linux - 异常(exception)如下。 org.apache.flume.FlumeException : Unable to load source type in flume twitter analysis 异常

Question

我正在尝试使用 Flume 和 Hive 进行 Twitter 分析。为了从 twitter 获取推文，我在 flume.conf 文件中设置了所有必需的参数(consumerKey、consumerSecret、accessToken 和 accessTokenSecret)。

TwitterAgent.sources = Twitter TwitterAgent.channels = MemChannel
TwitterAgent.sinks = HDFS   TwitterAgent.sources.Twitter.type =
com.cloudera.flume.source.TwitterSource
TwitterAgent.sources.Twitter.channels = MemChannel
TwitterAgent.sources.Twitter.consumerKey = <consumerKey>
TwitterAgent.sources.Twitter.consumerSecret = <consumerSecret>
TwitterAgent.sources.Twitter.accessToken = <accessToken>
TwitterAgent.sources.Twitter.accessTokenSecret = <accessTokenSecret 
TwitterAgent.sources.Twitter.keywords = hadoop, big data, analytics,
bigdata, cloudera, data science, data scientiest, business
intelligence, mapreduce, data warehouse, data warehousing, mahout,
hbase, nosql, newsql, businessintelligence, cloudcomputing  
TwitterAgent.sinks.HDFS.channel = MemChannel
TwitterAgent.sinks.HDFS.type = hdfs TwitterAgent.sinks.HDFS.hdfs.path
= hdfs://localhost:9000/user/flume/tweets/ TwitterAgent.sinks.HDFS.hdfs.fileType = DataStream
TwitterAgent.sinks.HDFS.hdfs.writeFormat = Text
TwitterAgent.sinks.HDFS.hdfs.batchSize = 1000
TwitterAgent.sinks.HDFS.hdfs.rollSize = 0
TwitterAgent.sinks.HDFS.hdfs.rollCount = 10000  
TwitterAgent.channels.MemChannel.type = memory
TwitterAgent.channels.MemChannel.capacity = 10000
TwitterAgent.channels.MemChannel.transactionCapacity = 100

我已经使用 bash rc 为 flume tar ball 和 flume 源快照 jar 文件设置了类路径。

export FLUME_HOME=/home/students/apache-flume-1.4.0-bin 
export FLUME_SRC=/home/students/flume-sources-1.0-SNAPSHOT.jar 
export PATH=$FLUME_HOME/bin:$FLUME_SRC/bin:$PATH

当我运行 flume agent 时

flume-ng agent --conf-file twitter_flume.conf --name TwitterAgent -Dflume.root.logger=INFO,console -n TwitterAgent

我可以看到下面的日志跟踪，但没有任何反应

15/06/23 23:41:55 INFO source.DefaultSourceFactory: Creating instance
of source Twitter, type com.cloudera.flume.source.TwitterSource
15/06/23 23:41:55 ERROR
node.PollingPropertiesFileConfigurationProvider: Failed to load
configuration data. Exception follows.
org.apache.flume.FlumeException: Unable to load source type:
com.cloudera.flume.source.TwitterSource, class:
com.cloudera.flume.source.TwitterSource     at
org.apache.flume.source.DefaultSourceFactory.getClass(DefaultSourceFactory.java:67)
    at
org.apache.flume.source.DefaultSourceFactory.create(DefaultSourceFactory.java:40)
    at
org.apache.flume.node.AbstractConfigurationProvider.loadSources(AbstractConfigurationProvider.java:327)
    at
org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(AbstractConfigurationProvider.java:102)
    at
org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:140)
    at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
    at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
    at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744) Caused by:
java.lang.ClassNotFoundException:
com.cloudera.flume.source.TwitterSource     at
java.net.URLClassLoader$1.run(URLClassLoader.java:366)  at
java.net.URLClassLoader$1.run(URLClassLoader.java:355)  at
java.security.AccessController.doPrivileged(Native Method)  at
java.net.URLClassLoader.findClass(URLClassLoader.java:354)  at
java.lang.ClassLoader.loadClass(ClassLoader.java:425)   at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)   at
java.lang.ClassLoader.loadClass(ClassLoader.java:358)   at
java.lang.Class.forName0(Native Method)     at
java.lang.Class.forName(Class.java:190)     at
org.apache.flume.source.DefaultSourceFactory.getClass(DefaultSourceFactory.java:65)
    ... 11 more

我可以知道为什么当我已经设置了 flume source.jar 时会抛出这个错误吗？请帮我解决这个问题。

Answer 1

您没有设置类路径，而是设置了 PATH(用于查找可执行二进制文件，而不是 Java .jar 文件)。

您可以在 Flume conf 目录的 flume-env.sh 文件中设置 FLUME_CLASSPATH 变量；或添加 -classpath <path/to/the/jar>命令行选项。