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From "Bryan Duxbury (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2604) [hbase] Create an HBase-specific MapFile implementation
Date Wed, 16 Jan 2008 21:54:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559673#action_12559673
] 

Bryan Duxbury commented on HADOOP-2604:
---------------------------------------

Sometimes, it'd be nice to iterate on the keys of a MapFile without actually reading the data.
For instance, check out HStore#getClosestRowBefore - this seeks around checking keys and doesn't
even use the value once it's been found. Every read to the underlying SequenceFile for that
value is wasted.

> [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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