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https://issues.apache.org/jira/browse/HADOOP-3315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12634760#action_12634760
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Amir Youssefi commented on HADOOP-3315:
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1) Currently there are two versions one for TFile API and other for BCFile API.
Version consists of a Major and a Minor.
TFile/BCFile API versions are stored when a new file is written. Later when we
read a file, API versions used for reading are compared to versions from file.
Currently we only check Major and throw an exception if there is a mismatch in
Major.
We can add more compatibility logic to this code when necessary.
2) There are some compatibility ideas incorporates in the design (see Page 11
of attached spec for more details).
> New binary file format
> ----------------------
>
> Key: HADOOP-3315
> URL: https://issues.apache.org/jira/browse/HADOOP-3315
> Project: Hadoop Core
> Issue Type: New Feature
> Components: io
> Reporter: Owen O'Malley
> Assignee: Amir Youssefi
> Attachments: HADOOP-3315_20080908_TFILE_PREVIEW_WITH_LZO_TESTS.patch,
> HADOOP-3315_20080915_TFILE.patch, TFile Specification Final.pdf
>
>
> SequenceFile's block compression format is too complex and requires 4 codecs
> to compress or decompress. It would be good to have a file format that only
> needs
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