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https://issues.apache.org/jira/browse/CASSANDRA-15313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17031282#comment-17031282
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David Capwell commented on CASSANDRA-15313:
-------------------------------------------
"it" is the failing case; sorry for the confusion. By lowering the examples we
will need to run the test more before we see the failing case.
bq. I ran at 4G and it still failed at 200 examples (I didn't try any other
sizes though)
This then sounds like the generators produce too much garbage. I took a stab at
fixing it and attaching a hack patch to the JIRA to show; basically move away
from String since that produces a ton of garbage. With the patch and a failing
test case, the test completes in 200ms (900ms if you run in isolation).
[~samt] don't know the test well but when I run it (not patched) in a debugger
with 1000 examples, I see the call
https://github.com/apache/cassandra/blob/trunk/test/unit/org/apache/cassandra/transport/frame/checksum/ChecksummingTransformerTest.java#L118
2 times; so only 2 out of 1k runs hits that check. My patch doesn't hit it
(after a few runs), but could always tweak the bytes to match the expected
input.
> Fix flaky - ChecksummingTransformerTest -
> org.apache.cassandra.transport.frame.checksum.ChecksummingTransformerTest
> -------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-15313
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15313
> Project: Cassandra
> Issue Type: Bug
> Components: Test/dtest
> Reporter: Vinay Chella
> Assignee: Brandon Williams
> Priority: Normal
> Fix For: 4.0-alpha
>
>
> During the recent runs, this test appears to be flaky.
> Example failure:
> [https://circleci.com/gh/vinaykumarchella/cassandra/459#tests/containers/94]
> corruptionCausesFailure-compression -
> org.apache.cassandra.transport.frame.checksum.ChecksummingTransformerTest
> {code:java}
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:57)
> at java.nio.ByteBuffer.allocate(ByteBuffer.java:335)
> at org.quicktheories.impl.Precursor.<init>(Precursor.java:17)
> at
> org.quicktheories.impl.ConcreteDetachedSource.<init>(ConcreteDetachedSource.java:8)
> at
> org.quicktheories.impl.ConcreteDetachedSource.detach(ConcreteDetachedSource.java:23)
> at org.quicktheories.generators.Retry.generate(CodePoints.java:51)
> at
> org.quicktheories.generators.Generate.lambda$intArrays$10(Generate.java:190)
> at
> org.quicktheories.generators.Generate$$Lambda$17/1847008471.generate(Unknown
> Source)
> at org.quicktheories.core.DescribingGenerator.generate(Gen.java:255)
> at org.quicktheories.core.Gen.lambda$map$0(Gen.java:36)
> at org.quicktheories.core.Gen$$Lambda$20/71399214.generate(Unknown
> Source)
> at org.quicktheories.core.Gen.lambda$map$0(Gen.java:36)
> at org.quicktheories.core.Gen$$Lambda$20/71399214.generate(Unknown
> Source)
> at org.quicktheories.core.Gen.lambda$mix$10(Gen.java:184)
> at org.quicktheories.core.Gen$$Lambda$45/802243390.generate(Unknown
> Source)
> at org.quicktheories.core.Gen.lambda$flatMap$5(Gen.java:93)
> at org.quicktheories.core.Gen$$Lambda$48/363509958.generate(Unknown
> Source)
> at
> org.quicktheories.dsl.TheoryBuilder4.lambda$prgnToTuple$12(TheoryBuilder4.java:188)
> at
> org.quicktheories.dsl.TheoryBuilder4$$Lambda$40/2003496028.generate(Unknown
> Source)
> at org.quicktheories.core.DescribingGenerator.generate(Gen.java:255)
> at org.quicktheories.core.FilteredGenerator.generate(Gen.java:225)
> at org.quicktheories.core.Gen.lambda$map$0(Gen.java:36)
> at org.quicktheories.core.Gen$$Lambda$20/71399214.generate(Unknown
> Source)
> at org.quicktheories.impl.Core.generate(Core.java:150)
> at org.quicktheories.impl.Core.shrink(Core.java:103)
> at org.quicktheories.impl.Core.run(Core.java:39)
> at org.quicktheories.impl.TheoryRunner.check(TheoryRunner.java:35)
> at org.quicktheories.dsl.TheoryBuilder4.check(TheoryBuilder4.java:150)
> at
> org.quicktheories.dsl.TheoryBuilder4.checkAssert(TheoryBuilder4.java:162)
> at
> org.apache.cassandra.transport.frame.checksum.ChecksummingTransformerTest.corruptionCausesFailure(ChecksummingTransformerTest.java:87)
> {code}
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