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https://issues.apache.org/jira/browse/FLINK-1207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14216059#comment-14216059
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ASF GitHub Bot commented on FLINK-1207:
---------------------------------------
Github user uce commented on the pull request:
https://github.com/apache/incubator-flink/pull/211#issuecomment-63452309
Looks good to me :) +1
> Switch ContextEnvironment to Environment factory
> ------------------------------------------------
>
> Key: FLINK-1207
> URL: https://issues.apache.org/jira/browse/FLINK-1207
> Project: Flink
> Issue Type: Bug
> Components: Java API
> Affects Versions: 0.8-incubating
> Reporter: Stephan Ewen
> Fix For: 0.8-incubating
>
>
> We implement the "context dependent switching" of the execution environments
> (cluster / local / test) with static variables in the ExecutionEnvironment.
> That means that these environments are potentially shared between multiple
> threads that run programs (also in case where they run one after the other).
> This may lead to exceptions, as we sometimes see in the tests, when using
> forked test execution: The later test in the same JVM may access the same
> environment object as the prior ones. In particular, we see that half
> finished programs may still be associated with the execution environment,
> such that mixes between programs occur, producing hard to understand cast
> exceptions (see trace below)
> This is so far only relevant to tests with forked execution, but may become
> relevant to users that build different programs at the same time.
> I propose to change the static members from environments to environment
> factories. That way, we can switch type of environment depending on the
> context as before, and we guarantee that each call to
> "ExecutionEnvironment.getEnvironment()" returns a dedicated and fresh
> environment.
> Running
> org.apache.flink.api.scala.operators.translation.DistinctTranslationTest
> java.lang.ClassCastException:
> org.apache.flink.api.common.operators.base.DeltaIterationBase cannot be cast
> to org.apache.flink.api.common.operators.base.GroupReduceOperatorBase
> at
> org.apache.flink.api.scala.operators.translation.DistinctTranslationTest.testCombinable(DistinctTranslationTest.scala:39)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:483)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:264)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:124)
> at
> org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:200)
> at
> org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:153)
> at
> org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)
> Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.027 sec <<<
> FAILURE! - in
> org.apache.flink.api.scala.operators.translation.DistinctTranslationTest
> testCombinable(org.apache.flink.api.scala.operators.translation.DistinctTranslationTest)
> Time elapsed: 0.024 sec <<< FAILURE!
> java.lang.AssertionError:
> org.apache.flink.api.common.operators.base.DeltaIterationBase cannot be cast
> to org.apache.flink.api.common.operators.base.GroupReduceOperatorBase
> at org.junit.Assert.fail(Assert.java:88)
> at
> org.apache.flink.api.scala.operators.translation.DistinctTranslationTest.testCombinable(DistinctTranslationTest.scala:46)
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