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https://issues.apache.org/jira/browse/METRON-1544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16476678#comment-16476678
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ASF GitHub Bot commented on METRON-1544:
----------------------------------------
Github user ben-manes commented on the issue:
https://github.com/apache/metron/pull/1015
Cache eviction is performed asynchronously by default using the FJP common
pool. For testing you can set `executor(Runnable::run)` and it will be on the
calling thread. The penalty is small so it’s sometimes used in practice anyway.
The eviction is not LRU and has a random seed to guard against HashDoS
attacks. This means that which entry is not predictable without forcing the
seed, which is not exposed. Typically only the cache’s test should do that.
You’re code shouldn’t make assumptions on what is evicted as we will try to
maximize the hit rate using various techniques.
> Flaky test:
> org.apache.metron.stellar.common.CachingStellarProcessorTest#testCaching
> ------------------------------------------------------------------------------------
>
> Key: METRON-1544
> URL: https://issues.apache.org/jira/browse/METRON-1544
> Project: Metron
> Issue Type: Bug
> Affects Versions: 0.4.3
> Environment: #uname -a
> Linux 60a83dc7a2ce 4.4.0-112-generic #135-Ubuntu SMP Fri Jan 19 11:48:36 UTC
> 2018 x86_64 x86_64 x86_64 GNU/Linux
> Reporter: Pravin Dsilva
> Assignee: Nick Allen
> Priority: Major
>
> command used: mvn test
> The test fails intermittently on master branch.
> {code:java}
> Running org.apache.metron.stellar.common.CachingStellarProcessorTest
> Tests run: 2, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.054 sec <<<
> FAILURE! - in org.apache.metron.stellar.common.CachingStellarProcessorTest
> testCaching(org.apache.metron.stellar.common.CachingStellarProcessorTest)
> Time elapsed: 0.053 sec <<< FAILURE!
> java.lang.AssertionError: expected:<6> but was:<4>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotEquals(Assert.java:834)
> at org.junit.Assert.assertEquals(Assert.java:645)
> at org.junit.Assert.assertEquals(Assert.java:631)
> at
> org.apache.metron.stellar.common.CachingStellarProcessorTest.testCaching(CachingStellarProcessorTest.java:73)
> 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:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:283)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:173)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:128)
> at
> org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203)
> at
> org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155)
> at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)
> {code}
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