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https://issues.apache.org/jira/browse/HADOOP-2532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12556436#action_12556436
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stack commented on HADOOP-2532:
-------------------------------
Failure is in an unrelated hbase test. Hopefully this failure doesn't get in
the way of this patch getting reviewed.
Hbase needs this feature in MapFile so the hbase client will work against large
clusters, particularly those undergoing churn: upload or failures, etc.
> Add to MapFile a getClosest that returns key that comes just-before if key
> not present (Currently does just-after only).
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-2532
> URL: https://issues.apache.org/jira/browse/HADOOP-2532
> Project: Hadoop
> Issue Type: New Feature
> Reporter: stack
> Assignee: stack
> Priority: Minor
> Fix For: 0.16.0
>
> Attachments: getclosestbefore-v2.patch, getclosestbefore-v3.patch,
> getclosestbefore.patch
>
>
> The list of regions that make up a table in hbase are effectively kept in a
> mapfile. Regions are identified by the first row contained by that region.
> To find the region that contains a particular row, we need to be able to
> search the mapfile of regions to find the closest matching row that falls
> just-before the searched-for key rather than the just-after that is current
> mapfile getClosest behavior.
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