Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/23119
The previous successful one was `sbt`.
The current on-going one fails with another flacky test,
[SPARK-25903](https://issues.apache.org/jira/browse/SPARK-25903).
```
BarrierTaskContextSuite:
...
- throw exception if the number of barrier() calls are not the same on
every task *** FAILED ***
```
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