[jira] [Created] (FLINK-20735) Support configurable log level

[Shang Yuanchun (Jira)]

zlzhang0122 created FLINK-20735:
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             Summary: Support configurable log level
                 Key: FLINK-20735
                 URL: https://issues.apache.org/jira/browse/FLINK-20735
             Project: Flink
          Issue Type: Improvement
    Affects Versions: 1.12.0
            Reporter: zlzhang0122
             Fix For: 1.13.0


Now the default log level of flink is "INFO" and if we want to change the default log level, we have to change that in many log file and this may affect all the jobs using these config, I think we can expose a log level config for users to change the default log level for every single job.And if users don't provide the config value, the default log level won't be changed. 



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