[jira] [Created] (IMPALA-9541) Document for dynamic log level changes

["Quanlong Huang (Jira)" <ji...@apache.org>]

Quanlong Huang created IMPALA-9541:
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             Summary: Document for dynamic log level changes
                 Key: IMPALA-9541
                 URL: https://issues.apache.org/jira/browse/IMPALA-9541
             Project: IMPALA
          Issue Type: Documentation
          Components: Docs
            Reporter: Quanlong Huang
         Attachments: log_level_full.png

There is a /log_level tab in the debug page of all Impala servers. We can use it to dynamically adjust log levels without restarting the server. Although it's a feature implemented years ago (IMPALA-4822), there are no documents about it. I think we should add a section in https://impala.apache.org/docs/build/html/topics/impala_logging.html about it. Also it's good to explain the pattern of each line in logs.

For FE debugging, I usually set log level of org.apache.impala to TRACE.
For log pattern, it's 
${level}${month}${day} HH:MM:SS.${us} ${thread-id} ${source-file}:${line}] ${query-id}] ${message}



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