| <h3><a id="upgrade">1.5 Upgrading From Previous Versions</a></h3> |
| <h4>Upgrading from 0.8.0 to 0.8.1</h4> |
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| 0.8.1 is fully compatible with 0.8. The upgrade can be done one broker at a time by simply bringing it down, updating the code, and restarting it. |
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| <h4>Upgrading from 0.7</h4> |
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| 0.8, the release in which added replication, was our first backwards-incompatible release: major changes were made to the API, ZooKeeper data structures, and protocol, and configuration. The upgrade from 0.7 to 0.8.x requires a <a href="https://cwiki.apache.org/confluence/display/KAFKA/Migrating+from+0.7+to+0.8">special tool</a> for migration. This migration can be done without downtime. |
