CN103095769A - Cross-machine-room data synchronism method and system - Google Patents
Cross-machine-room data synchronism method and system Download PDFInfo
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Abstract
The invention discloses a cross-machine-room data synchronism method which comprises a demand processing method of parallel processing and a long-distance synchronism method. According to the demand processing method, requests are processed by local sites, index key value used for unique location is built for changed data, and the index key value is added to a first in first out (FIFO) queue. According to the long-distance synchronism method, the corresponding changed data contents are found by the local sites according to the index key value in the FIFO queue, and synchronous instructions are sent to each long-distance site. The invention further discloses a cross-machine-room data synchronism system corresponding to the cross-machine-room data synchronism method. The cross-machine-room data synchronism method and the system have the advantages of being short in delay time and waiting time, low in energy consumption and correct in data synchronism of the long-distance sites from beginning to end.
Description
Technical field
The application relates to a kind of method of data synchronization and system.
Background technology
For data safety backup or raising various places user's the purposes such as access speed, a plurality of websites are disposed in some the Internet standing-meetings in the different location, as shown in Figure 1.Wherein each website is a station server or the cluster that is comprised of multiple servers.Require between these websites to keep data synchronous, so that the data content of wherein storing is consistent.
In multi-site deployment scheme across machine room shown in Figure 1, when 1 pair of website 1 of requesting party was filed a request, website 1 was as site-local, and all the other websites are all as remote site.And when 2 pairs of websites 2 of requesting party were filed a request, website 2 was as site-local, and all the other websites are all as remote site.That is to say, site-local and remote site are to distinguish according to the spot of each request.
Synchronous in order to realize across data between the multi-site of machine room, the method that adopts at present has following two kinds:
First method adopts synchronous data transmission, as shown in Figure 2.The requesting party files a request to site-local.Described request can be one or more in the operation such as increase, modification or the deletion of data.Site-local is processed this request according to action type.After site-local is successfully handled this request, forward this request to remote site with the form of synchronization message.Described synchronization message has such characteristics: transmit leg will stop up the process of himself after being sent, until receive the response to this synchronization message, just continues to process other task downwards.Site-local waits for that remote site returns to result, and all return to the result of " successfully handling described request " when all remote sites after, site-local returns to the result of " successfully handling described request " to the requesting party.
The time of delay of method of data synchronization across machine room shown in Figure 2 is long, and requesting party's stand-by period is long.And due to the cross-region unstable networks, easily cause the obstruction that sends or receive the response of synchronization message, even cause the application service of site-local seemingly-dead.In actual applications, seldom adopt this method.
Second method adopts simultaneous asynchronous data transmissions, as shown in Figure 3.The requesting party files a request to site-local.Described request comprises increase, modification, the deletion action of data.Site-local is processed this request.After site-local is successfully handled this request, forward this request to remote site with the form of asynchronous message.Described asynchronous message has such characteristics: transmit leg need not be waited for the response of this asynchronous message after being sent, and just can continue to process other task downwards.After site-local had successfully forwarded this request, site-local just returned to the result of " successfully handling described request " to the requesting party.In actual applications, mostly adopt this method.
Method of data synchronization across machine room shown in Figure 3 owing to need not to wait for that the result of remote site can return to the requesting party, thereby has reduced time of delay and requesting party's stand-by period.But due to reasons such as networks, may cause asynchronous message to transmit unsuccessfully, cause the not synchronous renewal of data of remote site.
In addition, in the data transmission method across machine room shown in Figure 3, due to the timing that can't guarantee each asynchronous message, the situation that legacy data covers new data may appear.Attempt an example explanation, see also Fig. 4:
At t1 constantly, site-local changes the value of data D1 into a1 by a0, sends simultaneously the value of the synchronous Update Table D1 of asynchronous message M1 to other remote sites.
After t2 constantly, site-local changes the value of data D1 into a2 by a1, sends simultaneously the value of the synchronous Update Table D1 of asynchronous message M2 to other remote sites.
The priority that there is no sequential due to asynchronous message M1, M2.Remote site R1 may after t3 constantly first receive asynchronous message M2, thereby change the value of data D1 into a2 by a0.
Then after the t4 moment, remote site R1 has received again asynchronous message M1, thereby changes the value of data D1 into a1 by a2.
The situation of new data a2 has just occured to cover with legacy data a1 in remote site R1 this moment place, and this is incorrect.
Above-mentioned two kinds of methods all can not solve the data synchronization problems across machine room effectively.And be no matter with synchronization message or with the form Forward-reques of asynchronous message, site-local all needs to hold the copy of this request, thereby has wasted a large amount of memory sources, causes the problems such as inefficiency.
Summary of the invention
The application provides a kind of method of data synchronization across machine room based on FIFO (first-in first-out) formation, when guaranteeing to have shorter time of delay, guarantees that data correctly transfer to remote site and upgrade.For this reason, the application also will provide corresponding with it a kind of data synchronous system across machine room.
For solving the problems of the technologies described above, the application comprises request processing method and the remote synchronization method of parallel processing across the method for data synchronization of machine room;
In the described request processing method, site-local is processed request, and is used for the index key assignments of unique location for the data creation that change occurs, and adds described index key assignments to a fifo queue;
In described remote synchronization method, site-local finds the data content of corresponding generation change according to the index key assignments in described fifo queue, sends synchronic command to each remote site.
The application comprises across the data synchronous system of machine room:
Be used for processing request at site-local, and be that the data that change occurs are set up an index key assignments that is used for unique location, and described index key assignments is added to the device of a fifo queue;
Be used for storing the device of described fifo queue;
Be used for finding corresponding data content according to every index key assignments of described fifo queue from site-local, and send the device of synchronic command to each remote site.
The application has short characteristics time of delay across method of data synchronization and the system of machine room.This is because site-local only need to be submitted to a fifo queue with the index key assignments of data of change, just can return to result to the requesting party, and this fifo queue is stored in site-local, thereby requesting party's stand-by period is short.
The application has been across having introduced a fifo queue in the data synchronous system of machine room and method thereof, and it is to be formed by the index key assignments that the data of change occur site-local, can be considered the data synchronous task list of site-local and remote site.Do not preserve the data content of actual generation change due to this formation, and the index key assignments of the data of change just occurs, thereby the storage resources that consumes, computing resource etc. are all lower.
Description of drawings
Fig. 1 is the schematic diagram across the site deployment of machine room;
Fig. 2 is the flow chart of existing a kind of method of data synchronization across machine room (synchronous data transmission);
Fig. 3 is that existing another kind is across the flow chart of the method for data synchronization (simultaneous asynchronous data transmissions) of machine room;
Fig. 4 is the schematic diagram of makeing mistakes of method of data synchronization across machine room shown in Figure 3;
Fig. 5 is that the application is across total schematic diagram of the method for data synchronization of machine room;
Fig. 6 is that the application is across processing the flow chart of requesting method in the method for data synchronization of machine room;
Fig. 7, Fig. 8 are all that the application is across the flow chart of method of data synchronization in the method for data synchronization of machine room;
Fig. 9, Figure 10 are that the application is across the schematic diagram of method of data synchronization in the method for data synchronization of machine room;
Figure 11 is that the application is across total schematic diagram of the data synchronous system of machine room;
Figure 12 is that the application is across the concrete schematic diagram of the data synchronous system of machine room.
Embodiment
See also Fig. 5, the application comprises two parts across the method for data synchronization of machine room, and first processes request, and second portion is that teledata is synchronous, and these two parts are parallel processing, namely can process simultaneously.
In the described request processing method, site-local is processed request, and is used for the index key assignments of unique location for the data creation that change occurs, and adds described index key assignments to a fifo queue.Described index key assignments preferably adopts the logical address of the data that change occurs, and a kind of index of the data that change namely can unique location occurs by mapping, the relation such as corresponding.
For example, each that store in Database Systems data all comprise major key ID and two parts of data content at least, and the major key ID of every data does not repeat.The major key ID of data of change will occur as the index key assignments in the application.This Typical Representative wherein is the Key-Value database, and the key of the data that generation can be changed is as the index key assignments.
And for example, each that store in file system data all represent respectively a file, and comprising filename (comprising absolute path) is arranged, and the All Files name (comprising absolute path) in file system does not repeat.The filename of data of change will occur as the index key assignments in the application.This is equally applicable to adopt the website of distributed storage.If website adopts distributed storage, and the filename on different server may repeat, and can also will the server identification of data of change and filename (comprising absolute path) occur jointly as the index key assignments.
If what the index key assignments adopted is the physical address that the data of change occur, namely it at the physical storage address of site-local, it should be noted that so: in case after having data deleted, the original physical address of these data can not be write again; Until these data are after the corresponding data of all remote sites is all deleted, the original physical address of these data just can be write again.
Described fifo queue is comprised of described index key assignments.Described fifo queue is exactly that site-local need to carry out the synchronous task list of data to each remote site, and each index key assignments wherein just represents a data synchronous task from the site-local to the remote site.If described fifo queue does not exist, create this fifo queue.
In described remote synchronization method, site-local finds the data content of corresponding generation change according to the index key assignments in described fifo queue, sends synchronic command to each remote site.Described synchronic command comprises increase, revises or the deletion data.
See also Fig. 6, this is an embodiment of the method for described processing request, comprises the steps:
In the a1 step, the requesting party files a request to site-local.Described request can be the operations such as increase, modification or deletion of data.
A2 step, site-local is processed this request, namely increases, the specified data of modification or removal request side.
The a3 step after site-local is successfully handled this request, is the index key assignments of data creation that changes (namely increase, revise or delete), and this index key assignments is used for navigating to uniquely the data that change occurs.
In the a4 step, site-local is put into described index key assignments at the end of a fifo queue.Preferably, be added after fifo queue at described index key assignments, site-local returns to the result of " successfully handling described request " to the requesting party.
See also Fig. 7, Fig. 8, this is an embodiment of the synchronous method of described data, comprises the steps:
In the b1 step, site-local reads an index key assignments from the beginning of described fifo queue.
If successfully read an index key assignments, enter the b2 step.Due to the self-characteristic of fifo queue, after this index key assignments is read, just deletedly from described fifo queue fall.
If do not read the index key assignments, represent that described fifo queue for empty, further shows the current data synchronous task that do not have, return to the b1 step.
In the b2 step, site-local finds the data that change occurs according to the index key assignments that reads.For example find data content according to major key ID in database, perhaps find file content according to filename (comprising absolute path) in file system.
If the data content that occurs to change is empty, what the data of expression generation change were carried out is deletion action, and site-local transfers to remote site with this index key assignments and sends the synchronic command of deleting corresponding data.After remote site receives this synchronic command, find corresponding data according to the index key assignments, and with this data content deletion.Because site-local is consistent with the Stored Data Type of each remote site, therefore all can navigate to uniquely corresponding data content at an index key assignments at each website.
Be not empty if the data content of change occurs, what expression occured that the data of change carry out is to increase or retouching operation, site-local with this index key assignments and data content transmission that change occurs to remote site and send the synchronic command that increases or revise corresponding data.
In the b3 step, site-local is waited for the result of remote site.
If remote site returns to the result of " processing successfully ", return to the b1 step.
If remote site returns to the result of " processing unsuccessfully ", site-local is re-applied to the index key assignments that reads at the end of described fifo queue, and returns to the b1 step.
The application has solved the synchronous correctness problem of data of remote site effectively across the method for data synchronization of machine room.Below attempt two example explanations.
See also Fig. 9, this is that the application is across an embodiment of the method for data synchronization of machine room.
At t1 constantly, site-local changes the value of data D1 into a1 by a0, increases simultaneously the index key assignments DD1 of data D1 to the end of fifo queue.
In the t2 moment after a while, site-local changes the value of data D1 into a2 by a1, increases for the second time again the index key assignments DD1 of data D1 simultaneously to the end of fifo queue.
At t3 constantly, site-local reads the index key assignments DD1 that puts into for the first time fifo queue, finds the value of data D1.T3 is constantly inevitable after the moment, was engraved in t2 before the moment at t1 during this example assumes t3, the value of data D1 is a1 at this moment.Site-local is a1 to the initiate a message value of Update Table D1 of other remote sites, until obtain the confirmation that is successfully modified of each remote site.
In the t4 moment after a while, site-local reads the index key assignments DD1 that puts into for the second time fifo queue, finds again the value of data D1.T4 constantly inevitable t2 constantly after, this moment, the value of data D1 was a2, site-local initiates a message the value of Update Table D1 to a2, until obtain the confirmation that is successfully modified of each remote site to other remote sites again.
See also Figure 10, this be the application across another embodiment of the method for data synchronization of machine room, only be with the difference of Fig. 9: be engraved in during t3 t2 constantly after.This moment, site-local successively sent two message to other remote sites, and the value that is all Update Table D1 is a2, the situation that data are synchronously made mistakes also do not occur.
By above two examples as can be known, the application is across the method for data synchronization of machine room, the data that site-local will occur to change are synchronized to that moment of remote site, only pay close attention to the final state of the data that this moment transmits, and be indifferent to any change that occurs before these data, thereby the situation that legacy data shown in Figure 4 covers new data can not occur.
See also Figure 11, the application comprises across the data synchronous system of machine room:
Be used for processing request at site-local, and be that the data that change occurs are set up an index key assignments that is used for unique location, and described index key assignments is added to the device 51 of a fifo queue;
Be used for storing the device 52 of described fifo queue;
Be used for finding corresponding data content according to every index key assignments of described fifo queue from site-local, and send the device 53 of synchronic command to each remote site.
Above-mentioned data synchronous system across machine room need to be arranged on each website in Fig. 1.In addition, also all comprise at each website the database 550 that stores each data.
See also Figure 12, described device 51 further comprises:
Request receiving device 511 is used for the request of reception requesting party's data processing; Described data processing request can be the data processing operations such as increase, modification or deletion;
Operating result dispensing device 515 is used for and will sends to the requesting party to the operating result of described request.
Described device 52 further comprises:
Described device 53 further comprises:
Index reading 531 is used for reading an index key assignments from the beginning of described fifo queue;
Data content judgment means 533 is used for judging whether the data content that finds is empty;
Operating result receiving system 535 is used for the operating result to described instruction that the receiving remote website feeds back;
Operating result judgment means 536 is used for judging whether the operating result that receives is to operate successfully.
These are only the application's preferred embodiment, and be not used in restriction the application.For a person skilled in the art, the application can have various modifications and variations.All within the application's spirit and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in the application's protection range.
Claims (10)
1. the method for data synchronization across machine room, is characterized in that, comprises request processing method and the remote synchronization method of parallel processing;
In the described request processing method, site-local is processed request, and is used for the index key assignments of unique location for the data creation that change occurs, and adds described index key assignments to a fifo queue;
In described remote synchronization method, site-local finds the data content of corresponding generation change according to the index key assignments in described fifo queue, sends synchronic command to each remote site.
2. the method for data synchronization across machine room according to claim 1, is characterized in that, the described request processing method comprises the steps:
In the a1 step, site-local obtains the request of increase, modification or the deletion data of requesting party's proposition;
In the a2 step, site-local is processed this request;
In the a3 step, after site-local was successfully handled this request, for index key assignments of data creation of change occurs, this index key assignments was used for navigating to uniquely the data that change occurs;
In the a4 step, site-local is put into described index key assignments at the end of a fifo queue, and described fifo queue is comprised of the index key assignments of the data that increase, revise or delete; If this fifo queue does not exist, create this fifo queue.
3. the method for data synchronization across machine room according to claim 1, is characterized in that, described remote synchronization method comprises the steps:
In the b1 step, site-local reads an index key assignments from the beginning of described fifo queue;
If successfully read an index key assignments, enter the b2 step;
If do not read the index key assignments, return to the b1 step;
In the b2 step, site-local finds the data content that change occurs according to the index key assignments that reads;
Be sky if the data content of change occurs, site-local synchronic command that this index key assignments is transferred to remote site and sends deletion;
Be empty if the data content of change occurs, site-local with this index key assignments, change occurs data content transmission to remote site and send and increase or the synchronic command of modification;
In the b3 step, site-local is waited for the result of remote site;
If remote site returns to the result of " processing successfully ", return to the b1 step;
If remote site returns to the result of " processing unsuccessfully ", site-local is re-applied to the index key assignments that reads at the end of described fifo queue, and returns to the b1 step.
4. the method for data synchronization across machine room according to claim 1, is characterized in that, the major key ID that described index key assignments is every data in Database Systems.
5. the method for data synchronization across machine room according to claim 1, is characterized in that, described index key assignments is the filename of each file in file system, and described filename comprises absolute path.
6. the method for data synchronization across machine room according to claim 1, is characterized in that, described synchronic command comprises increase, revises or delete the instruction of data.
7. the data synchronous system across machine room, is characterized in that, comprising:
Be used for processing request at site-local, and be that the data that change occurs are set up an index key assignments that is used for unique location, and described index key assignments is added to the device of a fifo queue;
Be used for storing the device of described fifo queue;
Be used for finding corresponding data content according to every index key assignments of described fifo queue from site-local, and carry out the synchronous device of data to each remote site.
8. the data synchronous system across machine room according to claim 7, it is characterized in that, described for processing request at site-local, and set up an index key assignments that is used for unique location for the data that change occurs, and the device that adds described index key assignments to a fifo queue further comprises:
The request receiving device is used for receiving the request that the requesting party increases, revises or delete data;
The request processing unit is used for according to the request that receives, specific data being increased, revising or deletes;
The index creation device is used to after newly increasing, revising or the data creation index key assignments of deleting;
The index writing station, for the index key assignments that creates being put into the end of a fifo queue, if there is no this fifo queue creates a fifo queue;
The operating result dispensing device is used for and will sends to the requesting party to the operating result of described request.
9. the data synchronous system across machine room according to claim 7, is characterized in that, described device be used to storing described fifo queue further comprises:
The FIFO storage device is used for storing described fifo queue;
The FIFO control device, be used for new data being placed on the end of described fifo queue when new data writes described fifo queue, delete from described fifo queue from the beginning reading out data of described fifo queue and reading the data that will read after complete during from described fifo queue reading out data.
10. the data synchronous system across machine room according to claim 7, it is characterized in that, described for finding corresponding data content according to every index key assignments of described fifo queue from site-local, and carry out the synchronous device of data to each remote site and further comprise:
Index reading is used for reading an index key assignments from the beginning of described fifo queue;
The data content searcher is used for finding corresponding data content according to the index key assignments that reads;
The data content judgment means is used for judging whether the data content that finds is empty;
Instruction sending device is used for the instruction of sending increase, revising or delete corresponding data to remote site;
The operating result receiving system is used for the operating result to described instruction that the receiving remote website feeds back;
The operating result judgment means is used for judging whether the operating result that receives is to operate successfully.
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| CN201110344690.9A CN103095769B (en) | 2011-11-04 | 2011-11-04 | Across method of data synchronization and the system of machine room |
| HK13107590.4A HK1180490A1 (en) | 2011-11-04 | 2013-06-28 | Method and system for synchronizing data crossing machine rooms |
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| CN201110344690.9A CN103095769B (en) | 2011-11-04 | 2011-11-04 | Across method of data synchronization and the system of machine room |
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Also Published As
| Publication number | Publication date |
|---|---|
| HK1180490A1 (en) | 2013-10-18 |
| CN103095769B (en) | 2015-12-09 |
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