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From: "Robbie Strickland (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (LOG4J2-240) Recursive call to appender error
 using Flume appender
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    [ https://issues.apache.org/jira/browse/LOG4J2-240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650889#comment-13650889 ] 

Robbie Strickland commented on LOG4J2-240:
------------------------------------------

This turned out (not surprisingly) to be a flume configuration issue on the affected nodes. The Flume agents on those nodes were not starting properly, and this resulted in the fairly cryptic recursion error.
                
> Recursive call to appender error using Flume appender
> -----------------------------------------------------
>
>                 Key: LOG4J2-240
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-240
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Appenders
>    Affects Versions: 2.0-beta5
>         Environment: Ubuntu 12
>            Reporter: Robbie Strickland
>              Labels: flume
>
> I am using Log4j2 with the Flume appender with the following configuration:
> <?xml version="1.0" encoding="UTF-8"?>
> <configuration status="debug" name="ALI" packages="">
>   <appenders>
>     <Flume name="eventLogger" suppressExceptions="false" compress="false">
>       <Agent host="localhost" port="4141"/>
>       <RFC5424Layout enterpriseNumber="18060" includeMDC="true" appName="com.weather.ali"/>
>     </Flume>
>     <RollingFile name="VTECs" fileName="logs/vtecs.log"
>                  filePattern="logs/$${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log.gz">
>       <PatternLayout>
>         <pattern>[%d{ISO8601}] %m%n</pattern>
>       </PatternLayout>
>       <Policies>
>         <TimeBasedTriggeringPolicy />
>         <SizeBasedTriggeringPolicy size="250 MB"/>
>       </Policies>
>     </RollingFile>
>   </appenders>
>   <loggers>
>     <root level="debug">
>       <appender-ref ref="eventLogger"/>
>     </root>
>     <logger name="VTEC" level="debug">
>       <appender-ref ref="VTECs"/>
>     </logger>
>   </loggers>
> </configuration>
> This works as expected on a couple nodes, but the remaining nodes produce the following error:
> ERROR Recursive call to appender eventLogger
> Here is the full output of the Log4j bootstrap:
> 2013-05-07 09:21:59,033 DEBUG Calling createAgent on class org.apache.logging.log4j.flume.appender.Agent for element Agent with params(host="localhost", port="4141")
> 2013-05-07 09:21:59,040 DEBUG Calling createLayout on class org.apache.logging.log4j.core.layout.RFC5424Layout for element RFC5424Layout with params(facility="null", id="null", enterpriseNumber="18060", includeMDC="true", mdcId="null", mdcPrefix="null", eventPrefix="null", newLine="null", newLineEscape="null", appName="com.weather.ali", messageId="null", mdcExcludes="null", mdcIncludes="null", mdcRequired="null", charset="null", exceptionPattern="null", Configuration(MyApp))
> 2013-05-07 09:22:02,148 DEBUG Generated plugins in 3.106963125 seconds
> 2013-05-07 09:22:02,156 DEBUG Calling createAppender on class org.apache.logging.log4j.flume.appender.FlumeAppender for element Flume with params(agents={host=localhost port=4141}, properties={}, embedded="null", type="null", dataDir="null", connectTimeout="null", requestTimeout="null", agentRetries="null", maxDelay="null", name="eventLogger", suppressExceptions="false", mdcExcludes="null", mdcIncludes="null", mdcRequired="null", mdcPrefix="null", eventPrefix="null", compress="false", batchSize="null", null, RFC5424Layout(facility=LOCAL0 appName=com.weather.ali defaultId=Audit enterpriseNumber=18060 newLine=false includeMDC=true messageId=null), null)
> 2013-05-07 09:22:02,159 DEBUG Starting FlumeAvroManager FlumeAvro[localhost:4141]
> 2013-05-07 09:22:02,552 DEBUG Calling createAppenders on class org.apache.logging.log4j.core.config.plugins.AppendersPlugin for element appenders with params(appenders={eventLogger})
> 2013-05-07 09:22:06,774 DEBUG Generated plugins in 4.221008626 seconds
> 2013-05-07 09:22:06,776 DEBUG Calling createAppenderRef on class org.apache.logging.log4j.core.config.AppenderRef for element appender-ref with params(ref="eventLogger", level="null", null)
> 2013-05-07 09:22:06,778 DEBUG Calling createLogger on class org.apache.logging.log4j.core.config.LoggerConfig$RootLogger for element root with params(additivity="null", level="debug", includeLocation="null", appender-ref={org.apache.logging.log4j.core.config.AppenderRef@55ed34f1}, properties={}, Configuration(MyApp), null)
> 2013-05-07 09:22:06,779 DEBUG Calling createLoggers on class org.apache.logging.log4j.core.config.plugins.LoggersPlugin for element loggers with params(loggers={root})
> 2013-05-07 09:22:06,779 DEBUG Shutting down OutputStreamManager SYSTEM_OUT
> 2013-05-07 09:22:06,779 DEBUG Reconfiguration completed
> 2013-05-07 09:22:07,237 ERROR Recursive call to appender eventLogger
> Why would this work on some nodes and not on others? I have looked at the code where this error is generated, and it appears to get called whenever the appender code gets called more than once. I see no reason why this should happen.

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