LvDongrong created SPARK-21775:
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             Summary: Dynamic Log Level Settings for executors
                 Key: SPARK-21775
                 URL: https://issues.apache.org/jira/browse/SPARK-21775
             Project: Spark
          Issue Type: New Feature
          Components: Spark Core, Web UI
    Affects Versions: 2.2.0
            Reporter: LvDongrong


Someimes we want to change the log level of executor when our application has 
already deployed, to see detail infomation or decrease the log items. Changing 
the log4j configure file is not convenient,so We add the ability to set log 
level settings for a running executor. It can also reverts the log level back 
to what it was before you added the setting.



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