Method and system for data synchronization

• US 9,525,733 B2
• Filed: 06/24/2015
• Issued: 12/20/2016
• Est. Priority Date: 12/25/2012
• Status: Active Grant

• Current Assignee: Tencent Technology Company Limited (Tencent Holdings Limited)
• Original Assignee: Tencent Technology Company Limited (Tencent Holdings Limited)
• Inventors: Jiang, Xingcai, Zhou, Zhihao, Tian, Ming, Liu, Li
• Primary Examiner(s): Boutah, Alina N
• Application Number:
  US14/749,579
• Publication Number:
  US 20150312340A1
• Time in Patent Office: 545 Days
• Field of Search: 709216-219, 709208-212, 707640-641, 707/802, 707/809
• US Class Current: 1/1
• CPC Class Codes: G06F 16/119 Details of migration of file systems migration mechanisms in storage systems G06F3/0647
• CPC Class Codes: G06F 16/128 Details of file system snapshots on the file-level, e.g. snapshot creation, administration, deletion use of snapshots for error detection or correction G06F11/14, G06F11/16
• CPC Class Codes: G06F 16/178 Techniques for file synchronisation in file systems
• CPC Class Codes: G06F 16/27 Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

A data synchronization method is provided. The data synchronization method includes providing a first server with a master flag and a write flag for a data block; providing a second server; and importing a snapshot of the data block to the second server. The method further includes configuring a synchronizing flag for the data block on the second server; synchronizing, by a synchronizing component, data of the data block on the first server to the second server; and removing the write flag of the data block on the first server when the data block is to be migrated out of the first server. The method also includes synchronizing, by the synchronizing component, latest data of the data block on the first server to the second server; removing the master flag of the data block on the first server and removing the synchronizing flag of the data block on the second server after data of the data block on the second server and the data of the data block on the first server are completely synchronized; and configuring a master flag and a write flag for the data block on the second server.

Claims

1. A data synchronization method, comprising:

providing a first server with a master flag and a write flag for a data block;

providing a second server;

importing a snapshot of the data block to the second server;

configuring a synchronizing flag for the data block on the second server;

synchronizing, by a synchronizing component, data of the data block on the first server to the second server;

removing the write flag of the data block on the first server when the data block is to be migrated out of the first server;

synchronizing, by the synchronizing component, latest data of the data block on the first server to the second server;

removing the master flag of the data block on the first server and removing the synchronizing flag of the data block on the second server after data of the data block on the second server and the data of the data block on the first server are completely synchronized; and

configuring a master flag and a write flag for the data block on the second server.

2. The data synchronization method according to claim 1, removing the master flag of the data block on the first server further comprising:

deleting the data block on the first server to reclaim space occupied by the data block.

3. A data synchronization method, comprising:

providing a first server with a synchronizing flag for a data block;

providing a second server with a master flag and a write flag for the data block;

synchronizing, by a synchronizing component, data of the data block on the second server with the first server;

removing the master flag of the data block on the second server and removing the synchronizing flag of the data block on the first server if an error occurs on the second server; and

configuring a master flag and a write flag for the data block on the first server;

importing a snapshot of the data block to the second server after the second server recovers from the error;

configuring a synchronizing flag for the data block on the second server;

synchronizing, by the synchronizing component, data of the data block on the first server to the second server;

removing the write flag of the data block on the first server when a master status of the second server for the data block is to be restored;

synchronizing, by the synchronizing component, latest data of the data block on the first server to the second server;

removing the master flag of the data block on the first server and removing the synchronizing flag of the data block on the second server after the data of the data block on the second server and the data of the data block on the first server are completely synchronized; and

configuring a master flag and a write flag for the data block on the second server and configuring a synchronizing flag for the data block on the first server.

4. A data synchronization system, comprising:

a first server;

a second server;

a configuring module, configured to generate a master flag and a write flag for the data block on the first server;

an import module, configured to import a snapshot of the data block to a memory of the second server; and

a synchronizing component, configured to synchronize data of the data block on the first server to the second server, wherein;

the configuring module is further configured to generate a synchronizing flag for the data block on the second server;

to remove the write flag of the data block on the first server when the data block is to be migrated out of the first server; and

to remove the master flag of the data block on the first server and remove the synchronizing flag of the data block on the second server after data of the data block on the second server and data of the data block on the first server are completely synchronized, and to generate a master flag and a write flag for the data block on the second server.

5. The data synchronization system according to claim 4, further comprising a clearing module, wherein after the configuring module removes the master flag of the data block on the first server, the clearing module clears the data block on the first server to reclaim space occupied by the data block.

6. The data synchronization system according to claim 4, wherein the synchronizing component synchronizes data on the first server marked with a master flag to the second server marked with a synchronizing flag.

7. A data synchronization system, comprising:

a first server;

a second server;

a configuring module, configured to generate a synchronizing flag for a data block on the first server, and configured to generate a master flag and a write flag for the data block on the second server;

a synchronizing component, configured to synchronize data of the data block on the second server to the first server; and

an import module, configured to import a snapshot of the data block to a memory of the second server after the second server recovers from the error, wherein;

the configuring module is further configured to remove the master flag of the data block on the second server and remove the synchronizing flag of the data block on the first server if an error occurs on the second server, and generate a master flag and a write flag for the data block on the first server; and

to generate a synchronizing flag for the data block on the second server after the second server recovers from the error;

the synchronizing component is further configured to synchronize data of the data block on the first server to the second server after the second server recovers from the error; and

the configuring module is further configured to remove the write flag of the data block on the first server when a master status of the second server for the data block is to be restored; and

to remove the master flag of the data block on the first server and remove the synchronizing flag of the data block on the second server after data of the data block on the second server and data of the data block on the first server are completely synchronized, and generate a master flag and a write flag for the data block on the second server and generate a synchronizing flag for the data block on the first server.

8. The data synchronization system according to claim 7, wherein the synchronizing component synchronizes data on a master server marked with a master flag to a slave server marked with a synchronizing flag.