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https://issues.apache.org/jira/browse/HADOOP-18416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17584646#comment-17584646
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ASF GitHub Bot commented on HADOOP-18416:
-----------------------------------------

mehakmeet opened a new pull request, #4806:
URL: https://github.com/apache/hadoop/pull/4806

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   ### Description of PR
   Fixing test failures in ITestS3AIOStatisticsContext, caused by reference 
getting lost due to GC midway the test intermittenly.
   
   ### How was this patch tested?
   Region: `ap-south-1`
   
   `[INFO] Results:  Tests run: 426, Failures: 0, Errors: 0, Skipped: 4`
   `[INFO] Results: Tests run: 1144, Failures: 0, Errors: 0, Skipped: 146`
   `[INFO] Results: Tests run: 124, Failures: 0, Errors: 1, Skipped: 10 ` 
(Timeout)
   ### For code changes:
   
   - [ ] Does the title or this PR starts with the corresponding JIRA issue id 
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   - [ ] Object storage: have the integration tests been executed and the 
endpoint declared according to the connector-specific documentation?
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licensed in a way that is compatible for inclusion under [ASF 
2.0](http://www.apache.org/legal/resolved.html#category-a)?
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> ITestS3AIOStatisticsContext failure
> -----------------------------------
>
>                 Key: HADOOP-18416
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18416
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3, test
>    Affects Versions: 3.3.9
>            Reporter: Steve Loughran
>            Assignee: Mehakmeet Singh
>            Priority: Major
>         Attachments: 
> org.apache.hadoop.fs.s3a.ITestS3AIOStatisticsContext-output.txt
>
>
> test failure running the new ITestS3AIOStatisticsContext. attaching the stack 
> and log file.
> This happened on a large (12 thread) test run, but i can get it to come back 
> intermittently on repeated runs of the whole suite, but never when i just run 
> the single test case.
> {code}
> [ERROR] 
> testThreadIOStatisticsForDifferentThreads(org.apache.hadoop.fs.s3a.ITestS3AIOStatisticsContext)
>   Time elapsed: 3.616 s  <<< FAILURE!
> java.lang.AssertionError: 
> [Counter named stream_write_bytes] 
> Expecting actual not to be null
>         at 
> org.apache.hadoop.fs.statistics.IOStatisticAssertions.lookupStatistic(IOStatisticAssertions.java:160)
>         at 
> org.apache.hadoop.fs.statistics.IOStatisticAssertions.assertThatStatisticLong(IOStatisticAssertions.java:291)
>         at 
> org.apache.hadoop.fs.statistics.IOStatisticAssertions.assertThatStatisticCounter(IOStatisticAssertions.java:306)
>         at 
> org.apache.hadoop.fs.s3a.ITestS3AIOStatisticsContext.assertThreadStatisticsForThread(ITestS3AIOStatisticsContext.java:367)
>         at 
> org.apache.hadoop.fs.s3a.ITestS3AIOStatisticsContext.testThreadIOStatisticsForDifferentThreads(ITestS3AIOStatisticsContext.java:260)
>         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:59)
>         at 
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
>         at 
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
>         at 
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
>         at 
> org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
>         at 
> org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
>         at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:61)
>         at 
> org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:288)
>         at 
> org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:282)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>         at java.lang.Thread.run(Thread.java:750)
> {code}
> I'm suspecting some race condition *or* gc pressure is releasing that 
> reference in the worker thread.
> proposed test changes
> * worker thread changes its thread ID for the logs
> * stores its thread context into a field, so there's guarantee of no GC
> * logs more as it goes along.



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