mongodb/mongo-hadoop — Issue #22: Mapper receives only part of the collection. 
Author: yankov
Created: 2011-11-22 23:10:59+00:00
State: open

As I understand a single mapper should receive a single split with the entire collection.
When using big collections (>400k records) for some reason mapper receives only about 390k records (I see the value in map input records when job is done). And therefore calculations seem to be wrong.

Should "Map input records" always show the real size of the passed collection?