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Defines the size of the intermediate buffer used when transferring data during a local cloning operation. The default value is 4 mebibytes (MiB). A larger buffer size may permit I/O device drivers to fetch data in parallel, which can improve cloning performance. 

• clone_ddl_timeout 

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The time in seconds to wait for a backup lock when executing a cloning operation. This setting is applied on both the donor and recipient MySQL server instances. A cloning operation cannot run concurrently with DDL operations. A backup lock is required on the donor and recipient MySQL server instances. The cloning operation waits for current DDL operations to finish. Once backup locks are acquired, DDL operations must wait for the cloning operation to finish. A value of 0 means that no backup lock is to be taken for the cloning operation. In this case, the cloning operation fails with an error if a DDL operation is attempted concurrently. 

• clone_donor_timeout_after_network_failure 

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