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[SPARK-11672][ML] flaky spark.ml read/write tests
We set `sqlContext = null` in `afterAll`. However, this doesn't change `SQLContext.activeContext` and then `SQLContext.getOrCreate` might use the `SparkContext` from previous test suite and hence causes the error. This PR calls `clearActive` in `beforeAll` and `afterAll` to avoid using an old context from other test suites. cc: yhuai Author: Xiangrui Meng <meng@databricks.com> Closes #9677 from mengxr/SPARK-11672.2.
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- mllib/src/test/java/org/apache/spark/ml/util/JavaDefaultReadWriteSuite.java 2 additions, 2 deletions...a/org/apache/spark/ml/util/JavaDefaultReadWriteSuite.java
- mllib/src/test/scala/org/apache/spark/ml/classification/LogisticRegressionSuite.scala 1 addition, 1 deletion...che/spark/ml/classification/LogisticRegressionSuite.scala
- mllib/src/test/scala/org/apache/spark/ml/feature/BinarizerSuite.scala 1 addition, 1 deletion...st/scala/org/apache/spark/ml/feature/BinarizerSuite.scala
- mllib/src/test/scala/org/apache/spark/ml/util/DefaultReadWriteTest.scala 1 addition, 1 deletion...scala/org/apache/spark/ml/util/DefaultReadWriteTest.scala
- mllib/src/test/scala/org/apache/spark/mllib/util/MLlibTestSparkContext.scala 2 additions, 0 deletions...a/org/apache/spark/mllib/util/MLlibTestSparkContext.scala
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