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https://issues.apache.org/jira/browse/HIVE-13027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15151212#comment-15151212
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Prasanth Jayachandran commented on HIVE-13027:
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The automatic log4j2 configurator will look for file specified via
-Dlog4j.configurationFile.. if this file could not be located in classpath then
it will default to ERROR,console.
Programmatic initialization of logging happens in CliDriver and when running
metastore as a service. Programmatic initialization looks for
hive-log4j2.properties. mr/ExecDriver which initializes the logging for child
JVM uses hive-exec-log4j2.properties. I suspect initialization using
hive-exec-log4j2.properties as it is mr only code path.
> Async loggers for LLAP
> ----------------------
>
> Key: HIVE-13027
> URL: https://issues.apache.org/jira/browse/HIVE-13027
> Project: Hive
> Issue Type: Improvement
> Components: Logging
> Affects Versions: 2.1.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Attachments: HIVE-13027.1.patch
>
>
> LOG4j2's async logger claims to have 6-68 times better performance than
> synchronous logger. https://logging.apache.org/log4j/2.x/manual/async.html
> We should use that for LLAP.
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