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https://issues.apache.org/jira/browse/HADOOP-16897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Steve Loughran updated HADOOP-16897:
------------------------------------
Component/s: test
> Sort fields in ReflectionUtils.java
> -----------------------------------
>
> Key: HADOOP-16897
> URL: https://issues.apache.org/jira/browse/HADOOP-16897
> Project: Hadoop Common
> Issue Type: Bug
> Components: test, util
> Affects Versions: 3.3.0
> Reporter: cpugputpu
> Priority: Minor
>
> The tests in
> _org.apache.hadoop.metrics2.impl.TestMetricsSystemImpl#testInitFirstVerifyCallBacks_
> and
> _org.apache.hadoop.metrics2.impl.TestMetricsSystemImpl#testInitFirstVerifyStopInvokedImmediately_
> can fail.
> java.lang.AssertionError:
> Element 0 for metrics expected:<MetricCounterLong{info=MetricsInfoImpl
> {name=C1, description=C1 desc}
> , value=1}>
> but was:<MetricGaugeLong{info=MetricsInfoImpl
> {name=G1, description=G1 desc}
> , value=2}>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotEquals(Assert.java:834)
> at org.junit.Assert.assertEquals(Assert.java:118)
> at org.apache.hadoop.test.MoreAsserts.assertEquals(MoreAsserts.java:60)
> at
> org.apache.hadoop.metrics2.impl.TestMetricsSystemImpl.checkMetricsRecords(TestMetricsSystemImpl.java:439)
> at
> org.apache.hadoop.metrics2.impl.TestMetricsSystemImpl.testInitFirstVerifyCallBacks(TestMetricsSystemImpl.java:178)
>
> The root cause of this failure can be analyzed in the following stack trace:
> _java.lang.Class.*getDeclaredFields*(Class.java:1916)_
>
> _org.apache.hadoop.util.ReflectionUtils.getDeclaredFieldsIncludingInherited(ReflectionUtils.java:353)_
>
> _org.apache.hadoop.metrics2.lib.MetricsSourceBuilder.<init>(MetricsSourceBuilder.java:68)_
>
> _org.apache.hadoop.metrics2.lib.MetricsAnnotations.newSourceBuilder(MetricsAnnotations.java:43)_
>
> _org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:223)_
>
> _org.apache.hadoop.metrics2.impl.TestMetricsSystemImpl.testInitFirstVerifyCallBacks(TestMetricsSystemImpl.java:156)_
> The specification about getDeclaredFields() says that "the elements in the
> returned array are not sorted and are not in any particular order". The
> documentation is here for your reference:
> [https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html#getDeclaredFields--]
> And the behaviour might be different for different JVM versions or vendors
>
> The fix is to sort the fields returned by getDeclaredFields() so that the
> non-deterministic behaviour can be eliminated completely. In this way, the
> test becomes more stable and it will not suffer from the failure above any
> more.
>
>
>
>
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