GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/20359
[SPARK-23186][SQL] Initialize DriverManager first before loading JDBC
Drivers
## What changes were proposed in this pull request?
Since some JDBC Drivers have class initialization code to call
`DriverManager`, we need to initialize DriverManager first in order to avoid
potential executor-side deadlock situations like
[STORM-2527](https://issues.apache.org/jira/browse/STORM-2527).
## How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-23186
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20359.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #20359
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commit 234a637085451b27c7f7c5ca18d94d46c0815d9d
Author: Dongjoon Hyun <dongjoon@...>
Date: 2018-01-23T04:59:31Z
[SPARK-23186][SQL] Initialize DriverManager first before loading Drivers
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