MongoDB: Implementing incremental map-reduce similar to CouchDB

Is there a way to replicate couchdb's incremental MapReduce functionality in MongoDB? Our goal is to perform periodic map reduce operations that only affect new documents in a collection.

Would it be possible to utilize the finalize function to label documents as 'old' and exclude them from the next map process?

Answer №1

Absolutely, MongoDB has supported incremental map reduce functionality since version 1.8. You can find detailed examples in the article I wrote here:

Answer №2

My solution to this problem involves a method that eliminates the need to adjust individual source records by leveraging the timestamp embedded in the default ObjectId ids. Check out my gist for more details:

https://gist.github.com/2233072

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