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From "Ashutosh Chauhan (Commented) (JIRA)" <>
Subject [jira] [Commented] (HIVE-2711) Make the header of RCFile unique
Date Mon, 02 Apr 2012 00:22:28 GMT


Ashutosh Chauhan commented on HIVE-2711:

I see. Yeah, very first commit of RCFile
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
> Make the header of RCFile unique
> --------------------------------
>                 Key: HIVE-2711
>                 URL:
>             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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