here's an example, file type doesn't matter as everything is bytes. You can the ingest csv with Hive, pig or spark. http://www.lampdev.org/programming/hadoop/apache-flume-spooldir-sink-tutorial.html
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Go to the node and investigate the data dir directory you specified. Run hdfs fsck / command see if you have issue with hdfs, post screenshot of main page of Ambari with all widgets.
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Is your replication factor set to 3? Are you using one reducer in your ingestion? You can use hdfs balancer to spread the data around your cluster https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HDFSCommands.html#Administration_Commands
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