GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/20357
[SPARK-23186][SQL] Loading JDBC Drivers should be synchronized
## What changes were proposed in this pull request?
Since some JDBC Drivers have class initialization code to call
`DriverManager`, we need to synchronize them to avoid potential executor-side
deadlock situations like
[STORM-2527](https://issues.apache.org/jira/browse/STORM-2527).
## How was this patch tested?
This only extends the coverage of synchronized block from a part to the
whole function.
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/20357.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 #20357
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commit f8c3eac6ddfdb94e1e5153da64dcfb706e191ba8
Author: Dongjoon Hyun <dongjoon@...>
Date: 2018-01-23T04:11:01Z
[SPARK-23186][SQL] Loading JDBC Drivers should be synchronized
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