title: Regarding Hadoop failure and new HBase?
body: <p>I have 2 questions:</p>
  
  <pre><code>1. Is NameNode still single point of failure in Hadoop YARN or new version of Hadoop e.g. 2.5?
  </code></pre>
  
  <p>What is the single point of failure in Hadoop?</p>
  
  <pre><code>2.  I saw Facebook is using HydraBase. Is HydraBase new version Hbase or is it new DBMS similar to Hbase?
  </code></pre>
  
  <p>Does HydraBase have Apache version or is it open source?</p>
  
  <p>Thanks!</p>