Logging

[ballsuen]

In my project, services will be shared among online transactions and batches.

I want the logs written by the same logging statement in a service to be separated to two different log files for online and batch. How can that be done?

[Marten Deinum]

This really hasn't anything to do with the Spring Batch project.

The answer is related to your logging framework. In Log4j and Logback you have something called a MDC, there you can set (per thread/per...) some settings which also get printed in the logfile. logback (http://logback.qos.ch/manual/mdc.html)

[ballsuen]

When the logs are being written by multi-thread processes during batch, is it possible that it would cause contention. Or log4j has its own mechanism to address that?

[Alarmnummer]

You could have a look at the following:

http://logging.apache.org/log4j/docs/api/org/apache/log4j/AsyncAppender.html

[ballsuen]

Is AsyncAppender a singleton thread inside the system?

Will it queue the logging events internally such that no concurrent logging will occur to the same log file in the same moment?

[dejanp]

Imo - high (high meaning hundreds of thousands of messages per day) throughput/ high concurrency systems shouldn't use detailed levels of logging. If you need audit for all the messages you shouldn't rely on logging.