title: Query on hadoop namenode -format command
body: <p>While doing "hadoop namenode -format", below message comes.</p>
  
  <pre><code>Re-format filesystem in Storage Directory /opt/data/temp/dfs/name ? (Y or N)
  </code></pre>
  
  <p>What should one give here? "Y" or "N".</p>
  
  <p>If given Y, will it lose data from HDFS?</p>