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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1207) Switch ContextEnvironment to Environment factory
Date Tue, 18 Nov 2014 11:28:33 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14216079#comment-14216079
] 

ASF GitHub Bot commented on FLINK-1207:
---------------------------------------

Github user uce commented on the pull request:

    https://github.com/apache/incubator-flink/pull/211#issuecomment-63456556
  
    Merging this.


> 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
>            Assignee: 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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