{"record":{"id":"56cf2d5d2b361cbb","repo":"influxdata/influxdb","slug":"error-writing-wal-file-0","errorCode":null,"errorMessage":"error writing wal file: {0}","messagePattern":"error writing wal file: (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"critical","filePath":"influxdb3_wal/src/lib.rs","lineNumber":40,"sourceCode":"use rustc_hash::FxHasher;\nuse serde::{Deserialize, Serialize};\nuse serde_with::serde_as;\nuse std::cmp::Ordering;\nuse std::fmt::Debug;\nuse std::hash::BuildHasherDefault;\nuse std::str::FromStr;\nuse std::sync::Arc;\nuse std::time::Duration;\nuse std::{any::Any, num::ParseIntError};\nuse thiserror::Error;\nuse tokio::sync::{OwnedSemaphorePermit, oneshot};\n\n#[derive(Debug, Error)]\npub enum Error {\n    #[error(\"wal buffer full with {0} ops\")]\n    BufferFull(usize),\n\n    #[error(\"error writing wal file: {0}\")]\n    WriteError(String),\n\n    #[error(\"deserialize error: {0}\")]\n    Serialize(#[from] crate::serialize::Error),\n\n    #[error(\"join error: {0}\")]\n    Join(#[from] tokio::task::JoinError),\n\n    #[error(\"object store error: {0}\")]\n    ObjectStoreError(#[from] ::object_store::Error),\n\n    #[error(\"wal is shutdown and not accepting writes\")]\n    Shutdown,\n\n    #[error(\"invalid gen1 duration {0}. Must be one of 1m, 5m, 10m\")]\n    InvalidGen1Duration(String),\n\n    #[error(\"invalid WAL file path\")]","sourceCodeStart":22,"sourceCodeEnd":58,"githubUrl":"https://github.com/influxdata/influxdb/blob/06200ef96ba82c5f6727e5038a83af8e722c6875/influxdb3_wal/src/lib.rs#L22-L58","documentation":"Error::WriteError in influxdb3_wal wraps a failure to write to a WAL file. The underlying message is carried as a String. It indicates the durable append to the write-ahead log failed, which means writes could not be persisted.","triggerScenarios":"The WAL writer's file append fails — disk I/O error, no space left on device, closed/rotated file handle — and the error is reported as a formatted string into Error::WriteError.","commonSituations":"Disk full (ENOSPC), permissions changed on the WAL directory, NFS/storage failures, container volume remounted read-only.","solutions":["Check disk space and free capacity on the WAL volume (ENOSPC is the most common cause)","Verify filesystem permissions on the WAL directory","Inspect the inner message for the OS-level cause and remediate storage, then restart writes"],"exampleFix":null,"handlingStrategy":"retry","validationCode":"// before writes: check writable & free space\nlet stat = fs2::free_space(&wal_dir)?;\nif stat < min_free_bytes { return Err(\"WAL volume low on space\".into()); }","typeGuard":null,"tryCatchPattern":"match result {\n    Ok(v) => v,\n    Err(Error::WriteError(msg)) => { log::error!(\"WAL write failed: {}\", msg); /* halt writes, alert operator */ },\n    Err(e) => return Err(e),\n}","preventionTips":["Monitor WAL disk free space with alerts","Ensure correct permissions on WAL directory provisioning","Avoid network filesystems for WAL storage"],"tags":["wal","io","filesystem","rust"],"backgroundTag":"file-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"}