集群采用3台机器：
host1 load-balance设置 host2 机器1 host3 机器2
其中，host1 机器配置：
#Define a memory channel called c1 on a1
a1.channels = c1
a1.sources = r1
a1.sinks = k1 k2
a1.sinkgroups = g1
a1.sinkgroups.g1.sinks = k1 k2
a1.sinkgroups.g1.processor.type = load_balance
a1.sinkgroups.g1.processor.selector = round_robin
a1.sinkgroups.g1.processor.backoff = true
a1.channels.c1.type = file
a1.channels.c1.checkpointDir = /tmp/flume/loadcheckpoint
a1.channels.c1.dataDirs = /tmp/flume/loaddata
a1.sources.r1.channels = c1
a1.sources.r1.type = avro
a1.sources.r1.bind = 0.0.0.0
a1.sources.r1.port = 41415
a1.sinks.k1.channel = c1
a1.sinks.k1.type = avro
a1.sinks.k1.hostname = host2
a1.sinks.k1.port = 41414
a1.sinks.k2.channel = c1
a1.sinks.k2.type = AVRO
a1.sinks.k2.hostname = host3
a1.sinks.k2.port = 41414
host2 机器配置：
a2.channels = c1
a2.sources = r1
a2.sinks = k1
a2.channels.c1.type = FILE
a1.channels.c1.checkpointDir = /tmp/flume/checkpoint
a1.channels.c1.dataDirs = /tmp/flume/data
a2.sources.r1.channels = c1
a2.sources.r1.type = AVRO
a2.sources.r1.bind = 0.0.0.0
a2.sources.r1.port = 41414
a2.sinks.k1.channel = c1
a2.sinks.k1.type = file_roll
a2.sinks.k1.sink.directory = /tmp/load/
a2.sinks.k1.sink.rollInterval = 0
host3 机器配置：
a2.channels = c1
a2.sources = r1
a2.sinks = k1
a2.channels.c1.type = FILE
a1.channels.c1.checkpointDir = /tmp/flume/checkpoint
a1.channels.c1.dataDirs = /tmp/flume/data
a2.sources.r1.channels = c1
a2.sources.r1.type = AVRO
a2.sources.r1.bind = 0.0.0.0
a2.sources.r1.port = 41414
a2.sinks.k1.channel = c1
a2.sinks.k1.type = file_roll
a2.sinks.k1.sink.directory = /tmp/load/
a2.sinks.k1.sink.rollInterval = 0
客户端机器暂时使用flume-ng的agent发送，配置如下：
# Define a memory channel called c1 on a1
a1.channels.c1.type = file
a1.channels.c1.checkpointDir = /tmp/flume/checkpoint
a1.channels.c1.dataDirs = /tmp/flume/data
a1.sources.r1.channels = c1
a1.sources.r1.type = exec
a1.sources.r1.command = cat /tmp/linux.log
a1.sinks.k1.type = avro
a1.sinks.k1.channel = c1
a1.sinks.k1.hostname = host1
a1.sinks.k1.port = 41415
a1.channels = c1
a1.sources = r1
a1.sinks = k1
客户端/tmp/linux.log文件3G左右，发送给host1。
启动：
host2：
bin/flume-ng agent -c conf -f conf/load-sink1.conf -n a2
host3：
bin/flume-ng agent -c conf -f conf/load-sink2.conf -n a2
host1：
bin/flume-ng agent -c conf -f conf/load-balance.conf -n a1
客户端：
bin/flume-ng agent -c conf -f conf/client.conf -n a1
注意：启动方式最好是从下往上启动。即：先启动host2和host3，然后启动host1，最后启动client。
测试过程中，可以随时将host2或host3停止，过一段时间再启动。
这样，就测试了flume-ng的load-balance和failover功能。