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https://issues.apache.org/jira/browse/SPARK-6507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cheng Lian resolved SPARK-6507.
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Resolution: Duplicate
> Create separate Hive Driver instance for each SQL query in HiveThriftServer2
> ----------------------------------------------------------------------------
>
> Key: SPARK-6507
> URL: https://issues.apache.org/jira/browse/SPARK-6507
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.0.2, 1.1.1, 1.2.1, 1.3.0
> Reporter: Cheng Lian
>
> In the current implementation of HiveThriftServer2, Hive {{Driver}} instances
> are cached and reused among queries. However, {{Driver}} is not thread-safe,
> and may cause racing conditions. In SPARK-4908, we synchronized
> {{HiveContext.runHive}} to avoid this issue, but this affects concurrency
> negatively, because no two native commands can be executed concurrently. This
> is pretty bad for heavy commands like ANALYZE.
> Please refer [this
> comment|https://issues.apache.org/jira/browse/SPARK-4908?focusedCommentId=14264469&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14264469]
> in SPARK-4908 for details.
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