我正在用flume后台处理目录，并将文件上传到hdfs中。这些是txt/csv文件，我希望它们在hdfs中采用这种格式。但是flume正在将它们作为二进制文件加载。。。
这是我的配置：

tier1.sources  = source1
tier1.channels = channel1
tier1.sinks    = sink1

tier1.sources.source1.type     = spooldir
tier1.sources.source1.channels = channel1
tier1.sources.source1.spoolDir = /var/data
tier1.sources.source1.fileHeader = false
tier1.sources.source1.deletePolicy = immediate
tier1.channels.channel1.type   = memory
tier1.sinks.sink1.type         = hdfs
tier1.sinks.sink1.channel      = channel1
tier1.sinks.sink1.hdfs.path = /user/hdfs/%y-%m-%d/
tier1.sinks.sink1.hdfs.writeFormat=Text
tier1.sinks.sink1.hdfs.useLocalTimeStamp = true
tier1.sinks.sink1.hdfs.rollInterval = 30

tier1.channels.channel1.capacity = 100

我应该改变什么使flume将txt文件加载为txt文件？