コード例 #1
0
ファイル: NameNode.java プロジェクト: ryane/hdfs
  public boolean evaluate(Offer offer) {
    boolean accept = false;

    if (dnsResolver.journalNodesResolvable()) {
      NodeConfig nameNodeConfig = config.getNodeConfig(HDFSConstants.NAME_NODE_ID);
      NodeConfig zkfcNodeConfig = config.getNodeConfig(HDFSConstants.ZKFC_NODE_ID);
      if (offerNotEnoughResources(
          offer,
          (nameNodeConfig.getCpus() + zkfcNodeConfig.getCpus()),
          (nameNodeConfig.getMaxHeap() + zkfcNodeConfig.getMaxHeap()))) {
        log.info("Offer does not have enough resources");
      } else {
        List<String> deadNameNodes = persistenceStore.getDeadNameNodes();

        if (deadNameNodes.isEmpty()) {
          if (persistenceStore.getNameNodes().size() == HDFSConstants.TOTAL_NAME_NODES) {
            log.info(String.format("Already running %s namenodes", HDFSConstants.TOTAL_NAME_NODES));
          } else if (persistenceStore.nameNodeRunningOnSlave(offer.getHostname())) {
            log.info(String.format("Already running namenode on %s", offer.getHostname()));
          } else if (persistenceStore.dataNodeRunningOnSlave(offer.getHostname())) {
            log.info(
                String.format("Cannot colocate namenode and datanode on %s", offer.getHostname()));
          } else if (!persistenceStore.journalNodeRunningOnSlave(offer.getHostname())) {
            log.info(
                String.format(
                    "We need to colocate the namenode with a journalnode and there is"
                        + "no journalnode running on this host. %s",
                    offer.getHostname()));
          } else {
            accept = true;
          }
        } else if (deadNameNodes.contains(offer.getHostname())) {
          accept = true;
        }
      }
    }

    return accept;
  }