hadoop

安装使用

第一步：在apache-flume-1.7.0-bin\conf目录下创建一个example.conf配置文件。然后把官文档中的案例内容复制到example.conf文件中，如下内容：

# example.conf: A single-node Flume configuration

# Name the components on this agent
a1.sources = r1
a1.sinks = k1
a1.channels = c1

# Describe/configure the source
a1.sources.r1.type = netcat
a1.sources.r1.bind = localhost
a1.sources.r1.port = 44444

# Describe the sink
a1.sinks.k1.type = logger

# Use a channel which buffers events in memory
a1.channels.c1.type = memory
a1.channels.c1.capacity = 1000
a1.channels.c1.transactionCapacity = 100

# Bind the source and sink to the channel
a1.sources.r1.channels = c1
a1.sinks.k1.channel = c1

第二步：进入到解压flume目录中执行命令，文档中的执行命令如下：

[root@mini3 apache-flume-1.7.0-bin]# bin/flume-ng agent --conf conf --conf-file conf/example.conf --name a1 -Dflume.root.logger=INFO,console

参数的简要说明：指明conf文件路径、指明conf文件、指定agent、指明log打印信息级别和位置。执行效果：

Info: Including Hive libraries found via () for Hive access
+ exec /usr/local/jdk1.7.0_65/bin/java -Xmx20m -Dflume.root.logger=INFO,console -cp '/usr/local/apache-flume-1.7.0-bin/conf:/usr/local/apache-flume-1.7.0-bin/lib/*:/lib/*' -Djava.library.path= org.apache.flume.node.Application --conf-file example.conf --name a1
......
2018-01-31 18:14:45,870 (lifecycleSupervisor-1-4) [INFO - org.apache.flume.source.NetcatSource.start(NetcatSource.java:155)] Source starting
2018-01-31 18:14:45,894 (lifecycleSupervisor-1-4) [INFO - org.apache.flume.source.NetcatSource.start(NetcatSource.java:169)] Created serverSocket:sun.nio.ch.ServerSocketChannelImpl[/127.0.0.1:44444]

如上打印日志，启动成功。

第三步：通过telnet客户端进行测试。另开一个终端命令行：输入命令

telnet localhost 44444

连接成功后即可进行模拟通信，即经过44444端口发送消息，让flume监听到。执行结果如下：

flume后台监听打印：

2018-01-31 18:15:48,913 (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.flume.sink.LoggerSink.process(LoggerSink.java:95)] Event: { headers:{} body: 6E 69 68 61 6F 0D                               nihao. }

注：如果不能使用telnet，通过yum安装即可。