SparkStreaming整合Flume的pull方式之启动报错解决方案

flume配置文件：

simple-agent.sources = netcat-source
simple-agent.sinks = spark-sink
simple-agent.channels = memory-channel

#describe/configure the source
simple-agent.sources.netcat-source.type = netcat
simple-agent.sources.netcat-source.bind = centos
simple-agent.sources.netcat-source.port= 44444

# describe the sink
simple-agent.sinks.spark-sink.type=org.apache.spark.streaming.flume.sink.sparksink
simple-agent.sinks.spark-sink.hostname= centos 
simple-agent.sinks.spark-sink.port= 41414

simple-agent.channels.memory-channel.type = memory
simple-agent.channels.memory-channel.capacity = 1000
simple-agent.channels.memory-channel.transactioncapacity = 100

simple-agent.sources.netcat-source.channels = memory-channel
simple-agent.sinks.spark-sink.channel = memory-channel

但是在启动flume时，报以下错误：

2019-10-16 11:35:14,559 (conf-file-poller-0) [error - org.apache.flume.node.pollingpropertiesfileconfigurationprovider$filewatcherrunnable.run(pollingpropertiesfileconfigurationprovider.java:142)] failed to load configuration data. exception follows.
org.apache.flume.flumeexception: unable to load sink type: org.apache.spark.streaming.flume.sink.sparksink, class: org.apache.spark.streaming.flume.sink.sparksink
    at org.apache.flume.sink.defaultsinkfactory.getclass(defaultsinkfactory.java:71)
    at org.apache.flume.sink.defaultsinkfactory.create(defaultsinkfactory.java:43)
    at org.apache.flume.node.abstractconfigurationprovider.loadsinks(abstractconfigurationprovider.java:410)
    at org.apache.flume.node.abstractconfigurationprovider.getconfiguration(abstractconfigurationprovider.java:98)
    at org.apache.flume.node.pollingpropertiesfileconfigurationprovider$filewatcherrunnable.run(pollingpropertiesfileconfigurationprovider.java:140)
    at java.util.concurrent.executors$runnableadapter.call(executors.java:511)
    at java.util.concurrent.futuretask.runandreset(futuretask.java:308)
    at java.util.concurrent.scheduledthreadpoolexecutor$scheduledfuturetask.access$301(scheduledthreadpoolexecutor.java:180)
    at java.util.concurrent.scheduledthreadpoolexecutor$scheduledfuturetask.run(scheduledthreadpoolexecutor.java:294)
    at java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1149)
    at java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:624)
    at java.lang.thread.run(thread.java:748)
caused by: java.lang.classnotfoundexception: org.apache.spark.streaming.flume.sink.sparksink
    at java.net.urlclassloader.findclass(urlclassloader.java:381)
    at java.lang.classloader.loadclass(classloader.java:424)
    at sun.misc.launcher$appclassloader.loadclass(launcher.java:349)
    at java.lang.classloader.loadclass(classloader.java:357)
    at java.lang.class.forname0(native method)
    at java.lang.class.forname(class.java:264)
    at org.apache.flume.sink.defaultsinkfactory.getclass(defaultsinkfactory.java:69)
    ... 11 more

解决方案：

由于用到了agent的sink是 org.apache.spark.streaming.flume.sink.sparksink类型，需要把spark-streaming-flume-sink_2.11-2.4.3.jar复制到flume的lib目录，否则，会报找不到org.apache.spark.streaming.flume.sink.sparksink类的错误。

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