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https://issues.apache.org/jira/browse/BEAM-10471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17159078#comment-17159078
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Etienne Chauchot edited comment on BEAM-10471 at 7/16/20, 9:54 AM:
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Hi Kenn, Thanks for raising this. To be honest 10% range for the assertion was
quite random guess. As it is a minor change I could do it quickly myself
changing the percentage and the assertion method.
was (Author: echauchot):
Hi Kenn, Thanks for raising this. To be honest 10% range for the asserting was
quite random guess. As it is a minor change I could do it quickly myself
changing the percentage and the assertion method.
> Failure / flake in CassandraIOTest > testEstimatedSizeBytes
> -----------------------------------------------------------
>
> Key: BEAM-10471
> URL: https://issues.apache.org/jira/browse/BEAM-10471
> Project: Beam
> Issue Type: Bug
> Components: io-java-cassandra
> Reporter: Kenneth Knowles
> Priority: P1
> Labels: flake
>
> https://ci-beam.apache.org/job/beam_PreCommit_Java_Commit/12328/testReport/junit/org.apache.beam.sdk.io.cassandra/CassandraIOTest/testEstimatedSizeBytes/
> {{AssertionError}} with no error message. Please give a meaningful error
> message. Preferably do not use {{assertTrue}} and other less meaningful
> asserters.
> Digging into the code, it is a bounds check that the estimated bytes are +/-
> 10% of expected, since the result is nondeterministic. It fell outside of the
> range but since the assertion is written as {{assertTrue}} we do not see the
> actual value.
> https://github.com/apache/beam/blob/66bcc9a967746cad12dfdeed473fb60c77033514/sdks/java/io/cassandra/src/test/java/org/apache/beam/sdk/io/cassandra/CassandraIOTest.java#L291
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