> For the complete documentation index, see [llms.txt](https://docs.lenses.io/latest/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lenses.io/latest/k2k/readme.md).

# README

Lenses K2K is an application that allows you to replicate Kafka topics from one Kafka cluster to another.

{% hint style="info" %}
**K2K is generally available.** See [Releases and compatibility](https://github.com/lensesio-dev/k2k-documentation/tree/release/2.1.0/.gitbook/includes/install/releases-and-compatibility.md) for supported versions and upgrade guidance.
{% endhint %}

## Feedback

{% hint style="success" %}
Found an issue? Feed it back to us at [Github](https://github.com/orgs/lensesio/discussions), on [Slack](https://www.launchpass.com/lensesio), [Ask Marios](https://ask.lenses.io/) or [email](mailto:info@lenses.io).
{% endhint %}

{% hint style="warning" %}
To execute K2K, you must agree to the EULA and secure a free license.

Accept the EULA by setting `license.acceptEula` to `true` .
{% endhint %}

K2K (Kafka-to-Kafka) is a modern, standalone data replication engine for any Kafka API compatible implementation, designed for asynchronously replicating data between Apache Kafka clusters. It provides a robust and configurable pipeline to continuously mirror records, schemas, and topic configurations from a source cluster to a target cluster.

K2K ships as two applications — a **replicator** (`k2k`) and an optional **offset mapper** (`k2k-offset-mapping`) — configured through a single YAML pipeline file. The replicator copies records between clusters; the offset mapper translates consumer group positions so applications can fail over without reprocessing from the beginning. When offset mapping is enabled, both must be deployed. For administration tasks, use **k2k-tool** (CLI and web UI). See [Glossary](/latest/k2k/glossary.md) for naming conventions.

## Getting started

1. [Use cases](/latest/k2k/use-cases.md) — pick your scenario (DR, migration, staging)
2. [Architecture](/latest/k2k/architecture.md) — understand the two applications and pipeline file
3. [Minimal Configuration](/latest/k2k/minimal-configuration.md) — write your first pipeline
4. [Deployment](/latest/k2k/deployment.md) — deploy with Docker or Helm and start the replicator
5. [Configuration Reference](/latest/k2k/configuration-reference.md) — configure features and tune performance

For how K2K behaves under load and how it scales, see [Performance](/latest/k2k/performance.md). For operational procedures, see [Runbooks](/latest/k2k/runbooks.md).

For operational procedures, see [Runbooks](/latest/k2k/runbooks.md).


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