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https://issues.apache.org/jira/browse/HBASE-2038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202088#comment-13202088
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Lars Hofhansl commented on HBASE-2038:
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Unfortunately there is no seeking in the coprocessors, yet. They work more like
a filter of a real scan. Seeking is done one level (or two actually) level
deeper.
Seeking is done in the StoreScanners, coprocessors see RegionScanners.
It is not entirely clear to me where to hook this up in that API.
It might be possible to provide a custom filter to do that. Filters operate at
the storescanner level, and so can (and do) provide seek hints to the calling
scanner.
> Coprocessors: Region level indexing
> -----------------------------------
>
> Key: HBASE-2038
> URL: https://issues.apache.org/jira/browse/HBASE-2038
> Project: HBase
> Issue Type: New Feature
> Components: coprocessors
> Reporter: Andrew Purtell
> Priority: Minor
>
> HBASE-2037 is a good candidate to be done as coprocessor. It also serve as a
> good goalpost for coprocessor environment design -- there should be enough of
> it so region level indexing can be reimplemented as a coprocessor without any
> loss of functionality.
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