CN102184183A - Data synchronization method for distributed database - Google Patents
Data synchronization method for distributed database Download PDFInfo
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- CN102184183A CN102184183A CN 201110079997 CN201110079997A CN102184183A CN 102184183 A CN102184183 A CN 102184183A CN 201110079997 CN201110079997 CN 201110079997 CN 201110079997 A CN201110079997 A CN 201110079997A CN 102184183 A CN102184183 A CN 102184183A
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Abstract
The invention relates to a distributed database and discloses a data synchronization method for the distributed database in order to realize synchronization of data among board cards of embedded equipment and guarantee the consistency of the data of the board cards as well as improve the data synchronization efficiency at the same time. The method comprises the following steps that: a, a source board card transmits operation in the distributed database; b, after receiving the operation transmitted by the source board card, the distributed database of each target board card caches the operation and returns a confirm message to the distributed database of the source board card; c, the distributed database of the source board card receives the confirmation messages of all the target board cards and sends an execution message to the distributed databases of the target board cards; and d, after receiving the execution message, the distributed database of each target board card executes the cached operation and returns an execution result to the distributed database of the source board card. The method is applicable to the synchronization of data among the board cards of the embedded equipment.
Description
Technical field
The present invention relates to distributed data base, relate in particular to a kind of method of data synchronization of distributed data base.
Background technology
Generally comprise main control card and professional ply-yarn drill in the embedded device.Wherein main control card is finished control function, and professional ply-yarn drill is then finished the data forwarding function by specific business interface.In order to improve reliability, generally be equipped with the dual master control card in the present embedded device, be divided into main with main control card and standby main control card; When the master breaks down with main control card, carry out masterslave switchover, standby main control card switches to the main main control card of using, and is responsible for the professional operation of all controls.The master is deployed on the different slots position of embedded device with main control card, standby main control card and service line card division, in system's operational process, the configuration management information of system and routing iinformation etc. generally by main with main control card according to the situation of change real time down to each professional ply-yarn drill and standby main control card; So how to store be a relatively core problem to the data of each integrated circuit board in the embedded device.The applicant has proposed a kind of method that adopts distributed data base to carry out data storage in Chinese patent application " storage means of synchrodata and system in 201110022830.0 distributed network equipments ", promptly the master adopts distributed data base to carry out data storage with main control card, professional ply-yarn drill and standby main control card.
In the embedded device between the integrated circuit board data synchronization be absolutely necessary, promptly need to guarantee the consistance of integrated circuit board data, for adopting distributed data base to carry out the embedded device of data storage, relate to the distribution processor technology of distributed data base.Increase income now or commercial toy data base comprises: mysql, sqlite, fastdb, postgresql or the like, Embedded database is wherein arranged, non-embedded database is also arranged, but relate to all fewer of data distribution reason, generally be confined to back up with the form of file, promptly be that file data after operation is finished copies, in such cases, data synchronization efficiency is low.
Summary of the invention
Technical matters to be solved by this invention is: propose a kind of distributed data base method of data synchronization, to realize the data sync between the embedded device integrated circuit board, guarantee the consistance of integrated circuit board data simultaneously, improve the efficient of data sync.
The present invention solves the problems of the technologies described above the scheme that is adopted: a kind of distributed data base method of data synchronization may further comprise the steps:
A. the source plate card issues the operation in the distributed data base;
B. after the distributed data base of each purpose integrated circuit board receives the operation that the source plate card issues, it is carried out buffer memory, and return acknowledge message to the distributed data base of source plate card;
C. after the distributed data base of source plate card receives the affirmation message of all purpose integrated circuit boards, carry out message to the distributed data base transmission of purpose integrated circuit board;
D. after the distributed data base of each purpose integrated circuit board receives and carries out message, carry out the operation of its buffer memory, and just execution result returns to the distributed data base of source plate card.
Further, distributed data base method of data synchronization of the present invention is further comprising the steps of:
E. the distributed data base of source plate card gathers the execution result of all purpose integrated circuit boards, and the result is announced to each purpose integrated circuit board;
F. the distributed data base of each purpose integrated circuit board is removed the operation in its buffer memory or is sent error check message behind the notice message of the distributed data base that receives the source plate card.
Further, among the step e, after the distributed data base of source plate card gathers the execution result of all purpose integrated circuit boards,, then carry out following operation if judge all purpose integrated circuit board successful execution operations:
E1. the execution result after the distributed data base of source plate card will gather sends to local corresponding application module;
E2. local corresponding application module will return distributed data base to the affirmation message of execution result;
E3. after the distributed data base of source plate card is received the local corresponding affirmation message of application module to execution result, announce the execution result of this operation to each purpose integrated circuit board.
Further, among the step e, after the distributed data base of source plate card gathers the execution result of all purpose integrated circuit boards, if judge have purpose integrated circuit board executable operations mistake to occur, then directly to purpose integrated circuit board announcement execution result.
Further, among the step f, after the distributed data base of all purpose integrated circuit boards receives the notice message of distributed data base of source plate card, if judging has the executable operations of purpose integrated circuit board mistake to occur, then the distributed data base to the source plate card sends error check message, otherwise removes the operation in its buffer memory.
Concrete, after the distributed data base of source plate card received the error check message of all purpose integrated circuit boards, the execution result after will gathering again returned application module, and application module is at first handled mistake, and this operation that issues then terminates.
Further, among the step a, before the source plate card issues the operation in the distributed data base, the source plate card is at first carried out described operation to local database table, if operate successfully, then the operation in the distributed data base is issued, if operation failure does not then operate issuing.
Concrete, each operations control that is issued is furnished with unique sequence number.
Concrete, described source plate card is meant that the master uses main control card, described purpose integrated circuit board comprises professional ply-yarn drill and standby main control card.
Further, in the distribution processor process of distributed data base, if active and standby switching has taken place the source plate card, the source plate card after then switching is carried out following operation:
If there is not the operation that the source plate card before switching issues in the source plate card after g1. switching, the source plate card after then switching sends handoff notification message to the purpose integrated circuit board, and carries the up-to-date sequence of operation number; After each purpose integrated circuit board receives handoff notification message, the described up-to-date sequence of operation number and the local up-to-date sequence of operation number are compared, abandon in the local cache than number new operation of the sequence of operation in the handoff notification message;
If the source plate clamping after g2. switching is received the operation that has the source plate card before switching to issue and is still also carried out, source plate calorie requirement retransmit operation after then switching, the purpose integrated circuit board judges whether respective operations is arranged in the local cache, as denying, then the purpose integrated circuit board distributed data base of preserving this operation and the source plate card after switching is returned acknowledge message, otherwise whether no matter carry out, then the distributed data base of the source plate card after switching is directly returned acknowledge message;
If the source plate card after g3. switching has been carried out operation that the source plate card before switching issues but is unconfirmed, source plate card after then switching sends to the purpose integrated circuit board and carries out message, if judging local respective operations of preserving, also carries out the purpose integrated circuit board, then purpose integrated circuit board executable operations and send executing result message; Carried out but unconfirmed if the purpose integrated circuit board is judged local respective operations of preserving, then the purpose integrated circuit board sends the execution result in the buffer memory;
If the source plate card after g4. switching judges that mistake appears in the execution result of purpose integrated circuit board, the source plate card after then switching sends error message, and the source plate card of purpose integrated circuit board after switching sends error check message;
If the operation that the source plate card after g5. switching is preserved terminates, source plate after then switching is stuck at the beginning of the switching, the operation that issues in the local cache the minimum sequence of operation number and maximum sequence of operation correspondence is to the purpose integrated circuit board, after the purpose integrated circuit board receives operation, abandon the operation of the maximum sequence number that the operation of minmal sequence that sequence number sends less than the source plate card after switching number and sequence number send greater than the source plate card after switching.
The invention has the beneficial effects as follows: realize the data sync between the embedded device integrated circuit board, guarantee the consistance of integrated circuit board data simultaneously, improve the efficient of data sync.
Description of drawings
Fig. 1 is a distributed data base data sync schematic flow sheet of the present invention.
Fig. 2 is that the distributed data base of the embodiment of the invention is distributed the operating process synoptic diagram to a plurality of integrated circuit boards.
Fig. 3 is the treatment scheme synoptic diagram that issues the operation execution error of the embodiment of the invention.
Fig. 4 is that application module calls distributed data bank interface distributing data block diagram among the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and concrete embodiment.
Be confined to backup at the distribution processor of distributed data base in the conventional art with document form, the defective that data synchronization efficiency is low, the present invention proposes a kind of distribution processing method of distributed data base, to realize the data sync between the embedded device integrated circuit board, guarantee the consistance of integrated circuit board data simultaneously, improve the efficient of data sync.Among the present invention, the data of application module on the main control card, be with add or deletion or revise etc. mode of operation enter in the database table of distributed data base, interpolation that application module carries out database table or deletion or retouching operation are issued in a plurality of purpose integrated circuit boards, the data of each purpose integrated circuit board (mainly be meant standby main control card and each professional ply-yarn drill) are also adding or deletion or the mode of operation revised enter in the database table of its distributed data base, and the purpose integrated circuit board is finished after the data sync to the main control card return results.Among the present invention, the entrained information of operation itself that database table is carried out must be buffered in the distributed data base, and operation exists with the form of operation buffer memory, is terminated up to operation.
The process that operation is distributed by distributed data base is divided into two stages:
1. source plate card local database table implementation and operation stage: this stage is that the source plate card is at first carried out associative operation to the database table of local distributed data base, and this is operated and successfully then enters subordinate phase, and operation failure does not then operate issuing.
2. source plate card and purpose integrated circuit board data sync stage: Fig. 1 are the data distributing process synoptic diagram of the distributed data base of the embodiment of the invention, the whole process of issuing of source plate card and purpose integrated circuit board data sync are divided into five stages, that is:
Phase one: source plate card (the promptly main main control card of using) issues operation;
Subordinate phase: after each purpose integrated circuit board (comprising standby main control card, each professional ply-yarn drill) operation that the reception sources integrated circuit board issues, buffer memory is carried out in operation, and the source plate card is returned confirmation of receipt message;
Phase III: the source plate card sends to the purpose integrated circuit board and carries out message;
The quadravalence section: each purpose integrated circuit board is carried out the operation of its buffer memory, and execution result is returned to the source plate card after receiving and carrying out message;
Five-stage: the source plate card is announced each purpose integrated circuit board after gathering all execution results; Each purpose integrated circuit board is removed the operation in its buffer memory after receiving notice message.
Embodiment
In the embodiment of the invention, the source plate card issues operates each purpose integrated circuit board, have the sequence of operation number in the operation that issues, each purpose integrated circuit board receives this operation and buffer memory of having the sequence of operation number, and returns the sequence number of this operation as confirmation of receipt message to this source plate card; After the affirmation message of all purpose integrated circuit boards was received in the source plate clamping, the message that sends executable operations again was to all purpose integrated circuit boards; The purpose integrated circuit board receives from the operation of carrying out its buffer memory after the message of the executable operations of source plate card, and execution result is returned to the source plate card.The distributed data base of source plate card gathers the execution result of all purpose integrated circuit boards, after judging the operation that all successful execution issues of all purpose integrated circuit boards, this operating result is returned to application module, the distributed data base of source plate card provides the results verification interface function for its application module, application module calls this results verification function operating result is confirmed to return to local distributed data base, the distributed data base of source plate card is announced execution result to each purpose integrated circuit board again, and each purpose integrated circuit board is removed the operation in its buffer memory after receiving notice message; So far this data sync completes successfully.In the present embodiment, have unique sequence number in the operation that the source plate card issues for this operated allocated, the operation that promptly issues is issued to each professional ply-yarn drill by main control card, this operation and buffer memory are received in the service line clamping, the context and the sequence number that have comprised operation in this buffer memory are so that recall the result.Professional ply-yarn drill returns sequence number from this operation to main control card is as confirmation of receipt message, and message is carried out in the main control card transmit operation then, and the purpose integrated circuit board receives executable operations, and operating result is returned.
Be that the buffer status of embodiment of the invention source plate card and purpose integrated circuit board and the circulation of operation concern synoptic diagram among Fig. 2.Because interpolation, deletion, retouching operation meeting buffer memory in the distributed data base of source, purpose integrated circuit board itself, in the source plate card, be used for the two states that is cached with that buffer memory issues operation, a kind of state is that distribution is unconfirmed, promptly issuing operation is not identified, the source plate card has issued operates the purpose integrated circuit board, but does not also receive the confirmation of receipt message of all purpose integrated circuit boards; Another kind of state distribution is carried out unconfirmed, promptly is to issue executable operations not to be identified, and the source plate card has issued the message of executable operations to each purpose integrated circuit board, but does not also receive the execution result of all purpose integrated circuit boards.In the purpose integrated circuit board, being used for buffer memory also has two states from the buffer memory of the operation of source plate card, and a kind of state is not receive to carry out, and promptly the purpose integrated circuit board has received the operation that the source plate card sends, but does not also receive the message of executable operations; Another kind of state is to carry out to return unconfirmedly, has carried out operation corresponding to the purpose integrated circuit board, and execution result is sent to the source plate card, but do not received the execution result acknowledge message that the source plate card sends.
But note also having a fault processing mechanism among the present invention, promptly after the distributed data base of source plate card gathers the execution result of all purpose integrated circuit boards, if judge have the executable operations of purpose integrated circuit board mistake to occur, then directly to purpose integrated circuit board announcement execution result.After the distributed data base of all purpose integrated circuit boards received the notice message of distributed data base of source plate card, if judge have the executable operations of purpose integrated circuit board mistake to occur, then the distributed data base to the source plate card sent error check message.The distributed data base of source plate card returns the execution result after current gathering to application module after receiving the error check message of all purpose integrated circuit boards again, and application module is at first handled mistake, and this operation that issues then terminates.Its treatment scheme can be compared the step that normal flow has had more error check referring to Fig. 4, that is: the source plate card is informed error message according to execution result to the purpose integrated circuit board of makeing mistakes, and send error check message to the source plate card after receiving the purpose integrated circuit board of notice message.
If active and standby switching has taken place the main control card as the source plate card in the embodiment of the invention, the source plate card after then switching has 5 states for integrated circuit board in the process of issuing: also do not obtain-＞receive carry out-＞carry out unconfirmed-＞error check-＞operation terminating.After switching was finished, for the flow process of fault processing, the operation buffer memory of the source main control card after the switching can be divided into three little stages, and the phase one remains reception and do not carry out, and subordinate phase can be divided into to be carried out two little stages unconfirmed unconfirmed and wrong.For the consistance that keeps operating, its principle is: when the operation buffer memory of an integrated circuit board was in certain state, the respective operations buffer memory necessarily was in one of three kinds of states in remaining integrated circuit board so: state after the preceding state of this state, this state, this state.Therefore keep the method for data consistent all to return back to preceding state for each integrated circuit board.For example do not carry out from being in reception, then other integrated circuit board should be in and also not obtain or accept not carry out or carry out unacknowledged state.Its concrete treatment scheme is shown in Figure 4: wherein components A is the main control card after switching, and part B is other professional ply-yarn drill,
1. if the operation buffer status of components A is not for also obtaining state, promptly also do not receive operation, then components A sends handoff notification message to part B, and carry the up-to-date sequence of operation number, part B receives handoff notification message, and its up-to-date sequence of operation of carrying number and the local up-to-date sequence of operation number compared, abandon in this locality than number new operation buffer memory of the sequence of operation in the handoff notification message;
2. if the operation buffer status of components A is for receiving not executing state, promptly received operation but also execution, then components A needs retransmit operation, part B is judged the local cache state: if the local cache state is not for also obtaining state, then part B is preserved the operation buffer memory and is sent confirmation of receipt message; If the local cache state is for receiving not executing state, then part B sends confirmation of receipt message; If local cache is for carrying out state unconfirmed, i.e. executable operations but do not receive and confirm to return that then part B sends confirmation of receipt message, but execution result do not remove, receiving subsequently when carrying out message, send the execution result in the buffer memory;
3. if the operation buffer status of components A is for carrying out state unconfirmed, then components A sends and carries out message, and part B is judged the local cache state: if the local cache state is for receiving not executing state, and part B executable operations and send executing result message then; If the local cache state is for carrying out state unconfirmed, then part B sends the execution result in the buffer memory; If the local cache state is the error check state, mistake has appearred during executable operations promptly, and the distributed device of purpose confirms that to mistake then part B sends the execution result in the buffer memory;
4. if the operation buffer status of components A is an error condition, find that promptly mistake appears in the distributed device of purpose when executable operations, then components A sends error message, and part B is judged the local cache state: if the local cache state is execution state unconfirmed, then part B sends error check message; If the local cache state is the error check state, then part B sends error check message; If the local cache state is a final state, the execution result that is about to gather is announced the distributed device of each purpose, and then part B sends error check;
5. if the operation buffer status of components A is a final state, then send the local operation sequence number and finish affirmation by components A at the beginning of switching, components A sends the oldest sequence of operation number in the local cache and the up-to-date sequence of operation number, part B receives the sequence of operation and number does following operation later on: abandon the operation of the oldest sequence number that sequence number sends less than components A, abandon the operation of the latest sequence number that sequence number sends greater than components A.
Claims (10)
1. a distributed data base method of data synchronization is characterized in that, may further comprise the steps:
A. the source plate card issues the operation in the distributed data base;
B. after the distributed data base of each purpose integrated circuit board receives the operation that the source plate card issues, it is carried out buffer memory, and return acknowledge message to the distributed data base of source plate card;
C. after the distributed data base of source plate card receives the affirmation message of all purpose integrated circuit boards, carry out message to the distributed data base transmission of purpose integrated circuit board;
D. after the distributed data base of each purpose integrated circuit board receives and carries out message, carry out the operation of its buffer memory, and just execution result returns to the distributed data base of source plate card.
2. distributed data base method of data synchronization according to claim 1 is characterized in that, also comprises the steps:
E. the distributed data base of source plate card gathers the execution result of all purpose integrated circuit boards, and the result is announced to each purpose integrated circuit board;
F. the distributed data base of each purpose integrated circuit board is removed the operation in its buffer memory or is sent error check message behind the notice message of the distributed data base that receives the source plate card.
3. as distributed data base method of data synchronization as described in the claim 2, it is characterized in that, among the step e, after the distributed data base of source plate card gathers the execution result of all purpose integrated circuit boards,, then carry out following operation if judge all purpose integrated circuit board successful execution operations:
E1. the execution result after the distributed data base of source plate card will gather sends to local corresponding application module;
E2. local corresponding application module will return distributed data base to the affirmation message of execution result;
E3. after the distributed data base of source plate card is received the local corresponding affirmation message of application module to execution result, announce the execution result of this operation to each purpose integrated circuit board.
4. as distributed data base method of data synchronization as described in the claim 2, it is characterized in that, among the step e, after the distributed data base of source plate card gathers the execution result of all purpose integrated circuit boards, if judging has purpose integrated circuit board executable operations mistake to occur, then to purpose integrated circuit board announcement error message.
5. as distributed data base method of data synchronization as described in the claim 2, it is characterized in that, among the step f, after the distributed data base of all purpose integrated circuit boards receives the notice message of distributed data base of source plate card, if judging has the executable operations of purpose integrated circuit board mistake to occur, then the distributed data base to the source plate card sends error check message, otherwise removes the operation in its buffer memory.
6. as distributed data base method of data synchronization as described in the claim 5, it is characterized in that, after the distributed data base of source plate card receives the error check message of all purpose integrated circuit boards, execution result after will gathering again returns application module, application module is at first handled mistake, and this operation that issues then terminates.
7. as claim 1-6 distributed data base method of data synchronization as described in each, it is characterized in that, among the step a, before the source plate card issues the operation in the distributed data base, the source plate card is at first carried out described operation to local database table, if operate successfully, then the operation in the distributed data base is issued, if operation failure does not then operate issuing.
8. as distributed data base method of data synchronization as described in the claim 7, it is characterized in that each operations control that is issued is furnished with unique sequence number.
9. as distributed data base method of data synchronization as described in the claim 8, it is characterized in that described source plate card is meant mainly uses main control card, described purpose integrated circuit board comprises professional ply-yarn drill and standby main control card.
10. as distributed data base method of data synchronization as described in the claim 9, it is characterized in that if active and standby switching has taken place the source plate card, the source plate card after then switching is carried out following operation:
If there is not the operation that the source plate card before switching issues in the source plate card after g1. switching, the source plate card after then switching sends handoff notification message to the purpose integrated circuit board, and carries the up-to-date sequence of operation number; After each purpose integrated circuit board receives handoff notification message, the described up-to-date sequence of operation number and the local up-to-date sequence of operation number are compared, abandon in the local cache than number new operation of the sequence of operation in the handoff notification message;
If the source plate clamping after g2. switching is received the operation that has the source plate card before switching to issue and is still also carried out, source plate calorie requirement retransmit operation after then switching, the purpose integrated circuit board judges whether respective operations is arranged in the local cache, as denying, then the purpose integrated circuit board distributed data base of preserving this operation and the source plate card after switching is returned acknowledge message, otherwise whether no matter carry out, then the distributed data base of the source plate card after switching is directly returned acknowledge message;
If the source plate card after g3. switching has been carried out operation that the source plate card before switching issues but is unconfirmed, source plate card after then switching sends to the purpose integrated circuit board and carries out message, if judging local respective operations of preserving, also carries out the purpose integrated circuit board, then purpose integrated circuit board executable operations and send executing result message; Carried out but unconfirmed if the purpose integrated circuit board is judged local respective operations of preserving, then the purpose integrated circuit board sends the execution result in the buffer memory;
If the source plate card after g4. switching judges that mistake appears in the execution result of purpose integrated circuit board, the source plate card after then switching sends error message, and the source plate card of purpose integrated circuit board after switching sends error check message;
If the operation that the source plate card after g5. switching is preserved terminates, source plate after then switching is stuck at the beginning of the switching, the operation that issues in the local cache the minimum sequence of operation number and maximum sequence of operation correspondence is to the purpose integrated circuit board, after the purpose integrated circuit board receives operation, abandon the operation of the maximum sequence number that the operation of minmal sequence that sequence number sends less than the source plate card after switching number and sequence number send greater than the source plate card after switching.
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| CN108011849B (en) * | 2017-11-29 | 2021-06-08 | 迈普通信技术股份有限公司 | Table entry synchronization method and device |
| CN111478947A (en) * | 2020-03-20 | 2020-07-31 | 珠海高凌信息科技股份有限公司 | Real-time synchronization method and system for main control board and standby control board |
| CN111478947B (en) * | 2020-03-20 | 2023-02-17 | 珠海高凌信息科技股份有限公司 | Method and system for real-time synchronization of main control board and standby control board |
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