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https://issues.apache.org/jira/browse/KYLIN-4859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17259341#comment-17259341
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ASF GitHub Bot commented on KYLIN-4859:
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hit-lacus merged pull request #1537:
URL: https://github.com/apache/kylin/pull/1537
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> Log4J reinitialized/reconfigured by Spark Logging
> -------------------------------------------------
>
> Key: KYLIN-4859
> URL: https://issues.apache.org/jira/browse/KYLIN-4859
> Project: Kylin
> Issue Type: Improvement
> Components: Others
> Affects Versions: v4.0.0-alpha
> Reporter: ShengJun Zheng
> Priority: Minor
>
> Spark Logging was intrucoded in kylin 4.0-alpha, it uses SL4J too, but it
> will reinitialize log4j when RootLoggers's Appender is empty.
> See:
> https://github.com/apache/spark/blob/45e19bb99acd5066723fec2bbdc0c99c696c3daf/core/src/main/scala/org/apache/spark/internal/Logging.scala#L120
> this causes some logs of a query logged in file(kylin.log), the other logged
> in stdout(kylin.out) using configuration file log4j-defaults.properties in
> spark-core_2.11-2.x.x.jar
> not firendly to read and anlyze a query performance, and may cause other
> logging confusions
> To Avoid this is, default appenders for rootLoggers should be set in
> kylin-server-log4j.properties
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