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https://issues.apache.org/jira/browse/CASSANDRA-17884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17609611#comment-17609611
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Ekaterina Dimitrova commented on CASSANDRA-17884:
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The issue is hit very rarely in this test with JDK11 on 4.0+.
> Test failure: o.a.c.repair.RepairJobTest.testNoTreesRetainedAfterDifference
> ---------------------------------------------------------------------------
>
> Key: CASSANDRA-17884
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17884
> Project: Cassandra
> Issue Type: Bug
> Components: Test/unit
> Reporter: Andres de la Peña
> Priority: Normal
> Fix For: 4.0.x, 4.1.x, 4.x
>
>
> The unit test
> {{org.apache.cassandra.repair.RepairJobTest#testNoTreesRetainedAfterDifference}}
> seems to be slightly flaky at least in 4.0. We haven't seen it failing on
> Butler, but after [a failure on a patch
> branch|https://app.circleci.com/pipelines/github/jacek-lewandowski/cassandra/281/workflows/e6094c00-b611-4772-9772-205f4c76ecba/jobs/2126/tests],
> this repeated run shows a 0.28% flakiness:
> *
> https://app.circleci.com/pipelines/github/adelapena/cassandra/2076/workflows/8adbfe99-afb5-43af-84ad-43df2a2a86e2/jobs/20816/tests
> *
> https://app.circleci.com/pipelines/github/adelapena/cassandra/2076/workflows/e550d8c2-7c35-4326-bd95-6909978d344b/jobs/20817/tests
> {code}
> java.lang.reflect.InaccessibleObjectException: Unable to make field private
> jdk.internal.platform.cgroupv1.SubSystem$MemorySubSystem
> jdk.internal.platform.cgroupv1.Metrics.memory accessible: module java.base
> does not "opens jdk.internal.platform.cgroupv1" to unnamed module @157853da
> at
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:340)
> at
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280)
> at
> java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:176)
> at java.base/java.lang.reflect.Field.setAccessible(Field.java:170)
> at org.github.jamm.MemoryMeter.addFieldChildren(MemoryMeter.java:330)
> at org.github.jamm.MemoryMeter.measureDeep(MemoryMeter.java:269)
> at
> org.apache.cassandra.utils.ObjectSizes.measureDeep(ObjectSizes.java:216)
> at
> org.apache.cassandra.repair.RepairJobTest.testNoTreesRetainedAfterDifference(RepairJobTest.java:271)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> {code}
> Flakiness is really low but the failure is clearly reproducible in j11.
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