[HADOOP-3630] CompositeRecordReader: key and values can be in uninitialized state if files being joined have no records

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.17.0
• Fix Version/s: 0.18.0
• Hadoop Flags: Reviewed
• Assignee: Christopher Douglas
• Reporter: Jingkei Ly
• Created: 24/Jun/08 17:01
• Updated: 08/Jul/09 16:52
• Resolved: 09/Jul/08 00:56

Description

I am using org.apache.hadoop.mapred.join.CompositeInputFormat to do an outer-join across a number of SequenceFiles. This works fine in most circumstances, but I get NullPointerExceptions/uninitialized data (where Writable#readFields() has not been called) when some of the files being joined have no records in them.