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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https://www.cnblogs.com/skywp/p/11684598.html