/principles/architecture-category-transactions-state-concurrency.md",
          "ref": "chapter:/ontology#architecture-category-transactions-state-concurrency"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-category-core-vocabulary",
          "json": "https://banes-lab.com/json/ontology/lexicon/lexicon-category-core-vocabulary",
          "label": "Core Vocabulary",
          "markdown": "https://banes-lab.com/ontology/lexicon/lexicon-category-core-vocabulary.md",
          "ref": "chapter:/ontology/lexicon#lexicon-category-core-vocabulary"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-category-transactions-state-concurrency",
          "json": "https://banes-lab.com/json/ontology/lexicon/lexicon-category-transactions-state-concurrency",
          "label": "Transactions / State / Concurrency",
          "markdown": "https://banes-lab.com/ontology/lexicon/lexicon-category-transactions-state-concurrency.md",
          "ref": "chapter:/ontology/lexicon#lexicon-category-transactions-state-concurrency"
        },
        {
          "href": "https://banes-lab.com/ontology/schema#the-vocabulary-severity",
          "json": "https://banes-lab.com/json/ontology/schema/the-vocabulary-severity",
          "label": "Severity levels",
          "markdown": "https://banes-lab.com/ontology/schema/the-vocabulary-severity.md",
          "ref": "chapter:/ontology/schema#the-vocabulary-severity"
        },
        {
          "href": "https://banes-lab.com/ontology/schema#the-forces",
          "json": "https://banes-lab.com/json/ontology/schema/the-forces",
          "label": "The forces",
          "markdown": "https://banes-lab.com/ontology/schema/the-forces.md",
          "ref": "chapter:/ontology/schema#the-forces"
        }
      ],
      "relation": "linked-from"
    }
  ],
  "summary": "A defect in which concurrent writers overwrite each other's changes without a version check.",
  "siblings": {
    "next": {
      "href": "https://banes-lab.com/ontology#architecture-dual-write",
      "json": "https://banes-lab.com/json/records/architecture/dual-write",
      "label": "Dual Write",
      "markdown": "https://banes-lab.com/records/architecture/dual-write.md",
      "ref": "architecture:dual-write"
    },
    "previous": {
      "href": "https://banes-lab.com/ontology#architecture-silent-data-corruption",
      "json": "https://banes-lab.com/json/records/architecture/silent-data-corruption",
      "label": "Silent Data Corruption",
      "markdown": "https://banes-lab.com/records/architecture/silent-data-corruption.md",
      "ref": "architecture:silent-data-corruption"
    }
  },
  "up": {
    "href": null,
    "json": "https://banes-lab.com/json/api/records/architecture",
    "label": "Architecture principles",
    "markdown": "https://banes-lab.com/api/records/architecture.md",
    "ref": "api:records/architecture"
  },
  "aliases": [
    "Whole-File Write Race"
  ],
  "exemplar": {
    "after": "await fooStore.update(id, { count: increment(1) }, { expectedVersion: foo.version });",
    "before": "const foo = await load(id);\nfoo.count += 1;\nawait save(foo);",
    "lang": "ts",
    "medium": "code"
  },
  "formedBy": "Allow concurrent writers to overwrite each other without version checks, locks, compare-and-swap, or transaction isolation.",
  "scope": [
    "state_transaction"
  ],
  "severity": "discouraged"
}