code: private MutationStatus incrCoords(KeySpec ks) {
          final StorageVBucketCoordinates curCoord;
          synchronized (vbCoords) {
              curCoord = vbCoords[ks.vbId];
          }
  
          long seq = curCoord.incrSeqno();
          long uuid = curCoord.getUuid();
          VBucketCoordinates coord = new BasicVBucketCoordinates(uuid, seq);
          return new MutationStatus(coord);
      }
docs: Increments the current coordinates for a new mutation.
  @param ks The key spec containing the vBucket ID whose coordinates should be increases
  @return A status object.