title: Low Latency data access in HDFS ,Hadoop
body: <p>I am reading tutorials on Big Data and Hadoop where I found these 2 points on HDFS</p>
  
  <blockquote>
    <p><strong>Streaming Data Access:</strong> The time to read whole data set is more important than latency in reading the first. HDFS is built on write-once and read-many- times pattern.</p>
  </blockquote>
  
  <p>&amp;</p>
  
  <blockquote>
    <p><strong>Low Latency data access:</strong> Applications that require very less time to access the first data should not use HDFS as it is giving importance to whole data rather than time to fetch the first record.</p>
  </blockquote>
  
  <p>I am confused because 1st one says <em>The time to read whole data set is more important</em> and second one says <em>...should not use HDFS as it is giving importance to whole data</em></p>
  
  <p>I don't understand what is expected? I am new to Hadoop.</p>