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https://issues.apache.org/jira/browse/HIVE-17008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16076653#comment-16076653
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Alexander Kolbasov commented on HIVE-17008:
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There should be no events when the operation failed. This is a bug in the
notification processing.
> HiveMetastore.drop_database can return NPE if database does not exist
> ---------------------------------------------------------------------
>
> Key: HIVE-17008
> URL: https://issues.apache.org/jira/browse/HIVE-17008
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Reporter: Dan Burkert
> Assignee: Dan Burkert
> Attachments: HIVE-17008.0.patch
>
>
> When dropping a non-existent database, the HMS will still fire registered
> {{DROP_DATABASE}} event listeners. This results in an NPE when the listeners
> attempt to deref the {{null}} database parameter.
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