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| <h2>Migrating from 0.7.x to 0.8</h2> |
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| 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—you cannot just swap in the new code in-place. |
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| <h3>Migration Steps</h3> |
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| <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> |
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