我试图从kafka主题中提取数据并将其写入hdfs，我的flume conf似乎与我在几个示例中看到的相同，但我似乎无法绕过下面的错误。我可以通过python从主题中消费，所以我知道我在那里很好。我使用的是flume版本1.6.0和java9.0.1。我做错了什么让它不接受Kafka的主题？

09 Jul 2018 17:17:26,973 INFO  [conf-file-poller-0] (org.apache.flume.node.AbstractConfigurationProvider.loadChannels:145) -Creating channels
09 Jul 2018 17:17:26,984 INFO  [conf-file-poller-0] (org.apache.flume.channel.DefaultChannelFactory.create:42)  - Creating instance of channel kafka_hdfs_channel type memory
09 Jul 2018 17:17:26,989 INFO  [conf-file-poller-0] (org.apache.flume.node.AbstractConfigurationProvider.loadChannels:200)  - Created channel kafka_hdfs_channel

09 Jul 2018 17:17:26,989 INFO  [conf-file-poller-0] (org.apache.flume.source.DefaultSourceFactory.create:41)  - Creating instance of source kafka_source, type org.apache.flume.source.kafka.KafkaSource
09 Jul 2018 17:17:26,993 ERROR [conf-file-poller-0] (org.apache.flume.node.AbstractConfigurationProvider.loadSources:361)  - Source kafka_source has been removed due to an error during configuration
org.apache.flume.conf.ConfigurationException: Kafka topic must be specified.
    at org.apache.flume.source.kafka.KafkaSource.configure(KafkaSource.java:180)
    at org.apache.flume.conf.Configurables.configure(Configurables.java:41)
    at org.apache.flume.node.AbstractConfigurationProvider.loadSources(AbstractConfigurationProvider.java:326)
    at org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(AbstractConfigurationProvider.java:97)
    at org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:140)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
    at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
    at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:300)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    at java.base/java.lang.Thread.run(Thread.java:844)}

这是我的Flume配置：

agentCDIS.sources = kafka_source
agentCDIS.channels = kafka_hdfs_channel
agentCDIS.sinks = hdfs_sink

agentCDIS.sources.kafka_source.type = org.apache.flume.source.kafka.KafkaSource
agentCDIS.sources.kafka_source.kafka.bootstrap.servers = 10.4.3.61:9092, 10.4.3.62:9092, 10.4.3.63:9092
agentCDIS.sources.kafka_source.kafka.topic = test
agentCDIS.sources.kafka_source.kafka.consumer.group.id = cn_flume_group
agentCDIS.sources.kafka_source.channels = kafka_hdfs_channel
agentCDIS.sources.kafka_source.interceptors = i1
agentCDIS.sources.kafka_source.interceptors.i1.type = timestamp
agentCDIS.sources.kafka_source.kafka.consumer.timeout.ms = 1000

agentCDIS.channels.kafka_hdfs_channel.type = memory
agentCDIS.channels.kafka_hdfs_channel.capacity = 10000
agentCDIS.channels.kafka_hdfs_channel.transactionCapacity = 1000

agentCDIS.sinks.hdfs_sink.type = hdfs
agentCDIS.sinks.hdfs_sink.hdfs.path = hdfs://10.4.16.16:8020/user/cnelson/kafka/%{topic}/%y-%m-%d
agentCDIS.sinks.hdfs_sink.hdfs.rollInterval = 5
agentCDIS.sinks.hdfs_sink.hdfs.rollSize = 0
agentCDIS.sinks.hdfs_sink.fileType = DataStream
agentCDIS.sinks.hdfs_sink.channel = kafka_hdfs_channel

agentCDIS.sinks.loggerSink.type = logger
agentCDIS.sinks.loggerSink.kafka_hdfs_channel = memoryChannel

agentCDIS.channels.memoryChannel.type = memory
agentCDIS.channels.memoryChannel.capacity = 100