[FLINK-24510] Fix the duplicate log output of libraries/connectors，when logback is used - ASF JIRA

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Details

Type: Bug
Status: Open
Priority: Not a Priority
Resolution: Unresolved
Affects Version/s: 1.14.0
Fix Version/s: None
Component/s: Deployment / Scripts
Labels:

Description

When logback is used, the logs of libraries / connectors are output repeatedly.

By default, appenders are cumulative: a logger will log to the appenders attached to itself (if any) as well as all the appenders attached to its ancestors. Thus, attaching the same appender to multiple loggers will cause logging output to be duplicated.

http://logback.qos.ch/manual/configuration.html#cumulative

We can solve this problem in the following ways：

<!-- The following lines keep the log level of common libraries/connectors on
     log level INFO. The root logger does not override this. You have to manually
     change the log levels here. -->
<logger name="akka" level="INFO"/>
<logger name="org.apache.kafka" level="INFO"/>
<logger name="org.apache.hadoop" level="INFO"/>
<logger name="org.apache.zookeeper" level="INFO"/>

<!-- Suppress the irrelevant (wrong) warnings from the Netty channel handler -->
<logger name="org.jboss.netty.channel.DefaultChannelPipeline" level="ERROR"/>