Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/19472
**[Test build #88479 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/88479/testReport)**
for PR 19472 at commit
[`d09c629`](https://github.com/apache/spark/commit/d09c6295aaca56e7940906b1ca60131f9a30ee9b).
* 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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