influxdata/influxdb · error · Error

error from wal

Error message

error from wal: {0}

What it means

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.

Solutions

1. Inspect the inner influxdb3_wal::Error for the root cause
2. Check disk space and permissions on the WAL directory
3. Repair or move corrupted WAL segments and restart
4. Re-attempt the write once the WAL subsystem is healthy

// before writing: check WAL volume has space and is writable
let stat = fs::metadata(&wal_dir)?;
let free = free_space(&wal_dir)?;
if free < MIN_WAL_FREE_BYTES { return Err("WAL disk nearly full"); }

fn is_wal_error(err: &WriteBufferError) -> bool {
    matches!(err, WriteBufferError::WalError(_))
}

match buffer.write(db, lines) {
    Err(WriteBufferError::WalError(wal)) => {
        eprintln!("WAL failure: {wal}; check disk space/permissions");
    }
    other => other?,
}

When it happens

Trigger: Writing data when the WAL append fails — disk full, WAL directory unwritable, WAL file corruption, or I/O errors during segment flush.

Common situations: Disk exhaustion on the WAL volume; permission problems on the WAL directory after container redeploy; corrupted WAL segment after an unclean shutdown.

Related errors

• Failed to persist table index to object store
• error writing wal file
• io error
• IO error
• persister error

AI-assisted analysis of influxdata/influxdb@06200ef96b (2026-09-19). Data as JSON: /api/errors/c8789121ed786d57. Report an issue: GitHub.

Appendix: source

Thrown at influxdb3_write/src/write_buffer/mod.rs:134

    #[error("tried accessing table that do not exist")]
    TableDoesNotExist,

    #[error("table '{db_name}.{table_name}' already exists")]
    TableAlreadyExists {
        db_name: Arc<str>,
        table_name: Arc<str>,
    },

    #[error("tried accessing column with name ({0}) that does not exist")]
    ColumnDoesNotExist(String),

    #[error(
        "updating catalog on delete of last cache failed, you will need to delete the cache \
        again on server restart"
    )]
    DeleteLastCache(#[source] CatalogError),

    #[error("error from wal: {0}")]
    WalError(#[from] influxdb3_wal::Error),

    #[error("error in distinct value cache: {0}")]
    DistinctCacheError(#[from] distinct_cache::ProviderError),

    #[error("cannot write to a compactor-only server")]
    NoWriteInCompactorOnly,

    #[error("error: {0}")]
    AnyhowError(#[from] anyhow::Error),

    #[error("write not allowed on internal database")]
    InternalDbWriteNotAllowed,
}

pub type Result<T, E = Error> = std::result::Result<T, E>;

#[derive(Debug)]

View on GitHub (pinned to 06200ef96b)