title: High CPU Usage in Cassandra 2.0
body: <p>Running a 4 node cluster cassandra version 2.0.9. Recently since a
  month we are seeing a huge spike in the CPU usage on all the nodes.</p>
  
  <p><a href="https://i.stack.imgur.com/AyoQa.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AyoQa.png" alt="Node status"></a></p>
  
  <p>tpstats gives me high Native-transport-requests. Attaching screenshot
  for 3 nodes tpstats</p>
  
  <p>Node 1
  <a href="https://i.stack.imgur.com/iRgvD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iRgvD.png" alt="Node status"></a>
  Node 2
  <a href="https://i.stack.imgur.com/l8q7B.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/l8q7B.png" alt="Node status"></a>
  Node 3
  <a href="https://i.stack.imgur.com/dA8iO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dA8iO.png" alt="Node status"></a></p>
  
  <p>From where should I start debugging?</p>
  
  <p>Also if you see from first picture when the load becomes high the read
  and write becomes low . This is understandable as the majority of the
  requests drop</p>