Why HDFS is write once and read multiple times?

Question

I am a new learner of Hadoop.

While reading about Apache HDFS I learned that HDFS is write once file system. Some other distributions ( Cloudera) provides append fea

Answer 1

An advantage of this technique is that you don't have to bother with synchronization. Since you write once, your reader are guaranteed that the data will not be manipulated while they read.