influxdata/influxdb · warning · Error

incoming write was empty

Error message

incoming write was empty

What it means

write_buffer::Error::EmptyWrite is returned when an incoming write request contains no data — an empty line-protocol payload or zero points. The write buffer rejects it rather than performing a no-op, so callers can detect client-side bugs (e.g. serialization producing empty output).

Solutions

1. Check the payload at the call site — if it is empty, skip the write instead of issuing the request.
2. Instrument the upstream producer to alert when it generates zero points for a batch.
3. If empty writes should be legal no-ops in your integration, guard the call before invoking the buffer.
4. Fix serialization bugs that drop all points (e.g. wrong field names so the encoder emits nothing).

Example fix

// before
buffer.write_lp(payload).await?;
// after
if !payload.trim().is_empty() {
  buffer.write_lp(payload).await?;
}

// Rust: guard before calling the write buffer
if payload.trim().is_empty() {
  return Ok(WriteSummary::empty()); // no-op instead of an error round-trip
}

fn is_empty_write(e: &write_buffer::Error) -> bool {
  matches!(e, write_buffer::Error::EmptyWrite)
}

match buffer.write_lp(payload).await {
  Err(write_buffer::Error::EmptyWrite) => {
    debug!("empty batch skipped");
    Ok(default_ack)
  }
  other => other,
}

When it happens

Trigger: Calling write_lp / write APIs with an empty string, a string containing only newlines/whitespace, or a points list that serialized to nothing.

Common situations: Data-collection pipeline upstream failing silently so the exporter sends empty batches; client serializing an empty Vec<Point> to an empty body; trimming/aggregation logic that filters out all points; misconfigured buffer flush sending an empty payload on shutdown.

Understand the failure class

Background: "must not be empty", "cannot be empty" — required-field validation errors across open-source libraries — this error's family across 41 libraries.

Related errors

• cannot use a column of type
• Cannot write
• cannot write to soft-deleted database
• column ' ' ( ) is not defined in table ' ' of database ' '…
• column type mismatch for column

AI-assisted analysis of influxdata/influxdb@06200ef96b (2026-09-19). Data as JSON: /api/errors/302e97c466462db3. Report an issue: GitHub.

Appendix: source

Thrown at influxdb3_write/src/write_buffer/mod.rs:73

use object_store::{ObjectMeta, ObjectStore, path::Path as ObjPath};
use observability_deps::tracing::{debug, info, trace, warn};
use parquet_file::storage::DataSourceExecInput;
use queryable_buffer::QueryableBufferArgs;
use schema::Schema;
use std::{
    borrow::Borrow,
    num::{NonZeroU64, NonZeroUsize},
    sync::Arc,
    time::Duration,
};
use thiserror::Error;

#[derive(Debug, Error)]
pub enum Error {
    #[error("line protocol parse failed: {}", .0.error_message)]
    ParseError(WriteLineError),

    #[error("incoming write was empty")]
    EmptyWrite,

    #[error("column type mismatch for column {name}: existing: {existing:?}, new: {new:?}")]
    ColumnTypeMismatch {
        name: String,
        existing: ColumnType,
        new: ColumnType,
    },

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

    #[error("error from persister: {0}")]
    PersisterError(#[from] PersisterError),

    #[error("corrupt load state: {0}")]
    CorruptLoadState(String),

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