Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/22327
The 2.7.x branches updates are generally all security plus some fixes for
JVM/JDK regressions.
without looking at the details, you can assume that the regression will be
related to one of these and for that reason, wouldn't recommend rolling back.
Better to find the problem and come up with a fix or workaround.
Created [HADOOP-15722](https://issues.apache.org/jira/browse/HADOOP-15722)
to cover this.
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