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Type: Bug
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Resolution: Done
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Priority: Major - P3
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None
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Affects Version/s: 2.0.4
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Component/s: MapReduce
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None
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Environment:centos 6
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ALL
If you run a map reduce and only emit a single document, the reduce doesn't get run. At first it seems like this would make sense since there's nothing to reduce, but the reduce often changes the document format (gets counts, etc...) and therefore the output you get will be wrong for those operations.
- is related to
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SERVER-10736 Modify MapReduce to "map, shuffle, reduce", and always take lists on the reducer input
- Closed