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@@ -178,4 +178,10 @@ In the unlikely case of a network malfunction during the upgrade process that
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isolates all remaining old nodes from the cluster, you must take the
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old nodes offline and upgrade them to enable them to join the cluster.
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+Similarly, if you run a testing/development environment with only one master
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+node, the master node should be upgraded last. Restarting a single master node
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+forces the cluster to be reformed. The new cluster will initially only have the
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+upgraded master node and will thus reject the older nodes when they re-join the
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+cluster. Nodes that have already been upgraded will successfully re-join the
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+upgraded master.
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====================================================
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Boaz Leskes