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https://issues.apache.org/jira/browse/SPARK-23186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16335369#comment-16335369
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Apache Spark commented on SPARK-23186:
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User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/20357
> Loading JDBC Drivers should be syncronized
> ------------------------------------------
>
> Key: SPARK-23186
> URL: https://issues.apache.org/jira/browse/SPARK-23186
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.1
> Reporter: Dongjoon Hyun
> Priority: Major
>
> Since some JDBC Drivers have class initialization code to call
> `DriverManager`, we need to synchronize them to avoid potential deadlock
> situation like STORM-2527.
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