WO2016101758A1

WO2016101758A1 - Cross-cluster data synchronization method and device

Info

Publication number: WO2016101758A1
Application number: PCT/CN2015/095504
Authority: WO
Inventors: 李明昊; 陈营; 宋昭; 陈宗志; 王超
Original assignee: 北京奇虎科技有限公司; 奇智软件（北京）有限公司
Priority date: 2014-12-27
Filing date: 2015-11-25
Publication date: 2016-06-30
Also published as: CN104580183B; CN104580183A

Abstract

Provided are a cross-cluster data synchronization method and device. The method specifically comprises: receiving data from a first cluster and first timestamp information corresponding thereto, wherein the first timestamp information is a set of a first expiration time of the data and a sending time when the data is sent by the first cluster; according to the first timestamp information and a receiving time corresponding thereto, generating a second expiration time corresponding to the data; and executing a write-in operation on the data and the second expiration time corresponding to the data, so as to store same in a second cluster. The embodiments of the present invention can guarantee the synchronization of timeliness data in a first cluster and a second cluster.

Description

Cross-cluster data synchronization method and device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a data synchronization method and apparatus across a cluster.

Background technique

Compared with the mainframe, the advantages of the cluster service system are not only low price and high availability, but also strong scalability, which is very popular among users in network applications.

In order to reduce the frequency of application client access to the database in the cluster, a corresponding cache may be set for the cluster, wherein the cache may store part of the data in the database (such as frequently accessed data), so that the client can access the cluster. First, the data is read from the cache, and when the cache hit fails, the database is queried, so that the access frequency to the database can be reduced, and the running performance of the application can be improved.

Currently, data synchronization across clusters is especially important because caches in each cluster can receive and process client access requests.

Summary of the invention

In view of the above problems, the present invention has been made in order to provide a cross-cluster data synchronization method and apparatus that overcomes the above problems or at least partially solves the above problems.

According to an aspect of the present invention, a data synchronization method across a cluster is provided, including:

Receiving data from the first cluster and corresponding first timestamp information; wherein the first timestamp information is a set of a first expiration time of the data and a sending time when the data is sent by the first cluster ;

Generating a second expiration time corresponding to the data according to the first timestamp information and its corresponding receiving time;

A write operation is performed on the data and the second expiration time corresponding to the data to be stored in the second cluster.

According to another aspect of the present invention, a computer program comprising computer readable code is provided, When the computer readable code is run on a computing device, the computing device is caused to perform the cross-cluster data synchronization method described above.

According to still another aspect of the present invention, there is provided a computer readable medium storing the computer program described above.

According to still another aspect of the present invention, a cross-cluster data synchronization apparatus is provided, including:

a first receiving module, configured to receive data from the first cluster and corresponding first timestamp information, where the first timestamp information is a first expiration time of the data and the data is used by the first cluster a collection of times when sending;

Generating a module, configured to generate a second expiration time corresponding to the data according to the first timestamp information and a corresponding receiving time thereof;

And a write module configured to perform a write operation on the data and a second expiration time corresponding to the data to be stored in the second cluster.

A cross-cluster data synchronization method and apparatus according to an embodiment of the present invention receives data from a first cluster and corresponding first timestamp information, and according to the first timestamp information and a corresponding receiving time thereof, Generating a second expiration time corresponding to the data; and generating a second expiration because the first timestamp information is a set of a first expiration time of the data and a sending time when the data is sent by the first cluster The receiving time corresponding to the first timestamp information is considered in the process of time, that is, the influence of the transmission time on the first expiration time is considered, so that the synchronization of the time-sensitive data in the first cluster and the second cluster can be ensured.

The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. Specific embodiments of the invention are set forth below.

DRAWINGS

Various other advantages and benefits will become apparent to those skilled in the art from a The drawings are only for the purpose of illustrating alternative embodiments and are not to be considered as limiting. Throughout the drawings, the same reference numerals are used to refer to the same parts. In the drawing:

1 is a flow chart showing the steps of a cross-cluster data synchronization method according to an embodiment of the present invention;

2 is a flow chart showing the steps of a data synchronization method across a cluster according to an embodiment of the present invention;

3 is a flow chart showing the steps of a cross-cluster data synchronization method according to an example of the present invention;

4 is a flow chart showing the steps of a cross-cluster data synchronization method according to an embodiment of the present invention;

FIG. 5 is a flow chart showing the steps of a cross-cluster data synchronization method according to an embodiment of the present invention;

6 is a flow chart showing the steps of a data synchronization method across a cluster according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a cluster system according to an embodiment of the present invention; FIG.

FIG. 8 is a flow chart showing the steps of a data processing method of the cache 1 shown in FIG. 7 according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a data synchronization device across a cluster according to an embodiment of the present invention; FIG.

Figure 10 schematically shows a block diagram of a computing device for performing the method according to the invention;

Fig. 11 schematically shows a storage unit for holding or carrying program code implementing the method according to the invention.

detailed description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the embodiments of the present invention have been shown in the drawings, the embodiments Rather, these embodiments are provided so that this disclosure will be more fully understood and the scope of the disclosure will be fully disclosed.

Referring to FIG. 1, a data synchronization method across a cluster according to an embodiment of the present invention is illustrated. The schematic diagram of the step process may specifically include the following steps:

Step 101: Receive data from the first cluster and corresponding first timestamp information, where the first timestamp information is a first expiration time of the data and a sending when the data is sent by the first cluster a collection of time;

Step 102: Generate a second expiration time corresponding to the data according to the first timestamp information and a corresponding receiving time thereof;

Step 103: Perform a write operation on the data and a second expiration time corresponding to the data to be stored in the second cluster.

The embodiment of the present invention can be applied to a cluster system of various service scenarios for performing data synchronization across a cluster, where the cluster unit can be an IDC (Internet Data Center) or a computer room, etc., in the embodiment of the present invention. There are no restrictions on specific cluster units.

For some business scenarios of a cluster, its data tends to be time-sensitive. In addition, in order to improve the cache hit rate, the data cached in the cluster also needs to be time-sensitive to adapt to changes in the business scenario data by updating the cache. In order to achieve time-sensitive management, a write interface that sets an expiration time can be provided for the data, and the write interface can be used to set the expiration time of the data when the data is written. For example, in an application example of the present invention, the write interface set_with_ttl(key, value, ttl) interface can be used to simultaneously write the expiration time ttl of the key-value specified key-value, so that the data collation process can be based on the ttl The key-value is sorted. For example, after the ttl expires, the key-value can be deleted.

Embodiments of the present invention can be used for synchronization of time-sensitive data across clusters. In the conventional solution, after the event of the key_value and its corresponding ttl1 is written by the set_with_ttl (key, value, ttl) interface, the data synchronization process between the IDCl and the ID2 is triggered, and the data synchronization process may be specifically performed. Including: IDC1 sends the key-value and its corresponding ttl1 to IDC2; after receiving the key-value and its corresponding ttl1, the IDC2 side also writes the key-value by calling the set_with_ttl(key, value, ttl) interface. Corresponds to ttl1. The above data synchronization process does not consider the transmission time of the data, and thus causes the synchronization of the time-sensitive data in IDC1 and IDC2. Assuming that ttl1 is 100s and the key-value transmission time is 10s, then the ID-side key-value will expire after 100s, and the IDC2 side key-value will be after 110s. Expired, obviously, The key-values in IDC1 and IDC2 are not synchronized.

In the embodiment of the present invention, the first cluster and the second cluster may be a triggering party and a receiving party of the data synchronization, where the first cluster may send the data to the second cluster when the data stored in the second cluster changes. Corresponding first timestamp information; wherein the first timestamp information is a set of an expiration time of the data and a sending time when the data is sent by the first cluster.

In a specific implementation, when a write operation is performed on the second expiration time corresponding to the data and the data to be stored in the second cluster, the data may be written into a database or a cache of the cluster, which is in the embodiment of the present invention. The specific write position is not limited.

In summary, in the embodiment of the present invention, the data from the first cluster and the corresponding first timestamp information are received, and the second corresponding to the data is generated according to the first timestamp information and the corresponding receiving time. An expiration time; wherein the first timestamp information is a set of a first expiration time of the data and a transmission time when the data is sent by the first cluster, and the second expiration time is considered in the process of generating the second expiration time The receiving time corresponding to the first timestamp information, that is, the influence of the transmission time on the first expiration time, is considered, so that the synchronization of the time-sensitive data in the first cluster and the second cluster can be ensured.

Referring to FIG. 2, a schematic flowchart of a step of a data synchronization method for a cross-cluster according to an embodiment of the present invention is shown.

Step 201: Receive data from the first cluster and corresponding first timestamp information, where the first timestamp information is a first expiration time of the data and a sending when the data is sent by the first cluster a collection of time;

Step 202: Record, when receiving data from the first cluster and the corresponding first timestamp information, record a corresponding receiving time;

Step 203: Read the first timestamp information.

Step 204: Acquire a second expiration time corresponding to the data according to the first timestamp information and the receiving time;

Step 205: Perform a write operation on the data and the second expiration time corresponding to the data to be stored in the second cluster.

The process of generating the second expiration time corresponding to the data according to the first timestamp information and the corresponding receiving time by the second cluster is implemented by the step 202 and the step 204 in the embodiment. Since the receiving time corresponding to the first timestamp information is considered in the process of generating the second expiration time, that is, the influence of the transmission time on the first expiration time is considered, so that the first cluster and the second cluster can be guaranteed. Synchronization of time-sensitive data.

For a better understanding of the present invention by those skilled in the art, with reference to FIG. 3, a flow chart of the steps of a data synchronization method for a cross-cluster according to an example of the present invention is shown, which may specifically include the following steps:

Step 301: After writing key-value-ttl1, IDC1 generates first timestamp information expired_time=ttl1+current_time, and transmits key, value, and expired_time to IDC2; wherein, ttl is the first expiration time of key-value;

Step 302, IDC2 receives the key, value and expired_time, and records the corresponding receiving time current_timel;

Step 303, IDC2 generates a second expiration time ttl2=expired_time-current_time1;

Step 304 IDC2 performs a write operation on key, value, and tt2.

It is assumed that the first expiration time ttl1 of the data is 100s, and the transmission time current_time when the data is transmitted by the first cluster is 1:50, further assuming that the reception time current_time1 for the first timestamp information is 2:00, Then, according to the first timestamp information and the corresponding receiving time, the second expiration time corresponding to the data is generated: 100s+1:50-2:00=90s, so the first cluster and the second group can be guaranteed. Synchronization of time-sensitive data in a cluster.

Referring to FIG. 4, a schematic flowchart of a step of a data synchronization method for a cross-cluster according to an embodiment of the present invention is shown.

Step 401: Receive data from the first cluster and corresponding first timestamp information, where the first timestamp information is a first expiration time of the data and a sending when the data is sent by the first cluster a collection of time;

Step 402: Record, when receiving data from the first cluster and the corresponding first timestamp information, record a corresponding receiving time;

Step 403: Acquire, according to the first timestamp information, a sending time corresponding to the first expiration time and the first expiration time;

Step 404: Obtain a second expiration time corresponding to the data according to the first expiration time, the sending time and the receiving time corresponding to the first expiration time, and

Step 405: Perform a write operation on the data and the second expiration time corresponding to the data to be stored in the second cluster.

The process of generating the second expiration time corresponding to the data according to the first timestamp information and the corresponding receiving time of the second cluster is implemented by the step 402 and the step 404. The process of obtaining the second expiration time corresponding to the data in step 404 may be: second expiration time=first expiration time+(reception time-transmission time); since the difference between the reception time and the transmission time is the transmission time That is, in the process of generating the second expiration time, the influence of the transmission time on the first expiration time is considered, so that the synchronization of the time-sensitive data in the first cluster and the second cluster can be ensured.

Referring to FIG. 5, a schematic flowchart of a step of a data synchronization method for a cross-cluster according to an embodiment of the present invention is shown.

Step 501: Receive data from the first cluster and corresponding first timestamp information, where the first timestamp information is a first expiration time of the data and a sending when the data is sent by the first cluster a collection of time;

Step 502: Generate a second expiration time corresponding to the data according to the first timestamp information and the corresponding receiving time.

Step 503: Perform a write operation on the data and a second expiration time corresponding to the data to be stored in the second cluster;

Step 504: When the data stored in the second cluster changes, send the change data and the corresponding second timestamp information to the first cluster, where the second timestamp information is a third expiration time of the data. And a set of transmission times when the change data is transmitted by the second cluster.

Compared with the embodiment shown in FIG. 1 , in addition to receiving the data from the first cluster and the corresponding first timestamp information, the embodiment may further change the data stored in the second cluster. The first cluster sends the change data and the corresponding second timestamp information, that is, the data synchronization of the first cluster to the second cluster can be implemented, and the data synchronization of the second cluster to the first cluster can also be implemented.

In an optional embodiment of the present invention, the method may further include: receiving, after the data stored in the first cluster changes, the changed data sent by the first cluster and the corresponding third timestamp information; The third timestamp information is a set of an expiration time of the changed data and a sending time when the changed data is sent by the first cluster. In this alternative embodiment, the data of the first cluster may be changed as follows: key-value-ttl1 is changed to key-value-ttl3, and the third timestamp information corresponding to the changed data may be generated according to the following procedure: expired_time3=ttl3 +current_time3, where expired_time3, ttl3, and current_time3 represent the third timestamp information, the expiration time of the changed data, and the transmission time when the changed data is transmitted by the first cluster, respectively.

In another optional embodiment of the present invention, the method may further include: generating, according to the third timestamp information and the corresponding receiving time, a fourth expiration time corresponding to the changed data; and utilizing And receiving the changed data and the fourth expiration time, and updating the second expiration time corresponding to the data stored in the second cluster and the data.

For the above example, after receiving the key, value, and expired_time3, the corresponding receiving time current_time4 can be recorded, and a fourth expiration time ttl4=expired_time3-current_time4 is generated. Then, the process of updating the data stored in the second cluster and the second expiration time corresponding to the data may be: updating key-value-ttl2 to key-value-ttl4.

Referring to FIG. 6, a schematic flowchart of a step of a data synchronization method for a cross-cluster according to an embodiment of the present invention is shown.

Step 601: Receive data from the first cluster and corresponding first timestamp information, where the first timestamp information is a first expiration time of the data and a sending when the data is sent by the first cluster a collection of time;

Step 602: Generate a second expiration time corresponding to the data according to the first timestamp information and a corresponding receiving time thereof;

Step 603: Write the second expiration time corresponding to the data and the data to the cache system of the second cluster.

Compared with the embodiment shown in FIG. 1 , the embodiment may write the data and the second expiration time corresponding to the data into the cache system of the second cluster, so that data synchronization across the cluster cache can be implemented.

Referring to FIG. 7, a schematic structural diagram of a cluster system according to an embodiment of the present invention may be further illustrated, which may include: IDC1 and IDC2, wherein the IDC1 side is provided with a client 1 and a cache 1, and the IDC2 side is provided with a client. 2 and cache 2, IDC1 and IDC2 have a common database, which is connected to cache 1 and cache 2 respectively, and client 1 can send a read request or a write request to cache 1, and client 2 can send a read request to cache 2. Or the write request, and when the data stored in the cache 1 or the cache 2 changes, the data synchronization process to another cache may be triggered, and the cache 1 is taken as an example. 1 New data is written to the cache, or the database writes new data to the cache, and so on.

FIG. 8 is a flow chart showing the steps of the data processing method of the cache 1 shown in FIG. 7 according to an embodiment of the present invention. Specifically, the method may include the following steps:

Step 801, the cache 1 receives a read request from the client 1;

Step 802, the cache 1 determines whether it has the data corresponding to the read request, and if so, step 803 is performed, otherwise step 804 is performed;

Step 803, the cache 1 returns the first data corresponding to the read request to the client 1;

Step 804, the cache 1 requests the database to forward the read request, and receives the first data corresponding to the read request returned by the database and the expiration time of the first data, and performs the

steps

803 and 805;

Step 805: The cache 1 sends the first data and its corresponding fourth timestamp information to the cache 2, where the fourth timestamp information is an expiration time of the first data and the first data is cached. 1 a collection of transmission times at the time of transmission;

Step 806, the cache 1 receives a write request from the client 1;

Step 807: The cache 1 writes the expiration time of the second data and the second data corresponding to the write request to the cache, and sends the second data and the corresponding fifth timestamp information to the cache 2; The fifth timestamp information is a set of an expiration time of the second data and a transmission time when the second data is sent by the cache 1.

For the method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should understand that the embodiments of the present invention are not limited by the described action sequence, because the embodiment according to the present invention Some steps can be performed in other orders or at the same time. In the following, those skilled in the art should also understand that the embodiments described in the specification are optional embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

FIG. 9 is a schematic structural diagram of a data synchronization device for a cross-cluster according to an embodiment of the present invention. The device may be configured as a second cluster side, and may specifically include the following modules:

The first receiving module 901 is configured to receive data from the first cluster and corresponding first timestamp information, where the first timestamp information is a first expiration time of the data and the data is first a collection of transmission times when the cluster is sent;

The generating module 902 is configured to generate a second expiration time corresponding to the data according to the first timestamp information and its corresponding receiving time;

The writing module 903 is configured to perform a write operation on the data and a second expiration time corresponding to the data to be stored in the second cluster.

In an optional embodiment of the present invention, the generating module 902 may further include:

a first recording submodule configured to record a corresponding receiving time when receiving data from the first cluster and corresponding first timestamp information;

Reading a submodule configured to read the first timestamp information;

The first obtaining submodule is configured to acquire a second expiration time corresponding to the data according to the first timestamp information and the receiving time.

In another optional embodiment of the present invention, the generating module 902 may further include:

a second recording submodule configured to record a corresponding receiving time when receiving data from the first cluster and the corresponding first timestamp information;

a second obtaining submodule configured to acquire, according to the first timestamp information, a sending time corresponding to the first expiration time and the first expiration time;

The third obtaining sub-module is configured to acquire a second expiration time corresponding to the data according to the first expiration time, the sending time and the receiving time corresponding to the first expiration time.

In still another optional embodiment of the present invention, the writing module 903 may be specifically configured to write the data and the second expiration time corresponding to the data into the cache system of the second cluster.

In still another optional embodiment of the present invention, the apparatus may further include:

a sending module, configured to send the change data and the corresponding second timestamp information to the first cluster when the data stored in the second cluster changes; wherein the second timestamp information is the third of the data The set of expiration times and the transmission time when the change data is transmitted by the second cluster.

In an optional embodiment of the present invention, the device may further include:

The second receiving module is configured to receive the changed data and the corresponding third timestamp information sent by the first cluster when the data stored in the first cluster changes; wherein the third timestamp information is The set of the expiration time of the changed data and the transmission time when the changed data is transmitted by the first cluster.

In another optional embodiment of the present invention, the device may further include:

a generating module, configured to generate a fourth expiration time corresponding to the changed data according to the third timestamp information and a corresponding receiving time thereof;

And an update module configured to update the data stored in the second cluster and the second expiration time corresponding to the data by using the received changed data and the fourth expiration time.

For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

The various component embodiments of the present invention may be implemented in hardware, or in a software module running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or digital signal processor (DSP) may be used in practice to implement some or all of some or all of the components of the cross-cluster data synchronization method and apparatus in accordance with embodiments of the present invention. Features. The invention can also be implemented as a device or device program (e.g., a computer program and a computer program product) for performing some or all of the methods described herein. Such a program implementing the present invention may be stored on a computer readable medium or may have one or The form of multiple signals. Such signals may be downloaded from an internet platform, provided on a carrier signal, or provided in any other form.

For example, Figure 10 illustrates a computing device, such as a search engine server, that can implement the above described method in accordance with the present invention. The computing device conventionally includes a processor 1010 and a computer program product or computer readable medium in the form of a memory 1030. The memory 1030 may be an electronic memory such as a flash memory, an EEPROM (Electrically Erasable Programmable Read Only Memory), an EPROM, a hard disk, or a ROM. The memory 1030 has a storage space 1050 that stores program code 1051 for performing any of the method steps described above. For example, storage space 1050 storing program code may include various program codes 1051 for implementing various steps in the above methods, respectively. The program code can be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. Such a computer program product is typically a portable or fixed storage unit such as that shown in FIG. The storage unit may have storage segments, storage spaces, and the like that are similarly arranged to memory 1030 in the computing device of FIG. The program code can be compressed, for example, in an appropriate form. Typically, the storage unit comprises computer readable code 1051' for performing the steps of the method according to the invention, ie code that can be read by a processor such as 1010, which when executed by the server causes the server to execute the above Each step in the described method.

"an embodiment," or "an embodiment," or "an embodiment," In addition, it is noted that the phrase "in one embodiment" is not necessarily referring to the same embodiment.

In the description provided herein, numerous specific details are set forth. However, it is understood that the embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of the description.

It is to be noted that the above-described embodiments are illustrative of the invention and are not intended to be limiting, and that the invention may be devised without departing from the scope of the appended claims. In the claims, any reference symbol between parentheses should not be constructed as a right Required restrictions. The word 'comprising' does not exclude the presence of the elements or steps that are not recited in the claims. The word "a" or "an" The invention can be implemented by means of hardware comprising several distinct elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means can be embodied by the same hardware item. The use of the words first, second, and third does not indicate any order. These words can be interpreted as names.

In addition, it should be noted that the language used in the specification has been selected for the purpose of readability and teaching, and is not intended to be construed or limited. Therefore, many modifications and changes will be apparent to those skilled in the art without departing from the scope of the invention. The disclosure of the present invention is intended to be illustrative, and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

A cross-cluster data synchronization method, including:

Receiving data from the first cluster and corresponding first timestamp information; wherein the first timestamp information is a set of a first expiration time of the data and a sending time when the data is sent by the first cluster ;

Generating a second expiration time corresponding to the data according to the first timestamp information and its corresponding receiving time;

A write operation is performed on the data and the second expiration time corresponding to the data to be stored in the second cluster.
The method of claim 1, wherein the step of generating, by the second cluster, the second expiration time corresponding to the data according to the first timestamp information and the corresponding receiving time comprises:

Recording a corresponding receiving time when receiving data from the first cluster and its corresponding first timestamp information;

Reading the first timestamp information;

Obtaining a second expiration time corresponding to the data according to the first timestamp information and the receiving time.
The method of claim 1, wherein the step of generating, by the second cluster, the second expiration time corresponding to the data according to the first timestamp information and the corresponding receiving time comprises:

Recording a corresponding receiving time when receiving data from the first cluster and its corresponding first timestamp information;

Obtaining, according to the first timestamp information, a sending time corresponding to the first expiration time and the first expiration time;

Obtaining a second expiration time corresponding to the data according to the first expiration time, the sending time and the receiving time corresponding to the first expiration time.
The method according to claim 1 or 2 or 3, wherein said writing operation is performed on said data and said second expiration time corresponding to said data to be stored in said second cluster for storage in said second cluster for storage The steps of the second cluster include:

And writing the second expiration time corresponding to the data and the data to the cache system of the second cluster itself.
The method of claim 1 or 2 or 3, wherein the method further comprises:

Transmitting the change data and the corresponding second timestamp information to the first cluster when the data stored in the second cluster changes; wherein the second timestamp information is a third expiration time of the data and the The set of transmission times when the change data is transmitted by the second cluster.
The method of claim 1 or 2 or 3, further comprising:

And receiving, after the data stored in the first cluster, the changed data and the corresponding third timestamp information sent by the first cluster, where the third timestamp information is an expiration time of the changed data and The set of times when the changed data is transmitted by the first cluster.
The method of claim 6 further comprising:

Generating, according to the third timestamp information and the corresponding receiving time, a fourth expiration time corresponding to the changed data;

And using the received changed data and the fourth expiration time, updating the second expiration time corresponding to the data stored in the second cluster and the data.
A computer program comprising computer readable code causing the computing device to perform cross-cluster data synchronization according to any one of claims 1 to 7 when the computer readable code is run on a computing device method.
A computer readable medium storing the computer program of claim 8.
A cross-cluster data synchronization device, comprising:

a first receiving module, configured to receive data from the first cluster and corresponding first timestamp information, where the first timestamp information is a first expiration time of the data and the data is used by the first cluster a collection of times when sending;

Generating a module, configured to generate a second expiration time corresponding to the data according to the first timestamp information and a corresponding receiving time thereof;

And a write module configured to perform a write operation on the data and a second expiration time corresponding to the data to be stored in the second cluster.
The device of claim 10, wherein the generating module comprises:

a first recording submodule configured to record a corresponding receiving time when receiving data from the first cluster and corresponding first timestamp information;

Reading a submodule configured to read the first timestamp information;

The first obtaining submodule is configured to acquire a second expiration time corresponding to the data according to the first timestamp information and the receiving time.
The device of claim 10, wherein the generating module comprises:

a second recording submodule configured to record a corresponding receiving time when receiving data from the first cluster and the corresponding first timestamp information;

a second obtaining submodule configured to acquire, according to the first timestamp information, a sending time corresponding to the first expiration time and the first expiration time;

The third obtaining sub-module is configured to acquire a second expiration time corresponding to the data according to the first expiration time, the sending time and the receiving time corresponding to the first expiration time.
The device of claim 10 or 11 or 12, wherein the writing module is specifically configured to write the data and a second expiration time corresponding to the data to a cache system of the second cluster.
The device of claim 10 or 11 or 12, wherein the device further comprises:

a sending module, configured to send the change data and the corresponding second timestamp information to the first cluster when the data stored in the second cluster changes; wherein the second timestamp information is the third of the data The set of expiration times and the transmission time when the change data is transmitted by the second cluster.
The device of claim 10 or 11 or 12, wherein the device further comprises:

The second receiving module is configured to receive the changed data and the corresponding third timestamp information sent by the first cluster when the data stored in the first cluster changes; wherein the third timestamp information is The set of the expiration time of the changed data and the transmission time when the changed data is transmitted by the first cluster.
The device of claim 15 wherein said device further comprises:

a generating module, configured to generate a fourth expiration time corresponding to the changed data according to the third timestamp information and a corresponding receiving time thereof;

And an update module configured to update the data stored in the second cluster and the second expiration time corresponding to the data by using the received changed data and the fourth expiration time.