ivankelly commented on a change in pull request #2048: Add Upgrade Guide to 
Apache Pulsar
URL: https://github.com/apache/incubator-pulsar/pull/2048#discussion_r201618522

 File path: site/docs/latest/admin/Upgrade.md
 @@ -0,0 +1,152 @@
+title: Upgrade
+    Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+      http://www.apache.org/licenses/LICENSE-2.0
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+> If you have questions about upgrades (or need help), please feel free to 
reach out to us by [mailing list]({{ site.baseurl }}/contact) or [Slack 
Channel]({{ site.baseurl }}/contact).
+## Overview
+Consider the below guidelines in preparation for upgrading.
+- Always back up all your configuration files before upgrading.
+- Read through the documentation and draft an upgrade plan that matches your 
specific requirements and environment before starting the upgrade process.
+    Put differently, don't start working through the guide on a live cluster. 
Read guide entirely, make a plan, then execute the plan.
+- Pay careful consideration to the order in which components are upgraded. In 
general, you need to upgrade bookies first, upgrade brokers next and then 
upgrade your clients.
 Review comment:
   Remove "In general".
   What about configuration store? zookeeper? proxies?

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