TherChenYang commented on issue #31242:
URL: 
https://github.com/apache/shardingsphere/issues/31242#issuecomment-2121560176

   @ttfont Are you using the ShardingSphere-JDBC or ShardingSphere-Proxy? If it 
is the JDBC module, ShardingSphere is not responsible for data migration. You 
need to use a data migration tool to complete the migration of your 16 shards 
to 32 shards. During the migration process, for both old and new clusters, you 
need to perform dual write operations by reading data from the old cluster (16 
shards). Once the overall migration process is completed, change 
ShardingSphere's configuration so that both read and write operations are 
routed to the new cluster.


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