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https://issues.apache.org/jira/browse/HBASE-8355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13634258#comment-13634258
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Jesse Yates commented on HBASE-8355:
------------------------------------
>From the patch Andrew was referencing on github in the description, here's the
>issue:
{code}
/**
+ * We override this method to ensure that any scanner from a previous
coprocessor is returned. The
+ * default behavior is to return <tt>null</tt>, which completely hoses any
other coprocessors
+ * setup before, making ordering of coprocessors very important. By
returning the passed scanner,
+ * we can avoid easy to make configuration errors.
+ */
{code}
> 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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