title: Cassandra nodes randomly going down
body: <p>I am running into problems with Cassandra 1.2.5 nodes going into high CPU usage 2300% and random becoming unresponsive (for example cannot log into cqlsh, getting timout exception).</p>
  
  <p>I am not sure why but  while running tpstats on that node i have 26000 pending ReadStage pool and FlushWriter 126 all time blocked. It seems that after restarting the node things come back to normal for a while and after period of time the problem reappears and I get timeouts all over the place and the data is not retrieved correctly from the table that were not  affected by the deployment.  </p>
  
  <p>I have deployed modification to the application prior to the problem identification where I introduced the table that receives heavy writes and after the data is read it is deleted. I wonder if the problem is due to compaction can anyone help???</p>