flume使用hdfs sinks时候报错:org.apache.flume.EventDeliveryException: java.lang.NullPointerException: Expected timestamp in the Flume event headers, but it was null
解决方法:sink是hdfs,然后使用目录自动生成功能。出现如题的错误,看官网文档说的是需要在每个文件记录行的开头需要有时间戳,但是时间戳的格式可能比较难调节,所以亦可设置 hdfs.useLocalTimeStamp这个参数,比如以每个小时作为一个文件夹
# Describe the sink
a1.sinks.k1.type=hdfs
a1.sinks.k1.hdfs.path=hdfs://node0:8020/user/flume/%Y-%m-%d
a1.sinks.k1.hdfs.rollSize=10240000
a1.sinks.k1.hdfs.rollInterval=0
a1.sinks.k1.hdfs.rollCount=0
a1.sinks.k1.hdfs.idleTimeout=5
a1.sinks.k1.hdfs.fileType=DataStream
a1.sinks.k1.hdfs.useLocalTimeStamp = true