influxdata/influxdb · error · ProcessingEngineError

wal error

Error message

wal error: {0}

What it means

ProcessingEngineError::WalError with #[from] influxdb3_wal::Error — automatic conversion of WAL-layer failures. Indicates the write-ahead log subsystem returned an error while the processing engine was performing work that touches the WAL (flushes, replay, trigger scheduling).

Solutions

1. Check the inner influxdb3_wal::Error message to identify the failing WAL file or operation.
2. Verify the WAL directory exists, is writable, and has free disk space.
3. Back up and inspect/repair corrupted WAL segments; do not delete them blindly.
4. Restart the node after fixing disk/permission issues so WAL replay can resume cleanly.

// preflight: WAL dir writable and has space
fs.accessSync(walDir, fs.constants.W_OK);
if (fs.statSync(walDir).sizeFreeHint < threshold) throw new Error('WAL disk low');

try {
  await runEngineOperation();
} catch (e) {
  if (String(e).startsWith('wal error')) {
    alertOps('WAL failure — check disk and WAL segment integrity');
  } else { throw e; }
}

When it happens

Trigger: Trigger processing or WAL replay paths where influxdb3_wal::Error occurs (WAL file corruption, flush failure, WAL directory inaccessible).

Common situations: Disk full on the WAL volume; corrupted/interrupted WAL segment after a crash; permission changes on the WAL directory; node restored from a partial snapshot.

Related errors

• catalog update error
• plugin error
• unexpectedly found request path trigger specification
• write buffer error
• {0}

AI-assisted analysis of influxdata/influxdb@06200ef96b (2026-09-19). Data as JSON: /api/errors/d1470819c56a5002. Report an issue: GitHub.

Appendix: source

Thrown at influxdb3_processing_engine/src/manager.rs:18

use crate::environment::PluginEnvironmentError;
use influxdb3_catalog::CatalogError;
use influxdb3_id::{DbId, TriggerId};
use std::fmt::Debug;
use thiserror::Error;

#[derive(Debug, Error)]
pub enum ProcessingEngineError {
    #[error("database not found: {0}")]
    DatabaseNotFound(String),

    #[error("catalog update error: {0}")]
    CatalogUpdateError(#[from] CatalogError),

    #[error("write buffer error: {0}")]
    WriteBufferError(#[from] influxdb3_write::write_buffer::Error),

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

    #[error("plugin error: {0}")]
    PluginError(#[from] crate::plugins::PluginError),

    #[error("processing engine trigger {trigger_id} not found in database {db_id}")]
    TriggerNotFound { db_id: DbId, trigger_id: TriggerId },

    #[error("request trigger not found")]
    RequestTriggerNotFound,

    #[error("request handler for trigger down")]
    RequestHandlerDown,

    #[error("error installing python packages: {0}")]
    PythonPackageError(PluginEnvironmentError),

    #[error("{0}")]

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