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| <h2 class="anchor-heading"><a id="migration" class="anchor-link"></a><a href="#migration">Migrating from 0.7.x to 0.8</a></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—you cannot just swap in the new code in-place. |
| |
| <h3 class="anchor-heading"><a id="migration_steps" class="anchor-link"></a><a href="#migration_steps">Migration Steps</a></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>Decommission the 0.7 cluster. |
| <li>Drink. |
| </ol> |
| |
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