flink-runtime/src/test/resources/logback-test.xml

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<configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] [%X{sourceThread} - %X{akkaSource}] %-5level %logger{60} - %msg%n</pattern>
        </encoder>
    </appender>

    <root level="WARN">
        <appender-ref ref="STDOUT"/>
    </root>

    <!-- The following loggers are disabled during tests, because many tests deliberately
         throw error to test failing scenarios. Logging those would overflow the log. -->
         <!---->
    <logger name="org.apache.flink.runtime.operators.DataSinkTask" level="OFF"/>
    <logger name="org.apache.flink.runtime.operators.BatchTask" level="OFF"/>
    <logger name="org.apache.flink.runtime.client.JobClient" level="OFF"/>
    <logger name="org.apache.flink.runtime.taskmanager.Task" level="OFF"/>
    <logger name="org.apache.flink.runtime.jobmanager.JobManager" level="OFF"/>
    <logger name="org.apache.flink.runtime.testingUtils" level="OFF"/>
    <logger name="org.apache.flink.runtime.executiongraph.ExecutionGraph" level="OFF"/>
    <logger name="org.apache.flink.runtime.jobmanager.EventCollector" level="OFF"/>
    <logger name="org.apache.flink.runtime.instance.InstanceManager" level="OFF"/>
</configuration>