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https://issues.apache.org/jira/browse/FLUME-2387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13999713#comment-13999713
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Nikolaos Tsipas commented on FLUME-2387:
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It looks like this is controlled by the log4j layout used and what
ignoresThrowable() returns.
> 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
> Labels: appender, log4j, log4jappender, stacktrace
>
> 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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