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https://issues.apache.org/jira/browse/HBASE-5229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-5229:
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Attachment: 5229-scanner-seekto.txt
Here's a patch *demonstrating* that approach.
A scanner can be passed a start KeyValue. It will seek to that KeyValue.
The client is responsible to create a suitable KeyValue for seeking (see the
included test).
Together with scanner batching this allows for pretty flexible intra row
scanning.
For simplicity the stopRow is also enforced allowing only intra-row scanning
(that is just so that the change it ClientScanner is small - otherwise it'd
need to remember the seekTo for retry but still allow to scan to the next
region by setting the startRow).
If folks like this approach, I'll make a nicer patch and change the title of
this jira.
> Support atomic region operations
> --------------------------------
>
> Key: HBASE-5229
> URL: https://issues.apache.org/jira/browse/HBASE-5229
> Project: HBase
> Issue Type: New Feature
> Components: client, regionserver
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.94.0
>
> Attachments: 5229-scanner-seekto.txt, 5229.txt
>
>
> As discussed (at length) on the dev mailing list with the HBASE-3584 and
> HBASE-5203 committed, supporting atomic cross row transactions within a
> region becomes simple.
> I am aware of the hesitation about the usefulness of this feature, but we
> have to start somewhere.
> Let's use this jira for discussion, I'll attach a patch (with tests)
> momentarily to make this concrete.
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