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https://issues.apache.org/jira/browse/HBASE-7310?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu updated HBASE-7310:
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Summary: Allow region server UI to display critical errors so that user
doesn't have to peruse region server log (was: Allow region server UI to
display critical errors such as those corresponding to ClassNotFoundException
when loading user coprocessors)
Updated subject of JIRA.
Will update description once a concrete use case comes up.
> Allow region server UI to display critical errors so that user doesn't have
> to peruse region server log
> -------------------------------------------------------------------------------------------------------
>
> Key: HBASE-7310
> URL: https://issues.apache.org/jira/browse/HBASE-7310
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
>
> When working on HBASE-7205, I logged the following comment:
> The reason for coprocessor loading to tolerate ClassNotFoundException is that
> the user table region where jar file and classname mismatch can reside on any
> of the region servers in the cluster. If we don't tolerate the mismatch, it
> is possible that all region servers in the cluster abort.
> I think we should allow region server UI to display critical errors such as
> those corresponding to ClassNotFoundException when loading user coprocessors.
> This would help user quickly identify issues without forcing them to scan
> region server log(s).
> Region server can also send such critical errors to master so that master can
> aggregate the errors and give user a central place to check critical errors.
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