Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/9677#issuecomment-156631866
@mengxr I just saw a failure that seems related to this PR at
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/45914/consoleFull
```
[info] Test
org.apache.spark.ml.util.JavaDefaultReadWriteSuite.testDefaultReadWrite started
[error] Test
org.apache.spark.ml.util.JavaDefaultReadWriteSuite.testDefaultReadWrite failed:
java.lang.IllegalStateException: Cannot call methods on a stopped SparkContext.
[error] This stopped SparkContext was created at:
[error]
[error] org.apache.spark.SparkContext.<init>(SparkContext.scala:82)
[error]
org.apache.spark.mllib.util.MLlibTestSparkContext$class.beforeAll(MLlibTestSparkContext.scala:34)
[error]
org.apache.spark.mllib.optimization.GradientDescentSuite.beforeAll(GradientDescentSuite.scala:65)
[error]
org.scalatest.BeforeAndAfterAll$class.beforeAll(BeforeAndAfterAll.scala:187)
[error]
org.apache.spark.mllib.optimization.GradientDescentSuite.beforeAll(GradientDescentSuite.scala:65)
[error]
org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:253)
[error]
org.apache.spark.mllib.optimization.GradientDescentSuite.run(GradientDescentSuite.scala:65)
[error]
org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:462)
[error]
org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:671)
[error] sbt.ForkMain$Run$2.call(ForkMain.java:294)
[error] sbt.ForkMain$Run$2.call(ForkMain.java:284)
[error] java.util.concurrent.FutureTask.run(FutureTask.java:262)
[error]
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
[error]
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
[error] java.lang.Thread.run(Thread.java:745)
[error]
[error] The currently active SparkContext was created at:
[error]
[error]
org.apache.spark.api.java.JavaSparkContext.<init>(JavaSparkContext.scala:65)
[error]
org.apache.spark.ml.util.JavaDefaultReadWriteSuite.setUp(JavaDefaultReadWriteSuite.java:39)
[error] sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error]
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[error]
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] java.lang.reflect.Method.invoke(Method.java:606)
[error]
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
[error]
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
[error]
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
[error]
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
[error]
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
[error] org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
[error]
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
[error]
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
[error] org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
[error] org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
[error] org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
[error] org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
[error] org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
[error] org.junit.runners.ParentRunner.run(ParentRunner.java:309)
[error] , took 0.212 sec
[error] at
org.apache.spark.SparkContext.org$apache$spark$SparkContext$$assertNotStopped(SparkContext.scala:106)
[error] at
org.apache.spark.SparkContext$$anonfun$parallelize$1.apply(SparkContext.scala:732)
[error] at
org.apache.spark.SparkContext$$anonfun$parallelize$1.apply(SparkContext.scala:731)
[error] at
org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:150)
[error] at
org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:111)
[error] at
org.apache.spark.SparkContext.withScope(SparkContext.scala:717)
[error] at
org.apache.spark.SparkContext.parallelize(SparkContext.scala:731)
[error] at
org.apache.spark.ml.util.DefaultParamsWriter$.saveMetadata(ReadWrite.scala:209)
[error] at
org.apache.spark.ml.util.DefaultParamsWriter.saveImpl(ReadWrite.scala:181)
[error] at org.apache.spark.ml.util.Writer.save(ReadWrite.scala:90)
[error] at
org.apache.spark.ml.util.Writable$class.save(ReadWrite.scala:130)
[error] at
org.apache.spark.ml.util.MyParams.save(DefaultReadWriteTest.scala:69)
[error] at
org.apache.spark.ml.util.JavaDefaultReadWriteSuite.testDefaultReadWrite(JavaDefaultReadWriteSuite.java:59)
[error] ...
```
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