log4j Asynchronous log message order

[Ronnie Phelps]

When using log4j to asynchronously log messages to a local log file, will the order of the log messages be preserved? (i.e. earliest time stamp will always be first and latest will be last)

[Paul Clapham]

I expect that would depend on how you implemented it. Do you have a specific implementation of asynchronous logging you wanted to ask about?

[Ronnie Phelps]

a simple implementation using the following xml to log to the console........

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" > <log4j:configuration> <appender name="stdout" class="org.apache.log4j.ConsoleAppender"> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy/MM/dd HH:mm:ss,SSS} [%t] %-5p %c %x - %m%n"/> </layout> </appender> <appender name="ASYNC" class="org.apache.log4j.AsyncAppender"> <param name="BufferSize" value="500"/> <appender-ref ref="stdout"/> </appender> <root> <priority value="error"></priority> <appender-ref ref="ASYNC"/> </root> </log4j:configuration>

[Paul Clapham]

Well, the documentation doesn't specify the answer to your question. There's mention of a "buffer" which to me sounds like an orderly queue of messages, but if that isn't enough then you could examine the source code.