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SWF (WorkFlow Execution (1.Implement Activity workers with the processing…
SWF
WorkFlow Execution
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5.execution is started,until decider makes a decision to close the execution
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Workflow History
the history provides a record of which activities were scheduled, their current status, and their results
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Decider
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Workers and Deciders are both stateless,負荷增加時，只要再增加 Worker and decider 數量即可
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Limit
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10,000 workflow/activity types
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Activities
registered with SWF as an activity type with information such as name, version and timeout
Activity Worker:
a program that receives activity tasks, performs them, and provides results back
Activity tasks:
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distributed across multiple computers,different regions
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WorkFlow
1.A workflow is a set of activities that carry out some objective
2.is the automation of a business process