HDFS supports large file storage, and supports multiple users to write to the same file at the same time, and to modify any position of the file.

Question

Options

• ATrue
• BFalse

• A
  22% (13)
• B
  78% (45)

Explanation

B is correct because HDFS is designed on a write-once, read-many model - it does not support multiple concurrent writers to the same file, nor does it allow random (arbitrary position) writes or in-place modifications. Once a file is written and closed, it is essentially immutable; only sequential appends are supported (and even that was a later addition).

The statement is partially seductive because the first clause - HDFS supports large file storage - is absolutely true; that is in fact HDFS's primary design goal (files in the GB–TB range). The falsehood lies in the second half: concurrent multi-user writes and random-position edits are explicitly not supported, as these would conflict with HDFS's block-replication model and its optimization for high-throughput streaming reads over a distributed cluster.

Memory tip: Think of HDFS files like a published book - you can read it from anywhere and many people can read simultaneously, but once it's printed you can't go back and rewrite a random paragraph. "Write once, read many" is the phrase to remember for HDFS.

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