KR100616083B1 - Site-based Flat Grid Information Service Mechanism using the OGSI Framework, and System thereof - Google Patents

Abstract

The present invention relates to a method for providing a site-based horizontal structure grid information service using an OGSI framework. The present invention provides a method for providing a grid-based information by mitigating difficulty of a distributed system and maintaining a unit information service horizontally through a site-based information service. It is possible to keep the information in sync with each other and to share information according to the site policy, thereby allowing flexible and dynamic participation in VO (Virtual Organization). In addition, it provides a mechanism to distribute the VO query load to guarantee the scalability of the grid, and solves the problem of information retrieval delay caused by adopting a horizontal structure by using a thread-based query technique.

The method for providing a site-based horizontal structure grid information service using the OGSI framework according to the present invention categorizes and groups information about resources in a domain managed by the present invention, and manages creation, deletion, and access control for this group. Site Information Service (SIS); A VO Subscription Service (VSS) that manages the joining and leaving of a Virtual Organization (VO) that it manages; And a VO query service (VQS) that performs an agent function for performing a VO query on behalf of a user, wherein the VO subscription service and the VO query service are operated by a VO administrator to configure a VO. To participate, the Site Information Services (SIS) administrator creates a VO Member Group (VMG) that manages and maintains information about the resources to be released to the VO, and registers the resources according to site policy. And VO query of the user through the VO member group (VMG).

Description

Site-based Flat Grid Information Service Mechanism using the OGSI Framework, and System

1 is a diagram illustrating a service architecture for providing a site-based horizontal structure grid information service using the OGSI framework according to the present invention.

2 is a view showing a process of building a site information service that is the basis of the present invention

3 is a diagram illustrating a process of constructing a VO by registering resources published in each site with the VO.

4 is a view illustrating a process of processing two query methods, namely, site query and VO query, provided to a user in the present invention

<Description of Symbols for Main Parts of Drawings>

10: user 20_A: site A

20_B: site B 20_C: site C

20_D: Site D 30: Site Information Service

40: Local Information Group

50: Grid Service

60: VO Member Group

70: VO Query Service

80: VO Subscription Service

90: query instance

100_A: VO-A 100_B: VO-B

The present invention relates to a grid information service providing method, in particular, site-based horizontal using an OGSI (Open Grid Service Infrastructure) framework that provides an effective information system for the grid (Grid), a kind of large-scale distributed system It relates to a method for providing a structural grid information service.

In general, a grid is a software infrastructure that integrates computing resources, data, research equipment, etc. managed by a plurality of geographically dispersed organizations through a high-speed network. Grid applications often require large amounts of computational resources and data that are not currently supported by the Internet and Web Infrastructure. Grid information systems that provide the discovery, identification, and monitoring of resources and services in these environments are the foundation for securing the optimal resources required for grid applications.

Resource information provided by the grid information system generally means hardware information and software information. The hardware information includes not only a specification of the elements that make up the system, such as a CPU, memory, disk, and network, but also status information such as the current utilization of those elements. The software information includes software information installed in the operating system and the system, the running state of the software, information about the assigned job, and the like. In addition, the grid information system is built as a virtual organization (hereinafter referred to as VO) that allows heterogeneous and distributed resources to be dynamically shared with each other, and is used to share and integrate various resources within the VO. It plays an important role.

Grid information systems, such as the Monitoring and Discovery System (MDS), which are currently being used the most, are being developed by the Globus project and provide information on distributed resources. It collects through a service called Provider Service, collects and maintains it on a specific server called Index Service, and manages it. The information collected in the server may be operated in a hierarchical structure in which its information is distributed to a server of a higher layer and distributed.

Condor Matchmaker is developed by the Condor Project and is divided into matchmakers for resource discovery and monitoring. In the case of resource discovery, resources and tasks are represented as Classified Ads (ClassAds), and when the two match, the task is performed on that resource. In the case of resource monitoring, the resource state and trigger are expressed as ClassAds, and when the two match, the defined action is performed.

The Relational Grid Monitoring Architecture (R-GMA) is being developed by the Enabling Grids for E-science in Europe (EGEE) project, representing information as if the information is distributed among resources within a virtual relational database. do. R-GMA provides Web services for information, monitoring, and logging in distributed computing environments.

Network Weather Service (NWS) is a distributed system that periodically monitors networks and computing resources and dynamically predicts their performance. The system collects information through distributed performance sensors and predicts the performance by using various calculation models. Sensors are currently used to measure end-to-end TCP / IP performance (bandwidth / latency), available CPU rate, and available memory.

Problems of the conventional grid information system as described above are as follows.

First, it is difficult to reflect the flexible and dynamic nature of the grid. The various VOs in the grid are frequent and free to join and leave participants. Therefore, it is important that information systems respond appropriately to these dynamic changes to ensure that information is maintained correctly.

Second, resource sharing based on policy is difficult. Participants in the VO want to control these disclosures appropriately in releasing their resources. The absence of this mechanism makes the grid reluctant to participate. Therefore, a mechanism for proper resource sharing is required according to the policy set by the resource owner.

Third, it is difficult to guarantee scalability of information systems. In general, a plurality of VOs may exist in one grid, and various computing resources and users using the same may exist in one VO. Therefore, to provide a smooth grid information service, a distributed system is required. In addition, various mechanisms are required to guarantee the QoS of query response time for enormous grid state information.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to alleviate the difficulty of the distributed system through the site-based information service and to maintain the site-based information service horizontally, To provide a method for providing a site-based horizontal structure grid information service using an OGSI framework that can maintain synchronization.

In addition, another object of the present invention is a site-based horizontal structure grid using the OGSI framework that enables the sharing of information according to the site policy to enable flexible and dynamic virtual organization (hereinafter referred to as "VO") participation An information service providing method is provided.

In addition, another object of the present invention is to provide a mechanism for distributing the VO query load in order to ensure the scalability of the grid, and the problem of delay in information retrieval speed that can occur by adopting a horizontal structure by using a thread-based query technique. To provide a site-based horizontal structure grid information service providing method using OGSI framework to solve the problem.

Method for providing a site-based horizontal structure grid information service using the OGSI framework according to the present invention for achieving the above object,

A site information service (SIS) for classifying and grouping information on resources in a domain managed by the user, and managing creation, deletion, and access control of the group;

A VO Subscription Service (VSS) that manages the joining and leaving of a Virtual Organization (VO) that it manages; And

VO Query Service (VQS), which acts as an agent to perform VO queries on your behalf;

The VO subscription service and the VO query service are operated by a VO administrator to configure a VO, and a site information service (SIS) administrator manages and maintains information on resources to be disclosed to the VO to participate in the VO. A VO is created by creating a VO member group (VMG) and registering resources according to site policy, and processing a VO query of a user through the VO member group (VMG).

Here, the group in the site information service (SIS) is a local information group (LIG) that provides information about resources in a domain and a VO member group (VMG) that manages and maintains information to be disclosed to any VO of domain information. And is generated and managed through an open grid service infrastructure (OGSI) factory mechanism of the site information service (SIS).

In addition, the method of configuring a site-based information service by the site information service (SIS) administrator may include creating a local information group (LIG) for managing and maintaining all resource information in a domain; The location information GSH of the generated local information group LIG is announced to each resource manager in the domain, and each resource manager registers a grid service managing the situation information of the resource in the local information group LIG. Doing; And performing a site information service through the local information group LIG.

In addition, the SIS administrator creates a VO Member Group (VMG) that manages and maintains resource information to be published to a VO in order to participate in a VO, and reminds administrators of appropriate resources according to site policy. Publishing location information GSH of the VO member group VMG; Registering, by each resource manager, a grid service managing resource status information with the VO member group (VMG); And providing access and services to the VO member group (VMG) only to users in the VO.

In addition, only one local information group LIG exists in the site information service SIS, and a plurality of VO member groups VMG exist in the site information service SIS according to the number of VOs to be subscribed to. It is done.

In addition, the method for building the VO includes the step of requesting the VO subscription service (VSS) administrator to subscribe to the site information service (SIS) administrator; And after confirming that the VO subscription manager (VSS) manager complies with the VO policy, register the location information (GSH) of the VO member group (VMG) provided by the site information service (SIS) administrator and register the VO subscription service (VSS). Signing up through the operation; characterized in that it comprises a.

In addition, the time that each VO member group (VMG) to maintain the subscription when the VO subscription is controlled by the VO subscription service (VSS) administrator, characterized in that withdrawal from the VO.

Accordingly, the present invention compensates for the shortcomings of the existing grid information system, expands the functions, and has the following features. Site-based information services are used to alleviate the management difficulties of distributed systems and to maintain synchronization of the entire grid state information by keeping site-based information services horizontal. In addition, it enables flexible and dynamic VO participation by sharing information according to site policy. Finally, we provide a mechanism to distribute the VO query load to guarantee the scalability of the grid, and use a thread-based query technique to solve the problem of information retrieval delay caused by adopting a horizontal structure.

Through the present invention can solve the problems of the existing operation of the grid and it may be possible to effectively operate and service.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

First, the present invention was developed on a framework called Open Grid Service Infrastructure (hereinafter, referred to as 'OGSI'). OGSI is a framework that extends the Web Service framework to the grid to ensure interoperability of interconnected software components over the Internet. Web services on OGSI are called 'Grid Services'.

1 is a diagram illustrating a service architecture for providing a site-based horizontal structure grid information service using the OGSI framework according to the present invention.

As shown in FIG. 1, the present invention consists of three grid services. First, the Site Information Service (hereinafter referred to as SIS) 30 classifies and groups information about resources in a domain managed by the site information, and creates, deletes, and controls access to the group. Manage. The group is a Local Information Group (hereinafter referred to as "LIG") 40 which provides information about resources in the domain and a VO Member Group which manages and maintains information to be disclosed to any VO of the domain information. Member Group: (hereinafter referred to as VMG) 60, which is created and managed through the Open Grid Service Infrastructure (OGSI) factory mechanism of Site Information Service (SIS).

To configure a site-based information service, a site information service (SIS) administrator creates a local information group (LIG) 40 that manages and maintains the entire resource information in its domain and registers the resources in the domain. Site information service 30 is achieved through this local information group (LIG) 40. That is, the user's site query is processed through the local information group (LIG) 40.

The VO Subscription Service (hereinafter referred to as 'VSS') 80 and the VO Query Service (hereinafter referred to as 'VQS') 70 are operated by the VO administrator to compose the VO. . The VO subscription service (VSS) 80 manages subscription and withdrawal for VO managed by this service, and the VO query service (VQS) 70 performs an agent function to perform VO queries on behalf of a user. do.

To participate in a VO, a Site Information Services (SIS) administrator creates a VO Member Group (VMG) 60 that manages and maintains information about resources to be published to that VO and registers the resources according to site policy. The VO member group (VMG) 60 thus created is registered by the VO administrator according to the VO policy. Through this process, one VO is configured, and information service on the VO is performed through the VO Query Service (VQS) 80. That is, the user's VO query is processed through the VO query service (VQS) 80.

In FIG. 1, four sites (Site A to Site D) 20_A to 20_D participate to configure and service two VOs (VO-A) (VO-B). Each site operates its own local information group (LIG) 40 for site information services. Site A (20_A), Site B (20_B), and Site C (20_C) are VO-A (100_A). ), Site B (20_B), Site C (20_C), and Site D (20_D) operate a VO Member Group (VMG) 60 to participate in VO-B, respectively.

2 is a view showing a process of building a site information service that is the basis of the present invention.

Site Information Services (SIS) administrators first provide full information about resources in a domain through a local information group that provides full information about resources in a domain through Site Information Services (SIS) CreateService operations. Local information group (LIG) 40 is configured. The location information (Grid Service Handle: hereinafter referred to as 'GSH') of the generated local information group (LIG) 40 is announced to each resource manager in the domain, and each resource manager manages the status information of the resource. Register the grid service with the Local Information Group (LIG) 40 through the Registry PublishProvider mechanism.

The local information group (LIG) 40 is accessible and serviced only by users in that domain. To participate in a VO, a Site Information Services (SIS) administrator creates a VO Member Group (VMG) 60 that manages and maintains resource information to be published to that VO, and provides the administrators of the appropriate resources with site policies. Announce the GSH of the VO member group (VMG) 60. Each resource manager registers a grid service that manages resource status information with this VO member group (VMG) 60 through a 'RegistryPublishProvider' mechanism. The VO member group (VMG) 60 is accessible and serviced only by users in the VO. There is only one local information group (LIG) 40 in the Site Information Service (SIS) 30, and the VO Member Group (VMG) 60 is in the Site Information Service (SIS) 30 depending on the number of VOs to be subscribed to. There may be a plurality.

The process of building the VO can be seen through FIG. 3. Site Information Services (SIS) administrators request VO Subscription Service (VSS) administrators to subscribe, and VO Subscription Service (VSS) administrators verify compliance with VO policies, and then the VO member groups provided by Site Information Services (SIS) administrators ( The GSH of the VMG 60 is subscribed through a register operation of the VO subscription service (VSS) 80. The time at which each VO member group (VMG) 60 maintains a subscription during the VO subscription is controlled by the VO Subscription Service (VSS) administrator, and when the time expires, the VO member is withdrawn.

A user using the present invention can receive two query services, as shown in FIGS. 4A and 4B. One is an information query about the site to which it belongs, and the other is an information query about the VO to which it belongs. A user can be included in one site and multiple VOs. The query process for the site is performed through the 'findServiceData' operation on the local information group (LIG) 40 of the site to which the site belongs. The query process for VO is as follows. The user selects one of the VO query services (VQS) 70 of the VO to which the user belongs and performs the VO query. The VO Query Service (VQS) 70 that receives a user's query creates a Query Instance 90 (QI) for that user, and the Query Instance 90 queries the query. To identify an object, a list of VO member groups (VMGs) 60 of that VO is obtained through the 'findServiceData' operation of the VSS. Query instance (QI) 90 performs the 'findServiceData' operation on the user's query to the identified VO member groups (VMGs), collects the results and returns them to the user. In order to optimize query performance, queries for each VO member group (VMG) 60 of the query instance (QI) 90 are concurrently thread based. The query instance (QI) 90 is destroyed after the execution result for the user query is returned.

As such, the present invention proposed a site-based horizontal grid information service architecture to improve the efficiency and solve problems of the existing grid information service. The architecture is based on OGSI, which defines interoperable grid services. Based on this, many agent-based VO query mechanisms considering query load balancing, concurrent query mechanisms using experience-based threads within one VO agent, and dynamic and efficient VO participation mechanisms of directory servers through OGSI factory approach Provided. Therefore, the present invention can increase the value of grid operation and use by providing more effective information services to grid administrators and users.

The present invention is not limited to the above-described embodiments, but can be variously modified and changed by those skilled in the art, which should be regarded as included in the spirit and scope of the present invention as defined in the appended claims. something to do.

As described above, the method for providing a site-based horizontal structure grid information service using the OGSI framework according to the present invention may exhibit the following improved effects.

1. Fast synchronization of dynamic grid status information

In the present invention, each directory server is maintained in a horizontal structure. In the horizontal structure, it is easier to reflect the variable and dynamic characteristics of the grid than the hierarchical structure. In other words, it is possible to quickly synchronize the entire grid information when joining / unsubscribing a directory server, and smooth information service is possible even when one directory server fails.

2. Effective management of grid information system

The efficiency and availability of distributed systems such as grids depend on the effective management of information systems. In other words, if the information system does not operate smoothly, the distributed system cannot perform normal operations. Therefore, it can be said that efficient management of each directory server constituting the information system is essential. On the other hand, the most difficult thing in distributed system management is managing components outside its own domain. In order to solve this problem, the present invention guarantees effective management of the entire grid information system by operating the directory server by limiting the management domain to the range of sites that can be managed by itself.

3. Flexible and dynamic VO participation based on site policy

The present invention provides a mechanism for managing resources to be registered in each VO according to site policy through the OGSI factory access method. This mechanism works by keeping information to be registered in each VO as a VMG. This allows VO participants to flexibly manage their resources in accordance with their policies, thereby reducing the burden of resource disclosure, and reducing these burdens will allow more participants to become part of the VO, thus creating a more useful VO. You can do it.

4. Scalability-Based VO Query Load Balancing and Rapid Information Retrieval

In an information system, the response time of a query is an important factor in evaluating the performance of that system. Therefore, to guarantee fast query response time, a mechanism is needed to balance the load appropriately when a query load occurs. In the present invention, the QoS of the query response time can be guaranteed even if the number of users in the VO increases by using the site-based query agent deployment approach. In addition, to reduce the query response time delay caused by adopting the horizontal structure, the query response time is reduced by using a thread-based query method.

Claims (7)

A site information service (SIS) for classifying and grouping information on resources in a domain managed by the user, and managing creation, deletion, and access control of the group; A VO Subscription Service (VSS) that manages the joining and leaving of a Virtual Organization (VO) that it manages; And VO Query Service (VQS), which acts as an agent to perform VO queries on your behalf; The VO subscription service and the VO query service are operated by a VO administrator to configure a VO, and a site information service (SIS) administrator manages and maintains information on resources to be disclosed to the VO to participate in the VO. OGSI framework, characterized in that a VO is created by creating a VO member group (VMG) and registering resources according to site policy, and processing a user's VO query through the VO member group (VMG). Site-based horizontal structure grid information service providing method using a. The method of claim 1, Groups in the site information service (SIS) are classified into a local information group (LIG) that provides information about resources in a domain and a VO member group (VMG) that manages and maintains information to be disclosed to any VO among domain information. And, generated and managed through an open grid service infrastructure (OGSI) factory mechanism of the site information service (SIS). The method of claim 1, The site information service (SIS) administrator configures a site-based information service, Creating a local information group (LIG) that manages and maintains all resource information in the domain; The location information GSH of the generated local information group LIG is announced to each resource manager in the domain, and each resource manager registers a grid service managing the situation information of the resource in the local information group LIG. Doing; And Site information service through the local information group (LIG); and a method for providing a site-based horizontal structure grid information service using an OGSI framework. The method of claim 3, wherein The SIS member creates a VO Member Group (VMG) that manages and maintains resource information to be published to the VO in order to participate in the VO, and sends the VO member to administrators of appropriate resources in accordance with site policy. Publishing the location information GSH of the group VMG; Registering, by each resource manager, a grid service managing resource status information with the VO member group (VMG); And And providing access and services to the VO member group (VMG) only to users in the VO. The method of claim 1, further comprising providing a site-based horizontal grid information service using an OGSI framework. The method of claim 4, wherein Only one local information group (LIG) exists in the site information service (SIS), and a plurality of the VO member groups (VMG) exist in the site information service (SIS) according to the number of VOs to be subscribed to. A method for providing site-based horizontal grid information service using OGSI framework. The method of claim 1, wherein the method of constructing the VO comprises: Requesting, by the SIS administrator, the VO subscription service (VSS) administrator to subscribe; And After confirming that the VO subscription service manager (VSS) conforms to the VO policy, register operation of the VO subscription service (VSS) location information (GSH) of the VO member group (VMG) provided by the site information service (SIS) administrator. Signing through the; site-based horizontal structure grid information service providing method using the OGSI framework, comprising a. The method of claim 6, The time at which each VO member group (VMG) maintains a subscription when the VO is subscribed is controlled by the VO subscription manager (VSS) and when the time expires, the site is based on the OGSI framework. How to provide horizontal structural grid information service.

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