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Flume-Replicating Channel Selector 单数据源多出口
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使用 Flume-1 监控文件变动，Flume-1 使用 Replicating Channel Selector 将变动内容传递给 Flume-2，Flume-2 负责存储到 HDFS。同时 Flume-1 将变动内容传递给 Flume-3，Flume-3 负责输出到 Local FileSystem。
一、创建配置文件
1.flume-file-flume.conf
配置 1 个接收日志文件的 source 和两个 channel、两个 sink，分别输送给 flume-flume-hdfs 和 flume-flume-dir。
# Name the components on this agent
a1.sources = r1
a1.sinks = k1 k2
a1.channels = c1 c2 # 将数据流复制给所有 channel
a1.sources.r1.selector.type = replicating # Describe/configure the source
a1.sources.r1.type = exec
a1.sources.r1.command = tail -F /tmp/tomcat.log
a1.sources.r1.shell = /bin/bash -c # Describe the sink
# sink 端的 avro 是一个数据发送者
a1.sinks.k1.type = avro
a1.sinks.k1.hostname = h136
a1.sinks.k1.port = 4141 a1.sinks.k2.type = avro
a1.sinks.k2.hostname = h136
a1.sinks.k2.port = 4142 # Describe the channel
a1.channels.c1.type = memory
a1.channels.c1.capacity = 1000
a1.channels.c1.transactionCapacity = 100 a1.channels.c2.type = memory
a1.channels.c2.capacity = 1000
a1.channels.c2.transactionCapacity = 100 # Bind the source and sink to the channel
a1.sources.r1.channels = c1 c2
a1.sinks.k1.channel = c1
a1.sinks.k2.channel = c2
2.flume-flume-hdfs.conf
配置上级 Flume 输出的 Source，输出是到 HDFS 的 Sink。
# Name the components on this agent
a2.sources = r1
a2.sinks = k1
a2.channels = c1 # Describe/configure the source
# source 端的 avro 是一个数据接收服务
a2.sources.r1.type = avro
a2.sources.r1.bind = h136
a2.sources.r1.port = 4141 # Describe the sink
a2.sinks.k1.type = hdfs
a2.sinks.k1.hdfs.path = hdfs://h136:9000/flume2/%Y%m%d/%H
#上传文件的前缀
a2.sinks.k1.hdfs.filePrefix = flume2-
#是否按照时间滚动文件夹
a2.sinks.k1.hdfs.round = true
#多少时间单位创建一个新的文件夹
a2.sinks.k1.hdfs.roundValue = 1
#重新定义时间单位
a2.sinks.k1.hdfs.roundUnit = hour
#是否使用本地时间戳
a2.sinks.k1.hdfs.useLocalTimeStamp = true
#积攒多少个 Event 才 flush 到 HDFS 一次
a2.sinks.k1.hdfs.batchSize = 100
#设置文件类型，可支持压缩
a2.sinks.k1.hdfs.fileType = DataStream
#多久生成一个新的文件
a2.sinks.k1.hdfs.rollInterval = 600
#设置每个文件的滚动大小大概是 128M
a2.sinks.k1.hdfs.rollSize = 134217700
#文件的滚动与 Event 数量无关
a2.sinks.k1.hdfs.rollCount = 0 # Describe the channel
a2.channels.c1.type = memory
a2.channels.c1.capacity = 1000
a2.channels.c1.transactionCapacity = 100 # Bind the source and sink to the channel
a2.sources.r1.channels = c1
a2.sinks.k1.channel = c1
3.flume-flume-dir.conf
配置上级 Flume 输出的 Source，输出是到本地目录的 Sink。
输出的本地目录必须是已经存在的目录，如果该目录不存在，并不会创建新的目录。
# Name the components on this agent
a3.sources = r1
a3.sinks = k1
a3.channels = c2 # Describe/configure the source
a3.sources.r1.type = avro
a3.sources.r1.bind = h136
a3.sources.r1.port = 4142 # Describe the sink
a3.sinks.k1.type = file_roll
a3.sinks.k1.sink.directory = /tmp/flumeData # Describe the channel
a3.channels.c2.type = memory
a3.channels.c2.capacity = 1000
a3.channels.c2.transactionCapacity = 100 # Bind the source and sink to the channel
a3.sources.r1.channels = c2
a3.sinks.k1.channel = c2
二、测试
需要启动 HDFS，由于 flume-file-flume.conf 向另外两个发送数据，即 flume-flume-hdfs.conf 和 flume-flume-dir.conf 为服务端接收数据，需要在 flume-file-flume.conf 之前启动。
cd /opt/apache-flume-1.9.-bin bin/flume-ng agent --conf conf/ --name a3 --conf-file /tmp/flume-job/group1/flume-flume-dir.conf -Dflume.root.logger=INFO,console
bin/flume-ng agent --conf conf/ --name a2 --conf-file /tmp/flume-job/group1/flume-flume-hdfs.conf -Dflume.root.logger=INFO,console
bin/flume-ng agent --conf conf/ --name a1 --conf-file /tmp/flume-job/group1/flume-file-flume.conf -Dflume.root.logger=INFO,console
向监听文件追加数据，查看变化。
echo '789qwewqe' >> /tmp/tomcat.log
echo '123cvbcvbcv' >> /tmp/tomcat.log
echo '456jkuikmjh' >> /tmp/tomcat.log
