35 lines
1.9 KiB
HTML
35 lines
1.9 KiB
HTML
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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limitations under the License.
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<!--#include virtual="../includes/_header.htm" -->
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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>
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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 class="anchor-heading"><a id="migration_steps" class="anchor-link"></a><a href="#migration_steps">Migration Steps</a></h3>
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<ol>
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<li>Setup a new cluster running 0.8.
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<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.
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<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.
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<li>Finally migrate all 0.7 producers to 0.8 client publishing data to the 0.8 cluster.
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<li>Decommission the 0.7 cluster.
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<li>Drink.
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</ol>
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