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並前往https://www.quora.com/Is-Map-Reduce-implemented-as-%E2%80%9CThreads%E2%80%9D-If-yes-then-which-classes-packages-implement-the-function

Is Map-Reduce implemented as “Threads”? If yes, then ...

Map function is incompatible with the input data you are processing. As you can see in Exception string java.io.IOException: Type mismatch in key from map: ...

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