CN103095769B - Across method of data synchronization and the system of machine room - Google Patents
Across method of data synchronization and the system of machine room Download PDFInfo
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Abstract
This application discloses a kind of method of data synchronization across machine room, comprise request processing method and the remote synchronization method of parallel processing.In described request processing method, site-local process request, and be that the data creation occurring to change is used for unique index key assignments of locating, and add described index key assignments to a fifo queue.In described remote synchronization method, site-local is according to the index key assignments in described fifo queue, and the data content finding corresponding generation to change, sends synchronic command to each remote site.Disclosed herein as well is the data synchronous system across machine room corresponding with it.The application has that time of delay is short, the stand-by period is short, consumption of natural resource is low, the data syn-chronization of remote site remains correct feature.
Description
Technical field
The application relates to a kind of method of data synchronization and system.
Background technology
For data safety backup or the object such as access speed improving various places user, multiple website is disposed in some the Internet standing-meetings in different location, as shown in Figure 1.Wherein each website is a station server or the cluster that is made up of multiple servers.Require between these websites to keep data syn-chronization, to make wherein stored data content consistent.
Shown in Fig. 1 across in the multi-site deployment scheme of machine room, when requesting party's 1 pair of website 1 is filed a request, website 1 is as site-local, and all the other websites are all as remote site.And when requesting party's 2 pairs of websites 2 are filed a request, website 2 is as site-local, all the other websites are all as remote site.That is, site-local and remote site carry out distinguishing according to each spot of asking.
In order to realize data syn-chronization between the multi-site across machine room, the method adopted at present has following two kinds:
First method adopts synchronous data transmission, as shown in Figure 2.Requesting party files a request to site-local.Described request can be one or more in the operations such as the increase of data, amendment or deletion.Site-local is according to this request of action type process.After site-local successfully processes this request, forward this request to remote site with the form of synchronization message.Described synchronization message has such feature: transmit leg, after being sent, will block the process of himself, until receive the response to this synchronization message, just continues other task of process downwards.Site-local waits for that remote site returns result, and after all remote sites all return the result of " successfully processing described request ", site-local returns the result of " successfully processing described request " to requesting party.
The time of delay of the method for data synchronization across machine room shown in Fig. 2 is long, and the stand-by period of requesting party is long.And due to cross-region unstable networks, easily cause the blocking of the response sending or receive synchronization message, even cause the application service of site-local seemingly-dead.In actual applications, seldom adopt in this way.
Second method adopts simultaneous asynchronous data transmissions, as shown in Figure 3.Requesting party files a request to site-local.Described request comprises the increase of data, amendment, deletion action.This request of site-local process.After site-local successfully processes this request, forward this request to remote site with the form of asynchronous message.Described asynchronous message has such feature: transmit leg, after being sent, need not wait for the response of this asynchronous message, just can continue to process other task downwards.After site-local has successfully forwarded this request, site-local has just returned the result of " successfully processing described request " to requesting party.In actual applications, mostly adopt in this way.
The method of data synchronization across machine room shown in Fig. 3, because the result without the need to waiting for remote site can return requesting party, thus reduces the stand-by period of time of delay and requesting party.But due to reasons such as networks, asynchronous message may be caused to transmit unsuccessfully, cause the data of remote site there is no synchronized update.
In addition, shown in Fig. 3 across in the data transmission method of machine room, due to the timing of each asynchronous message cannot be ensured, may occur that legacy data covers the situation of new data.Attempt an example to illustrate, refer to Fig. 4:
In the t1 moment, site-local changes the value of data D1 into a1 by a0, sends the value of asynchronous message M1 synchronous vacations data D1 to other remote sites simultaneously.
In the t2 moment afterwards, site-local changes the value of data D1 into a2 by a1, sends the value of asynchronous message M2 synchronous vacations data D1 to other remote sites simultaneously.
Because asynchronous message M1, M2 do not have the priority of sequential.Remote site R1 may first receive asynchronous message M2 in the t3 moment afterwards, thus changes the value of data D1 into a2 by a0.
Then in the t4 moment afterwards, remote site R1 have received again asynchronous message M1, thus changes the value of data D1 into a1 by a2.
Now remote site R1 place just there occurs the situation covering new data a2 with legacy data a1, and this is incorrect.
Above-mentioned two kinds of methods, all can not solve the data synchronization problems across machine room effectively.And no matter be that site-local all needs the copy holding this request, thus wastes a large amount of memory sources, causes the problems such as inefficiency with synchronization message or with the form Forward-reques of asynchronous message.
Summary of the invention
The application provides a kind of method of data synchronization across machine room based on FIFO (first-in first-out) queue, while guarantee has shorter time of delay, guarantees that data correctly transfer to remote site and upgrade.For this reason, the application also will provide a kind of data synchronous system across machine room corresponding with it.
For solving the problems of the technologies described above, the application, across the method for data synchronization of machine room, comprises request processing method and the remote synchronization method of parallel processing;
In described request processing method, site-local process request, and be that the data creation occurring to change is used for unique index key assignments of locating, and described index key assignments is added to a fifo queue;
In described remote synchronization method, site-local is according to the index key assignments in described fifo queue, and the data content finding corresponding generation to change, sends synchronic command to each remote site;
Described request processing method comprises the steps:
A1 walks, and site-local obtains increase, amendment that requesting party proposes or deletes the request of data;
A2 walks, this request of site-local process;
A3 walks, and after site-local successfully processes this request, for there is the data creation index key assignments changed, this index key assignments is used for navigating to uniquely the data occurring to change;
A4 walks, and described index key assignments is put into the end of a fifo queue by site-local, and described fifo queue is made up of the index key assignments of the data increasing, revise or delete; If this fifo queue does not exist, then create this fifo queue.
The application comprises across the data synchronous system of machine room:
For in site-local process request, and set up an index key assignments for uniquely locating for the data occurring to change, and described index key assignments is added to the device of a fifo queue;
For storing the device of described fifo queue;
For finding corresponding data content according to the every index key assignments in described fifo queue from site-local, and send the device of synchronic command to each remote site;
Described in site-local process request, and set up an index key assignments for uniquely locating for the data occurring to change, and the device that described index key assignments adds a fifo queue to is comprised further:
Request receiving device, for receiving the request that requesting party increases, revises or delete data;
Request processing unit, for increasing specific data according to received request, revise or delete;
Index creation device, for for after newly increasing, revising or the data creation index key assignments deleted;
Index writing station, for created index key assignments being put into the end of a fifo queue, if there is no this fifo queue then creates a fifo queue;
Operating result dispensing device, for sending to requesting party by the operating result of described request.
The application has short feature time of delay across the method for data synchronization of machine room and system.This is that just can return result to requesting party, and this fifo queue is stored in site-local, thus the stand-by period of requesting party is short because site-local only needs the index key assignments of the data of change to be submitted to a fifo queue.
The application introduces a fifo queue across in the data synchronous system of machine room and method thereof, and it is that the index key assignments data changed occurring by site-local is formed, and can be considered the data syn-chronization task list of site-local and remote site.Because the data content of actual generation change is not preserved in this queue, and the index key assignments of the data changed just occurs, the storage resources thus consumed, computing resource etc. are all lower.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the site deployment across 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 the flow chart of existing another kind across the method for data synchronization (simultaneous asynchronous data transmissions) of machine room;
Fig. 4 is the schematic diagram of makeing mistakes of the method for data synchronization across machine room shown in Fig. 3;
Fig. 5 is the total schematic diagram of the application across the method for data synchronization of machine room;
Fig. 6 is that the application is across the flow chart processing requesting method in the method for data synchronization of machine room;
Fig. 7, Fig. 8 are all the application's flow charts across method of data synchronization in the method for data synchronization of machine room;
Fig. 9, Figure 10 are the schematic diagram of the application across method of data synchronization in the method for data synchronization of machine room;
Figure 11 is the total schematic diagram of the application across the data synchronous system of machine room;
Figure 12 is the concrete schematic diagram of the application across the data synchronous system of machine room.
Embodiment
Refer to Fig. 5, the application comprises two parts across the method for data synchronization of machine room, and Part I is process request, and Part II is that teledata is synchronous, and these two parts are parallel processing, namely can process simultaneously.
In described request processing method, site-local process request, and be that the data creation occurring to change is used for unique index key assignments of locating, and add described index key assignments to a fifo queue.Described index key assignments preferably adopts the logical address that the data changed occur, and namely uniquely can be located a kind of index that the data changed occur by relations such as mapping, correspondences.
Such as, the pieces of data stored in Database Systems all at least comprises major key ID and data content two parts, and the major key ID of every bar data does not repeat.To the major key ID of the data changed be there is as index key assignments in the application.This Typical Representative is wherein Key-Value database, the key of the data changed can occur as index key assignments.
And for example, the pieces of data stored in file system represents a file all respectively, and comprising there being filename (comprising absolute path), and the All Files name (comprising absolute path) in file system does not repeat.To the filename of the data changed be there is as index key assignments in the application.This is equally applicable to the website adopting distributed storage.If website adopts distributed storage, and the filename on different server may repeat, can also be common as index key assignments using the server identification and filename (comprising absolute path) that the data changed occur.
If what index key assignments adopted is the physical address that the data changed occur, namely it is at the physical storage address of site-local, and so it is to be noted that once 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 made up of described index key assignments.Described fifo queue is exactly the task list that site-local needs to carry out to each remote site data syn-chronization, and each index key assignments wherein just represents a data syn-chronization task from site-local to remote site.If described fifo queue does not exist, then create this fifo queue.
In described remote synchronization method, site-local is according to the index key assignments in described fifo queue, and the data content finding corresponding generation to change, sends synchronic command to each remote site.Described synchronic command comprises increase, amendment or deletes data.
Refer to Fig. 6, this is an embodiment of the method for described process request, comprises the steps:
A1 walks, and requesting party files a request to site-local.Described request can be increase, the operation such as amendment or deletion of data.
A2 walks, this request of site-local process, namely increases, revises or data specified by removal request side.
A3 walks, and after site-local successfully processes this request, for changing a data creation index key assignments of (namely increase, revise or delete), this index key assignments is used for navigating to uniquely the data occurring to change.
A4 walks, and described index key assignments is put into the end of a fifo queue by site-local.Preferably, be added after fifo queue at described index key assignments, site-local returns the result of " successfully processing described request " to requesting party.
Refer to Fig. 7, Fig. 8, this is an embodiment of the method for described data syn-chronization, comprises the steps:
B1 walks, and site-local reads an index key assignments from the beginning of described fifo queue.
If successfully read an index key assignments, then enter b2 step.Due to the self-characteristic of fifo queue, after this index key assignments is read, just from described fifo queue deleted fall.
If do not read index key assignments, then represent that described fifo queue is for empty, shows the current data syn-chronization task that do not have further, return b1 step.
B2 walks, and site-local finds the data occurring to change according to read index key assignments.Such as find data content according to major key ID in a database, or find file content according to filename (comprising absolute path) in file system.
If the data content occurring to change is empty, then what the data that expression occurs to change were carried out is deletion action, then this index key assignments is transferred to remote site and sends the synchronic command deleting corresponding data by site-local.After remote site receives this synchronic command, find corresponding data according to index key assignments, and this data content is deleted.Because site-local is consistent with the Stored Data Type of each remote site, therefore all corresponding data content can be navigated to uniquely at an index key assignments at each website.
If the data content occurring to change is not empty, then represent occur change data carry out be increase or retouching operation, site-local by this index key assignments and occur change data content transmission to remote site and send increase or amendment corresponding data synchronic command.
B3 walks, and site-local waits for the result of remote site.
The result that if remote site returns " processing successfully ", then return b1 step.
The result that if remote site returns " processing unsuccessfully ", then read index key assignments is re-applied to the end of described fifo queue by site-local, and returns b1 step.
The application efficiently solves the correctness problem of the data syn-chronization of remote site across the method for data synchronization of machine room.Below attempt two example explanations.
Refer to Fig. 9, this is the embodiment of the application across the method for data synchronization of machine room.
In the t1 moment, site-local changes the value of data D1 into a1 by a0, simultaneously to the index key assignments DD1 of the end increase data D1 of fifo queue.
In the t2 moment after a while, site-local changes the value of data D1 into a2 by a1, simultaneously again to the index key assignments DD1 of the end second time increase data D1 of fifo queue.
In the t3 moment, site-local reads the index key assignments DD1 that first time puts into fifo queue, finds the value of data D1.The t3 moment is inevitable after instant tl, and before being engraved in the t2 moment during this example assumes t3, then now the value of data D1 is a1.Site-local is a1 to the initiate a message value of Update Table D1 of other remote sites, until obtain the successfully modified confirmation of each remote site.
In the t4 moment after a while, site-local reads the index key assignments DD1 that second time puts into fifo queue, finds again the value of data D1.The t4 moment is inevitable after instant t 2, and now the value of data D1 is a2, and site-local initiates a message the value of Update Table D1 to a2, until obtain the successfully modified confirmation of each remote site to other remote sites again.
Refer to Figure 10, this is the application's another embodiment across the method for data synchronization of machine room, is only: the t3 moment after instant t 2 with the difference of Fig. 9.Now site-local successively sends two message to other remote sites, is all that the value of Update Table D1 is a2, does not also occur the situation that data syn-chronization is made mistakes.
From above two examples, the application is across the method for data synchronization of machine room, to the data syn-chronization of change be there is to that moment of remote site in site-local, only pay close attention to the final state of the data that this moment transmits, and any change occurred before being indifferent to these data, thus can not there is the situation that the legacy data shown in Fig. 4 covers new data.
Refer to Figure 11, the application comprises across the data synchronous system of machine room:
For in site-local process request, and set up an index key assignments for uniquely locating for the data occurring to change, and described index key assignments is added to the device 51 of a fifo queue;
For storing the device 52 of described fifo queue;
For finding corresponding data content according to the every index key assignments in described fifo queue from site-local, and send the device 53 of synchronic command to each remote site.
The above-mentioned data synchronous system across machine room needs to arrange each website in FIG.In addition, the database 550 storing pieces of data is also all comprised at each website.
Refer to Figure 12, described device 51 comprises further:
Request receiving device 511, for receiving the request of the data processing of requesting party; Described data processing request can be the data processing operations such as increase, amendment or deletion;
Request processing unit 512, for according to receives ask specific data is processed;
Index creation device 513, for the data creation index key assignments for process;
Index writing station 514, for by the index key assignments that creates or receive be put into the end of a fifo queue, if there is no this fifo queue, then create a fifo queue;
Operating result dispensing device 515, for sending to requesting party by the operating result of described request.
Described device 52 comprises further:
FIFO storage device 520, for storing described fifo queue;
FIFO control device 521, for when new data writes described fifo queue, new data is placed on the end of described fifo queue, when reading data from described fifo queue, data are read from the beginning of described fifo queue, and after reading, the data read are deleted from described fifo queue.
Described device 53 comprises further:
Index reading 531, for reading an index key assignments from the beginning of described fifo queue;
Data content search device 532, for finding corresponding data content according to read index key assignments;
Data content judgment means 533, for judging whether found data content is empty;
Instruction sending device 534, for sending the synchronic command of corresponding data to remote site;
Operating result receiving system 535, for receiving the operating result to described instruction of remote site feedback;
Operating result judgment means 536, for judging whether received operating result is successful operation.
These are only the preferred embodiment of the application, and be not used in restriction the application.For a person skilled in the art, the application can have various modifications and variations.Within all spirit in the application and principle, any amendment done, equivalent replacement, improvement etc., within the protection range that all should be included in the application.
Claims (8)
1. across a method of data synchronization for machine room, it is characterized in that, comprise request processing method and the remote synchronization method of parallel processing;
Described request processing method comprises the steps:
A1 walks, and site-local obtains increase, amendment that requesting party proposes or deletes the request of data;
A2 walks, this request of site-local process;
A3 walks, and after site-local successfully processes this request, for there is the data creation index key assignments changed, this index key assignments is used for navigating to uniquely the data occurring to change;
A4 walks, and described index key assignments is put into the end of a fifo queue by site-local, and described fifo queue is made up of the index key assignments of the data increasing, revise or delete; If this fifo queue does not exist, then create this fifo queue;
In described remote synchronization method, site-local is according to the index key assignments in described fifo queue, and the data content finding corresponding generation to change, sends synchronic command to each remote site.
2. the method for data synchronization across machine room according to claim 1, is characterized in that, described remote synchronization method comprises the steps:
B1 walks, and site-local reads an index key assignments from the beginning of described fifo queue;
If successfully read an index key assignments, then enter b2 step;
If do not read index key assignments, then return b1 step;
B2 walks, and site-local finds the data content occurring to change according to read index key assignments;
If the data content occurring to change is empty, then this index key assignments is transferred to remote site and sends the synchronic command of deletion by site-local;
If the data content occurring to change be empty, then site-local by this index key assignments, there is the data content transmission that changes to remote site and send the synchronic command increasing or revise;
B3 walks, and site-local waits for the result of remote site;
The result that if remote site returns " processing successfully ", then return b1 step;
The result that if remote site returns " processing unsuccessfully ", then read index key assignments is re-applied to the end of described fifo queue by site-local, and returns b1 step.
3. the method for data synchronization across machine room according to claim 1, is characterized in that, described index key assignments is the major key ID of every bar data in Database Systems.
4. 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.
5. the method for data synchronization across machine room according to claim 1, is characterized in that, described synchronic command comprises increase, amendment or deletes the instruction of data.
6. across a data synchronous system for machine room, it is characterized in that, comprising:
For in site-local process request, and set up an index key assignments for uniquely locating for the data occurring to change, and described index key assignments is added to the device of a fifo queue;
For storing the device of described fifo queue;
For finding corresponding data content according to the every index key assignments in described fifo queue from site-local, and carry out the device of data syn-chronization to each remote site;
Described in site-local process request, and set up an index key assignments for uniquely locating for the data occurring to change, and the device that described index key assignments adds a fifo queue to is comprised further:
Request receiving device, for receiving the request that requesting party increases, revises or delete data;
Request processing unit, for increasing specific data according to received request, revise or delete;
Index creation device, for for after newly increasing, revising or the data creation index key assignments deleted;
Index writing station, for created index key assignments being put into the end of a fifo queue, if there is no this fifo queue then creates a fifo queue;
Operating result dispensing device, for sending to requesting party by the operating result of described request.
7. the data synchronous system across machine room according to claim 6, is characterized in that, the described device for storing described fifo queue comprises further:
FIFO storage device, for storing described fifo queue;
FIFO control device, for new data being placed on when new data writes described fifo queue the end of described fifo queue, reading data from the beginning of described fifo queue when reading data from described fifo queue and after reading, the data read being deleted from described fifo queue.
8. the data synchronous system across machine room according to claim 6, it is characterized in that, described for finding corresponding data content according to the every index key assignments in described fifo queue from site-local, and comprise further to the device that each remote site carries out data syn-chronization:
Index reading, for reading an index key assignments from the beginning of described fifo queue;
Data content search device, for finding corresponding data content according to read index key assignments;
Data content judgment means, for judging whether found data content is empty;
Instruction sending device, for sending increase, revising or delete the instruction of corresponding data to remote site;
Operating result receiving system, for receiving the operating result to described instruction of remote site feedback;
Operating result judgment means, for judging whether received operating result is successful operation.
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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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| CN104618219A (en) * | 2014-12-30 | 2015-05-13 | 北京奇虎科技有限公司 | Cross-machine-room data synchronizing method and device |
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