Flume primer

  flume

download

Fromhttp://flume.apache.org/download.htmlDownload binary version

Installation

tar zvxf apache-flume-1.6.0-bin.tar.gz

directory structure

  • Bin-contains startup scripts

  • Conf-Contains Profile Templates

  • Docs-include documents

  • Lib-dependent jar package

  • Tools-Implementation with log4j appender

Configuration file structure

1) Main structure

图片描述

2) Top layer

<agent-name>.sources=<source> <source>
<agent-name>.channels=<channel> <channel>
<agent-name>.sinks=<sink> <sink>

3) bottom layer

<agent-name>.<component-type>.<component-name>.<configuration-parameter>=<value>

4) instance single-node-demo.properties

a1.sources=src1
a1.sinks=sink1
a1.channels=ch1

# Configure the source
a1.sources.src1.type=netcat
a1.sources.src1.bind=localhost
a1.sources.src1.port=51000

# Sink Configuration
a1.sinks.sink1.type=logger

# Channel configuration
a1.channels.ch1.type=memory
a1.channels.ch1.capacity=1000
a1.channels.ch1.transactionCapacity=100

# Link stuff together
a1.sources.src1.channels=ch1
a1.sinks.sink1.channel=ch1

Start agent

$bin/flume-ng agent 
--conf-file conf/single-node-demo.properties 
--name a1 
--conf ./conf/ 
-Dflume.root.logger=INFO,console

It can also be abbreviated as

bin/flume-ng agent 
-c conf/single-node-demo.properties 
-n a1 
-f ./conf/ 
-Dflume.root.logger=INFO,console

  • -c is equivalent to –conf-file

  • -f is equivalent to –conf

  • -n is equivalent to –name.

Netcat sends a message

nc localhost 51000
hello
OK
world
OK

Look at flume’s output

2016-01-12 22:11:20,603 (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.flume.sink.LoggerSink.process(LoggerSink.java:94)] Event: { headers:{} body: 68 65 6C 6C 6F                                  hello }
2016-01-12 22:11:20,603 (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.flume.sink.LoggerSink.process(LoggerSink.java:94)] Event: { headers:{} body: 77 6F 72 6C 64                                  world }