Niklas Semmler created FLINK-26710:
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Summary: TestLoggerResource hides log lines
Key: FLINK-26710
URL: https://issues.apache.org/jira/browse/FLINK-26710
Project: Flink
Issue Type: Bug
Components: Test Infrastructure
Affects Versions: 1.15.0
Reporter: Niklas Semmler
{{org.apache.flink.testutils.logging.TestLoggerResource}} makes log lines
accessible to tests. It extends {{org.junit.rules.ExternalResource}} and thus
can be used as a rule. Example for its use can be found
[here|https://github.com/apache/flink/blob/c6997c97c575d334679915c328792b8a3067cfb5/flink-runtime/src/test/java/org/apache/flink/runtime/jobmanager/JobManagerProcessUtilsTest.java#L145].
Unfortunately, the current implementation consumes *all* log lines of a
{{Logger}} in such a way that they are not forwarded to the general log output.
As such, someone debugging a test will not have access to log lines and this
can complicate debugging. The implementation needs to be changed to
non-exclusively consume log lines.
In a first attempt, we enabled the {{additivity}} of the {{Logger}} created by
{{TestLoggerResource}}. This works only for the case were both the {{Logger}}
created by {{TestLoggerResource}} and the parent {{Logger}} use the same log
level. When they use different log levels, the {{TestLoggerResource}}
{{Logger}} overwrites the log level.
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