MapReduce Cloud Computing Question:
Do you know the general mapreduce algorithm?
Answer:
The mapreduce algorithm has 4 main phases:
1. Map,
2. Combine,
3. Shuttle and sort
4. Phase output
Mappers simply execute on unsorted key/values pairs.They create the intermediate keys. Once these keys are ready the combiners pair the key/value pairs with the right key. The shuttle/sort is done by the framework their role being to group data and transfer it. Once completed, it will proceed for the output via the phase output process.
1. Map,
2. Combine,
3. Shuttle and sort
4. Phase output
Mappers simply execute on unsorted key/values pairs.They create the intermediate keys. Once these keys are ready the combiners pair the key/value pairs with the right key. The shuttle/sort is done by the framework their role being to group data and transfer it. Once completed, it will proceed for the output via the phase output process.
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