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https://issues.apache.org/jira/browse/HBASE-16637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15836644#comment-15836644
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Ted Yu commented on HBASE-16637:
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A filter would give us speed up as well.
> Add endpoint coprocessor to speed up queries to backup table
> ------------------------------------------------------------
>
> Key: HBASE-16637
> URL: https://issues.apache.org/jira/browse/HBASE-16637
> Project: HBase
> Issue Type: Improvement
> Reporter: Ted Yu
> Labels: backup
>
> Currently BackupSystemTable uses HTable API to query backup table.
> In many scenarios, this is inefficient because filtering is done at client
> side.
> With more information being recorded in hbase:backup table (such as bulk load
> descriptor - see HBASE-14417), we should perform filtering on server side.
> An endpoint coprocessor would serve this purpose.
> e.g. without endpoint coprocessor, incremental restore would either bring all
> bulk load descriptors to client followed by filtering for relevant tables or,
> issue two queries - one for rows related to the tables being restored and
> another query to bring down the bulk load descriptors.
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