大数据学习——高可用配置案例

（一）、failover故障转移

在完成单点的Flume NG搭建后，下面我们搭建一个高可用的Flume NG集群，架构图如下所示：

（1）节点分配

Flume的Agent和Collector分布如下表所示：

名称	Ip地址	Host	角色
Agent1	192.168.200.101	Itcast01	WebServer
Collector1	192.168.200.102	Itcast02	AgentMstr1
Collector2	192.168.200.103	Itcast03	AgentMstr2

Agent1数据分别流入到Collector1和Collector2，Flume NG本身提供了Failover机制，可以自动切换和恢复。下面我们开发配置Flume NG集群。

（2）配置

在下面单点Flume中，基本配置都完成了，我们只需要新添加两个配置文件，它们是flume-client.conf和flume-server.conf，其配置内容如下所示：

1、itcast01上的flume-client.conf配置

#agent1 name

agent1.channels = c1

agent1.sources = r1

agent1.sinks = k1 k2

#set gruop

agent1.sinkgroups = g1

#set sink group

agent1.sinkgroups.g1.sinks = k1 k2

#set channel

agent1.channels.c1.type = memory

agent1.channels.c1.capacity = 1000

agent1.channels.c1.transactionCapacity = 100

agent1.sources.r1.channels = c1

agent1.sources.r1.type = exec

agent1.sources.r1.command = tail -F /root/log/test.log

agent1.sources.r1.interceptors = i1 i2

agent1.sources.r1.interceptors.i1.type = static

agent1.sources.r1.interceptors.i1.key = Type

agent1.sources.r1.interceptors.i1.value = LOGIN

agent1.sources.r1.interceptors.i2.type = timestamp

# set sink1

agent1.sinks.k1.channel = c1

agent1.sinks.k1.type = avro

agent1.sinks.k1.hostname = itcast02

agent1.sinks.k1.port = 52020

# set sink2

agent1.sinks.k2.channel = c1

agent1.sinks.k2.type = avro

agent1.sinks.k2.hostname = itcast03

agent1.sinks.k2.port = 52020

#set failover

agent1.sinkgroups.g1.processor.type = failover

agent1.sinkgroups.g1.processor.priority.k1 = 10

agent1.sinkgroups.g1.processor.priority.k2 = 5

agent1.sinkgroups.g1.processor.maxpenalty = 10000

#这里首先要申明一个sinkgroups,然后再设置2个sink ,k1与k2,其中2个优先级是10和5，#而processor的maxpenalty被设置为10秒，默认是30秒。‘

启动命令：

bin/flume-ng agent -n agent1 -c conf -f conf/flume-client.conf

-Dflume.root.logger=DEBUG,console

2、Itcast02和itcast03上的flume-server.conf配置

#set Agent name

a1.sources = r1

a1.channels = c1

a1.sinks = k1

 

#set channel

a1.channels.c1.type = memory

a1.channels.c1.capacity = 1000

a1.channels.c1.transactionCapacity = 100

 

# other node,nna to nns

a1.sources.r1.type = avro

a1.sources.r1.bind = 0.0.0.0

a1.sources.r1.port = 52020

a1.sources.r1.channels = c1

a1.sources.r1.interceptors = i1 i2

a1.sources.r1.interceptors.i1.type = timestamp

a1.sources.r1.interceptors.i2.type = host

a1.sources.r1.interceptors.i2.hostHeader=hostname

 

#set sink to hdfs

a1.sinks.k1.type=hdfs

a1.sinks.k1.hdfs.path=/data/flume/logs/%{hostname}

a1.sinks.k1.hdfs.filePrefix=%Y-%m-%d

a1.sinks.k1.hdfs.fileType=DataStream

a1.sinks.k1.hdfs.writeFormat=TEXT

a1.sinks.k1.hdfs.rollInterval=10

a1.sinks.k1.channel=c1

 

启动命令：

bin/flume-ng agent -n agent1 -c conf -f conf/flume-server.conf

-Dflume.root.logger=DEBUG,console

（3）测试failover

1、先在itcast02和itcast03上启动脚本

bin/flume-ng agent -n a1 -c conf -f conf/flume-server.conf

-Dflume.root.logger=DEBUG,console

2、然后启动itcast01上的脚本

bin/flume-ng agent -n agent1 -c conf -f conf/flume-client.conf

-Dflume.root.logger=DEBUG,console

3、Shell脚本生成数据

 while true;do date >> test.log; sleep 1s ;done

4、观察HDFS上生成的数据目录。只观察到itcast02在接受数据

5、Itcast02上的agent被干掉之后，继续观察HDFS上生成的数据目录，itcast03对应的ip目录出现，此时数据收集切换到itcast03上

6、Itcast02上的agent重启后，继续观察HDFS上生成的数据目录。此时数据收集切换到itcast02上，又开始继续工作！

（二）、load balance负载均衡

（1）节点分配

如failover故障转移的节点分配

（2）配置

在failover故障转移的配置上稍作修改

itcast01上的flume-client-loadbalance.conf配置

#agent1 name

agent1.channels = c1

agent1.sources = r1

agent1.sinks = k1 k2

#set gruop

agent1.sinkgroups = g1

#set channel

agent1.channels.c1.type = memory

agent1.channels.c1.capacity = 1000

agent1.channels.c1.transactionCapacity = 100

agent1.sources.r1.channels = c1

agent1.sources.r1.type = exec

agent1.sources.r1.command = tail -F /root/log/test.log

# set sink1

agent1.sinks.k1.channel = c1

agent1.sinks.k1.type = avro

agent1.sinks.k1.hostname = itcast02

agent1.sinks.k1.port = 52020

# set sink2

agent1.sinks.k2.channel = c1

agent1.sinks.k2.type = avro

agent1.sinks.k2.hostname = itcast03

agent1.sinks.k2.port = 52020

#set sink group

agent1.sinkgroups.g1.sinks = k1 k2

#set load-balance

agent1.sinkgroups.g1.processor.type = load_balance

# 默认是round_robin，还可以选择random

agent1.sinkgroups.g1.processor.selector = round_robin

#如果backoff被开启，则 sink processor会屏蔽故障的sink

agent1.sinkgroups.g1.processor.backoff = true

Itcast02和itcast03上的flume-server-loadbalance.conf配置

#set Agent name

a1.sources = r1

a1.channels = c1

a1.sinks = k1

#set channel

a1.channels.c1.type = memory

a1.channels.c1.capacity = 1000

a1.channels.c1.transactionCapacity = 100

# other node,nna to nns

a1.sources.r1.type = avro

a1.sources.r1.bind = 0.0.0.0

a1.sources.r1.port = 52020

a1.sources.r1.channels = c1

a1.sources.r1.interceptors = i1 i2

a1.sources.r1.interceptors.i1.type = timestamp

a1.sources.r1.interceptors.i2.type = host

a1.sources.r1.interceptors.i2.hostHeader=hostname

a1.sources.r1.interceptors.i2.useIP=false

#set sink to hdfs

a1.sinks.k1.type=hdfs

a1.sinks.k1.hdfs.path=/data/flume/loadbalance/%{hostname}

a1.sinks.k1.hdfs.fileType=DataStream

a1.sinks.k1.hdfs.writeFormat=TEXT

a1.sinks.k1.hdfs.rollInterval=10

a1.sinks.k1.channel=c1

a1.sinks.k1.hdfs.filePrefix=%Y-%m-%d

（3）测试load balance

1、先在itcast02和itcast03上启动脚本

bin/flume-ng agent -n a1 -c conf -f conf/flume-server-loadbalance.conf

-Dflume.root.logger=DEBUG,console

2、然后启动itcast01上的脚本

bin/flume-ng agent -n agent1 -c conf -f conf/flume-client-loadbalance.conf

-Dflume.root.logger=DEBUG,console

3、Shell脚本生成数据

 while true;do date >> test.log; sleep 1s ;done

4、观察HDFS上生成的数据目录，由于轮训机制都会收集到数据

  5、Itcast02上的agent被干掉之后，itcast02上不在产生数据

  6、Itcast02上的agent重新启动后，两者都可以接受到数据