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https://issues.apache.org/jira/browse/FLINK-24510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17427428#comment-17427428
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xiangqiao commented on FLINK-24510:
-----------------------------------
I have contributed PR, who can help assign the ticket to me?
thank you.
> Fix the duplicate log output of libraries/connectors，when logback is used
> -------------------------------------------------------------------------
>
> Key: FLINK-24510
> URL: https://issues.apache.org/jira/browse/FLINK-24510
> Project: Flink
> Issue Type: Bug
> Components: Deployment / Scripts
> Affects Versions: 1.14.0
> Reporter: xiangqiao
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2021-10-12-10-52-22-389.png
>
>
> When logback is used, the logs of libraries / connectors are output
> repeatedly.
> !image-2021-10-12-10-52-22-389.png!
>
> 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：
> {code:java}
> <!-- 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"/>
> {code}
>
>
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