Sorry, yes I was going to mention that I added this support as noted by Sean.
However, it only works when the configuration in in properties format.
Flume is currently packaged with an XML configuration, probably because I hate
the properties format. But as Sean notes, this could be resolved by converting
log4j2.xml to log4j2.properties and making sure to include the system property
reference.
Ralph
> On Jun 14, 2022, at 9:59 AM, Sean Busbey <sbus...@apple.com.INVALID> wrote:
>
> Log4j 2.17.2 added the needed building blocks via LOG4J2-3341 at the request
> of the Hadoop and HBase projects.
>
> For example, the out of the box HBase log4j2.properties file includes several
> references to system properties, including this for the root logger:
>
> ```
> rootLogger = ${sys:hbase.root.logger:-INFO,console}
> ```
>
> And then our out of the box bootstrapping scripts include setting the
> parameter based on an environment variable:
>
> ```
> HBASE_OPTS="$HBASE_OPTS
> -Dhbase.root.logger=${HBASE_ROOT_LOGGER:-INFO,console}"
> ```
>
> We could implement something similar to allow setting a system property to
> change the root logger.
>
>> On Jun 13, 2022, at 4:33 PM, Tristan Stevens <tris...@apache.org> wrote:
>>
>> Hi Ralph,
>> That's the one that I had trouble with. Is there an equivalent system
>> parameter that you can set to get the same behaviour with log4j2?
>>
>> Tristan
>>
>> Get Outlook for Android<https://aka.ms/AAb9ysg>
>>
>> ________________________________
>> From: Ralph Goers <ralph.go...@dslextreme.com>
>> Sent: Monday, 13 June 2022, 22:04
>> To: dev@flume.apache.org <dev@flume.apache.org>
>> Subject: Log4j & user doc
>>
>> Tristan,
>>
>> Although I see references to -Dflume.root.logger I see no place that
>> actually implements support for it. So I removed those from the
>> documentation.
>>
>> There are still references to Log4j 1 but those are all for Flume’s Log4j
>> Appender, which still targets Log4j 1.
>>
>> Please review the Flume web site for any other issues there.
>>
>> Ralph
>>
>
>
