[jira] [Created] (LOG4J2-1465) Default layouts for various appenders could be more consistent

["Mikael Ståldal (JIRA)" <ji...@apache.org>]

Mikael Ståldal created LOG4J2-1465:
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             Summary: Default layouts for various appenders could be more consistent
                 Key: LOG4J2-1465
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1465
             Project: Log4j 2
          Issue Type: Improvement
          Components: Appenders
    Affects Versions: 2.6.2
            Reporter: Mikael Ståldal


The appenders with layout support have different layouts as default. This could be improved, made more consistent and better documented:

According to documentation:

* ConsoleAppender - pattern %m%n
* FileAppender - no default
* FlumeAppender - RFC5424Layout
* JMSAppender - SerializedLayout
* KafkaAppender - formatted message
* MemoryMappedFileAppender - no default
* RandomAccessFileAppender - no default
* RollingFileAppender - no default
* RollingRandomAccessFileAppender - no default
* SMTPAppender - SerializedLayout
* SocketAppender - SerializedLayout
* JeroMQAppender - _If you do not specify a layout, the appender uses the default pattern appender returned by PatternLayout.createDefaultLayout()_

This is not accurate though, e.g. FileAppender (and its variants) have pattern %m%n as default.

First we should update the documentation to match the implementation. But maybe we should also consider changing some of the defaults.

I think that pattern %m%n make sense as default for Console and the various File appenders.

I assume that RFC5424 make sense as default for Flume, but I don't know about Flume.

I don't think that pattern %m%n make sense as default for JeroMQ. And it was probably a mistake (by me) to make formatted message as default for Kafka.

And as highlighted by https://issues.apache.org/jira/browse/LOG4J2-1226 it's not good to have SerializedLayout as default for any appender.

I suggest that the "generic binary" appenders JMSAppender, KafkaAppender, SocketAppender and JeroMQAppender have no default layout, make it mandatory to specify a layout for them. That will force the user to make a conscious choice of layout, which I think is good.

SMTPAppender should probably have pattern %m%n as default just like Console and File.



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