我正试图通过flume把Kafka的数据放到hdfs中。Kafka的制作人每10秒发送一条信息。我想收集所有的消息在一个文件中的hdfs。这是我使用的flume的配置，但它在hdfs上存储了许多文件（一个用于消息）：

agent1.sources.kafka-source.type = org.apache.flume.source.kafka.KafkaSource
agent1.sources.kafka-source.zookeeperConnect = localhost:2181
agent1.sources.kafka-source.topic = prova
agent1.sources.kafka-source.groupId = flume
agent1.sources.kafka-source.channels = memory-channel
agent1.sources.kafka-source.interceptors = i1
agent1.sources.kafka-source.interceptors.i1.type = timestamp
agent1.sources.kafka-source.kafka.consumer.timeout.ms = 100
agent1.channels.memory-channel.type = memory
agent1.channels.memory-channel.capacity = 10000
agent1.channels.memory-channel.transactionCapacity = 1000
agent1.sinks.hdfs-sink.type = hdfs
agent1.sinks.hdfs-sink.hdfs.path = hdfs://localhost:9000/input
agent1.sinks.hdfs-sink.hdfs.rollInterval = 5
agent1.sinks.hdfs-sink.hdfs.rollSize = 0
agent1.sinks.hdfs-sink.hdfs.rollCount = 0
agent1.sinks.hdfs-sink.hdfs.fileType = DataStream
agent1.sinks.hdfs-sink.channel = memory-channel
agent1.sources = kafka-source
agent1.channels = memory-channel
agent1.sinks = hdfs-sink

p、 从一个.csv文件开始。Kafka制作人获取文件并选择一些感兴趣的字段，然后每10秒发送一个条目。flume将条目存储在hadoop hdfs上，但是存储在许多文件中（1个条目=1个文件）。我希望所有的条目都在一个文件中。如何改变Flume的配置？