[HBASE-26802] Backport the log4j2 changes to branch-2 - ASF JIRA

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Use log4j2 instead of log4j for logging.
Exclude log4j dependency from hbase and transitive dependencies, use log4j-1.2-api as test dependency for bridging as hadoop still need log4j for some reasons. Copy FileAppender implementation in hbase-logging as the ContainerLogAppender for YARN NodeManager extends it. All log4j.properties files have been replaced by log4j2.properties.

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Use log4j2 instead of log4j for logging. Exclude log4j dependency from hbase and transitive dependencies, use log4j-1.2-api as test dependency for bridging as hadoop still need log4j for some reasons. Copy FileAppender implementation in hbase-logging as the ContainerLogAppender for YARN NodeManager extends it. All log4j.properties files have been replaced by log4j2.properties.

One thing is that, we'd better make sure that users can still use the old log4j.properties for logging.

breaks

HBASE-26871 shaded mapreduce and shaded byo-hadoop client artifacts contains no classes

is related to

HBASE-19577 Use log4j2 instead of log4j for logging

HBASE-26723 Switch to use log4j2.properties file to configure log4j2

relates to

HBASE-26854 Shell startup logs a bunch of noise

links to

GitHub Pull Request #4166