<!--#include virtual="../includes/_header.htm" -->
<h2>Migrating from 0.7.x to 0.8</h2>

0.8 is our first (and hopefully last) release with a non-backwards-compatible wire protocol, zookeeper layout, and on-disk data format. This was a chance for us to clean up a lot of cruft and start fresh. This means performing a no-downtime upgrade is more painful than normal&mdash;you cannot just swap in the new code in-place.

<h3>Migration Steps</h3>

<ol>
	<li>Setup a new cluster running 0.8.
	<li>Use the 0.7 to 0.8 <a href="tools.html">migration tool</a> to mirror data from the 0.7 cluster into the 0.8 cluster.
	<li>When the 0.8 cluster is fully caught up, redeploy all data <i>consumers</i> running the 0.8 client and reading from the 0.8 cluster.
	<li>Finally migrate all 0.7 producers to 0.8 client publishing data to the 0.8 cluster.
	<li>Decomission the 0.7 cluster.
	<li>Drink.
</ol>

<!--#include virtual="../includes/_footer.htm" -->