flume log4j配置

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1、依赖jar包导入，通过maven管理，pom文件增加如下配置：

<!-- log4j输出日志到flume的appender依赖包 -->
<dependency>
    <groupId>org.apache.flume.flume-ng-clients</groupId>
    <artifactId>flume-ng-log4jappender</artifactId>
    <version>1.6.0</version>
</dependency>

<!-- log4j 依赖包-->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.5</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.5</version>
</dependency>

  2、log4j配置文件：

2.1 log4j.properties文件配置：

#log4j输出到flume单机模式配置
log4j.appender.loadbalance = org.apache.flume.clients.log4jappender.Log4jAppender
log4j.appender.loadbalance.hostname = hadoop011
log4j.appender.loadbalance.port = 6666

#log4j输出到flume负载均衡方式配置
log4j.appender.loadbalance = org.apache.flume.clients.log4jappender.LoadBalancingLog4jAppender
log4j.appender.loadbalance.Hosts = hadoop011:6666 hadoop012:6666
#log4j.appender.loadbalance.UnsafeMode = true
log4j.appender.out2.MaxBackoff = 30000
#FQDN RANDOM ,default is ROUND_ROBIN
log4j.appender.loadbalance.Selector = RANDOM
log4j.appender.loadbalance.layout=org.apache.log4j.PatternLayout
log4j.appender.loadbalance.layout.ConversionPattern=%m

2.2 XMl方式配置：

<!-- 单机模式 -->
<appender name="FLUME"
    class="org.apache.flume.clients.log4jappender.Log4jAppender">
    <!-- 定义控制台日志级别入口 -->
    <param name="Hostname" value="192.168.12.11" />
    <param name="Port" value="6666" />
    <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern"
            value="%d{yyyy-MM-dd hh:mm:ss,SSS} [%p][%t] %-20.30c{1} %4L %m%n" />
    </layout>
</appender>
<!-- 负载均衡方式 -->
<appender name="FLUME"
    class="org.apache.flume.clients.log4jappender.LoadBalancingLog4jAppender">
    <!-- 定义控制台日志级别入口 -->
    <param name="hosts" value="192.168.12.11:6666 192.168.12.12:6666" />
    <param name="Selector" value="RANDOM" />
    <param name="maxBackoff" value="30000" />
    <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern"
            value="%d{yyyy-MM-dd hh:mm:ss,SSS} [%p][%t] %-20.30c{1} %4L %m%n" />
    </layout>
</appender>

      注：以上配置中ip地址均可以使用hostname或域名替代。