title: Cassandra Validation failed error - Repair session failed with error
body: <p>I'm running a Cassandra cluster with version 2.2.4. The cluster consists of 3 nodes.
  When I start repair using nodetool repair command i got the following error. and further it is not proceeding.</p>
  
  <pre><code>root@ems:/opt/apache-cassandra-2.2.4/bin# ./nodetool repair
  [2017-05-16 00:26:37,919] Starting repair command #47, repairing keyspace contexxio with repair options (parallelism: parallel, primary range: false, incremental: true, job threads: 1, ColumnFamilies: [], dataCenters: [], hosts: [], # of ranges: 768)
  [2017-05-16 00:26:39,571] Repair completed successfully
  [2017-05-16 00:26:39,574] Repair command #47 finished in 1 second
  [2017-05-16 00:26:39,606] Starting repair command #48, repairing keyspace watchtower_keyspace with repair options (parallelism: parallel, primary range: false, incremental: true, job threads: 1, ColumnFamilies: [], dataCenters: [], hosts: [], # of ranges: 509)
  [2017-05-16 00:26:40,555] Repair session dbbf6510-39ef-11e7-8027-d710f406f829 for range (-4631786651008530880,-4578496872070625882] failed with error [repair #dbbf6510-39ef-11e7-8027-d710f406f829 on watchtower_keyspace/release_stages, (-4631786651008530880,-4578496872070625882]] Validation failed in /10.128.133.99 (progress: 0%)
  </code></pre>
  
  <p>can any please one help me out of this .</p>