{"record":{"id":"c8789121ed786d57","repo":"influxdata/influxdb","slug":"error-from-wal-0","errorCode":null,"errorMessage":"error from wal: {0}","messagePattern":"error from wal: (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"influxdb3_write/src/write_buffer/mod.rs","lineNumber":134,"sourceCode":"    #[error(\"tried accessing table that do not exist\")]\n    TableDoesNotExist,\n\n    #[error(\"table '{db_name}.{table_name}' already exists\")]\n    TableAlreadyExists {\n        db_name: Arc<str>,\n        table_name: Arc<str>,\n    },\n\n    #[error(\"tried accessing column with name ({0}) that does not exist\")]\n    ColumnDoesNotExist(String),\n\n    #[error(\n        \"updating catalog on delete of last cache failed, you will need to delete the cache \\\n        again on server restart\"\n    )]\n    DeleteLastCache(#[source] CatalogError),\n\n    #[error(\"error from wal: {0}\")]\n    WalError(#[from] influxdb3_wal::Error),\n\n    #[error(\"error in distinct value cache: {0}\")]\n    DistinctCacheError(#[from] distinct_cache::ProviderError),\n\n    #[error(\"cannot write to a compactor-only server\")]\n    NoWriteInCompactorOnly,\n\n    #[error(\"error: {0}\")]\n    AnyhowError(#[from] anyhow::Error),\n\n    #[error(\"write not allowed on internal database\")]\n    InternalDbWriteNotAllowed,\n}\n\npub type Result<T, E = Error> = std::result::Result<T, E>;\n\n#[derive(Debug)]","sourceCodeStart":116,"sourceCodeEnd":152,"githubUrl":"https://github.com/influxdata/influxdb/blob/06200ef96ba82c5f6727e5038a83af8e722c6875/influxdb3_write/src/write_buffer/mod.rs#L116-L152","documentation":"A transparent wrapper (#[from]) around influxdb3_wal::Error. Any failure in the Write-Ahead Log subsystem (e.g. appending, flushing, or persisting WAL segments) is surfaced through this variant. It indicates the write pipeline could not durably record the operation in the WAL.","triggerScenarios":"Writing data when the WAL append fails — disk full, WAL directory unwritable, WAL file corruption, or I/O errors during segment flush.","commonSituations":"Disk exhaustion on the WAL volume; permission problems on the WAL directory after container redeploy; corrupted WAL segment after an unclean shutdown.","solutions":["Inspect the inner influxdb3_wal::Error for the root cause","Check disk space and permissions on the WAL directory","Repair or move corrupted WAL segments and restart","Re-attempt the write once the WAL subsystem is healthy"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// before writing: check WAL volume has space and is writable\nlet stat = fs::metadata(&wal_dir)?;\nlet free = free_space(&wal_dir)?;\nif free < MIN_WAL_FREE_BYTES { return Err(\"WAL disk nearly full\"); }","typeGuard":"fn is_wal_error(err: &WriteBufferError) -> bool {\n    matches!(err, WriteBufferError::WalError(_))\n}","tryCatchPattern":"match buffer.write(db, lines) {\n    Err(WriteBufferError::WalError(wal)) => {\n        eprintln!(\"WAL failure: {wal}; check disk space/permissions\");\n    }\n    other => other?,\n}","preventionTips":["Monitor WAL disk usage and alert before exhaustion","Keep WAL directory permissions stable across deploys","Handle unclean shutdowns by validating WAL segments on boot"],"tags":["wal","io","persistence","influxdb3"],"backgroundTag":"database-write-failed","analyzedSha":"06200ef96ba82c5f6727e5038a83af8e722c6875","analyzedAt":"2026-09-19T12:55:30.003Z","contentChangedAt":"2026-09-19T12:55:30.003Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}