Are you using a custom scheduler? I have seen issues with jobs having 0 mappers and 1 reducer with Fair scheduler.
From: hadoop n00b [mailto:new2h...@gmail.com] Sent: Thursday, August 11, 2011 9:32 AM To: user@hive.apache.org Subject: Reducer Issue in New Setup Hello, We have just setup Hive on a new Hadoop cluster. When I run a select * on a table, it works fine but when I run any query which needs a reducer, like count(1) or a where condition, the query just sits there doing nothing (map 0%). I see some message like no reducers to run. How do I fix this? The configuration et al is exactly like another environment that is working fine. We are running CDH2 with Hadoop 0.20.1 and Hive 0.4.1 Cheers!
