title: Is "nodetool scrub" and "sstablescrub" safe to run on cassandra node?
body: <p>I was trying to run nodetool repair on cassandra node in production environment and this was not successfull, It was giving below error</p>
  
  <p>**Validation failed in /10.253.189.222 (progress: 0%)</p>
  
  <p>DEBUG [ReadRepairStage:99093] 2018-11-22 06:29:35,411 ReadCallback.java:234 - Digest mismatch:
  org.apache.cassandra.service.DigestMismatchException: Mismatch for key DecoratedKey(5889678124560878183, 74e024839ef04bc1b14122ac99255dd6) (74aa9a679d7ddfa104c0666f277714b6 vs 9c7fadd13350462813b6ebdb035e2e9d)
                  at org.apache.cassandra.service.DigestResolver.resolve(DigestResolver.java:85) ~[apache-cassandra-3.0.9.jar:3.0.9]
                  at org.apache.cassandra.service.ReadCallback$AsyncRepairRunner.run(ReadCallback.java:225) ~[apache-cassandra-3.0.9.jar:3.0.9]
                  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131]
                  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131]
                  at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]**</p>
  
  <p>Is it safe to run "nodetool scrub" and "sstablescrub"? Will there be any data loss? Please suggest.</p>