@Override
    public String getStoragePolicy() {
      return getStringOrDefault(STORAGE_POLICY_BYTES, Function.identity(), null);
    }
Set the replication factor to hfile(s) belonging to this family
@param replication number of replicas the blocks(s) belonging to this CF should have, or
                   {@link #DEFAULT_DFS_REPLICATION} for the default replication factor set in
                   the filesystem
@return this (for chained invocation)
hbase-client/src/main/java/org/apache/hadoop/hbase/client/ColumnFamilyDescriptorBuilder.java