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https://issues.apache.org/jira/browse/HIVE-17008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16075763#comment-16075763
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Mohit Sabharwal commented on HIVE-17008:
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Thanks, [~dan_impala_9180]. There are two flavors of listeners in each DDL
operation, one which runs in the same transaction as the DDL event (notify only
upon success) and one which run outside the transaction (can notify failed DDL
operations as well). Where exactly is the NPE - I assume somewhere down the
notifyEvent stack ?
+ [~spena], who has worked on this recently.
> 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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