What happens if two clients try writing into the same HDFS file?
In an HDFS system, when the first client contacts the NameNode for writing the file, NameNode grants the client to create this file. But, when the second client opens the same data for writing, NameNode confirms that one client is already given access to writing the file; hence, it rejects the second client's open request.
BY Best Interview Question ON 02 Jun 2020