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https://issues.apache.org/jira/browse/KUDU-3322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Bukor reassigned KUDU-3322:
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Assignee: Abhishek Chennaka
> Handle to situation of last seen event ID in Kudu master being more than the
> latest event ID from HMS
> -----------------------------------------------------------------------------------------------------
>
> Key: KUDU-3322
> URL: https://issues.apache.org/jira/browse/KUDU-3322
> Project: Kudu
> Issue Type: Improvement
> Reporter: Abhishek Chennaka
> Assignee: Abhishek Chennaka
> Priority: Minor
> Fix For: 1.17.0
>
>
> Came across a scenario where HMS database was lost and restored from an old
> backup which reset the latest event ID (monotonically increasing integer) in
> HMS to a lower value than what it should be.
> Since Kudu master has a last seen event ID greater than the one in HMS
> currently, it could not process any new events generated. For example, Kudu
> table deletion was not happening as the Kudu master expects an event ID which
> is higher than the one it has last seen but the event ID in HMS for the table
> deletion is less than the one in the Kudu master.
> This also causes discrepancy between the metadata in HMS and Kudu masters. It
> would be better if the Kudu master upon startup does the comparison of the
> last seen event ID and latest event ID in HMS and crash if the one in HMS is
> lower with a helpful message/clarifying question like:
> {code:java}
> Found the last seen event ID in the local Kudu master to be greater than the
> latest event ID in HMS. Was there any backup or restore done on HMS
> recently?{code}
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