CN108804446A - A kind of data retrieval method and system - Google Patents
A kind of data retrieval method and system Download PDFInfo
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- CN108804446A CN108804446A CN201710291397.8A CN201710291397A CN108804446A CN 108804446 A CN108804446 A CN 108804446A CN 201710291397 A CN201710291397 A CN 201710291397A CN 108804446 A CN108804446 A CN 108804446A
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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
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
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Abstract
A kind of data retrieval method of offer of the embodiment of the present invention and system, network server carries out term according to preset rules to be processed into satisfactory inquiry field, and the corresponding inquiry request of the inquiry field is sent to agent node；The agent node determines the query node for handling the inquiry request according to the inquiry request and the mark of the query node is sent to the network server；The inquiry request is sent to the query node by the network server；Query result is sent to the network server by the query node after being inquired according to the inquiry request.
Description
Technical field
The present invention relates to computer realm more particularly to a kind of data retrieval method and systems.
Background technology
The speed of development of modern scientific technology is getting faster, and new Sci-tech Knowledge and information content rapidly increase.British scholar
James 〃 Martins count, the multiplication period of human knowledge, 19th century be 50 years, 20th century first half leaf be 10 years or so, arrive
It shorten to 5 years the seventies, has almost arrived every 3 years degree doubled the end of the eighties.In recent years, the whole world is delivered daily
Paper is up to 13000~14000, and the new patent registered every year is up to 700,000, and the books published every year are up to more than 50 ten thousand kinds.New reason
By, the emergence of new material, new process, new method, aging of knowledge speed is made to accelerate.According to statistics, a people is grasped
Knowledge half-life period is 80~90 years in 18th century, and 19th~20 century were 30 years, and 1960's is 15 years, into the eighties,
It shorten to 5 years or so.It was further reported the output of whole world printing information doubles for every 5 years,《The New York Times》One week information
Measure the summation that is, the information content that the 17th century scholar can touch lifetime.In the past 30 years, the information of human being's production has surpassed
Cross over the summation of Infomiation Production in 5000.
With the fast development of science and technology, information resources are more and more huger, also increasingly fragmentation, this retrieval side to data
More stringent requirements are proposed for formula.The information of such magnanimity is retrieved, the processing capacity of existing centralization search engine
Than relatively limited, have the following problems：Every retrieval request is handled by server, is required server hardware condition very high.
Invention content
A kind of data retrieval method of offer of the embodiment of the present invention and system can solve every retrieval of the existing technology
Request is handled by server, to the exigent problem of server hardware condition.
To solve the above-mentioned problems, the embodiment of the present invention provides a kind of data retrieval method, including：
Network server carries out term according to preset rules to be processed into satisfactory inquiry field, and is looked into described
It askes the corresponding inquiry request of field and is sent to agent node；
The agent node according to the inquiry request determines query node for handling the inquiry request and by institute
The mark for stating query node is sent to the network server；
The inquiry request is sent to the query node by the network server；
Query result is sent to the network server by the query node after being inquired according to the inquiry request.
Optionally, further include before the method：
The query node searches agent node and the network service is added by the agent node after succeeding in registration
Device.
Optionally, agent node is searched after the query node succeeds in registration and the net is added by the agent node
Network server, including：
The query node reads configuration file, searches the address of the agent node publication, generates and saved to the agency
The reference agency of point；
The query node determines whether to have been added to the network server according to the feedback information of agent node.
Optionally, the method further includes：
The query node periodically sends heartbeat message according to predetermined period to the agent node；
The agent node updates the state of the query node according to the heartbeat message.
Optionally,
The query node periodically sends heartbeat message according to predetermined period to the agent node, including：
The query node is sent to the agent node after current state information is encapsulated into the heartbeat message；
The agent node updates the state of the query node according to the heartbeat message, including：
The agent node is according to the shape of query node described in the state information updating for including in the heartbeat message
State；If more than the heartbeat message that N number of predetermined period does not receive the query node, the agent node deletes the inquiry section
The log-on message of point, the N are positive integer.
The embodiment of the present invention also provides a kind of data retrieval system, including：
Network server is processed into satisfactory inquiry field for carrying out term according to preset rules, and will
The corresponding inquiry request of the inquiry field is sent to agent node；
The agent node, for being determined according to the inquiry request for handling the query node of the inquiry request simultaneously
The mark of the query node is sent to the network server；
The network server is additionally operable to the inquiry request being sent to the query node；
The query node takes for query result to be sent to the network after being inquired according to the inquiry request
Business device.
Optionally, the query node is additionally operable to：Agent node is searched after succeeding in registration and is added by the agent node
Enter the network server.
Optionally, the query node is specifically used for：
Configuration file is read, the address of the agent node publication is searched, the reference to the agent node is generated and acts on behalf of；
Determined whether to have been added to the network server according to the feedback information of agent node.
Optionally,
The query node is additionally operable to：According to predetermined period periodically heartbeat message is sent to the agent node；
The agent node is additionally operable to：The state of the query node is updated according to the heartbeat message.
Optionally,
The query node is specifically used for：The generation is sent to after current state information is encapsulated into the heartbeat message
Manage node；
The agent node is specifically used for：It is inquired according to described in the state information updating for including in the heartbeat message
The state of node；If more than the heartbeat message that N number of predetermined period does not receive the query node, the query node is deleted
Log-on message, the N are positive integer.
A kind of data retrieval method provided in an embodiment of the present invention and system, network server will be retrieved according to preset rules
Word carries out being processed into satisfactory inquiry field, and the corresponding inquiry request of the inquiry field is sent to agent node；
The agent node determines the query node for handling the inquiry request according to the inquiry request and saves the inquiry
The mark of point is sent to the network server；The inquiry request is sent to the query node by the network server；
Query result is sent to the network server by the query node after being inquired according to the inquiry request.By above
Scheme reduces the workload of network server, reduces the requirement to server.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The purpose of the present invention and other advantages can be by specification, rights
Specifically noted structure is realized and is obtained in claim and attached drawing.
Description of the drawings
Attached drawing is used for providing further understanding technical solution of the present invention, and a part for constitution instruction, with this
The embodiment of application technical solution for explaining the present invention together, does not constitute the limitation to technical solution of the present invention.
Fig. 1 is a kind of flow diagram of data retrieval method provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of data retrieval system provided in an embodiment of the present invention.
Specific implementation mode
Technical scheme of the present invention is described in detail below in conjunction with accompanying drawings and embodiments.
It should be noted that if do not conflicted, each feature in the embodiment of the present invention and embodiment can be tied mutually
It closes, within protection scope of the present invention.In addition, though logical order is shown in flow charts, but in certain situations
Under, it can be with the steps shown or described are performed in an order that is different from the one herein.
Hierarchical architecture of the embodiment of the present invention based on distributed search engine, the framework are respectively physics from the bottom up
Layer, level of abstraction, application layer and expression layer, wherein：
Physical layer provides the data source of total, is the basis for constituting total, is mainly used for receiving from pumping
As the retrieval request of layer, the data retrieval request task of each search engine itself is completed, and the standard heartbeat of system is believed
Breath is sent to application layer after being encapsulated by level of abstraction, and (heartbeat message refers to physical layer regularly by the Information Number of network exchange
According to packet), update its status information in application layer.Physical layer be by several be distributed in isomorphism in different geographical or environment or
The synthesis of isomerization unit search engine composition a, distributed comprehensive search engine.Each unit searches engine is one
A independent, autonomous search node, and its distribution can also be dynamic change.All unit searches engines cooperate with
To provide retrieval service for level of abstraction.Therefore, level of abstraction does not specifically depend on a certain specific unit searches engine, not yet
Dependent on the processing capacity of discrete cell search engine, it can according to actual demand, gear to actual circumstances different type number
According to being deployed on different unit searches engines, the data of the type are specifically optimized.
Level of abstraction is an abstract global data Layer, it is responsible for receiving the retrieval request from application layer, according to list
Inquiry request is encapsulated as the acceptable parameter of unit searches engine by the isomerism of META Search Engine, is relayed to unit searches and is drawn
It holds up, these parameters include：(1) data type of query word, query word can be self-defined or uses simple data type；(2) it rises
Beginning document code；(3) number of files etc. that one query obtains.When unit searches engine returns to retrieval result, level of abstraction is to inquiry
As a result it is handled, obtains following information：Title (title) and the relevant grid abstract of query word etc..Level of abstraction will obtain again
Information be submitted to application layer carry out page results output processing.In addition, level of abstraction is also responsible for disappearing between physical layer and application layer
The format conversion of message communication, it is convenient to be provided to the operation of related data, shields the access details of data, is provided to application consistent
Data source and facilitate unified access interface.By defining a level of abstraction, user requires no knowledge about each unit of access and searches
Index the grammer held up.In addition, if one of unit searches engine is replaced or physically reconstructs, the application of application layer can not
With modification.If correctly devising this layer, so that it may to accomplish to isolate application program from complicated isomeric data.
Application layer is the core layer of entire framework, and all applications are completed in this layer.Application layer is mainly used for providing
The user interface of data application.This layer receives the request of user and related request of data is forwarded to level of abstraction, while right
The result that level of abstraction returns submits to expression layer again after carrying out result fusion and Optimal scheduling.The application layer is by network server
Composition, is mainly responsible for the forwarding of user's Query Information and the fusion of query result, while being also responsible for management each unit search and drawing
The survival condition held up runs the front end page of distributed search engine, and the work such as clustering are carried out to search result.
Expression layer is the system entry of user, usually web browser, provides friendly access entry and knot to the user
Fruit shows the page.
Above-mentioned decker, in hierarchical organization's form of hierarchical system, each layer all provides service to last layer, to it
Lower layer then requires to be serviced.Using this organizational form, it is easy to get many good characteristics：It can support software abstract layer
Secondary growth；It can effectively support the upgrading and reuse of software, and can support soft in the big granularity in level rank
Part reuses.In distributed environment, the storage mode of data and the position of storage are different, to handle having for the overall situation well
Pass problem separates programming personnel from the complexity of multilayered model, can separate into the memory mechanism of data
For a mew layer-- level of abstraction.The separation of level of abstraction not only eliminates such as connecing of being faced when handling multiple data sources
The trouble of mouth, agreement etc. also shields the variation of system bottom data model structure and position.In actual application, also need
The service of resource consolidation is provided, if some are put forward one layer of composition in relation to the problem of resource consolidation, is not only avoided that
Correlation when programming also provides convenience and practicability in reuse and upgrading for one application system of construction.
Based on above-mentioned framework, an embodiment of the present invention provides a kind of data retrieval methods, as shown in Figure 1, this method includes：
Step 102, network server carry out term according to preset rules to be processed into satisfactory inquiry field, and
The corresponding inquiry request of the inquiry field is sent to agent node.
Illustratively, network server is a container, and network server is also carried out in addition to the front end page of operating system
Search result, i.e., be organized into some thematic classifications by the cluster work of search result.Agent node and query node are answered
It is the core of distributed search engine system with the application server in layer.
Step 104, the agent node determine the inquiry section for handling the inquiry request according to the inquiry request
The mark of the query node is simultaneously sent to the network server by point.
Illustratively, agent node is the scheduling node of distributed search engine system top, be responsible for be entirely
System, and realize function below：
1, the inquiry request of network server output is received；
2, the registration request for receiving query node manages and safeguards its status information；Status information is mainly by three fields
Composition：Existing state (state), the utilization rate (cpu used) of processor and the utilization rate (memoryused) of memory；
3, query task distribution is carried out, an inquiry is selected according to the state (processor and internal storage state) of each query node
Node responds current queries request, and selection result is sent to network server, then sends inquiry request by network server
To corresponding query node.
Since agent node is the total scheduling node of distributed search engine system, it is responsible for the state letter of whole system
Breath, so the higher operation of Time & Space Complexity should not all be completed in agent node, in order to avoid there is bottleneck problem, and
If agency is broken down because of load excessive, entire distributed search engine system can also paralyse, so what agency provided
Application interface function is also relatively simple, only provides query node selection service to network server.When receiving network server
Inquiry distribution request when, agent node according to query word call node state management module query node selection operation, obtain
It takes the query node telereference of a survival and returns to network server.The backup node of increase agent node can be passed through
With the robustness of strengthening system.
The inquiry request is sent to the query node by step 106, the network server.
Illustratively, multiple queries node composition inquiry proxy pond, multiple queries node concurrently respond user's inquiry, pass through
Using multiple queries node, solves while responding generated bottleneck problem when a large amount of requests.Query node is searched as distribution
The Centroid of rope automotive engine system realizes function below：
1, it is interacted with agent node：The working node state updating information of one side Receiving Agent node forwarding is gone forward side by side
Row is safeguarded；On the other hand periodically status information is sent to agent node；
2, the distribution of query task：The inquiry request of network server is received, the hit results returned after inquiry disappear
Weight, the processing operation merged, by treated, result is sent to network server, and user is showed by network server, with
Complete primary retrieval task.
Query node is also classified into network layer, logical layer and application layer.The major function of network layer is the friendship with agent node
Mutual communication includes the working node more new state of Receiving Agent node transmission, and actively sends heart beat status letter to agent node
Breath.Logical layer is mainly responsible for the design and realization of query node internal logic function；Include mainly working node manager and looking into
Ask two parts of node background work thread pool.Working node manager is responsible for the survival condition information of maintenance work node, week
Phase checks the status information of working node, deletes the working node that time-out goes offline with failure, the work that Receiving Agent node is sent
Node state updates.Query node background work thread pool is mainly responsible for periodically reports the state letter of itself to agent node
Breath, and periodically check each working node state and reported to agent node.
It is mainly responsible for the merging work of the distribution and query result of inquiry request due to query node, coordinates each work section
Point carries out distributed retrieval work, is a most important ring in distributed search engine system, so its load is also bigger,
Requirement to its stability is also relatively high, thus take the inquiry proxy pond being made of multiple queries node solve stability and
Bottleneck problem, the design of query node three-tier architecture improve the scalability, fault-tolerance and handling capacity of system.
Query result is sent to the net by step 108, the query node after being inquired according to the inquiry request
Network server.
Optionally, can also include before the method：
Step 100, the query node search agent node and by described in agent node additions after succeeding in registration
Network server.
Optionally, step 100 may include：
The query node reads configuration file, searches the address of the agent node publication, generates and saved to the agency
The reference agency of point；
The query node determines whether to have been added to the network server according to the feedback information of agent node.
Optionally, the method can also include：
Step 110, the query node periodically send heartbeat message according to predetermined period to the agent node；
Step 112, the agent node update the state of the query node according to the heartbeat message.
Optionally,
Step 110, it can specifically include：After current state information is encapsulated into the heartbeat message by the query node
It is sent to the agent node；
Step 112, it can specifically include：
The agent node is according to the shape of query node described in the state information updating for including in the heartbeat message
State；If more than the heartbeat message that N number of predetermined period does not receive the query node, the agent node deletes the inquiry section
The log-on message of point, the N are positive integer.
Illustratively, each working node and query node send the time interval 10 seconds of heartbeat message to agent node
(i.e. predetermined period is 10 seconds).The agent node thinks that the time that working node and query node time-out go offline is set as 4 (N
=4) a heart beat cycle, i.e., 40 seconds.Heartbeat sending cycle and time-out time are set by administrator.
A kind of data retrieval method provided in an embodiment of the present invention, network server carry out term according to preset rules
It is processed into satisfactory inquiry field, and the corresponding inquiry request of the inquiry field is sent to agent node；The generation
It manages node and query node for handling the inquiry request is determined according to the inquiry request and by the mark of the query node
Knowledge is sent to the network server；The inquiry request is sent to the query node by the network server；It is described to look into
It askes and query result is sent to the network server after node is inquired according to the inquiry request.By aforementioned schemes,
The workload of network server can be reduced, the requirement to server is reduced.
The embodiment of the present invention provides a kind of data retrieval system 00, as shown in Fig. 2, the data retrieval system 00 includes：
Network server 10 is processed into satisfactory inquiry field for carrying out term according to preset rules, and
The corresponding inquiry request of the inquiry field is sent to agent node 20；
The agent node 20, for determining the query node for handling the inquiry request according to the inquiry request
And the mark of the query node 30 is sent to the network server 10；
The network server 10 is additionally operable to the inquiry request being sent to the query node 30；
The query node 30, for query result to be sent to the network after being inquired according to the inquiry request
Server 10.
Optionally, the query node 30 is additionally operable to：Agent node 20 is searched after succeeding in registration and is saved by the agency
The network server is added in point 20.
Optionally, the query node 30 is specifically used for：
Configuration file is read, the address of the publication of the agent node 20 is searched, generates the reference to the agent node 20
Agency；
Determined whether to have been added to the network server 10 according to the feedback information of agent node 20.
Optionally,
The query node 30 is additionally operable to：According to predetermined period periodically heartbeat message is sent to the agent node 20；
The agent node 20 is additionally operable to：The state of the query node 30 is updated according to the heartbeat message.
Optionally,
The query node 30 is specifically used for：It is sent to after current state information is encapsulated into the heartbeat message described
Agent node 20；
The agent node 20 is specifically used for：It is looked into according to described in the state information updating for including in the heartbeat message
Ask the state of node 30；If more than the heartbeat message that N number of heart beat cycle does not receive the query node 30, the inquiry is deleted
The log-on message of node 30, the N are positive integer.
It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment weight
Point explanation is all difference from other examples, and the same or similar parts between the embodiments can be referred to each other.
For method class embodiment, since it is substantially similar to device embodiment, so fairly simple, the phase of description
Place is closed referring to the part of device embodiment to illustrate.
Data retrieval system provided in an embodiment of the present invention, network server, for according to preset rules by term into
Row is processed into satisfactory inquiry field, and the corresponding inquiry request of the inquiry field is sent to agent node；It is described
Agent node, for determining the query node for handling the inquiry request according to the inquiry request and saving the inquiry
The mark of point is sent to the network server；The network server is additionally operable to the inquiry request being sent to described look into
Ask node；The query node takes for query result to be sent to the network after being inquired according to the inquiry request
Business device.By aforementioned schemes, the workload of network server can be reduced, reduces the requirement to server.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer readable storage medium, such as read-only memory, disk or CD
Deng.Optionally, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly
Ground, the form that hardware may be used in each module/unit in above-described embodiment are realized, the shape of software function module can also be used
Formula is realized.The present invention is not limited to the combinations of the hardware and software of any particular form.
Although disclosed herein embodiment it is as above, the content only for ease of understanding the present invention and use
Embodiment is not limited to the present invention.Technical staff in any fields of the present invention is taken off not departing from the present invention
Under the premise of the spirit and scope of dew, any modification and variation, but the present invention can be carried out in the form and details of implementation
Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of data retrieval method, which is characterized in that including：
Term be processed into satisfactory inquiry field by network server according to preset rules, and by the inquiry word
The corresponding inquiry request of section is sent to agent node；
The agent node determines the query node for handling the inquiry request according to the inquiry request and is looked into described
The mark for asking node is sent to the network server；
The inquiry request is sent to the query node by the network server；
Query result is sent to the network server by the query node after being inquired according to the inquiry request.
2. according to the method described in claim 1, it is characterized in that, further including before the method：
The query node searches the agent node and the network service is added by the agent node after succeeding in registration
Device.
3. according to the method described in claim 2, it is characterized in that, the query node searches agent node simultaneously after succeeding in registration
The network server is added by the agent node, including：
The query node reads configuration file, searches the address of the agent node publication, generates to the agent node
Reference agency；
The query node determines whether to have been added to the network server according to the feedback information of the agent node.
4. according to the method described in claim 1, it is characterized in that, the method further includes：
The query node periodically sends heartbeat message according to predetermined period to the agent node；
The agent node updates the state of the query node according to the heartbeat message.
5. according to the method described in claim 4, it is characterized in that,
The query node periodically sends heartbeat message according to predetermined period to the agent node, including：
The query node is sent to the agent node after current state information is encapsulated into the heartbeat message；
The agent node updates the state of the query node according to the heartbeat message, including：
The agent node is according to the state of query node described in the state information updating for including in the heartbeat message；If
More than the heartbeat message that N number of predetermined period does not receive the query node, then the agent node deletes the query node
Log-on message, the N are positive integer.
6. a kind of data retrieval system, which is characterized in that including：
Network server is processed into satisfactory inquiry field for carrying out term according to preset rules, and will be described
The corresponding inquiry request of inquiry field is sent to agent node；
The agent node, for determining query node for handling the inquiry request according to the inquiry request and by institute
The mark for stating query node is sent to the network server；
The network server is additionally operable to the inquiry request being sent to the query node；
The query node, for query result to be sent to the network service after being inquired according to the inquiry request
Device.
7. system according to claim 6, which is characterized in that the query node is additionally operable to：Generation is searched after succeeding in registration
It manages node and the network server is added by the agent node.
8. system according to claim 7, which is characterized in that the query node is specifically used for：
Configuration file is read, the address of the agent node publication is searched, the reference to the agent node is generated and acts on behalf of；
Determined whether to have been added to the network server according to the feedback information of the agent node.
9. system according to claim 6, which is characterized in that
The query node is additionally operable to：According to predetermined period periodically heartbeat message is sent to the agent node；
The agent node is additionally operable to：The state of the query node is updated according to the heartbeat message.
10. system according to claim 9, which is characterized in that
The query node is specifically used for：Agency's section is sent to after current state information is encapsulated into the heartbeat message
Point；
The agent node is specifically used for：According to query node described in the state information updating for including in the heartbeat message
State；If more than the heartbeat message that N number of predetermined period does not receive the query node, the registration of the query node is deleted
Information, the N are positive integer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102693324B (en) * | 2012-01-09 | 2015-03-18 | 西安电子科技大学 | Distributed database synchronization system, synchronization method and node management method |
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