title: Couchbase loses data after cluster node failure simulation
body: <p>I have 3 nodes in Couchbase cluster with number of replicas set to 1.</p>
  
  <p>While performing a multithreaded insert of 1M documents, I restart one of the nodes couple of times. </p>
  
  <p>The result is that at the end of insert operations, I am missing about 15% of the data.</p>
  
  <p>Any idea how to prevent the data loss?</p>