Coordinated Atomic Actions and System Fault Tolerance

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3. CA Actions: Concurrent ExceptionsIn a distributed system different activities may raise different exceptions and theexceptions may be raised simultaneously.Concurrent exceptions must be handled in a coordinated manner.Example: If there are two exceptions fire_alarm and gaze_leakage raisedconcurrently in two distributed cooperating activities, their separate handling, orhandling them in any order, or ignoring either of them can cause serious harm.There is a variety of reasons why several exceptions may be raised concurrently. Forexample, it is often difficult to interrupt the normal operations of the other nodesimmediately after an exception has been raised or the several exceptions can besymptoms of the same problems.12 February, 2004
3. CA Actions: Concurrent Exception ResolutionAn exception resolution graph approach is developed in order to find the exceptionthat “covers” all the exceptions raised concurrently. The graph imposes partialorder on all internal action exceptions.Universal Exception e4universal exceptionlevel 3Emergency Engine Loss Exception e3e 1 ∧ e 2 ∧ e 3level 2Left EngineException e1Right EngineException e2e 1 ∧ e 2 e 1 ∧ e 3e 2 ∧ e 3level 0level 1e 1 ee 2 e 3113 February, 2004
Page 10 and 11: 3. CA ActionsA CA action is a gener
Page 14 and 15: 3. CA Actions: Long-Lived Activitie
Page 16 and 17: 3. CA Actions: A Case Studyenvironm
Page 18 and 19: 3. CA Actions: A Case StudyPre-cond
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Page 22 and 23: 4. Integration of Complex Web Appli
Page 28 and 29: 5. CA Action Design of Web Applicat
Page 38 and 39: 6. Future Work and ConclusionsFault
Page 40: Thanks to Brian Randell, Avelino Zo

Coordinated Atomic Actions and System Fault Tolerance

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