CN1808394A - Soft co-standby method based on memory database - Google Patents
Soft co-standby method based on memory database Download PDFInfo
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- CN1808394A CN1808394A CN 200610038374 CN200610038374A CN1808394A CN 1808394 A CN1808394 A CN 1808394A CN 200610038374 CN200610038374 CN 200610038374 CN 200610038374 A CN200610038374 A CN 200610038374A CN 1808394 A CN1808394 A CN 1808394A
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Abstract
Disclosed is a method for soft dual-computer based on memory database comprising: 1) each application program on host server saves business data in host server memory database via calling application interface (API), respectively writing into incremental data area and full data area; 2) data synchronizing process on the host server sends the incremental data in the memory database of the host server to data synchronizing process of backup machine with form of data flow via socket; 3) the data synchronizing process of backup machine writes the received data into the full data area of backup machine memory database; 4) above step 1 to step 3 complete data backup between host and backup machines, and the synchronization is completed when the incremental data in host server memory database is null.
Description
Technical field
The present invention relates to the method for two-node cluster hot backup, especially the server two-shipper is based on the soft co-standby method of memory database.
Background technology
Present server dual-locomotive heat has two kinds of typical modes, a kind of is the mode based on disk array of standard of comparison, two-server is by a shared memory device (generally being disk array or the storage area network SAN that shares), and deposit data is on the memory device of sharing.When master server is managed business, directly on memory device, read and write.After master server broke down switching, standby server read the data on this memory device too, realized two-node cluster hot backup.Another kind of mode is the mode by pure software, be commonly referred to as pure software mode or mirror image mode (Mirror), incremental data on the master server disk is copied in real time on the disk of another station server by mirror image software, just each exists a same like this data on the disk of two-server, if master server breaks down, can in time switch to standby server.
The pure software mode has the following advantages:
1. avoided the Single Point of Faliure of disk array:, itself promptly be to take precautions against, but disk array has exactly formed a new single-point again because the fault of individual equipment causes service disruption for two-node cluster hot backup.(such as, the safety factor of server is 99.9%, the safety factor of disk array is 99.95%, and then the safety factor of pure soft two-shipper is 1-99.9% * 99.9%=99.99%, then can be a little less than 99.95% based on the safety factor of the Dual-Computer Hot-Standby System of disk array.
2. save investment: need not buy expensive disk array.
3. be not subjected to the restriction of distance: two-server need not be subjected to scsi cable length restriction (disk array of optical-fibre channel is not subjected to distance limit yet, but the investment be so great that many).Like this, deployment server comprises that the distance by physical location improves security (disaster tolerance) more neatly.
More than the common drawback of disk mode of Jie Shaoing and pure software mode is exactly all can't accomplish to be equipped with mutually for the business datum in the active/standby server internal memory, and at some to the demanding business application system of handling property (as Online Charging System OCS, its response time requirement to each Pen Association's word＜200ms), therefore a large amount of business processing data are stored in the internal memory, and active and standby machine hinders for some reason and must not influence current ongoing business when switching, and so just must guarantee the synchronous of active and standby machine internal storage data.
Summary of the invention
The present invention seeks to, propose a kind of method for synchronous of active and standby machine internal storage data,, can't realize the data synchronization problems in the internal memory and propose at existing double-machine standby technology especially based on the soft co-standby method of memory database.
Technical solution of the present invention is:
One, system of the present invention forms based on following parts:
1. the application aip interface on the active/standby server
2. the memory database on the active/standby server (data separation is incremental data district and full dose data field)
3. the data synchronizing process on the active/standby server
Two, technical solution of the present invention is:
Based on the soft co-standby method of memory database, 1. each application program deposits business datum in the master server memory database in by calling application api interface on master server, writes respectively in incremental data district and the full dose data field;
2. data synchronizing process sends to the form of data stream the incremental data in the master server memory database data synchronizing process of guest machine on the master server by socket;
3. the data synchronizing process of guest machine writes the data that receive in the full dose data field in the guest machine memory database.
4. the heat that above 1-3 step has been finished data between once active and standby machine is equipped with, and shows between two-server synchronous fully when the incremental data of master server memory database is sky.
This characteristic feature of an invention and main advantage are:
1. data centralization: all data that need heat be equipped with all are kept in the memory database.
2. heat is equipped with the efficient height: adopt increment storehouse scheme to guarantee real-time, heat is equipped with a time＜=5ms
3. cold standby efficient height: adopt full dose storehouse scheme, time＜=10s of cold standby is specifically referring to drawings and Examples.(annotate: the TimesTen that adopts ORACLE company is as memory database)
The actual use shows that the heat of finishing a business datum based on the soft two-shipper technology of memory database is equipped with time＜=5ms, finishes cold standby time＜=10s one time.
Description of drawings
Fig. 1 is the double machine structure synoptic diagram of memory database of the present invention.
Fig. 2 is that the present invention's heat is equipped with the processing procedure scene sequential chart under the scene
Fig. 3 is the processing procedure scene sequential chart under the cold standby scene of the present invention
Embodiment
One, heat is equipped with the processing procedure under the scene: (as shown in the figure)
1. the application process on the master server is by in the memory database that calls the api interface and business datum is write this machine (being written to respectively in incremental data district and the full dose data field)
2. the data synchronizing process on the master server reads an incremental data in this machine memory database, is sent to the data synchronizing process of guest machine, sends successfully this incremental data of back deletion.This step cycle is handled no datat to the incremental data district.
3. the data synchronizing process of guest machine writes the data that receive in the memory database of this machine (only writing in the full dose data field).This step cycle is handled to no datat and is received.
Two, the processing procedure under the cold standby scene:
1. master server breaks down, and guest machine is enabled.
2. the application process on the guest machine is by in the memory database that calls the api interface and business datum is write this machine (being written to respectively in incremental data district and the full dose data field)
3. master server is restarted successfully, and the data synchronizing process on the master server sends the data synchronizing process of a cold standby request to guest machine.
4. the data synchronizing process of guest machine is received the cold standby request, with the locking of guest machine memory database, empty incremental data, and the data file of memory database is duplicated portion, release memory database then is sent to duplicated data file the data synchronizing process of master server.
5. the data synchronizing process of master server is replaced the current data file of this machine with the data file that receives.
6. beginning heat is equipped with scene ... scene sequential chart with reference to the accompanying drawings.
The present invention adopts Socket to the invention provides abundant method and the attribute of a cover.The Socket class allows use agreement to carry out asynchronous and synchronous data transmission.The Socket class is followed the .NET Framework naming scheme of asynchronous method; Be applicable to synchronous mode of operation:
If that current use is Connection-oriented Protocol (as TCP), then server can use the Listen method to intercept connection.
AcceptMethod is handled any connection request that imports into, and returns the Socket that can be used for carrying out with distance host data communication.Can use this Socket that returns to call
SendOr
ReceiveMethod.If specify local ip address and port numbers, please calling
ListenCall earlier before the method
BindMethod.If never call
Bind, infrastructure service provides program to distribute these values for you.After this, can use
LocalEndPointAttribute comes identification distribution to give IP address and the port numbers of Socket.Intercept main frame if want to be connected to, please call
ConnectMethod.If will carry out data communication, please call
SendOr
ReceiveMethod.
If will use independent thread process communication in the process of implementation, adopt the method that is applicable to the asynchronous operation pattern.
If that current use is Connection-oriented Protocol (as TCP), then can use Socket,
BeginConnectWith
EndConnectMethod connects intercepts main frame.By using
BeginSendWith
EndSendMethod is perhaps used
BeginReceiveWith
EndReceiveMethod can be carried out asynchronous data communication.Can use
BeginAcceptWith
EndAcceptThe connection request that processing is imported into.If a socket is carried out a plurality of asynchronous operations, they not necessarily the order when starting finish.When data send and after Data Receiving finishes, can use
ShutdownMethod is forbidden Socket.After calling Shutdown, can call
CloseMethod discharges all resources related with Socket.The Socket class allows to use
SetSocketOptionMethod disposes Socket.Can use
GetSocketOptionMethod is retrieved these settings.
Claims (4)
1, based on the soft co-standby method of memory database, it is characterized in that adopting following method: 1). each application program deposits business datum in the master server memory database in by calling application api interface on master server, writes respectively in incremental data district and the full dose data field; 2). data synchronizing process sends to the form of data stream the incremental data in the master server memory database data synchronizing process of guest machine on the master server by socket; 3). the data synchronizing process of guest machine writes the data that receive in the full dose data field in the guest machine memory database, 4). the heat that above 1-3 step has been finished data between once active and standby machine is equipped with, and shows between two-server synchronous fully when the incremental data of master server memory database is sky.
2. by the described soft co-standby method of claim 1 based on memory database, it is characterized in that application process on the master server is by after in the memory database that calls the api interface and business datum is write this machine, its synchronized process reads an incremental data in this machine memory database, be sent to the data synchronizing process of guest machine, send successfully this incremental data of back deletion; This step cycle is handled no datat to the incremental data district.
3. by the described soft co-standby method based on memory database of claim 2, the data synchronizing process that it is characterized in that guest machine writes the data that receive in the full dose data field of memory database of this machine; This step cycle is handled to no datat and is received.
4, by claim 1 or 2 described soft co-standby methods based on memory database, it is characterized in that master server breaks down, guest machine is enabled; Application process on the guest machine writes business datum in the memory database of this machine by calling the api interface, and is written to respectively in incremental data district and the full dose data field; Master server is restarted successfully, and the data synchronizing process on the master server sends the data synchronizing process of a cold standby request to guest machine; The data synchronizing process of guest machine is received the cold standby request, with the locking of guest machine memory database, empty incremental data, and the data file of memory database is duplicated portion, release memory database then is sent to duplicated data file the data synchronizing process of master server; The data synchronizing process of master server is replaced the current data file of this machine with the data file that receives.
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| CN102262591A (en) * | 2010-05-31 | 2011-11-30 | 国际商业机器公司 | Garbage collection method and system for memory copy system |
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Address after: 210013 No. 16 building, world window software park, No. 12 Huai gate, Jiangsu, Nanjing Patentee after: Asialnfo Technology (Nanjing) Co., Ltd. Address before: 210013 No. 16 building, world window software park, No. 12 Huai gate, Jiangsu, Nanjing Patentee before: LINKAGE-ASIAINFO TECHNOLOGIES (NANJING), INC. |