Data migration method and apparatus

1. A data migration method comprising:

sending, by a first storage system, a location update request to a location server,

wherein the location update request prompts the location server to update location information of a first bucket in a migrated second storage system from a location in the second storage system to a second bucket at a location in a first storage system, and

wherein creation of the second bucket is based on metadata of the first bucket;

migrating, by the first storage system, data in the first bucket from the second storage system, and storing the data in the second bucket in the first storage system;

receiving, by the first storage system, a data download request used to access the data in the first bucket; and

determining, by the first storage system and based on a type of the data requested by the data download request and a migration status of the data, which one of the first storage system or the second storage system processes the data download request, wherein the determination includes

determining the type of the data requested by the data download request, wherein the type of the data is either metadata or not metadata,

determining that the migration status of the data requested by the download request is that the migration of the data has started but is not yet completed,

obtaining the requested data from the first bucket and sending the requested data to a client, based on determining that the type of the requested data is not metadata and the status of the migration is that the migration of the data has started but is not yet completed, and

obtaining the requested data from the second bucket and sending the requested data to the client, based on determining that the type of the requested data is metadata and the status of the migration is that the migration of the data has started but is not yet completed.

2. The data migration method according to claim 1 , wherein migrating the data in the first bucket from the second storage system comprises:

first migrating, by the first storage system, the metadata of an object in the first bucket, and then migrating remaining data other than the metadata in the first bucket.

3. The data migration method according to claim 1 , wherein receiving the data download request comprises:

receiving, by the first storage system, the data access download from the second storage system, wherein the data download request comprises an identifier of the first bucket.

4. The data migration method according to claim 1 , wherein receiving the data download request comprises:

receiving, by the first storage system, the data download request sent by a virtual host, wherein the data download request comprises an identifier of the first bucket.

5. The data migration method according to claim 1 , wherein obtaining the requested data from the second bucket and sending the requested data to the client, based on the type of the requested data being metadata and the status of the migration is the migration of the data has started but is not yet completed includes first sending the metadata to the client and then migrating data other than the metadata from the first bucket to the second bucket.

6. A first storage system comprising a processor and an interface, wherein the processor communicates with the interface, and the processor is configured to perform operations including:

sending a location update request to a location server,

wherein the location update request prompts the location server to update location information of a first bucket in a migrated second storage system from a location in the second storage system to a second bucket at a location in a first storage system, and

wherein creation of the second bucket is based on metadata of the first bucket;

migrating data in the first bucket from the second storage system, and storing the data in the second bucket in the first storage system;

receiving a data access request used to download the data in the first bucket; and

determining which one of the first storage system or the second storage system processes the data download request,

wherein the determination is based on a type of the data requested by the data download request and a migration status of the data and includes

determining the type of the data requested by the data download request, wherein the type of the data is either metadata or not metadata,

obtaining the data from the second bucket and sending the data to the client, based on determining that the migration status of the data requested by the download request is that the migration to the second bucket is complete,

obtaining the requested data from the first bucket and sending the requested data to a client, based on determining that the requested data is not metadata and the status of the migration is that the migration of the data has started but is not yet completed, and

obtaining the requested data from the second bucket and sending the requested data to the client, based on determining that the type of the requested data is metadata and the status of the migration is that the migration of the data has started but is not yet completed.

7. The storage system according to claim 6 , wherein the processor is further configured to perform operations including:

first migrating the metadata of an object in the first bucket, and then migrating remaining data other than the metadata in the first bucket.

8. The storage system according to claim 6 , wherein the processor is further configured to perform operations including:

receiving the data download request from the second storage system, wherein the data download request comprises an identifier of the first bucket.

9. The storage system according to claim 6 , wherein the processor is further configured to perform operations including:

receiving the data download request sent by a virtual host, wherein the data download request comprises an identifier of the first bucket.

10. The storage system according to claim 6 , wherein the processor operation of obtaining the requested data from the second bucket and sending the requested data to the client, based on the type of the requested data being metadata and the status of the migration is the migration of the data has started but is not yet completed includes:

first sending the metadata to the client and then migrating data other than the metadata from the first bucket to the second bucket.

11. A non-transitory computer storage medium storing one or more computer instructions and, when the one or more computer instructions is executed by a computer, the computer is caused to perform operations including:

sending a location update request to a location server,

wherein the location update request prompts the location server to update location information of a first bucket in a migrated second storage system from a location in the second storage system to a second bucket located in the first storage system, and

wherein creation of the second bucket is based on metadata of the first bucket;

migrating data in the first bucket from the second storage system, and storing the data in the second bucket in the first storage system;

receiving a data download request used to access the data in the first bucket; and

determining which one of the first storage system or the second storage system processes the data download request,

wherein the determination is based on a type of the data requested by the data download request and a migration status of the data and includes

determining the type of the data requested by the data download request, wherein the type of the data is either metadata or not metadata,

obtaining the data from the second bucket and sending the data to the client, based on determining that the migration status of the data requested by the download request is that the migration to the second bucket is complete,

obtaining the requested data from the first bucket and sending the requested data to a client, based on determining that the requested data is not metadata and the status of the migration is that the migration of the data has started but is not yet completed, and

obtaining the requested data from the second bucket and sending the requested data to the client, based on determining that the type of the requested data is metadata and the status of the migration is that the migration of the data has started but is not yet completed.

12. The non-transitory computer storage medium according to claim 11 , wherein the operations further include:

first migrating the metadata of an object in the first bucket, and then migrating remaining data other than the metadata in the first bucket.

13. The non-transitory computer storage medium according to claim 11 , wherein the operations further include:

receiving the data download request from the second storage system, wherein the data download request comprises an identifier of the first bucket.

14. The non-transitory computer storage medium according to claim 11 , wherein the operations further include:

receiving the data download request sent by a virtual host, wherein the data download request comprises an identifier of the first bucket.

15. The non-transitory computer storage medium according to claim 11 , wherein the operation of obtaining the requested data from the second bucket and sending the requested data to the client based on the type of the requested data being metadata and the status of the migration is the migration of the data has started but is not yet completed includes:

first sending the metadata to the client and then migrating data other than the metadata from the first bucket to the second bucket.