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https://issues.apache.org/jira/browse/HBASE-1106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack reassigned HBASE-1106:
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Assignee: Michael Gottesman
> Expose getClosestRowBefore in HTable
> ------------------------------------
>
> Key: HBASE-1106
> URL: https://issues.apache.org/jira/browse/HBASE-1106
> Project: Hadoop HBase
> Issue Type: New Feature
> Reporter: Michael Gottesman
> Assignee: Michael Gottesman
> Priority: Minor
> Fix For: 0.19.0
>
> Attachments: hbase-1106.patch
>
>
> Exposes the functionality of getClosestRowBefore in HTable. It can be useful
> in combination with atomic check and save in the following manner to create a
> global auto-id creation scheme:
> Presteps:
> 1. In your application, have a reserved value.
> 2. Create a reverse index table of your main table (best algorithm in my
> opinion is bitwise-not of key and append max-utf8 character)
> 3. Have an offset row in said reverse index table that your application does
> not allow to be set (usually this will be a bitwise inverse of some prefix +
> maximum UTF-8 character)
> Algorithm:
> 1. Use getClosestRowBefore to find the last created row before the offset
> (which will be the last row created)
> 2. Deinverse key and then increment the row key of the row returned by
> getClosestRowBefore
> 3. Attempt to reserve the row key with checkAndSave checking if reserved has
> been set.
> 4. If it fails try again.
> Attached is a patch to expose getClosestRowBefore. Comments are of course
> always welcome =).
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