Abstract: Apparatuses and methods are disclosed for cluster switching. An exemplary method may include synchronizing original data on a first cluster to a second cluster after starting to switch clusters. A priority of the original data on the second cluster is set to a lower priority. The method may also include responding to a write operation request on the second cluster in the period of synchronizing the original data on the first cluster to the second cluster. A priority of new data corresponding to the write operation request is set to a higher priority. A version of data with a higher priority can overwrite another version of data. The method may further include responding to the write operation request on the second cluster after synchronizing the original data on the first cluster to the second cluster.

Abstract: The present application provides methods and devices for writing data and acquiring data in a distributed storage system. According to an exemplary method, in a process of writing data, a data file is not overwritten but is instead updated by making a copy in a newly allocated storage block and an updated description file is persisted by using an atomic operation. This way, in a process of appending data, it can be ensured that a data file is not damaged, and the readability and consistency of data are maintained, facilitating the use by a user. Further, writing data according to some embodiments of the present application supports a write in which a user specifies a write position of to-be-written data, and also supports a write in which the user does not specify a write position of to-be-written data, thereby improving the flexibility of writing data.

Abstract: The present application provides methods and devices for writing data and acquiring data in a distributed storage system. According to an exemplary method, in a process of writing data, a data file is not overwritten but is instead updated by making a copy in a newly allocated storage block and an updated description file is persisted by using an atomic operation. This way, in a process of appending data, it can be ensured that a data file is not damaged, and the readability and consistency of data are maintained, facilitating the use by a user. Further, writing data according to some embodiments of the present application supports a write in which a user specifies a write position of to-be-written data, and also supports a write in which the user does not specify a write position of to-be-written data, thereby improving the flexibility of writing data.

Abstract: Apparatuses and methods are disclosed for cluster switching. An exemplary method may include synchronizing original data on a first cluster to a second cluster after starting to switch clusters. A priority of the original data on the second cluster is set to a lower priority. The method may also include responding to a write operation request on the second cluster in the period of synchronizing the original data on the first cluster to the second cluster. A priority of new data corresponding to the write operation request is set to a higher priority. A version of data with a higher priority can overwrite another version of data. The method may further include responding to the write operation request on the second cluster after synchronizing the original data on the first cluster to the second cluster.