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von robhe
13. Jul 2017 18:08
Forum: Archiv
Thema: MapReduce Basic Programming Model
Antworten: 3
Zugriffe: 432

Re: MapReduce Basic Programming Model

I think v2 indicates only the domain/type of the values which remain unchanged after reduce.
von robhe
12. Jul 2017 12:17
Forum: Archiv
Thema: MR - Reduce starting time
Antworten: 6
Zugriffe: 434

Re: MR - Reduce starting time

You are right, this paper section should be the answer.
Thanks a lot for the help!
von robhe
12. Jul 2017 11:32
Forum: Archiv
Thema: MR - Reduce starting time
Antworten: 6
Zugriffe: 434

Re: MR - Reduce starting time

Yes, I agree that this should be the reason why even completed mappers must be re-executed when a worker on that node fails. However, "Any reduce task that has not already read the data from worker A will read the data from worker B" means that there could be reduce tasks that have already read the ...
von robhe
12. Jul 2017 10:47
Forum: Archiv
Thema: MR - Reduce starting time
Antworten: 6
Zugriffe: 434

Re: MR - Reduce starting time

Thank you for the answer but I think this is contrarily to some statements in the MapReduce paper: "When a map task is executed first by worker A and then later executed by worker B (because A failed), all workers executing reduce tasks are notified of the reexecution. Any reduce task that has not a...
von robhe
11. Jul 2017 17:07
Forum: Archiv
Thema: MR - Reduce starting time
Antworten: 6
Zugriffe: 434

MR - Reduce starting time

Hello, I'm a little bit confused when the reduce task is starting relatively to the map task. Is it correct that the reduce calculation starts only if every map task has finished, but the reduce workers are already reading the results of the map tasks while the map tasks are still in process? Thank ...

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