what/why cluster.xml?

[Joaquin Menchaca]

I was wondering what this is used for and why popular sample configs, like
viki, wurstmeister, ptgoetz use it?  I did look through docs, didn't find
it.

Example:

<?xml version="1.0" encoding="UTF-8"?>

<configuration scan="true" scanPeriod="60 seconds">
 <appender name="A1"
class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>/var/log/storm/${logfile.name}</file>
    <rollingPolicy
class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
      <fileNamePattern>/var/log/storm/${logfile.name}.%i</fileNamePattern>
      <minIndex>1</minIndex>
      <maxIndex>9</maxIndex>
    </rollingPolicy>

    <triggeringPolicy
class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
      <maxFileSize>100MB</maxFileSize>
    </triggeringPolicy>

    <encoder>
      <pattern>%d{yyyy-MM-dd HH:mm:ss} %c{1} [%p] %m%n</pattern>
    </encoder>
 </appender>

 <appender name="ACCESS"
class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>/var/log/storm/access.log</file>
    <rollingPolicy
class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
      <fileNamePattern>/var/log/storm/access.log.%i</fileNamePattern>
      <minIndex>1</minIndex>
      <maxIndex>9</maxIndex>
    </rollingPolicy>

    <triggeringPolicy
class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
      <maxFileSize>100MB</maxFileSize>
    </triggeringPolicy>

    <encoder>
      <pattern>%d{yyyy-MM-dd HH:mm:ss} %c{1} [%p] %m%n</pattern>
    </encoder>
  </appender>

  <appender name="METRICS"
class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>/var/log/storm/metrics.log</file>
    <rollingPolicy
class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
      <fileNamePattern>metrics.log.%i</fileNamePattern>
      <minIndex>1</minIndex>
      <maxIndex>9</maxIndex>
    </rollingPolicy>

    <triggeringPolicy
class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
      <maxFileSize>2MB</maxFileSize>
    </triggeringPolicy>

    <encoder>
      <pattern>%d %-8r %m%n</pattern>
    </encoder>
  </appender>

  <root level="INFO">
    <appender-ref ref="A1"/>
  </root>

  <logger name="backtype.storm.messaging.netty">
    <level value="WARN" />
    <appender-ref ref="A1" />
  </logger>

  <logger name="backtype.storm">
    <level value="DEBUG" />
    <appender-ref ref="A1" />
  </logger>

  <logger name="backtype.storm.security.auth.authorizer" additivity="false">
    <level value="INFO" />
    <appender-ref ref="ACCESS" />
  </logger>

  <logger name="backtype.storm.metric.LoggingMetricsConsumer"
additivity="false" >
    <level value="INFO"/>
    <appender-ref ref="METRICS"/>
  </logger>

</configuration>


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