Tutorial on Fault Tolerant CORBA

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Replication Styles• Passive Replication– Only one replica processes each requestOther replicas are available as backups if required– Lower memory and processing costs slowerrecovery from faults• Active Replication– Several replicas process each request– Fastest recovery from faults• Underlying mechanisms are the same for both<strong>Tutorial</strong> on Fault Tolerant CORBA © Eternal Systems, Inc, 2000
Who Has Control?• Infrastructure-controlled fault tolerance– Automatic creation and allocation of replicas– Automatic maintenance of replica consistency– More sensible for complex programs on servers• Application-controlled fault tolerance– Precise control over object creation and allocation– Application algorithms maintain replica consistency– May be necessary for embedded systems<strong>Tutorial</strong> on Fault Tolerant CORBA © Eternal Systems, Inc, 2000
Page 2 and 3: Tutorial onFault T
Page 4 and 5: Outline1. Introduction to Fault Tol
Page 6 and 7: Objectives of FT CORBA• Wide rang
Page 8 and 9: Types of Faults• Processor faults
Page 10 and 11: Object Groups• Replicas of an obj
Page 14 and 15: Fault Tolerance for the Client• F
Page 16 and 17: Fault Tolerance Domains• Aid appl
Page 18 and 19: Outlineâ2. Fault Tolerance Mechani
Page 20 and 21: Interoperable Object Group Referenc
Page 22 and 23: Access via IIOPDirectly to PrimaryI
Page 24 and 25: Access via IIOP and a GatewayIntero
Page 26 and 27: Most Recent Object Group Reference
Page 28 and 29: Outlineâ2. Fault Tolerance Mechani
Page 30 and 31: Transparent Reinvocation• Problem
Page 32 and 33: Transport HeartbeatsClient Side•
Page 34 and 35: Replication Style• Stateless- Rea
Page 36 and 37: Passive ReplicationClientinvokes a
Page 38 and 39: Infrastructure-ControlledMembership
Page 40 and 41: Application-ControlledMembership St
Page 42 and 43: Strong Replica Consistency• Maint
Page 44 and 45: Factories• Sequence of FactoryInf
Page 46 and 47: Replication Management• Replicati
Page 48 and 49: Property Manager• Fault tolerance
Page 50 and 51: Property Manager Interfacevoid set_
Page 52 and 53: Generic Factory Interface• Inheri
Page 54 and 55: create_object()Generic FactoryRepli
Page 56 and 57: Object Group Manager InterfaceObjec
Page 58 and 59: Outline4. Fault Tolerance Managemen
Page 60 and 61: Fault Detection & NotificationRepli
Page 62 and 63:
Fault Event Suppliers & Consumers
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Fault Notifier Interfacevoid push_s
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Outline4. Fault Tolerance Managemen
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Logging & RecoveryManagementLogging
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• get_state()• set_state()Check
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Logging & RecoveryManagementRecover
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Pool of Processors• Multiple repl
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Internet Server• Use pool of proc
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Internet Server• Must also provid
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Simple Switching Application• Lin
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Larger Switching ApplicationSwitchc
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Outline6. Fault-Tolerant Hello Serv
Page 86 and 87:
Hello Server Launcher1. Initialize
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Hello Server Launcher Main// Set ty
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Hello Server LauncherHelloServerLau
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Hello Server LauncherHelloServerLau
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Hello Server Factory1. Invoked by F
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Hello Server Factory Implementation
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Hello Server FactoryHelloServerLaun
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Hello Server Factory Main1. Initial
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Hello Server Factory Mainif (!CORBA
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Hello Server ImplementationThe impl
Page 106 and 107:
Hello Client Main1. Initialize the
Page 108 and 109:
Hello Client Main// Obtain the Hell
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Tutorial on Fault Tolerant CORBA

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