code: @Override
      public void release() throws Exception {
          if (!locksToDelete.isEmpty() || lockColumn != null) {
              MutationBatch m = keyspace.prepareMutationBatch().setConsistencyLevel(consistencyLevel);
              fillReleaseMutation(m, false);
              m.execute();
          }
      }
docs: Release the lock by releasing this and any other stale lock columns