Apache Spark QA

Kubernetes integration test starting URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/47571/

Kubernetes integration test starting URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/47577/

Kubernetes integration test status failure URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/47571/

Kubernetes integration test status failure URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/47577/

**[Test build #143074 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/143074/testReport)** for PR 33934 at commit [`6da39fd`](https://github.com/apache/spark/commit/6da39fd5c44f3666f2e65e9ce159d2ec324bee78). * This patch passes all tests. * This patch merges cleanly. * This patch adds no public classes.

**[Test build #143069 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/143069/testReport)** for PR 33934 at commit [`5ade9f0`](https://github.com/apache/spark/commit/5ade9f0649b3c20d09f6f3e8737588f3616ac8d6). * This patch passes all tests. * This patch merges cleanly. * This patch adds no public classes.

Kubernetes integration test starting URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/47608/

Kubernetes integration test status failure URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/47608/

**[Test build #143104 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/143104/testReport)** for PR 33934 at commit [`1a017c7`](https://github.com/apache/spark/commit/1a017c7879d45cb1caaf3f49e3f4ce26c76116bb). * This patch **fails Spark unit tests**. * This patch merges cleanly. * This patch adds no public classes.

Kubernetes integration test starting URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/47613/