> ## Documentation Index
> Fetch the complete documentation index at: https://docs.goldsky.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Blackhole

> Discard data for testing and development purposes

## Overview

Discards all incoming records without writing anywhere. Useful for benchmarking source and transform throughput without sink I/O overhead, or for temporarily disabling output while iterating on transforms.

## Configuration

```yaml theme={null}
sinks:
  my_blackhole_sink:
    type: blackhole
    from: my_transform
```

## Parameters

<ParamField path="type" type="string" required>
  Must be `blackhole`
</ParamField>

<ParamField path="from" type="string" required>
  The transform or source to read data from
</ParamField>

## Use Cases

* **Performance Testing**: Measure transform performance without sink overhead
* **Pipeline Validation**: Test that data flows correctly without writing anywhere
* **Development**: Temporarily disable output while working on transforms

## Example

```yaml theme={null}
sinks:
  perf_test:
    type: blackhole
    from: complex_transform
```