第1节 flume：12、flume的load

1.5、flume的负载均衡load balancer

负载均衡是用于解决一台机器(一个进程)无法解决所有请求而产生的一种算法。Load balancing Sink Processor 能够实现 load balance 功能，如下图Agent1 是一个路由节点，负责将 Channel 暂存的 Event 均衡到对应的多个 Sink组件上，而每个 Sink 组件分别连接到一个独立的 Agent 上，示例配置，如下所示：

在此处我们通过三台机器来进行模拟flume的负载均衡

三台机器规划如下：

node01：采集数据，发送到node02和node03机器上去

node02：接收node01的部分数据

node03：接收node01的部分数据

第一步：开发node01服务器的flume配置

node01服务器配置：

cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin/conf

vim load_balancer_client.conf

#agent name

a1.channels = c1

a1.sources = r1

a1.sinks = k1 k2

#set gruop

a1.sinkgroups = g1

#set channel

a1.channels.c1.type = memory

a1.channels.c1.capacity = 1000

a1.channels.c1.transactionCapacity = 100

a1.sources.r1.channels = c1

a1.sources.r1.type = exec

a1.sources.r1.command = tail -F /export/servers/taillogs/access_log

# set sink1

a1.sinks.k1.channel = c1

a1.sinks.k1.type = avro

a1.sinks.k1.hostname = node02

a1.sinks.k1.port = 52020

# set sink2

a1.sinks.k2.channel = c1

a1.sinks.k2.type = avro

a1.sinks.k2.hostname = node03

a1.sinks.k2.port = 52020

#set sink group

a1.sinkgroups.g1.sinks = k1 k2

#set failover

a1.sinkgroups.g1.processor.type = load_balance

a1.sinkgroups.g1.processor.backoff = true

a1.sinkgroups.g1.processor.selector = round_robin

a1.sinkgroups.g1.processor.selector.maxTimeOut=10000

第二步：开发node02服务器的flume配置

cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin/conf

vim load_banlancer_server.conf

# Name the components on this agent

a1.sources = r1

a1.sinks = k1

a1.channels = c1

# Describe/configure the source

a1.sources.r1.type = avro

a1.sources.r1.channels = c1

a1.sources.r1.bind = node02

a1.sources.r1.port = 52020

# 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

第三步：开发node03服务器flume配置

node03服务器配置

cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin/conf

vim load_banlancer_server.conf

# Name the components on this agent

a1.sources = r1

a1.sinks = k1

a1.channels = c1

# Describe/configure the source

a1.sources.r1.type = avro

a1.sources.r1.channels = c1

a1.sources.r1.bind = node03

a1.sources.r1.port = 52020

# 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

第四步：准备启动flume服务

启动node03的flume服务

cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin

bin/flume-ng agent -n a1 -c conf -f conf/load_balancer_server.conf -Dflume.root.logger=DEBUG,console

启动node02的flume服务

cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin

bin/flume-ng agent -n a1 -c conf -f conf/load_balancer_server.conf -Dflume.root.logger=DEBUG,console

启动node01的flume服务

cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin

bin/flume-ng agent -n a1 -c conf -f conf/load_balancer_client.conf -Dflume.root.logger=DEBUG,console

第五步：node01服务器运行脚本产生数据

cd /export/servers/shells

sh tail-file.sh