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@@ -2,6 +2,10 @@
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etcd comes with support for incremental runtime reconfiguration, which allows users to update the membership of the cluster at run time.
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+Reconfiguration requests can only be processed when the the majority of the cluster members are functioning. It is **highly recommended** to always have a cluster size greater than two in production. It is unsafe to remove a member from a two member cluster. The majority of a two member cluster is also two. If there is a failure during the removal process, the cluster might not able to make progress and need to [restart from majority failure][majority failure].
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+[majority failure]: #restart-cluster-from-majority-failure
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## Reconfiguration Use Cases
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Let us walk through the four use cases for re-configuring a cluster: replacing a member, increasing or decreasing cluster size, and restarting a cluster from a majority failure.
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Xiang Li