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https://issues.apache.org/jira/browse/HIVE-5268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13802187#comment-13802187
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Brock Noland commented on HIVE-5268:
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The patch uses assert. Java assertions are not enabled by default. Do we really
want that check disabled the vast majority of the time?
> HiveServer2 accumulates orphaned OperationHandle objects when a client fails
> while executing query
> --------------------------------------------------------------------------------------------------
>
> Key: HIVE-5268
> URL: https://issues.apache.org/jira/browse/HIVE-5268
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Reporter: Vaibhav Gumashta
> Assignee: Thiruvel Thirumoolan
> Fix For: 0.13.0
>
> Attachments: HIVE-5268_prototype.patch
>
>
> When queries are executed against the HiveServer2 an OperationHandle object
> is stored in the OperationManager.handleToOperation HashMap. Currently its
> the duty of the JDBC client to explicitly close to cleanup the entry in the
> map. But if the client fails to close the statement then the OperationHandle
> object is never cleaned up and gets accumulated in the server.
> This can potentially cause OOM on the server over time. This also can be used
> as a loophole by a malicious client to bring down the Hive server.
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