Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21221
**[Test build #91424 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/91424/testReport)**
for PR 21221 at commit
[`7879e66`](https://github.com/apache/spark/commit/7879e66eed22cfd4dff2367c0ee3138369243711).
* This patch **fails to build**.
* This patch **does not merge cleanly**.
* This patch adds the following public classes _(experimental)_:
* `sealed trait MetricGetter `
* `abstract class MemoryManagerMetricGetter(f: MemoryManager => Long)
extends MetricGetter `
* `abstract class MBeanMetricGetter(mBeanName: String) extends
MetricGetter `
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