flume高并发优化——（2）精简结构

        大家在上篇博客中，可以看到，对flume本身的优化，我们可以说是一个较大的进步，但是，后期梳理时，发现，数据的处理经过了很多没有必要的步骤，我们的处理有些多余，但是精简哪里，又成为了一个问题，本篇博客带领大家一起看看，精简的关键位置及效果。

还是老样子，大家会议上篇博客的架构：

        不难看出，有一个性能点就是从主端口下发的时候，三个端口到es的过程中，为了让数据有较好的缓冲，我们使用了kafka作为缓冲区，但是三个flume先得有些多余，我们可以使用首端（第一个flume）做到三个输出，不再是avro端口，而是直接和kafka对接，大家看优化之后的图：

配置：

balance.sources = source1
balance.sinks = k1 k2 k3 k4
balance.channels = channel1

# Describe/configure source1
balance.sources.source1.type = avro
balance.sources.source1.bind = 192.168.10.83
balance.sources.source1.port = 12300

#define sinkgroups
balance.sinkgroups=g1
balance.sinkgroups.g1.sinks=k1 k2 k3 k4
balance.sinkgroups.g1.processor.type=load_balance
balance.sinkgroups.g1.processor.backoff=true
balance.sinkgroups.g1.processor.selector=round_robin

#define the sink 1
balance.sinks.k1.type = org.apache.flume.sink.kafka.KafkaSink
balance.sinks.k1.topic = ulog
balance.sinks.k1.brokerList = 192.168.10.83:9092,192.168.10.84:9092
balance.sinks.k1.requiredAcks = 1
balance.sinks.k1.batchSize = 10000


#define the sink 2
balance.sinks.k2.type = org.apache.flume.sink.kafka.KafkaSink
balance.sinks.k2.topic = ulog
balance.sinks.k2.brokerList = 192.168.10.83:9092,192.168.10.84:9092
balance.sinks.k2.requiredAcks = 1
balance.sinks.k2.batchSize = 10000

#define the sink 3
balance.sinks.k3.type = org.apache.flume.sink.kafka.KafkaSink
balance.sinks.k3.topic = ulog
balance.sinks.k3.brokerList = 192.168.10.83:9092,192.168.10.84:9092
balance.sinks.k3.requiredAcks = 1
balance.sinks.k3.batchSize = 10000

#define the sink 4
balance.sinks.k4.type = org.apache.flume.sink.kafka.KafkaSink
balance.sinks.k4.topic = ulog
balance.sinks.k4.brokerList = 192.168.10.83:9092,192.168.10.84:9092
balance.sinks.k4.requiredAcks = 1
balance.sinks.k4.batchSize = 10000


# Use a channel which buffers events in memory
balance.channels.channel1.type = file
balance.channels.channel1.checkpointDir = /export/data/flume/flume-1.6.0/dataeckPoint/balance
balance.channels.channel1.useDualCheckpoints = true
balance.channels.channel1.backupCheckpointDir = /export/data/flume/flume-1.6.0/data/bakcheckPoint/balance
balance.channels.channel1.dataDirs =/export/data/flume/flume-1.6.0/data/balance
balance.channels.channel1.transactionCapacity = 10000
balance.channels.channel1.checkpointInterval = 30000
balance.channels.channel1.maxFileSize = 2146435071
balance.channels.channel1.minimumRequiredSpace = 524288000
balance.channels.channel1.capacity = 1000000
balance.channels.channel1.keep-alive=3

# Bind the source and sink to the channel
balance.sources.source1.channels = channel1
balance.sinks.k1.channel = channel1
balance.sinks.k2.channel=channel1
balance.sinks.k3.channel=channel1
balance.sinks.k4.channel=channel1

        这样我们就将5个flume优化为2个flume，在flume身上加载的瓶颈就会减少很多，因为没有sinkgroups，它还是一个多线程的处理方式，这样，我们就将这样的瓶颈固定在2个节点，下一步，我们的优化方向就是flume的filechannel，因为，我们发现这样的架构运行一端时间后，系统io有较大消耗。

总结：

        有时候，我们的增加，是为了负载均衡，这是没有问题的，但是如果负载均衡的分发端成了瓶颈，或者传输介质，或者存储介质成了瓶颈，我们不妨向多线程方向考虑，就会有更大的天地。