[jira] [Created] (FLUME-2387) Flume log4j appender stacktrace handling

["Nikolaos Tsipas (JIRA)" <ji...@apache.org>]

Nikolaos Tsipas created FLUME-2387:
--------------------------------------

             Summary: Flume log4j appender stacktrace handling
                 Key: FLUME-2387
                 URL: https://issues.apache.org/jira/browse/FLUME-2387
             Project: Flume
          Issue Type: Bug
          Components: Sinks+Sources
    Affects Versions: v1.4.0
         Environment: centos 6
            Reporter: Nikolaos Tsipas


Hello,

I'm using log4j flume appender in a tomcat webapp to send log lines to a flume avro source. Everything seems to work fine for "normal" log lines however calls like:
{code}
logger.error("Exception: ", e); 
{code}
seem to ignore the stacktrace (throwable) so the only thing I get on the other side is the "Exception: " string. I tried the same code with console and file log4j appenders and the stacktraces are printed properly.

I would appreciate any ideas/suggestion about why I can't get them with the flume log4j appender?

I've noticed that both console and file appenders are extending {{org.apache.log4j.WriterAppender->org.apache.log4j.AppenderSkeleton}} while flume appender extends {{org.apache.log4j.AppenderSkeleton}} only. 

This is my log4j.xml
{code}
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

    <!-- Appenders -->
    <appender name="console" class="org.apache.log4j.ConsoleAppender">
        <param name="Target" value="System.out" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%t %-5p %c{2} - %m%n" />
        </layout>
    </appender>
    
    <appender name="flume"       class="org.apache.flume.clients.log4jappender.Log4jAppender">
             <param name="Hostname" value="localhost"/>
             <param name="Port" value="4545"/>
             <param name="UnsafeMode" value="true"/>
        <layout class="org.apache.log4j.PatternLayout">
          <param name="ConversionPattern" value="%t %-5p %c{2} - %m%n"/>
        </layout>
    </appender>
    
    <appender name="file" class="org.apache.log4j.FileAppender">
        <param name="File" value="/tmp/util.log" />
        <param name="Append" value="true" />
        <layout class="org.apache.log4j.PatternLayout">
          <param name="ConversionPattern" value="%t %-5p %c{2} - %m%n"/>
        </layout>
     </appender>
    

    <!-- Root Logger -->
    <root>
        <priority value ="info" />
        <appender-ref ref="console" />
        <appender-ref ref="flume" />
        <appender-ref ref="file" />
    </root>
    
</log4j:configuration>

{code}

Thank you!
Nick



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