Kenneth Knowles created BEAM-10471:
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Summary: 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
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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