CN107026880A - Method of data synchronization and device - Google Patents
Method of data synchronization and device Download PDFInfo
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- CN107026880A CN107026880A CN201610069972.5A CN201610069972A CN107026880A CN 107026880 A CN107026880 A CN 107026880A CN 201610069972 A CN201610069972 A CN 201610069972A CN 107026880 A CN107026880 A CN 107026880A
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- Prior art keywords
- transaction journal
- transaction
- storage
- snapshot
- repeater
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
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- Computer Networks & Wireless Communication (AREA)
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- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
Abstract
The invention provides method of data synchronization and device.Method of data synchronization includes：To repeater request transaction daily record, if asked transaction journal is not present in repeater, to snapshot server request transaction daily record；Transaction journal is received from repeater or snapshot server；And applied transaction daily record is with synchrodata.
Description
Technical field
The present invention relates to computer network field, and in particular to a kind of method of data synchronization and dress
Put.
Background technology
The popularization used with internet, and the service of the Internet, applications 7*24 whole days are natural
Attribute, the availability of website is more and more important to Large-Scale Interconnected net company.Even if a few minutes delay
Machine is likely to bring about great losses to Internet firm and user.Website is caused to be delayed the factor of machine
Mainly include server, the network equipment, computer room, ISP network circuit, weather natural calamity etc.
Force majeure.Redundancy is the major way for lifting Website Usability.Usual Large-Scale Interconnected net company
Important web station system will be deployed to multiple servers, multiple computer rooms, multiple cities, very
To the whole world.For data system, under more stable reliable network environment, Wo Menyi
As reproduction technology in itself that provided using database realize data redundancy.When network environment becomes
When unstable, the reproduction technology that database itself is provided often does not reach enough robustnesses；And
And sufficiently low duplication delay can not be provided.Therefore, in the network environment across computer room, cross-region
In, how a kind of database synchronous system of low delay High Availabitity is provided, just turns into and improves available
The key of property.
One of prior art is Mysql Replication, i.e. Mysql leader follower replications.Mysql
Duplication is a kind of master-slave synchronisation technology that (log shipping) is transmitted based on transaction journal.Work as master
When having affairs write-in on server, Transaction Information is first write transaction journal (Write by master server
Ahead Log) in, the data change that transaction packet contains then is performed again, changes data file.
Performed from server after the operation for specifying master server, run IO threads from server, even
Master server is connect, to master server request transaction log transmission.From the IO threads on server
The transaction journal received is write to local transaction log file (relay log).From server
SQL threads are run simultaneously, local transaction log file is read, and perform included in affairs one by one
Data change, data file of the final write-in from server.
Another prior art is Oracle Golden Gate.This be it is a kind of support Oracle,
The reproduction technology of the multitype databases such as Mysql.It is similar with Mysql in its principle, it is also based on
Transaction journal is transmitted, and main difference is that Oracle Golden Gate are with third party's component
Mode is run, independently of Database Systems in deployment.
But, all there is more obvious shortcoming in both technologies.Mysql leader follower replication technologies
Using widely in daily database O＆M, be primarily due to this reproduction technology by
Mysql itself is directly provided, it is not necessary to install any tripartite's component；It is simple using upper comparison in addition
It is single.But, Mysql replicates the place denounced always and is that replication performance.Until
Mysql5.6, Mysql just start to optimize replication performance.Further, since Mysql is multiple
System is provided by Mysql itself, and peripheral system can not be intervened, and also can not just realize that such as isomery is answered
The Premium Features such as system, bidirectional replication, message distribution.Oracle Golden Gate are due to Oracle
Good support, in traditional industrial application such as telecommunications, banks than wide.But its commercial product
Attribute, determines limited autgmentability, it is impossible to adapt to that Internet firm's demand is complicated and changeable to be made
Use scene.
The content of the invention
In view of this, the invention provides a kind of method of data synchronization and dress of low delay High Availabitity
Put.It improves the performance that Mysql is replicated, and is replicated with Mysql compared to 5-10 times of raising.Meanwhile,
The present invention provides the framework spirit transmitted by transaction journal and carry out data change distribution from design
Activity.
First aspect is there is provided a kind of method of data synchronization according to an embodiment of the invention, including：
To repeater (Relay) request transaction daily record, if transaction journal can not be received from repeater,
Then to snapshot server request transaction daily record；From repeater or snapshot (Snapshot) server
Receive transaction journal；And applied transaction daily record is with synchrodata.
Second aspect, additionally provides a kind of data synchronization unit according to an embodiment of the invention,
Including：Request unit, is configured as to repeater request transaction daily record, if can not be from relaying
Device receives transaction journal, then to snapshot server request transaction daily record；Receiving unit, is configured
To receive transaction journal from repeater or snapshot server；And transaction journal applying unit, quilt
Applied transaction daily record is configured to synchrodata；And applying unit, it is configured as receiving and answers
With the transaction journal with synchrodata.
Brief description of the drawings
Fig. 1 is the schematic diagram for showing data syn-chronization center according to an embodiment of the invention.
Fig. 2 is the flow chart for showing method of data synchronization according to an embodiment of the invention.
Fig. 3 is to show to be used for the flow of the method for snapshot server according to an embodiment of the invention
Figure.
Fig. 4 is the block diagram for showing data synchronization unit according to an embodiment of the invention.
Embodiment
The present invention replicates identical from general principle with Mysql, is all by by primary database
Transaction journal be transferred to from database, be then applied to one by one from database.The present invention is logical
Height parallelization is crossed to improve from database side storage algorithm, so as to improve replication performance.
Fig. 1 shows the schematic diagram at data syn-chronization center according to an embodiment of the invention.Data are same
Step center is mainly made up of three components：Repeater (Relay), snapshot (Snapshot) is multiple
Device (Replicator) processed.The core work flow of whole system is as follows：
(1) Relay extracts transaction journal from data source, is put into Circular buffer (Ring Buffer)
In, it is used as internal memory journal queue；
(2) Replicator sets up with Relay and connected, the online change (Online Transfer) of request,
Ask one section of Incremental Transactions daily record；
(3) Relay takes out corresponding transaction journal block from Ring Buffer, is sent to
Replicator；
(4) Replicator is received after transaction journal, is set up and is connected with target database, and applies
Transaction journal；
(5) if Relay does not find corresponding transaction journal block in 1.3, just send and do not find
Notify (for example, 404) to Replicator；
(6) Replicator is received do not find and notify 404 after, set up and connect with Snapshot, please
Seek quickness according to increment (Snapshot Delta)；
(7) Snapshot takes out corresponding snapshot increment from its memory, is sent to
Replicator；
(8) Replicator is received after snapshot increment, is set up and is connected with target database, and applies
Transaction journal；
(9) during 2-8, Snapshot as a Relay special consumption terminal, always
All online changes are being subscribed to from Relay, and are being write in memory, Relay data are used as
Standby when expired；
Primary clustering repeater (Relya) of the invention explained below, reproducer
And snapshot (Snapshot) (Replicator).
1st, repeater (Relay)
Repeater Relay extracts transaction journal from source database, and Replicator is provided
Daily record subscription service, role is upper equivalent to Mysql Slave IO Thread.Relay is in design
Source database is connected in single thread mode, affairs are used as using Circular buffer (Ring Buffer)
The data structure of daily record storage, it is ensured that reading performance；In addition for the database of big writing,
Relay can also use memory mirror file to be stored as transaction journal, it is ensured that can receive foot
Enough high writing.
Relay workflow is as follows：
1.1Event Producer threads are set up to data source and connected, and initiating transaction journal extraction please
Ask, persistently pull transaction journal；
1.2Event Producer are parsed the transaction journal pulled, according to fixed in advance
The avro schema of justice, sequence chemical conversion avro forms；
The avro forms of transaction journal are added in Ring Buffer by 1.3Event Producer；
If 1.4 reach the checkpoint time intervals specified, Event Producer will be current
Have been written into Ring Buffer maximum transaction log-sequence numbers write-in checkpoint；
2nd, reproducer (Replicator)
Replicator is the consumption terminal of transaction journal, and affairs are pulled from Relay or Snapshot
Daily record, target database is applied to by transaction journal by the uniformity of configuration, role it is upper equivalent to
Mysql Slave SQL Thread。
Replicator can be configured according to uniformity, flexibly select storehouse, table, row etc. at different levels
The storage algorithm of degree of parallelism；For the write-in of large batch of continuous data, submitted using batch.
Replicator additionally provides unified transaction journal consumption interface, eliminates and data source affairs day
The coupling of will form.
Replicator main working process is as follows：
2.1Relay Puller threads are set up with Relay and connected, and subscribe to transaction journal, and will receive
To transaction journal write-in Ring Buffer in；
2.2Dispatcher takes out the transaction journal block of batch from Ring Buffer, according to one
The configuration of cause property, is grouped to transaction journal, is merged, generating the processing such as storage sentence, being sent
To callback threads；
2.3Callback thread pools, are configured according to uniformity, to the storage sentence of packet, are performed
It is parallel to submit；
2.4 when Relay Puller threads receive 404 from Relay in 2.2.2.1, then initiate
Snapshot Puller threads are sent to Snapshot and subscribe to request, and affairs are received from Snapshot
After daily record, remaining process step is continued executing with；
After 2.5 each Callback threads run succeeded, successful Transaction Sequence number will be had been filed on
Write the corresponding checkpoint of thread；
3rd, snapshot (Snapshot)
Snapshot (Snapshot) is responsible for subscribing to all transaction journals from Relay, and write-in is persistently deposited
Storage is as snapshot, while providing batch daily record subscription service to Replicator, role is upper suitable
In Mysql Slave Relay Log.
As it was previously stated, under normal circumstances, Replicator is directly connected to Relay, Relay is consumed
Transaction journal in memory queue.But in some cases, because network jitter, object library it is negative
High factor was carried, Replicator may be caused to fall behind with respect to Relay a lot.In addition, working as
When new consumption terminal adds the subscriber of same data source, the problem of new consumption terminal has cold start-up.
In order to avoid doing full dose snapshot from data source again, Snapshot is special as one of Relay
Consumption terminal, by a kind of high consumption pattern handled up, endlessly consumes online from Relay
Transaction journal, by effective processing to transaction journal, finally saves the portion one of data source
Snapshot is caused, that is, includes the snapshot of the last state in the table of data source storehouse per a line, is retained simultaneously
The transaction journal than Relay Buffer longer of one backtracking time.
Snapshot mainly includes Snapshot increments flow and Snapshot snapshot workflows.
Snapshot incremental workflow journeys are as follows：
3.1 when Replicator sends to Snapshot and subscribes to request, and Snapshot is checked please
The initialization transaction log-sequence numbers in parameter are sought, if initialization transaction log-sequence numbers are worked as in Snapshot
In the range of preceding transaction journal storage (Log Store), then start snapshot increment flow；
3.2Snapshot Server read a transaction journal block from transaction journal storage, send
To Replicator；
3.3 repeat 3.2, until having consumed all daily records in transaction journal storage；
3.4 at this moment, and Replicator has pulled up to Relay, and then Replicator connects again
Relay is met, continues to consume online change；
Snapshot snapshot workflows are as follows：
3.1 when Replicator sends to Snapshot and subscribes to request, and Snapshot is checked please
The initialization transaction log-sequence numbers in parameter are sought, if initialization transaction log-sequence numbers are not in Snapshot
In current transaction journal memory range, then start snapshot transfer process；
3.2Snapshot Server read a transaction journal block from snapshot storage, are sent to
Replicator；
3.3 repeat 3.2, until having consumed all daily records in snapshot storage；
3.4Replicator continues to ask Snapshot, into snapshot incremental workflow journey.
In addition, present invention also offers High Availabitity design, including：
4.1 checkpoints (Checkpoint) mechanism is to provide transaction journal in whole system
Safety in production and the guarantee of consumption.In order to ensure checkpoint across machine, the height across computer room
Availability, we select Zookeeper as checkpoint memory mechanisms.Zookeeper makes
With across computer room deployment mechanism, it is ensured that checkpoint is available across computer room.
4.2Relay as high performance transaction journal transfer, for ensureing whole system
Low delay is extremely important end to end.In order to ensure Relay high availability, we select
Zookeeper realizes Relay Active-Standby Failover mechanism.
In addition, the present invention also provides a general api interface, three method, systems are facilitated to subscribe to master
Data change on database.
Fig. 2 is the flow chart for showing method of data synchronization 200 according to an embodiment of the invention.
Methods described 200 can be performed in Replicator.
In step 201, to repeater request transaction daily record.Step 202, repeater is judged
With the presence or absence of the transaction journal asked.If there is asked transaction journal in repeater,
Then in step 204, transaction journal is received from repeater.Asked if be not present in repeater
Transaction journal, in step 203 to snapshot server request transaction daily record, then in step 204
Transaction journal is received from snapshot server.In step 205, applied transaction daily record is with synchrodata.
Fig. 3 is to show to be used for the method 300 of snapshot server according to an embodiment of the invention
Flow chart.
In step 301, snapshot server receives transaction journal request from Replicator.In step
Rapid 302, judge to whether there is asked transaction journal in transaction journal storage.If affairs
There is asked transaction journal in daily record storage, then sent in step 303 to Replicator
The transaction journal.If asked transaction journal is not present in transaction journal storage,
In step 304, transaction journal is obtained from snapshot storage, and the thing is sent to Replicator
Business daily record.
Fig. 4 is the block diagram for showing data synchronous system 400 according to an embodiment of the invention.Institute
Stating data synchronization unit 400 includes：Request unit 401, is configured as asking thing to repeater
Business daily record, if transaction journal can not be received from repeater, to snapshot server request transaction
Daily record；Receiving unit 402, is configured as receiving transaction journal from repeater or snapshot server；
And applying unit 403, transaction journal is configured to apply with synchrodata.
To sum up, the present invention is parallel by the data structure and consumption terminal of a kind of distributed memory queue
The optimized algorithm of storage, can be provided across low delay under computer room, cross-region scene, High Availabitity
Database synchronization mechanism.
Claims (10)
1. a kind of method of data synchronization, including：
To repeater request transaction daily record, if asked affairs day are not present in repeater
Will, then to snapshot server request transaction daily record；
Transaction journal is received from repeater or snapshot server；And
Applied transaction daily record is with synchrodata.
2. according to the method described in claim 1, wherein the Transaction Information is stored in repeater
In caching, and if there is no asked transaction journal in repeater caching, then from repeater
Notice is not found in reception.
3. method according to claim 1 or 2, wherein the transaction journal is also stored in
In the transaction journal storage of snapshot server and snapshot storage, and if in transaction journal storage
In find asked transaction journal, then from transaction journal storage receive transaction journal, if
Asked transaction journal is not found in transaction journal storage, then receives affairs from snapshot storage
Daily record.
4. method according to claim 3, wherein the snapshot storage is non-volatile deposits
Reservoir.
5. according to the method described in claim 1, in addition to：
The transaction journal of reception is stored in reproducer caching,
Packet, merging, generation storage sentence processing are performed to transaction journal according to uniformity configuration,
Storage sentence is performed using call back function thread according to uniformity configuration and submitted parallel, with
And
After each call back function thread runs succeeded, successful transaction journal sequence will be had been filed on
Number corresponding checkpoint of write-in.
6. a kind of data synchronization unit, including：
Request unit, is configured as to repeater request transaction daily record, if can not be from repeater
Transaction journal is received, then to snapshot server request transaction daily record；
Receiving unit, is configured as receiving transaction journal from repeater or snapshot server；And
Applying unit, is configured to apply transaction journal with synchrodata.
7. data synchronization unit according to claim 6, wherein the Transaction Information is preserved
In repeater caching, and
If the receiving unit is additionally configured to do not have asked affairs in repeater caching
Daily record, then receive from repeater and do not find notice.
8. the device according to claim 6 or 7, wherein the transaction journal is also stored in
In the persistently storage of the transaction journal storage of snapshot server and snapshot, and if in transaction journal
Asked transaction journal is found in storage, then receives transaction journal from transaction journal storage, such as
Fruit does not find asked transaction journal in transaction journal storage, then stores and receive from snapshot
Transaction journal.
9. device according to claim 8, wherein the snapshot storage is non-volatile deposits
Reservoir.
10. device according to claim 6, the applying unit is additionally configured to：
The transaction journal of reception is stored in reproducer caching,
Packet, merging, generation storage sentence processing are performed to transaction journal according to uniformity configuration,
Storage sentence is performed using call back function thread according to uniformity configuration and submitted parallel, with
And
After each call back function thread runs succeeded, successful transaction journal sequence will be had been filed on
Number corresponding checkpoint of write-in.
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| CN201610069972.5A CN107026880A (en) | 2016-02-01 | 2016-02-01 | Method of data synchronization and device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109189748A (en) * | 2018-08-20 | 2019-01-11 | 郑州云海信息技术有限公司 | A kind of buffer consistency processing method and nfs server |
| CN109358817A (en) * | 2018-10-26 | 2019-02-19 | 北京百度网讯科技有限公司 | Methods, devices and systems for replicate data |
| CN110019062A (en) * | 2017-08-14 | 2019-07-16 | 北京京东尚科信息技术有限公司 | Method of data synchronization and system |
| CN111930693A (en) * | 2020-05-28 | 2020-11-13 | 武汉达梦数据库有限公司 | Transaction merging execution method and device based on log analysis synchronization |
| CN111930692A (en) * | 2020-05-28 | 2020-11-13 | 武汉达梦数据库有限公司 | Transaction merging execution method and device based on log analysis synchronization |
| CN113190528A (en) * | 2021-04-21 | 2021-07-30 | 中国海洋大学 | Parallel distributed big data architecture construction method and system |
| CN114297291A (en) * | 2021-12-09 | 2022-04-08 | 武汉达梦数据库股份有限公司 | Transaction combination-based parallel execution method and device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110019062A (en) * | 2017-08-14 | 2019-07-16 | 北京京东尚科信息技术有限公司 | Method of data synchronization and system |
| CN109189748A (en) * | 2018-08-20 | 2019-01-11 | 郑州云海信息技术有限公司 | A kind of buffer consistency processing method and nfs server |
| CN109358817A (en) * | 2018-10-26 | 2019-02-19 | 北京百度网讯科技有限公司 | Methods, devices and systems for replicate data |
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| CN111930693A (en) * | 2020-05-28 | 2020-11-13 | 武汉达梦数据库有限公司 | Transaction merging execution method and device based on log analysis synchronization |
| CN111930692A (en) * | 2020-05-28 | 2020-11-13 | 武汉达梦数据库有限公司 | Transaction merging execution method and device based on log analysis synchronization |
| CN111930692B (en) * | 2020-05-28 | 2022-05-13 | 武汉达梦数据库股份有限公司 | Transaction merging execution method and device based on log analysis synchronization |
| CN111930693B (en) * | 2020-05-28 | 2024-02-06 | 武汉达梦数据库股份有限公司 | Transaction merging execution method and device based on log analysis synchronization |
| CN113190528A (en) * | 2021-04-21 | 2021-07-30 | 中国海洋大学 | Parallel distributed big data architecture construction method and system |
| CN113190528B (en) * | 2021-04-21 | 2022-12-06 | 中国海洋大学 | Parallel distributed big data architecture construction method and system |
| CN114297291A (en) * | 2021-12-09 | 2022-04-08 | 武汉达梦数据库股份有限公司 | Transaction combination-based parallel execution method and device |
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