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courses:mapreduce-tutorial:step-7 [2012/01/29 20:51] straka |
courses:mapreduce-tutorial:step-7 [2012/01/29 20:52] straka |
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| less less step-7-out-sol/ | less less step-7-out-sol/ | ||
| Remarks: | Remarks: | ||
| - | * The reducers seem to start running before the mappers | + | * The reducers seem to start running before the mappers |
| + | * during the first 33%, the mapper outputs are copied | ||
| + | * during the second 33%, the (key, value) pairs are sorted | ||
| + | * during the last 33%, the user-defined reducer runs | ||
| ---- | ---- | ||