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https://issues.apache.org/jira/browse/HIVE-26036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17511718#comment-17511718
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Yu Weiqiang commented on HIVE-26036:
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Merged to master.
[~Marton Bod], thank you for the review!
> NPE caused by getMTable() in ObjectStore
> ----------------------------------------
>
> Key: HIVE-26036
> URL: https://issues.apache.org/jira/browse/HIVE-26036
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 3.1.2, 4.0.0
> Reporter: Yu Weiqiang
> Assignee: Yu Weiqiang
> Priority: Minor
> Labels: pull-request-available
> Attachments: NPE_From_getMTable.png
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> *Issue*
> Some api in ObjectStore invoke getMTable() but not check that if the returned
> value is null, which caused the NPE, like addPartitions(), addPartition(),
> alterPartition() et.
> *Reason*
> Such api described above will check that whether the table exists in
> HMSHandler (first check), but if the table is dropped by other threads after
> the first check, the NPE will happen.
> The simple idea is that we can check the table each time we get from
> getMTable().
> *Stack example*
> !NPE_From_getMTable.png!
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