title: Should cassandra be used in reading before writing scenarios?
body: <p><a href="http://docs.datastax.com/en/cassandra/2.1/cassandra/planning/architecturePlanningAntiPatterns_c.html?scroll=archPlanAntiPattern__AntiPatRead" rel="nofollow">Reading before writing</a> paragraph from cassandra specification tells that read before write has a little impact on cassandra performance. But <a href="http://docs.datastax.com/en/cassandra/2.1/cassandra/dml/dml_manage_ondisk_c.html" rel="nofollow">storage engine</a> tells that cassandra itself avoid read before write scenarios.</p>
  
  <p>In my case I need to read row "see" on it and dependeing on conditions write it back. So in total cassandra is aproriate solution for such scenarios or not?</p>