Hi, The MapReduce tutorial mentions Combiners only in passing. Is there a default Combiner or default combining behaviour?
Concretely, I want to make sure that records are not getting combined behind the scenes in some way without me seeing it, and causing me to lose data. For instance, if there is a default Combiner or default combining behaviour that collapses multiple records with identical keys and values into a single record, I'd like to avoid that. Instead of blindly collapsing identical records, I'd want to aggregate their values and emit the aggregate. Thanks, Otis -- Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch
