Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21221
**[Test build #91802 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/91802/testReport)**
for PR 21221 at commit
[`2662f6f`](https://github.com/apache/spark/commit/2662f6f9c6a7c34cea34b748f6735eb1625b73cb).
* This patch **fails Spark unit tests**.
* This patch **does not merge cleanly**.
* This patch adds the following public classes _(experimental)_:
* `class PeakMemoryMetricsDeserializer extends
JsonDeserializer[Option[Array[Long]]] `
* `class PeakMemoryMetricsSerializer extends
JsonSerializer[Option[Array[Long]]] `
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