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https://issues.apache.org/jira/browse/HADOOP-3630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608106#action_12608106
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Chris Douglas commented on HADOOP-3630:
---------------------------------------
The warning is from InputFormat::validateInput, which has been deprecated.
> CompositeRecordReader: key and values can be in uninitialized state if files
> being joined have no records
> ---------------------------------------------------------------------------------------------------------
>
> 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
> Fix For: 0.19.0
>
> Attachments: 3630-0.patch
>
>
> 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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