influxdata/influxdb · error · Error

io error

Error message

io error: {0}

What it means

This variant wraps std::io::Error raised anywhere in the server's request or lifecycle handling, converted automatically with #[from]. It covers filesystem I/O (loading certificates, reading config files, WAL interactions surfaced at the server layer) and network socket I/O (accepting TCP connections,读写 during request serving). The underlying OS error message follows 'io error: '.

Solutions

1. Read the inner OS error to distinguish file-system vs socket causes
2. Verify TLS cert/key file paths exist and are readable by the server process
3. Check file descriptor limits (ulimit -n) and raise them if connections fail under load
4. Confirm the bind address/port is correct and the process has permission to bind it
5. Check disk space and mount health for WAL/data directories

Example fix

// before: unreadable cert path
--tls-cert /etc/ssl/missing.crt
// after: verify file exists and is readable before start
ls -l /etc/ssl/influxdb.crt && influxdb3 serve --tls-cert /etc/ssl/influxdb.crt

fn check_tls_paths(cert: &str, key: &str) -> std::io::Result<()> {
    std::fs::File::open(cert)?;
    std::fs::File::open(key)?;
    Ok(())
}

fn is_io_error(e: &influxdb3_server::Error) -> Option<&std::io::Error> {
    match e { influxdb3_server::Error::Io(io) => Some(io), _ => None }
}

match server_result {
    Err(influxdb3_server::Error::Io(io)) => match io.kind() {
        std::io::ErrorKind::NotFound => eprintln!("file missing: {io}"),
        std::io::ErrorKind::PermissionDenied => eprintln!("permissions: {io}"),
        _ => eprintln!("io: {io}"),
    },
    Err(e) => eprintln!("server error: {e}"),
    Ok(v) => handle(v),
}

When it happens

Trigger: TCP listener accept failure while serving HTTP/gRPC; TLS certificate/key file read failures during server startup; socket errors while reading or writing an HTTP connection; any filesystem operation in the server path returning Err(io::Error).

Common situations: Providing a wrong path for --tls-cert/--tls-key so the cert file cannot be read; running out of file descriptors under load; port permission issues; client disconnecting mid-request producing a reset; disk full during WAL append.

Understand the failure class

Background: "failed to read file", EACCES, ENOENT and "could not read <path>" errors: when a program can't read a file from disk — this error's family across 49 libraries.

Related errors

• error from wal
• error writing wal file
• Failed to list object store metadata
• Failed to list table index snapshots from object store
• Failed to load table index conversion marker bytes from…

AI-assisted analysis of influxdata/influxdb@06200ef96b (2026-09-19). Data as JSON: /api/errors/7fef0ff61a5500ab. Report an issue: GitHub.

Appendix: source

Thrown at influxdb3_server/src/lib.rs:81

    #[error("hyper error: {0}")]
    Hyper(#[from] hyper::Error),

    #[error("http error: {0}")]
    Http(#[from] Box<http::Error>),

    #[error("database not found {db_name}")]
    DatabaseNotFound { db_name: String },

    #[error("datafusion error: {0}")]
    DataFusion(#[from] datafusion::error::DataFusionError),

    #[error("influxdb3_write error: {0}")]
    InfluxDB3Write(#[from] influxdb3_write::Error),

    #[error("from hex error: {0}")]
    FromHex(#[from] hex::FromHexError),

    #[error("io error: {0}")]
    Io(#[from] std::io::Error),

    #[error("tls config error: {0}")]
    TlsConfig(String),

    #[error("rustls error: {0}")]
    Rustls(#[from] rustls::Error),
}

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

#[derive(Debug, Clone)]
pub struct CommonServerState {
    catalog: Arc<Catalog>,
    metrics: Arc<metric::Registry>,
    trace_exporter: Option<Arc<trace_exporters::export::AsyncExporter>>,
    trace_header_parser: TraceHeaderParser,
    telemetry_store: Arc<TelemetryStore>,

View on GitHub (pinned to 06200ef96b)