[ 
https://issues.apache.org/jira/browse/HADOOP-17263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17196973#comment-17196973
 ] 

Steve Loughran commented on HADOOP-17263:
-----------------------------------------

{code}
[INFO] Running 
org.apache.hadoop.fs.s3a.fileContext.ITestS3AFileContextStatistics
[ERROR] Tests run: 3, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 5.332 s 
<<< FAILURE! - in 
org.apache.hadoop.fs.s3a.fileContext.ITestS3AFileContextStatistics
[ERROR] 
testStatistics(org.apache.hadoop.fs.s3a.fileContext.ITestS3AFileContextStatistics)
  Time elapsed: 2.433 s  <<< FAILURE!
java.lang.AssertionError: expected:<512> but was:<395>
        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.hadoop.fs.FCStatisticsBaseTest.testStatistics(FCStatisticsBaseTest.java:108)
        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.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
        at 
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
        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}

S3 London, BTW

> transient ITestS3AFileContextStatistics failure -read buffer not filled
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-17263
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17263
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs, fs/s3, test
>    Affects Versions: 3.4.0
>            Reporter: Steve Loughran
>            Priority: Minor
>
> Transient failure of test suite ITestS3AFileContextStatistics; read() didn't 
> get the full buffer filled up. 
> Note: Something is clearly odd on my dev setup, there's clearly smaller 
> packets coming in. read() is free to return as much bytes as it has, but I've 
> never seen this under-reporting until recently.



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