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https://issues.apache.org/jira/browse/HADOOP-16206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17332431#comment-17332431
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Duo Zhang commented on HADOOP-16206:
------------------------------------
The converted log4j2.xml has some problems. The biggest problem is that, there
is no direct mapping for the configuration style
'log4j.rootLogger=INFO,console'.
In log4j2, you have to set level and appender separately.
In HBase, we keep the config in hbase-env.sh the same, but in bin/hbase, we
split the property and pass level and appender with difference system
properties, i.e, two '-Dxxx', to the actual java process.
This is an example:
https://github.com/apache/hbase/blob/a4d954e60645f2c81d53c2081d90ea9c175314dc/conf/log4j2.xml#L76
{code}
<Root level="${sys:hbase.root.logger.level:-info}">
<AppenderRef ref="${sys:hbase.root.logger.appender:-console}" />
</Root>
{code}
This is where I split the config:
https://github.com/apache/hbase/blob/a4d954e60645f2c81d53c2081d90ea9c175314dc/bin/hbase#L793
{code}
# log4j2 does not support setting log level and appender at once, so we need to
split HBASE_ROOT_LOGGER
HBASE_ROOT_LOGGER=${HBASE_ROOT_LOGGER:-INFO,console}
array=(${HBASE_ROOT_LOGGER//,/ })
HBASE_OPTS="$HBASE_OPTS -Dhbase.root.logger.level=${array[0]}"
HBASE_OPTS="$HBASE_OPTS -Dhbase.root.logger.appender=${array[1]}"
{code}
In hadoop, we also need to find a way to deal with this.
> Migrate from Log4j1 to Log4j2
> -----------------------------
>
> Key: HADOOP-16206
> URL: https://issues.apache.org/jira/browse/HADOOP-16206
> Project: Hadoop Common
> Issue Type: Sub-task
> Affects Versions: 3.3.0
> Reporter: Akira Ajisaka
> Assignee: Duo Zhang
> Priority: Major
> Attachments: HADOOP-16206-wip.001.patch
>
>
> This sub-task is to remove log4j1 dependency and add log4j2 dependency.
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