Middleware for Grid Computing and the relationship to Middleware at large

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Middleware for Grid Computing and
therelationship to Middleware at large

• ECE 1770 Middleware Systems
• By Sepehr (Sep) Seyedi
• Date Thurs. January 23, 2003

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(No Transcript)
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What is Grid Computing?

• Definition of the Grid
• Controlled sharing of geographically distributed
  resources
• Virtual Organization
• Analogy with power grids
• Consistent, pervasive, dependable, and
  transparent access to electricity from different
  sources
• Characteristics of a Grid
• No centralized control center
• Heterogeneity (of resources)
• Scalability
• Dynamic and Adaptable

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Applications

• Presented early to see relevance to the design
  methodologies in grid middleware
• Classifications of Applications/Uses
• Computational Service
• Inherent part of ALL applications
• Data Service
• Scalable storage and access to distributed
  datasets
• Application Service
• Example like web services
• Information Service
• Example WWW portal
• Knowledge Service
• Example data mining

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A Layered View of a Grid
Grid Application

• Available as APIs global resource management
  resource brokers,

• Available as APIs global resource management
  resource brokers,

User-level Middleware
User-level Middleware
Core Middleware
Core Middleware
Grid Fabric

• Process management, co-allocation of resources,
  storage access, security, information registry
  and discovery, .

• Process management, co-allocation of resources,
  storage access, security, information registry
  and discovery, .

• Computers, supercomputers, storage devices,
  instruments

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Middleware Overview

• Many organizations involved
• ex Global Grid Forum and Globus

• Components
• Security
• Secure communications (SSL)
• Distributed security infrastructure
• Manage user credentials to selectingappropriate
  resources
• Data Management
• Transferring data throughout the grid and to
  users
• Globus GridFTP
• Deals with high-performance, security and
  reliability
• Information Management
• Information DB about resources
• Availability, capabilities,
• Resource Management

User-level Core ASPECTS
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Resource Management
? Types of resources needed ?

Application

Resource Broker
job
Resource Broker
? Specifications of requests
Resource Information Manager
Query
Multi-request
Resource Co-allocator
request
request
request
Local Resource Manager
Local Resource Manager
Local Resource Manager
Service/Resource
Service/Resource
Service/Resource
Service/Resource
Service/Resource
Service/Resource
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Open Grid Services Architecture (OGSA)

• Global Grid Forum (www.gridforum.org) driving
  force behind OGSA
• Promoting a standard and open architecture for
  interfaces to resources
• Assuring proper uniform behavior of all resources
  and interoperability in a heterogeneous
  environment

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The Grid Service

• Implemented as special a Web service
• Standardized behavior ? Standardized interfaces
• Standard interfaces in terms of Web Services
  Description Language (WSDL) ? GSDL
• Implementation independent
• The grid service is able to live on any host
  environment that supports web services.
• Examples J2EE, .NET, C, Python, which cover
  most existing operating systems

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The Grid Service Interface

• Grid Services must support
• Discovery
• Registry holds information about service
  instances
• Dynamic Service (instance) creation
• Factory creates service instances
• Lifetime management
• Life length, termination of service in case of
  failure of resource
• Notification
• Manageability
• Monitoring and managing service instances
• Grid Services can also provide (custom)
  application services, like web services

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How does a Grid Service work?

• Client uses a Grid service interface
• A grid service instance is created from a Factory
  with the help of a Registry
• The grid service instances run with appropriate
  resources automatically allocated
• New instances can allocated and destroyed
  dynamically, to benefit performance
• Example A web serving environment could
  dynamically allocate extra instances to provide
  consistent user response time

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Simple Invocation Example
User Invocation


Factory
Service Instance
Service Instance
Service Instance
Real Services -EJB -Java Class
Service Instance
Service Instance
Service Instance

Service Instance
Service Instance
Service Instance
Registry
Compute service provider
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Hierarchical Use of Grid Services
Collective Services Environment
Simple Hosting Environment
Virtual Hosting Environment
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Relationship with Middleware at large

• Distributed Computing
• Grid computing itself can be thought of as a
  distributed system
• Differs by providing a controlled, dynamic
  resource-sharing framework that addresses the
  requirements of a grid
• Comparison to CORBA, J2EE, and .NET
• Grid computing can be used as a building block in
  other middleware systems
• Too much middleware
• Benefiting other middleware technologies
• Web services is making advances due to grid
  services

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Conclusions

• Characteristics of a grid relevant to middleware
• Common design methodologies in grid middleware
• Grid Services and open standardization
• New and existing middleware systems are beginning
  to adopt core grid middleware to become easily
  grid-enhanced

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Thank You!Any Questions ??
CHECKOUT www.gridcomputing.com for more
information on Grid Computing!