flume笔记

flume 安装后基本的测试验证：

配置

source 使用 necat 类型,sink 采用 file_roll 类型, 从监听端口获取数据，保存到本地文件。 拷贝配置模板：

cp conf/flume-conf.properties.template conf/flume-conf.properties

编辑配置如下：

# The configuration file needs to define the sources,

# the channels and the sinks.

# Sources, channels and sinks are defined per agent,

# in this case called 'agent'

agent.sources = r1

agent.channels = c1

agent.sinks = s1

# For each one of the sources, the type is defined

agent.sources.r1.type = netcat

agent.sources.r1.bind = localhost

agent.sources.r1.port = 8888

# The channel can be defined as follows.

agent.sources.r1.channels = c1

# Each sink's type must be defined

agent.sinks.s1.type = file_roll

agent.sinks.s1.sink.directory = /tmp/log/flume

#Specify the channel the sink should use

agent.sinks.s1.channel = c1

# Each channel's type is defined.

agent.channels.c1.type = memory

# Other config values specific to each type of channel(sink or source)

# can be defined as well

# In this case, it specifies the capacity of the memory channel

agent.channels.c1.capacity = 100

功能验证

1.建立输出目录

mkdir -p /tmp/log/flume

2.启动服务

bin/flume-ng agent --conf conf -f conf/flume-conf.properties -n agent&

运行日志位于logs目录，或者启动时添加-Dflume.root.logger=INFO,console 选项前台启动，输出打印日志，查看具体运行日志，服务异常时查原因。

3.发送数据

telnet localhost 8888

输入

helloworld!hello Flume!

4.查看数据文件 查看 /tmp/log/flume 目录文件:

# 文件名不同，需要根据实际情况修改和查看

cat /tmp/log/flume/1447671188760-2

hello world!hello Flume!

在修改配置后，一定要重启flume，否则配置无效。启动flume之后，与端口进行了绑定。再通过telnet向指定端口发送数据。假如，首先发送数据，然后配置重启flume，会报异常 org.apache.flume.FlumeException: java.net.BindException: Address already in use。

原因解析：如果首先发送数据，则发送端与该端口建立起了一个socket连接。当此时使用flume的netcat监听端口获取数据，则无法实现端口绑定。

虽然会一直报异常，但是对应的文件仍然会以一定的时间间隔生成或者文本大小生成。