Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/8111#issuecomment-130203586
This test is failing even locally:
```
[info] Test test.org.apache.spark.sql.JavaDataFrameSuite.testSampleBy
started
00:38:46.848 WARN org.apache.spark.metrics.MetricsSystem: Using default
name DAGScheduler for source because spark.app.id is not set.
[error] Test test.org.apache.spark.sql.JavaDataFrameSuite.testSampleBy
failed: org.junit.internal.ArrayComparisonFailure: arrays first differed at
element [0]; expected:<[0,5]> but was:<[0,10]>
[error] at
test.org.apache.spark.sql.JavaDataFrameSuite.testSampleBy(JavaDataFrameSuite.java:238)
[error] ...
```
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