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https://issues.apache.org/jira/browse/HBASE-5229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189434#comment-13189434
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Lars Hofhansl commented on HBASE-5229:
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That is true when it comes to storage.
However our (current) API is mostly row based. There is no way to start or stop
a stop a scan at a column, there are many assumptions about rows baked into the
scanner, etc. I don't think ColumnRangeFilter would be good enough here.
Declaring a prefix and honoring it during splitting seems simpler and more in
line with our current API and (probably?) what a user would expect.
It is another avenue, though. For example we can add Scan.set{Start|Stop}Key
(where we can present prefixes of the full key, rather than just the row key),
and handle it accordingly at the server. Would also need a nextKeyValue (or
nextColumn or something) method on ResultScanner along with the server code
that does this efficiently.
> 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.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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