[jira] Commented: (HADOOP-3315) New binary file format

["Doug Cutting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12595716#action_12595716 ] 

Doug Cutting commented on HADOOP-3315:
--------------------------------------

 - Magic should be at start of file too.
 - Why use 8-bytes for index length, rowid & offset -- could be VInts of deltas no?
 - Shouldn't metadata be an extensible list of <String,String> pairs?  This could be encoded as <count>(<string><string>)^count, where <count> is a vint, and strings are vint-prefixed binary data.  Some metadata keys might be reserved, like "hasKeys", "hasValues", "keyClass", "valueClass", "entryCount", etc.
 - Need support for total entries.

> 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
>         Attachments: Tfile.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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