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https://issues.apache.org/jira/browse/HDFS-15126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17018113#comment-17018113
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Ahmed Hussein commented on HDFS-15126:
--------------------------------------
{quote}I went over this class and this is a little hard to debug.
Basically, this goes into a wait for that if it fails it does not say anything
but fail the assert.
I would propose one of the two following options:
Log the timeout for the function.
Add a message in the assertTrue to say what happened.{quote}
[~inigoiri], I agree with you. It was hard to debug the JUnit.
Actually, I used logs and I used JStack to figure out what was going on. My
conclusion is that the test case fails when the execution of the JVM slows
down. As a result the 2 seconds may expire before the report is sent.
I did not find something suspicious in the stack that reveals a deadlock or
indefinite hold to the locks.
The slow down could be caused by scheduling decision of the OS or GC suspending
some threads for a short time of period. Taking into consideration that the
pre-commit build runs JUnit tests concurrently, then another possibility is
that each JUnit will suffer a little bit of slow down due to CPU and concurrent
processes running other JUnit tests.
I increased the timeout period and then I ran the Unit test in a loop. The test
never failed after I increased the timeout to 6 seconds.
Can you please take a look at the patch? It is a very simple change.
> testForcedRegistration fails Intermittently
> -------------------------------------------
>
> Key: HDFS-15126
> URL: https://issues.apache.org/jira/browse/HDFS-15126
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Ahmed Hussein
> Assignee: Ahmed Hussein
> Priority: Major
> Attachments: HDFS-15126.001.patch
>
>
> Recently, {{TestDatanodeRegistration.testForcedRegistration}} started to fail
> in the recommit builds:
> {code:bash}
> [ERROR] Tests run: 6, Failures: 1, Errors: 0, Skipped: 0, Time elapsed:
> 25.333 s <<< FAILURE! - in org.apache.hadoop.hdfs.TestDatanodeRegistration
> [ERROR]
> testForcedRegistration(org.apache.hadoop.hdfs.TestDatanodeRegistration) Time
> elapsed: 11.39 s <<< FAILURE!
> java.lang.AssertionError
> at org.junit.Assert.fail(Assert.java:86)
> at org.junit.Assert.assertTrue(Assert.java:41)
> at org.junit.Assert.assertTrue(Assert.java:52)
> at
> org.apache.hadoop.hdfs.TestDatanodeRegistration.testForcedRegistration(TestDatanodeRegistration.java:385)
> 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:365)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
> at
> org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
> at
> org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
> at
> org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
> at
> org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)
> {code}
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