Flume-0.9.4分布式安装与配置手册
From:http://www.iteblog.com/archives/911个人在运行过程中遇到的问题解决方案是：
As people in cloudera mail list suggest, there are probable reasons of this error:
[*]The HDFS safemode is turned on. Try to run hadoop fs -safemode leave and see if the error goes away.
[*]Flume and Hadoop versions are mismatched. To check this replace the hadoop-core.jar in flume/lib directory with the one found in hadoop's installation folder.
Flume是一个分布式、可靠、和高可用的海量日志采集、聚合和传输的系统。支持在日志系统中定制各类数据发送方，用于收集数据;同时，Flume提供对数据进行简单处理，并写到各种数据接受方(比如文本、HDFS、Hbase等)的能力。
Flume主要有以下几类组件：
（1）、Master: 负责配置及通信管理，是集群的控制器，并支持多master节点；
（2）、Agent: 采集数据，Agent是flume中产生数据流的地方，同时Agent会将产生的数据流传输到Collector；
（3）、Collector: 用于对数据进行聚合（数据收集器），往往会产生一个更大的数据流，然后加载到storage（存储）中 。
简单地来说，就是Agent把采集到的数据定时发送给Collector，Collector接收Agent发送的数据并把数据写到指定的位置(比如文本、HDFS、Hbase等)。
这篇文章主要简单介绍如何部署Flume-0.9.4分布式环境，涉及到三台机器。它们的hostname分别为master,agent,collector。
1、到官网下载Flume-0.9.4，并解压：
1$ wget https://repository.cloudera.com/content/ \2 repositories/releases/com/cloudera/flume-distribution/0.9.4-cdh4.0.0/ \3 flume-distribution-0.9.4-cdh4.0.0-bin.tar.gz \4$tar -zxvf flume-distribution-0.9.4-cdh4.0.0-bin.tar.gz5$ cd flume-0.9.4-cdh3u36$ 2、进入$FLUME_HOMNE/bin目录，将flume-env.sh.template重命名为flume-env.sh，并在flume-env.sh文件里面设置如下变量：
1$ cd bin2$ cp flume-env.sh.template flume-env.sh3$ vim flume-env.sh4 5export FLUME_HOME=/home/q/flume-0.9.4-cdh3u36export FLUME_CONF_DIR=$FLUME_HOME/conf7export PATH=$PATH:$FLUME_HOME/bin8export JAVA_HOME=/usr/lib/jvm/java-6-sun 3、进入$FLUME_HOMNE/conf目录，将flume-site.xml.template重命名为flume-site.xml，并修改flume-site.xml配置文件
查看源代码打印帮助01$ cd ../conf02$ cp flume-site.xml.template flume-site.xml03$ vim flume-site.xml04<property>05 <name>flume.master.servers</name>06 <value>master</value>07 <description>This is the addressforthe config servers status08 server (http)09 </description>10</property>11 12<property>13 <name>flume.collector.output.format</name>14 <value>raw</value>15 <description>The output formatforthe data written by a Flume16 collector node.There are several formats available:17 syslog - outputs events in a syslog-like format18 log4j - outputs events in a pattern similar to Hadoop's log4j pattern19 raw - Event body only.This is most similar to copying a file but20 does not preserve any uniqifying metadata like host/timestamp/nanos.21 avro - Avro Native file format.Default currently is uncompressed.22 avrojson -thisoutputs data as json encoded by avro23 avrodata -thisoutputs data as a avro binary encoded data24 debug - used onlyfordebugging25 </description>26</property>27 28 <property>29 <name>flume.collector.roll.millis</name>30 <value>300000</value>31 <description>The time (in milliseconds)32 between when hdfs files are closed and anewfile is opened33 (rolled).34 </description>35</property>36 37<property>38 <name>flume.agent.logdir.maxage</name>39 <value>10000</value>40 <description> number of milliseconds before a local log file is41 considered closed and ready to forward.42 </description>43</property>44 45<property>46 <name>flume.agent.logdir.retransmit</name>47 <value>60000</value>48 <description>The time (in milliseconds) before a sent event is49 assumed lost and needs to be retried in end-to-end reliability50 mode again.This should be at least 2x the51 flume.collector.roll.millis.52 </description>53</property> 4、将配置好的Flume整个文件夹打包，并发送到agent和collector的机器上：
1$ tar -zcvf flume-0.9.4-cdh3u3.tar.gz flume-0.9.4-cdh3u32$ scp flume-0.9.4-cdh3u3.tar.gz agent:/home/wyp3$ scp flume-0.9.4-cdh3u3.tar.gz collector:/home/wyp 5、分别在agent和collector机器上解压上述包，并在master，agent和collector机器上分别启动以下进程：
1$ $FLUME_HOME/bin/flume master2 3$ $FLUME_HOME/bin/flume node_nowatch –n agent4 5$ $FLUME_HOME/bin/flume node_nowatch –n collector这样master机器就充当master角色；agent 机器充当agent角色；collector机器充当collector角色。
6、打开http://master:35871，看看能否进去，并看到agent和collector进程成功启动，则说明Flume安装完成！
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