1 官网内容

2 看一张图一目了然

3 详细配置

　　source配置文件

#配置文件：
    a1.sources= r1
    a1.sinks= k1 k2
    a1.channels= c1
    
    #负载平衡
    a1.sinkgroups = g1
    a1.sinkgroups.g1.sinks = k1 k2
    a1.sinkgroups.g1.processor.type = failover
    a1.sinkgroups.g1.processor.priority.k1 = 5
    a1.sinkgroups.g1.processor.priority.k2 = 10
    a1.sinkgroups.g1.processor.maxpenalty = 1000
    
    
    
    #Describe/configure the source
    a1.sources.r1.type= exec
    a1.sources.r1.command= tail -F /tmp/logs/test.log
    
    
    #Describe the sink
    a1.sinks.k1.type= avro
    a1.sinks.k1.hostname= 127.0.0.1
    a1.sinks.k1.port= 50001
    
    a1.sinks.k2.type= avro
    a1.sinks.k2.hostname= 127.0.0.1
    a1.sinks.k2.port= 50002
    
    # Usea channel which buffers events in memory
    a1.channels.c1.type= memory
    a1.channels.c1.capacity= 1000
    a1.channels.c1.transactionCapacity= 100
    
    # set channel
    a1.sinks.k1.channel= c1
    a1.sinks.k2.channel= c1
    a1.sources.r1.channels= c1

　　sink1配置文件

# Name the components on this agent
    a2.sources = r1
    a2.sinks = k1
    a2.channels = c1
    
    # Describe/configure the source
    a2.sources.r1.type = avro
    a2.sources.r1.channels = c1
    a2.sources.r1.bind = 127.0.0.1
    a2.sources.r1.port = 50001
    
    # Describe the sink
    a2.sinks.k1.type = logger
    a2.sinks.k1.channel = c1
    
    # Use a channel which buffers events inmemory
    a2.channels.c1.type = memory
    a2.channels.c1.capacity = 1000
    a2.channels.c1.transactionCapacity = 100

　　sink2配置

# Name the components on this agent
    a3.sources = r1
    a3.sinks = k1
    a3.channels = c1
    
    # Describe/configure the source
    a3.sources.r1.type = avro
    a3.sources.r1.channels = c1
    a3.sources.r1.bind = 127.0.0.1
    a3.sources.r1.port = 50002
    
    # Describe the sink
    a3.sinks.k1.type = logger
    a3.sinks.k1.channel = c1
    
    # Use a channel which buffers events inmemory
    a3.channels.c1.type = memory
    a3.channels.c1.capacity = 1000
    a3.channels.c1.transactionCapacity = 100

4 启动服务

先启动sink1 sink2 再启动source
            
    flume-ng agent -c conf -f /mnt/software/flume-1.6.0/flume-conf/failOver/sink2.conf -n a3 -Dflume.root.logger=DEBUG,console
    flume-ng agent -c conf -f /mnt/software/flume-1.6.0/flume-conf/failOver/sink1.conf -n a2 -Dflume.root.logger=DEBUG,console
    flume-ng agent -c conf -f /mnt/software/flume-1.6.0/flume-conf/failOver/load_source_case.conf -n a1 -Dflume.root.logger=DEBUG,console

　　5 效果测试

启动后第一次走了sink2
  
           : /127.0.0.1:42828
    19/02/21 23:45:47 INFO sink.LoggerSink: Event: { headers:{} body: 68 61 64 6F 6F 70                               hadoop }
    19/02/21 23:45:47 INFO sink.LoggerSink: Event: { headers:{} body: 7A 68 61 6E 67 6A 69 6E                         zhangjin }
    19/02/21 23:45:47 INFO sink.LoggerSink: Event: { headers:{} body: 78 78 78 78                                     xxxx }
    19/02/21 23:45:47 INFO sink.LoggerSink: Event: { headers:{} body: 79 79 79 79                                     yyyy }
    19/02/21 23:45:47 INFO sink.LoggerSink: Event: { headers:{} body: 7A 68 61 6E 67 6A 69 6E                         zhangjin }
    19/02/21 23:45:47 INFO sink.LoggerSink: Event: { headers:{} body: 78 78 78 78                                     xxxx }
    19/02/21 23:45:47 INFO sink.LoggerSink: Event: { headers:{} body: 79 79 79 79                                     yyyy }
    19/02/21 23:45:47 INFO sink.LoggerSink: Event: { headers:{} body: 7A 68 61 6E 67 6A 69 6E                         zhangjin }
    19/02/21 23:45:47 INFO sink.LoggerSink: Event: { headers:{} body: 78 78 78 78                                     xxxx }
    19/02/21 23:45:47 INFO sink.LoggerSink: Event: { headers:{} body: 79 79 79 79                                     yyyy }        
    
挂掉sink2,之后source感知到sink2挂了
    
    Caused by: java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
        at org.jboss.netty.channel.socket.nio.NioClientBoss.connect(NioClientBoss.java:148)
        at org.jboss.netty.channel.socket.nio.NioClientBoss.processSelectedKeys(NioClientBoss.java:104)
        at org.jboss.netty.channel.socket.nio.NioClientBoss.process(NioClientBoss.java:78)
        at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
        at org.jboss.netty.channel.socket.nio.NioClientBoss.run(NioClientBoss.java:41)
        ... 3 more    
        
        
数据发往sink1
    
        19/02/21 23:45:41 INFO ipc.NettyServer: [id: 0x77bfe0b5, /127.0.0.1:47142 => /127.0.0.1:50001] BOUND: /127.0.0.1:50001
    19/02/21 23:45:41 INFO ipc.NettyServer: [id: 0x77bfe0b5, /127.0.0.1:47142 => /127.0.0.1:50001] CONNECTED: /127.0.0.1:47142
    19/02/21 23:47:14 INFO sink.LoggerSink: Event: { headers:{} body: 7A 68 61 6E 67 6A 69 6E                         zhangjin }
    19/02/21 23:47:14 INFO sink.LoggerSink: Event: { headers:{} body: 78 78 78 78                                     xxxx }
    19/02/21 23:47:14 INFO sink.LoggerSink: Event: { headers:{} body: 79 79 79 79                                     yyyy }

　　6 总结，从效果来看sink2挂了之后，数据发往sink1，实现了失败迁移的功能。