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https://issues.apache.org/jira/browse/SPARK-5481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14296798#comment-14296798
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Sean Owen commented on SPARK-5481:
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Given that JDBC 4 was introduced 9 years ago, are there JDBC 3 drivers really
in any common use today?
> JdbcRDD requires JDBC 4 APIs, limiting compatible JDBC Drivers
> --------------------------------------------------------------
>
> Key: SPARK-5481
> URL: https://issues.apache.org/jira/browse/SPARK-5481
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.2.0
> Reporter: vijay
>
> JdbcRDD makes unnecessary use of JDBC 4 APIs. To maintain broad jdbc driver
> support, Spark should support JDBC 3.
> The issue is calling isClosed() prior to closing JDBC object. isClosed() is
> part of JDBC 4. It is perfectly safe to close something that is already
> closed - this may throw an exception (which is caught) but has no negative
> side affects.
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