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https://issues.apache.org/jira/browse/HADOOP-2604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559322#action_12559322
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Bryan Duxbury commented on HADOOP-2604:
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It would also be nice to get a row count quickly from a MapFile, or at least
check if the MapFile was empty. Can't do that today.
> [hbase] Create an HBase-specific MapFile implementation
> -------------------------------------------------------
>
> Key: HADOOP-2604
> URL: https://issues.apache.org/jira/browse/HADOOP-2604
> Project: Hadoop
> Issue Type: Improvement
> Components: contrib/hbase
> Reporter: Bryan Duxbury
> Priority: Minor
>
> Today, HBase uses the Hadoop MapFile class to store data persistently to
> disk. This is convenient, as it's already done (and maintained by other
> people :). However, it's beginning to look like there might be possible
> performance benefits to be had from doing an HBase-specific implementation of
> MapFile that incorporated some precise features.
> This issue should serve as a place to track discussion about what features
> might be included in such an implementation.
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