Quanlong Huang created IMPALA-13345:
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             Summary: Log the package/class name when changing FE log levels
                 Key: IMPALA-13345
                 URL: https://issues.apache.org/jira/browse/IMPALA-13345
             Project: IMPALA
          Issue Type: Task
          Components: Backend
            Reporter: Quanlong Huang


In the /log_level page of WebUI, we can change the log level of Frontend and 
Backend without restarting the process. For the FE part, a package/class name 
is specified as the target. However, the name is not logged:
{code:java}
I0903 09:15:50.923060  8414 logging-support.cc:181] New Java log level set: 
TRACE{code}
There are no ways to track what have been done on the WebUI. It'd be helpful to 
log the package/class name of the request. Code:
[https://github.com/apache/impala/blob/53a452af669b022fd2ab19eb58a5dc5ea29aed78/be/src/util/logging-support.cc#L181]



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