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https://issues.apache.org/jira/browse/HIVE-2711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13243918#comment-13243918
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Ashutosh Chauhan commented on HIVE-2711:
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I see. Yeah, very first commit of RCFile
http://svn.apache.org/viewvc/hadoop/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/io/RCFile.java?view=markup&pathrev=770548
started with SEQ6 so there could possibly be no data written in RCFile format
with version SEQ5 or earlier. So, backward compatibility with SEQ6 suffices.
So, +1 will commit if tests pass.
> Make the header of RCFile unique
> --------------------------------
>
> Key: HIVE-2711
> URL: https://issues.apache.org/jira/browse/HIVE-2711
> Project: Hive
> Issue Type: Bug
> Components: Serializers/Deserializers
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Attachments: HIVE-2711.D2115.1.patch
>
>
> 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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