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Type:
Task
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Resolution: Done
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Priority:
Minor - P4
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Affects Version/s: None
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Component/s: manual
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Labels:
The documentation for db.collection.mapReduce (http://docs.mongodb.org/manual/reference/method/db.collection.mapReduce/#db-collection-mapreduce) does not explain the return value from the function, which is a JSON document with the following fields (the descriptions are not exhaustive and need to be cross-checked with the code):
{
"result" : "<where the result is written>",
"timeMillis" : <how long it took>,
"counts" : {
"input" : <how many times was map called>,
"emit" : <how many times was emit called>,
"reduce" : <how many times was reduce called>,
"output" : <how many values were produced>
},
"ok" : <success or not>
}