CN110674157B - Data caching method based on local area network - Google Patents
Data caching method based on local area network Download PDFInfo
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- CN110674157B CN110674157B CN201910930818.6A CN201910930818A CN110674157B CN 110674157 B CN110674157 B CN 110674157B CN 201910930818 A CN201910930818 A CN 201910930818A CN 110674157 B CN110674157 B CN 110674157B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/23—Updating
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/24—Querying
- G06F16/245—Query processing
- G06F16/2455—Query execution
- G06F16/24552—Database cache management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/185—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with management of multicast group membership
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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
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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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
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
Abstract
The invention relates to the technical field of data updating and discloses a data caching method based on a local area network. The method comprises the following steps: establishing multicast communication by a plurality of computers forming a local area network; the source node computer stores the data to be stored in the memory database, informs other computers in the local area network of the data to be stored through multicast, and establishes a data packet for updating the data; after receiving the update notification, other computers except the source node computer in the local area network inquire whether the same data needs to be stored locally; and if the same data does not exist, inquiring the data needing to be stored in the local area network, establishing a downloading link between the update node computer and the source node computer, and storing the data needing to be stored into a memory database of the update node computer. In the method, as long as at least one computer in the local area network keeps working, the required data is cached, and other computers in the local area network can obtain the required data again after restarting.
Description
Technical Field
The invention relates to the technical field of data updating, in particular to a data caching method based on a local area network.
Background
The existing data storage modes include the following modes: (1) distributed storage, which uses the disk space of each machine in the enterprise through the network, and forms the dispersed storage resources into a virtual storage device, and the data is dispersedly stored in each corner of the enterprise; for example, Hadoop HDFS, objects of OpenStack store Swif, CPHE, etc. (2) Database storage, also called centralized storage, establishes a huge database, stores various information therein, surrounds the information base by various functional modules, and organizes the information base by operations such as inputting, modifying, inquiring, deleting, and the like; such as DB2, oracle, mysql, Redis, etc. (3) The data is cached in the computer memory, and the data is stored by using the computer memory, so that the data is lost when the process exits or is restarted and cannot be persisted. (4) And (4) storing the computer disk, namely storing the data into the computer disk, so that persistence can be achieved.
However, for the above conventional storage system: by adopting a distributed storage system and a database storage system, the system is too large, high in cost, lack of flexibility and not suitable for small-amount data caching; the data is stored by adopting the memory of the local computer, and the data is lost after the current computer is restarted; the local computer disk stores data, and in a computer network which is not suitable for disks (for example, in the internet bar industry, computers are not provided with disks), the data cannot be stored in the disk.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the existing problems, a data caching method based on a local area network is provided.
The technical scheme adopted by the invention is as follows: a data caching method based on a local area network comprises the following processes:
a plurality of computers form a local area network, and multicast communication is established among the computers;
the source node computer stores the data to be stored in the memory database, informs other computers in the local area network of the data to be stored through multicast, and establishes a data packet for updating the data;
after receiving the update notification, other computers except the source node computer in the local area network inquire whether the same data needs to be stored locally; discarding the update notification if there is the same data; if the same data does not exist, inquiring the data needing to be stored in the local area network;
when the source node computer receives the query information of the update node computer, a download link is established between the update node computer and the source node computer, and the data to be stored is stored in the memory database of the update node computer.
Further, the DATA storage format adopts a Key-Value DATA format, Key is a unique identifier of a distributed cache of the whole local area network, 1-128 bits of binary system in a content Value is used for storing an MD5 Value of DATA, 129 bits of binary system is used for storing DATA SIZE SIZE, DATA after 160 bits are used for storing specific DATA DATA, a DATA packet of update DATA established by a source node computer comprises Key and Value, an MD5 Value is obtained by an MD5+ SIZE part DATA of the SIZE and Value through an MD5 algorithm, and update notification DATA of the computer comprises the Key and Value MD5+ SIZE part DATA.
Further, when inquiring whether the same data needs to be stored locally, finding the corresponding data through the key value, and taking out the MD5 value of the corresponding data for comparison to judge.
Further, the data are partitioned according to a certain SIZE, and the updated node and the source node are divided by the certain SIZE through SIZE to obtain the number of the partitioned data; after the data is fragmented, the source node computer provides a plurality of downloading node downloading services according to the number of the data fragments, and meanwhile, the updating node computer establishes downloading links with a plurality of computers according to the data fragments needing to be updated.
Further, when the update node computer is downloaded successfully, the update node computer becomes a source node computer, and a download service is provided for computers other than the source node computer in the local area network.
Further, when a new computer is added in the local area network, a notification message for adding in the network is issued in the local area network through multicast; all computers in the local area network receive the notification message of the new computer and issue the data updating notification of the respective computers; the new computer receives the data updating notice and puts the data updating notice into a task queue; and gradually downloading and updating all data in the new computer-borne task queue.
Further, when a computer prepares to modify a certain Key value, the computer locks the Key value before modification operation, the computer broadcasts the locking message of the Key value to other computers in the local area network, and only the computer modifies the Key value; after the computer writes the modified data, unlocking the key value, and broadcasting the information of unlocking the key value to other computers in the local area network; and then updating the modified data corresponding to the key value in the computer to other computers in the local area network, setting timeout time for locking the key value, usually setting the timeout time to be 5 seconds, and automatically disabling the lock after the timeout so as to avoid the situation that the computer value sends out locking and does not send out unlocking.
Further, when the locking message of the key value is broadcasted, the broadcast information comprises the key value and the IP value of the computer, a priority queue for writing the modified data is set according to the size of the IP value, and when a plurality of computers in the local area network broadcast the locking message of the key value at the same time, the computer with higher priority operates the operation of writing the modified data. The locking states of all machines in the local area network are replaced by the locking states of machines with higher priority;
further, the setting mode of the priority queue is as follows: the smaller the IP value, the higher the priority.
Compared with the prior art, the beneficial effects of adopting the technical scheme are as follows:
the invention establishes a local area network through a router, informs inquiry and establishes a download link through multicast communication, has simple structure and can be used as a basic component to rapidly develop and apply;
2, the invention establishes a local area network through a router, and can cache data without depending on a local disk and a network database through multicast communication; as long as at least one computer in the local area network keeps working at each moment, the needed data is cached, and other computers in the local area network can retrieve the needed data through the scheme of the invention after being restarted. For example, in the application scene of the internet cafe, the data to be saved can be cached in the local area network by the method.
3, the technical scheme of the invention is only used for caching the data of the computer into the network, and has obvious effect; when some stored data is modified, the computer is the same computer in the operation of writing modified data in a locking mode, and the problem of data consistency is avoided;
4, the technical scheme of the invention can write data in a distributed mode with low requirement on data consistency, does not depend on a special storage system, caches data by using idle resources of all computers in a network, and does not depend on whether a single computer can work normally or not.
Drawings
Fig. 1 is a schematic diagram of a data caching method based on a local area network in embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a data storage format in the embodiment of the invention.
Fig. 3 is a schematic diagram of a data caching method in a local area network based on data fragmentation in embodiment 2 of the present invention.
Fig. 4 is a schematic diagram of a local area network data caching method based on source node fission in embodiment 3 of the present invention.
Fig. 5 is a schematic diagram of a local area network-based data caching method with a new computer added in embodiment 4 of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention stores data by using the free memory space of the computer in the network under the condition of not having a centralized storage system, a distributed storage system and a local disk.
Example 1:
as shown in fig. 1, the lan in this embodiment includes 3 computers PC1, PC2, and PC3, but the present invention does not limit the number of computers in the lan. The PC1, the PC2 and the PC3 form a local area network through the router, and can perform multicast communication. Each computer is a peer node in the network, and each node mainly comprises a multicast module, a download service module, a client module and a logic processing module. The multicast module is used for sending a query request, sending an operation locking request and receiving an updating request; the download service module is used for providing a data download server; the client is used for downloading data of other machines; and the logic module is used for generating data MD5 values, storing data, inquiring, updating, maintaining operation queues and other logic processing.
The data caching method in fig. 1:
1) in the local area network of the embodiment, three computers, namely a PC1, a PC2 and a PC3, work.
2) The PC1 is a source node computer, the PC1 needs to store data into a distributed network for caching, and the data needs to be stored into a memory database (memory DB) of the PC1 through a logic module;
the DATA storage format is as shown in fig. 2, a Key-Value DATA format is adopted, Key is a unique identifier of the whole local area network distributed cache, 1-128 bit binary system in content Value is used for storing MD5 Value of DATA, 129-160 bit binary system is used for storing DATA SIZE, DATA after 160 bits are used for storing specific DATA, and a DATA packet of update DATA established by a source node computer comprises Key and Value. The MD5 values were obtained from the SIZE and DATA portions using the MD5 algorithm. The update notification data of the computer contains MD5+ SIZE partial data of Key and value.
3) And sending notification update by multicast to notify PCs 2, 3 and 1 in the local area network that data needs to be stored.
The update data package sent by the PC1 contains only Key, Value MD5 and SIZE data.
When the PC2 and the PC3 receive the update request through the respective multicast modules, the respective logic modules are required to inquire whether the same data needs to be stored locally. Here, the corresponding data is found by the key value, the MD5 value of the corresponding data is extracted and compared to determine, and if they match, the update request is discarded. Otherwise, the PC with the data is inquired in the local area network.
4) When the PC1 receives a returned query request through the multicast module, the respective logic modules of the PC2 and the PC3 inform the respective client PC1 that the data needs to be saved, and the PC2 and the PC3 download the data through the download service module of the respective client linked PC 1.
In the above embodiment, when a plurality of computers are in the local area network and not all the computers can return the query request to the PC1 at the same time, the computer that sends the query request to the PC1 and establishes the download link is updated first.
Example 2:
based on the data caching method of embodiment 1, in order to increase the update speed of data, data is fragmented as shown in fig. 3.
First, in embodiment 2, the PC1 and the PC2 are source node computers at this time, and DATA to be stored is fragmented according to a certain size, in this embodiment, two DATA keys 1 are not fragmented, and the Key2 is fragmented into two pieces of DATA (DATA1, DATA2), but the present invention does not limit the number of fragmented pieces.
Then, data fragmentation is performed according to the data size, for example, Key1 does not need fragmentation, and Key2 is divided into 2 pieces. The updates of Key1 on PC3 are as follows:
PC3 broadcasts query data, data is present for both PC1 and PC 2;
2. the returned query packet contains data Key1, MD5 and SIZE. Key1 is known to have only one data fragment through SIZE;
PC3 receives the response of PC1 first and connects successfully;
4. at the moment, the Key1 only has one fragment, and the data of the Key1 is downloaded from the PC 1;
the data of Key2 on PC3 is updated as follows:
PC3 broadcast query, PC1, PC2, PC4 all have data;
2. the returned query packet contains data Key2, MD5 and SIZE. The fact that Key2 has two data fragments is known through SIZE;
the response sequence received by the PC3 is PC1, PC2 and PC 4;
key2 only has two fragments, abandons the download resource of PC 4;
5PC3 is connected with PC1 to download Key2-DATA1 database, and connected with PC2 to download Key2-DATA2 DATA sheet;
the PC2 provides download service for the PC3 and the PC4 at the same time, and the PC4 queries Key1 for downloading;
example 3:
the download connection provided by the source node limits the number of connection downloads of the source node in order to reduce the additional performance overhead of the computer.
On the basis of the data caching method of embodiment 1 or embodiment 2, the embodiment as in fig. 4 uses a fission mode to update data to the whole local area network more quickly, and the number of connection downloads of the source node is limited to 2. This embodiment has nine computers: PC1, PC2, PC3, PC4, PC5, PC6, PC7, PC8, PC 9. For the first time, the PC1 is the source node computer, and based on the method of embodiment 1 or embodiment 2, the PC1 updates the data to be stored to the PCs 2 and 3; after downloading of the download service is successful in the updating process, the PCs 2 and 3 also become source node computers, and in the second updating process, the PCs 1, 2 and PC3 simultaneously serve as the source node computers, and update data to be stored to the PCs 4, 5, 6, 7, 8 and 9, wherein the PCs 1 update data to the PCs 4 and 9, the PCs 2 update data to the PCs 5 and 6, and the PCs 3 update data to the PCs 7 and 8.
By means of the fission of the embodiment, the data needing to be stored can be quickly updated to the whole local area network.
Example 4:
on the basis of the data caching method in embodiment 1, embodiment 2, or embodiment 3, in order to enable a computer to dynamically join and exit the local area network, a data backup function can also be implemented. And adding a set for automatically updating the whole network data by joining the local area network. The method comprises the following steps:
a) the new computer is PC1, and after joining the LAN, a notification message for joining the LAN is issued by multicast;
b) each computer in PC2, PC3 and PC4 receives the join notification from the new computer side and issues the update notification of the data of the computer;
c) the new PC is PC1 and receives the data update notice of each existing computer PC2, PC3 and PC4, and the notice is put into a task queue;
d) the new PC1 gradually finishes updating all data in the update queue;
example 5:
when some data stored in the local area network needs to be modified, in order to solve the problem of data consistency, on the basis of the data caching method of embodiment 1, embodiment 2, or embodiment 3, the following mechanism is added:
taking four computers (PC1, PC2, PC3, PC4) as an example, when the PC1 prepares to modify a certain Key value, before modification operation, the computer PC1 locks the Key value (only the Key marked as unlocked is the computer can lock the Key and then modify data), the computer broadcasts the locking message of the Key value to other computers in the local area network, and only the PC1 modifies the Key value; after the PC1 writes the modified data, unlocking the key value and broadcasting the unlocking message of the key value to other computers PC2, PC3 and PC4 in the local area network; and then updating the modified data corresponding to the key value in the PC1 to other computers in the local area network in the same way as the method in embodiment 1, embodiment 2 or embodiment 3.
When the PC1 broadcasts the locking message of the key value, the broadcast information comprises the key value and the IP value of the PC1, a priority queue for writing the modified data is set according to the size of the IP value, and when a plurality of computers in the local area network broadcast the locking message of the key value at the same time, the operation of writing the modified data is operated by the computer with higher priority. I.e. if the priority queue is PC1 > PC2 > PC3 > PC4, the modification of the data is handled by PC1 when both PC1 and PC2 are broadcasting lock messages for the key value.
The setting mode of the priority queue is as follows: the smaller the IP value, the higher the priority.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed. Those skilled in the art to which the invention pertains will appreciate that insubstantial changes or modifications can be made without departing from the spirit of the invention as defined by the appended claims.
Claims (8)
1. A data caching method based on a local area network is characterized by comprising the following processes:
a plurality of computers form a local area network, and multicast communication is established among the computers;
the source node computer stores the data to be stored in the memory database, informs other computers in the local area network of the data to be stored through multicast, and establishes a data packet for updating the data;
after receiving the update notification, other computers except the source node computer in the local area network inquire whether the same data needs to be stored locally; discarding the update notification if there is the same data; if the same data does not exist, inquiring the data needing to be stored in the local area network;
when the source node computer receives the query information of the update node computer, a download link is established between the update node computer and the source node computer, and the data to be stored is stored in a memory database of the update node computer;
the DATA storage format adopts a Key-Value DATA format, Key is a unique identifier of a distributed cache of the whole local area network, 1-128-bit binary system in a content Value is used for storing an MD5 Value of DATA, 129-160-bit binary system is used for storing a DATA SIZE SIZE, DATA after 160 bits are used for storing specific DATA DATA, a DATA packet of update DATA established by a source node computer comprises the Key and the Value, the MD5 Value is obtained by an MD5 algorithm from the SIZE and DATA parts, and update notification DATA of the computer comprises MD5+ SIZE part DATA of the Key and the Value.
2. The local area network-based data caching method as claimed in claim 1, wherein when the local is queried whether the same data needs to be stored, the corresponding data is found through a key value, and the MD5 value of the corresponding data is extracted for comparison to determine.
3. The local area network-based data caching method of claim 1, wherein data is fragmented according to a certain SIZE, and the update node and the source node are divided by the certain SIZE to obtain the number of fragments; after the data is fragmented, the source node computer provides a plurality of downloading node downloading services according to the number of the data fragments, and meanwhile, the updating node computer establishes downloading links with a plurality of computers according to the data fragments needing to be updated.
4. The local area network-based data caching method as recited in claim 1, wherein, when the update node computer is successfully downloaded, the update node computer becomes the source node computer, providing download services to computers other than the source node computer in the local area network.
5. The local area network-based data caching method as claimed in claim 1, wherein when a new computer is added to the local area network, a notification message for joining the network is issued in the local area network by multicast; all computers in the local area network receive the notification message of the new computer and issue the data updating notification of the respective computers; the new computer receives the data updating notice and puts the data updating notice into a task queue; and gradually downloading and updating all data in the new computer-borne task queue.
6. The local area network-based data caching method as claimed in claim 1, wherein when a computer is ready to modify a certain key value, the computer locks the key value before modification, the computer broadcasts a locking message of the key value to other computers in the local area network, and only the computer modifies the key value; after the computer writes the modified data, unlocking the key value, and broadcasting the information of unlocking the key value to other computers in the local area network; then updating the modified data corresponding to the key value in the computer to other computers of the local area network; and setting timeout time for locking the key value, wherein the locking is automatically disabled after the timeout.
7. The local area network-based data caching method according to claim 6, wherein when the lock message of the key value is broadcasted, the broadcast information includes the key value and an IP value of the computer, a priority queue for writing the modified data is set according to the size of the IP value, and when a plurality of computers in the local area network simultaneously broadcast the lock message of the key value, the operation of writing the modified data is operated by a computer with higher priority.
8. The local area network-based data caching method of claim 7, wherein the priority queue is set in a manner that: the smaller the IP value, the higher the priority.
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