Jdbc catalog the connection limit is due to 10 by default. You need to modify the maximum number of connections in the connection pool or rebuild the catalog plus this parameter: alter catalog <catalog_name> set properties ('connection_pool_max_size' = '100')

For details, please refer to the Doris doc post: https://doris.apache.org/docs/lakehouse/database/jdbc?_highlight=connection_pool_max_size#connection-pool-properties