[HADOOP-3827] Jobs with empty map-outputs and intermediate compression fail

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.18.0
• Fix Version/s: 0.18.0
• Assignee: Arun Murthy
• Reporter: Arun Murthy
• Created: 25/Jul/08 00:40
• Updated: 08/Jul/09 16:52
• Resolved: 25/Jul/08 18:58

Description

The corner case where there are zero map-outputs doesn't pass the codec to the IFile.Writer leading to un-compressed data and subsequently failure on the reduce when it tries to decompress that data.

The straight-forward fix is to pass the codec:

           Writer<K, V> writer = new Writer<K, V>(job, finalOut, 
-                                                 keyClass, valClass, null);
+                                                 keyClass, valClass, codec);