Red Hat Bugzilla – Bug 1001413
Last modified: 2014-01-15 19:02:13 EST
Title: About MapReduce
Describe the issue:
Section 3.2. appears to be incorrect - see starred text:
3.b. If a Combiner has been specified with **task.combinedWith(Reducer)**, the Combiner is called on the Mapper results and the combiner's results are retured to the master node or inserted in the intermediary cache.
Suggestions for improvement:
Adding NeedInfo for Dan.
I agree that the section is a bit confusing, Combiner is capitalized so users might expect it to be an actual interface. But the combiner uses the Reducer interface, so task.combinedWith() has a Reducer parameter. Perhaps we should change **task.combinedWith(Reducer)** to **task.combinedWith(combiner)**, without a capital C?
The fix for this bug is now generally released and available here: