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https://issues.apache.org/jira/browse/HBASE-5304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198427#comment-13198427
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Lars Hofhansl commented on HBASE-5304:
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@Jesse: Thanks for the comments.
* Good point on making PrefixSplitKeyPolicy it's own class. I'll do that. Need
to make it a bit nicer then. Or I can add a section to the HBase book
(reference guide) with PrefixSplitKeyPolicy as an example.
* The splitKey is always validated against the region before the actual split.
If it is not valid you get an error message (see HRegion.checkSplit and
SplitTransaction.prepare) and the split is not performed. Falling back to the
default instead might invalidate other assumptions that the application code
had based on the provided SplitPolicy. Generally I see this as a server
extension. If you wanted to call System.exit() from the code you can, and it'll
kill your server on every split :)
* RegionSplitPolicy is already optionally loaded per table as well as per
configuration (see RegionSplitPolicy.getSplitPolicyClass)
I think shell support would be for generally for setting HTableDescriptor
values. I have some ideas, but some refactoring would be needed to get it
right, I'd rather do that in another jira.
> Pluggable split key policy
> --------------------------
>
> Key: HBASE-5304
> URL: https://issues.apache.org/jira/browse/HBASE-5304
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.94.0
>
> Attachments: 5304-v4.txt
>
>
> We need a way to specify custom policies to determine split keys.
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