我正在学习hadoop、flume等，我开始的一个项目是情绪分析，这是可以的，但现在我试图通过收集多组数据来扩展，这是my flume.conf：

TwitterAgent.sources = Twitter
    TwitterAgent.channels = MemChannel
    TwitterAgent.sinks = HDFS HDFS2
    TwitterAgent.sources.Twitter.type = com.cloudera.flume.source.TwitterSource
    TwitterAgent.sources.Twitter.channels = MemChannel
    TwitterAgent.sources.Twitter.consumerKey = xxx
    TwitterAgent.sources.Twitter.consumerSecret = xxxx
    TwitterAgent.sources.Twitter.accessToken = xxx
    TwitterAgent.sources.Twitter.accessTokenSecret = xxxx
    TwitterAgent.sources.Twitter.keywords = bbc
    TwitterAgent.sinks.HDFS.channel = MemChannel
    TwitterAgent.sinks.HDFS.type = hdfs
    TwitterAgent.sinks.HDFS.hdfs.path = hdfs://xxx:8020/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

我希望实现的是把所有关于bbc的tweet放在上面的位置，同时使用下面的配置将关于利物浦的tweet放在一个单独的文件夹中：

TwitterAgent.sources.Twitter.keywords = liverpool
    TwitterAgent.sinks.HDFS2.channel = MemChannel
    TwitterAgent.sinks.HDFS2.type = hdfs
    TwitterAgent.sinks.HDFS2.hdfs.path = hdfs://xxx:8020/user/flume/tweets/liverpool/
    TwitterAgent.sinks.HDFS2.hdfs.fileType = DataStream
    TwitterAgent.sinks.HDFS2.hdfs.writeFormat = Text
    TwitterAgent.sinks.HDFS2.hdfs.batchSize = 1000
    TwitterAgent.sinks.HDFS2.hdfs.rollSize = 0
    TwitterAgent.sinks.HDFS2.hdfs.rollCount = 10000
    TwitterAgent.channels.MemChannel2.type = memory
    TwitterAgent.channels.MemChannel2.capacity = 10000
    TwitterAgent.channels.MemChannel2.transactionCapacity = 10

这不起作用，我也不明白为什么，有人能给我指出正确的方向吗？