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Why can Google App Engine tasks fail erroneously multiple times?

Why can Google App Engine tasks run more than once? According to Brett Slatkin of Google I / O 2009 , it is possible that the task might get confused twice, even without server crashes!

Does this have anything to do with the false awakening of flows?

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Brant Slatkin gave a similar talk in I / 0 2010 .

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Source: https://habr.com/ru/post/1774217/

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