Tutorial on Fault Tolerant CORBA

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Transparent Reinvocation• ProblemWith reinvocation for COMPLETED_MAYBE,at-most-once semantics might be violatedif no extra mechanisms are in place• SolutionREQUEST Service Context– Client Id– Retention Id– Expiration TimeAllows server ORB to recognize that a request isa repetition of a previous requestIf it is, server does not reexecute the request butreturns the reply that was previously generated<strong>Tutorial</strong> on Fault Tolerant CORBA © Eternal Systems, Inc, 2000
Transport Heartbeats• Problem– Host or connection fails during clientinvocation– TCP/IP connection not cleanly torn downand Client ORB hangs on the connection• Solution– Periodic heartbeat messages over theconnection<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 12 and 13: Replication Styles• Passive Repli
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 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
Page 64 and 65: Fault Notifier Interfacevoid push_s
Page 66 and 67: Outline4. Fault Tolerance Managemen
Page 68 and 69: Logging & RecoveryManagementLogging
Page 70 and 71: • get_state()• set_state()Check
Page 72 and 73: Logging & RecoveryManagementRecover
Page 74 and 75: Pool of Processors• Multiple repl
Page 76 and 77: Internet Server• Use pool of proc
Page 78 and 79: Internet Server• Must also provid
Page 80 and 81:
Simple Switching Application• Lin
Page 82 and 83:
Larger Switching ApplicationSwitchc
Page 84 and 85:
Outline6. Fault-Tolerant Hello Serv
Page 86 and 87:
Hello Server Launcher1. Initialize
Page 88 and 89:
Hello Server Launcher Main// Set ty
Page 90 and 91:
Hello Server LauncherHelloServerLau
Page 92 and 93:
Hello Server LauncherHelloServerLau
Page 94 and 95:
Hello Server Factory1. Invoked by F
Page 96 and 97:
Hello Server Factory Implementation
Page 98 and 99:
Hello Server FactoryHelloServerLaun
Page 100 and 101:
Hello Server Factory Main1. Initial
Page 102 and 103:
Hello Server Factory Mainif (!CORBA
Page 104 and 105:
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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