add new feature for integration with oozie: to create done file for HDFS Sink to signal a folder transfer complete. it need following params, the reason using timer is to create doneFlag for latest folder when long time no new file coming.
hdfs.doneFlag=done (default disabled) hdfs.useLocalTimeStamp=true (must use local time to enable doneFlag) hdfs.checkFolderDoneTimerInterval=60 (timer interval(seconds) to check if create doneFlag)