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https://issues.apache.org/jira/browse/HIVE-10835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14566205#comment-14566205
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Chaoyu Tang commented on HIVE-10835:
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Thanks [~vgumashta] for reviewing and committing the patch.
> Concurrency issues in JDBC driver
> ---------------------------------
>
> Key: HIVE-10835
> URL: https://issues.apache.org/jira/browse/HIVE-10835
> Project: Hive
> Issue Type: Bug
> Components: JDBC
> Affects Versions: 0.13.0, 0.14.0, 0.13.1, 0.15.0, 0.14.1, 1.0.0, 1.2.0,
> 1.1.0, 1.0.1, 1.1.1, 0.13
> Reporter: Chaoyu Tang
> Assignee: Chaoyu Tang
> Fix For: 1.3.0
>
> Attachments: HIVE-10835.1.patch, HIVE-10835.2.patch,
> HIVE-10835.3.patch, HIVE-10835.patch
>
>
> Though JDBC specification specifies that "Each Connection object can create
> multiple Statement objects that may be used concurrently by the program", but
> that does not work in current Hive JDBC driver. In addition, there also exist
> race conditions between DatabaseMetaData, Statement and ResultSet as long as
> they make RPC calls to HS2 using same Thrift transport, which happens within
> a connection.
> So we need a connection level lock to serialize all these RPC calls in a
> connection.
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