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https://issues.apache.org/jira/browse/HADOOP-3315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12592871#action_12592871
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Andrzej Bialecki commented on HADOOP-3315:
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Writers know exactly how many records have been written, so they can write the
record count easily. I suggest using MapWritable for the metadata section, so
that we can store other data, not just Strings. Record counts are just an
example of informaiton that becomes available only when closing a file - other
info may include timestamps, or min / max values, etc, etc.
> 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
>
> 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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