Question: The PageRank computation for each Web URL can be done using either MapReduce or Spark. In the presence of failures, what mechanism / property is

The PageRank computation for each Web URL can be done using either MapReduce or Spark. In the presence of failures, what mechanism/property is used to ensure that MapReduce produces the same output as would have been produced by a non-faulting sequential execution of the entire program? How can MapReduce realize such a property?

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