SequenceFile.Reader constructor leaking resources
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Key: MAPREDUCE-1504
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1504
Project: Hadoop Map/Reduce
Issue Type: New Feature
Reporter: Zheng Shao
When {{SequenceFile.Reader}} constructor throws an {{IOException}} (because the
file does not conform to {{SequenceFile}} format), we will have such a problem.
The caller won't have a pointer to the reader because of the {{IOException}}
thrown.
We should call {{in.close()}} inside the constructor to make sure that we don't
leak resources (file descriptor and connection to the data node, etc).
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