Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21898
**[Test build #93685 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/93685/testReport)**
for PR 21898 at commit
[`de517f5`](https://github.com/apache/spark/commit/de517f58ff9fb6cd0c870c9e51bc59d9236dc7fb).
* This patch **fails to build**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `class BarrierCoordinator(`
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