code: public void initialize(Configuration conf,
                           FSClusterStats stats,
                           NetworkTopology clusterMap,
                           HostsFileReader hostsReader,
                           DNSToSwitchMapping dnsToSwitchMapping,
                           FSNamesystem ns) {
      super.initialize(
        conf, stats, clusterMap, hostsReader, dnsToSwitchMapping, ns);
      this.namesystem = ns;
      // Default
      this.stripeLen = 0;
      this.considerLoad = conf.getBoolean("dfs.replication.considerLoad", true);
      FSNamesystem.LOG.info("F4: Block placement will consider load: "
        + this.considerLoad);
      initParityConfigs();
      this.stagingDir = conf.get("dfs.f4.staging", "/staging");
      this.localDir = conf.get("dfs.f4.local", "/local");
    }
docs: {@inheritDoc}