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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