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https://issues.apache.org/jira/browse/HBASE-8355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13634286#comment-13634286
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Lars Hofhansl commented on HBASE-8355:
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This is really my fault. I needed coprocessor hooks for compactions that could
return a new scanner, but also indicate when the default is used, returning
null to indicate using the default seemed the best approach then... I did not
think about chaining. My bad.
Would need to think about a good API, that can:
# return a scanner when needed from the hook
# indicate that the default action should be used
# allow for chaining
> BaseRegionObserver#preCompactScannerOpen returns null
> -----------------------------------------------------
>
> Key: HBASE-8355
> URL: https://issues.apache.org/jira/browse/HBASE-8355
> Project: HBase
> Issue Type: Bug
> Components: Coprocessors
> Affects Versions: 0.98.0, 0.94.8, 0.95.1
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Attachments: 8355-0.94.patch, 8355.patch
>
>
> As pointed out in https://github.com/forcedotcom/phoenix/pull/131,
> BaseRegionObserver#preCompactScannerOpen returns null by default, which hoses
> any coprocessors down the line, making override of this method mandatory. The
> fix is trivial, patch coming momentarily.
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