Make the header of RCFile unique
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Key: HIVE-2711
URL: https://issues.apache.org/jira/browse/HIVE-2711
Project: Hive
Issue Type: Bug
Components: Serializers/Deserializers
Reporter: Owen O'Malley
The RCFile implementation was copied from Hadoop's SequenceFile and copied the
'magic' string in the header. This means that you can't use the header to
distinguish between RCFiles and SequenceFiles.
I'd propose that we create a new header for RCFiles (RCF?) to replace the
current SEQ. To maintain compatibility, we'll need to continue to accept the
current 'SEQ\06' and just make new files contain the new header.
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