[jira] [Created] (LOG4J2-1561) print expected mdc info to each line of the exception stacktrace

["Zilong Song (JIRA)" <ji...@apache.org>]

Zilong Song created LOG4J2-1561:
-----------------------------------

             Summary: print expected mdc info to each line of the exception stacktrace
                 Key: LOG4J2-1561
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1561
             Project: Log4j 2
          Issue Type: Improvement
          Components: Core
    Affects Versions: 2.6.2
         Environment: OS X EI Caption, Java 1.7
            Reporter: Zilong Song
            Priority: Minor
             Fix For: 2.6.2


In some applications we need to append certain MDC information to each line of logs for a certain process, so that we can easily distinguish them from other logs, and further analysis them. But currently this information cannot be appended to any line of the stack trace, so it's hard to get the lines of the stack trace from massive lines. This issue will append this information to each line of the stack trace. 

An already known usage for this feature is that we can easily get all lines of log for a certain process when we set an ID before the process starts.

The following is the code and configuration, and the effect of it.

code:
{code:java|title=Test.main()}
public static void main(String[] args) {
    final Logger logger = LogManager.getRootLogger();
    ThreadContext.put("proc_id", "1234567890");
    Exception exception = new Exception("sample exception");
    logger.info("an exception is logged", exception);
}
{code}

{code:xml|title=log4j2.xml|}
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" name="live-im">
    <Appenders>
        <Console name="console-log" target="SYSTEM_OUT">
            <PatternLayout pattern="%d %p [%t] %C{2} (%F:%L) - %m %X{proc_id}%n%cEx{proc_id}"/>
        </Console>
    </Appenders>
    <Loggers>
        <Root level="all">
            <AppenderRef ref="console-log"/>
        </Root>
    </Loggers>
</Configuration>
{code}

{code:title=output}
2016-09-03 22:56:56,721 INFO [main] pattern.Test (Test.java:17) - an exception is logged 1234567890
java.lang.Exception: sample exception 1234567890
	at org.apache.logging.log4j.core.pattern.Test.main(Test.java:16) [classes/:?] 1234567890
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91] 1234567890
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_91] 1234567890
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_91] 1234567890
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_91] 1234567890
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) [idea_rt.jar:?] 1234567890
{code}



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