CompositeRecordReader: key and values can be in uninitialized state if files
being joined have no records
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Key: HADOOP-3630
URL: https://issues.apache.org/jira/browse/HADOOP-3630
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Affects Versions: 0.17.0
Reporter: Jingkei Ly
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.
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