The main advantage you get from offline shard reconfiguration is that you can do more than merely add or remove shards from your cluster. When you reshard offline, in addition to changing the number of shards in your cluster, you can do the following:
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Change the node type of your cluster.
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Upgrade to a newer engine version.
Note
Offline resharding is not supported on clusters with data tiering enabled. For more information, see Data tiering..
The main disadvantage of offline shard reconfiguration is that your cluster is offline beginning with the restore portion of the process and continuing until you update the endpoints in your application. The length of time that your cluster is offline varies with the amount of data in your cluster.
To reconfigure your shards MemoryDB cluster offline
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Create a manual snapshot of your existing MemoryDB cluster. For more information, see Making manual snapshots.
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Create a new cluster by restoring from the snapshot. For more information, see Restoring from a snapshot.
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Update the endpoints in your application to the new cluster's endpoints. For more information, see Finding connection endpoints.
