title: Why do we need Hadoop KMS?
body: <p>I am not sure why do we need this <code>Hadoop KMS</code> exactly for ? I went through the official documentation of Apache Hadoop and there is not exactly mentioned why do we need this concept. The only thing which is clear with me is that using this <code>client</code> and <code>server</code> can share keys over <code>http</code> or <code>https</code>  using <code>REST APIs</code> and then there are various ways of authentication. Is it from security perspective ?? Can somebody explain it to me in layman terms what exactly it is ??<br>
  Do correct me if I am wrong anywhere .</p>