Github user SparkQA commented on the issue: https://github.com/apache/spark/pull/19472 **[Test build #87946 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/87946/testReport)** for PR 19472 at commit [`f9fe320`](https://github.com/apache/spark/commit/f9fe320530ca26c5c6da5ba9e69abf9b9ffa1295). * This patch **fails Spark unit tests**. * This patch merges cleanly. * This patch adds the following public classes _(experimental)_: * `public abstract class MemoryBlock implements Serializable `
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