Java Code Examples for org.apache.hadoop.net.NetworkTopology#getFirstHalf()

The following examples show how to use org.apache.hadoop.net.NetworkTopology#getFirstHalf() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: BlockPlacementPolicyWithNodeGroup.java    From hadoop with Apache License 2.0 6 votes vote down vote up 
/**
 * {@inheritDoc}
 */
@Override
protected void chooseRemoteRack(int numOfReplicas,
    DatanodeDescriptor localMachine, Set<Node> excludedNodes,
    long blocksize, int maxReplicasPerRack, List<DatanodeStorageInfo> results,
    boolean avoidStaleNodes, EnumMap<StorageType, Integer> storageTypes)
    throws NotEnoughReplicasException {
  int oldNumOfReplicas = results.size();

  final String rackLocation = NetworkTopology.getFirstHalf(
      localMachine.getNetworkLocation());
  try {
    // randomly choose from remote racks
    chooseRandom(numOfReplicas, "~" + rackLocation, excludedNodes, blocksize,
        maxReplicasPerRack, results, avoidStaleNodes, storageTypes);
  } catch (NotEnoughReplicasException e) {
    // fall back to the local rack
    chooseRandom(numOfReplicas - (results.size() - oldNumOfReplicas),
        rackLocation, excludedNodes, blocksize,
        maxReplicasPerRack, results, avoidStaleNodes, storageTypes);
  }
}
Example 2
Source File: BlockPlacementPolicyWithNodeGroup.java    From big-c with Apache License 2.0 6 votes vote down vote up 
/**
 * {@inheritDoc}
 */
@Override
protected void chooseRemoteRack(int numOfReplicas,
    DatanodeDescriptor localMachine, Set<Node> excludedNodes,
    long blocksize, int maxReplicasPerRack, List<DatanodeStorageInfo> results,
    boolean avoidStaleNodes, EnumMap<StorageType, Integer> storageTypes)
    throws NotEnoughReplicasException {
  int oldNumOfReplicas = results.size();

  final String rackLocation = NetworkTopology.getFirstHalf(
      localMachine.getNetworkLocation());
  try {
    // randomly choose from remote racks
    chooseRandom(numOfReplicas, "~" + rackLocation, excludedNodes, blocksize,
        maxReplicasPerRack, results, avoidStaleNodes, storageTypes);
  } catch (NotEnoughReplicasException e) {
    // fall back to the local rack
    chooseRandom(numOfReplicas - (results.size() - oldNumOfReplicas),
        rackLocation, excludedNodes, blocksize,
        maxReplicasPerRack, results, avoidStaleNodes, storageTypes);
  }
}
Example 3
Source File: BlockPlacementPolicyWithNodeGroup.java    From hadoop with Apache License 2.0 5 votes vote down vote up 
@Override
protected DatanodeStorageInfo chooseLocalRack(Node localMachine,
    Set<Node> excludedNodes, long blocksize, int maxNodesPerRack,
    List<DatanodeStorageInfo> results, boolean avoidStaleNodes,
    EnumMap<StorageType, Integer> storageTypes) throws
    NotEnoughReplicasException {
  // no local machine, so choose a random machine
  if (localMachine == null) {
    return chooseRandom(NodeBase.ROOT, excludedNodes, blocksize,
        maxNodesPerRack, results, avoidStaleNodes, storageTypes);
  }

  // choose one from the local rack, but off-nodegroup
  try {
    final String scope = NetworkTopology.getFirstHalf(localMachine.getNetworkLocation());
    return chooseRandom(scope, excludedNodes, blocksize, maxNodesPerRack,
        results, avoidStaleNodes, storageTypes);
  } catch (NotEnoughReplicasException e1) {
    // find the second replica
    final DatanodeDescriptor newLocal = secondNode(localMachine, results);
    if (newLocal != null) {
      try {
        return chooseRandom(
            clusterMap.getRack(newLocal.getNetworkLocation()), excludedNodes,
            blocksize, maxNodesPerRack, results, avoidStaleNodes,
            storageTypes);
      } catch(NotEnoughReplicasException e2) {
        //otherwise randomly choose one from the network
        return chooseRandom(NodeBase.ROOT, excludedNodes, blocksize,
            maxNodesPerRack, results, avoidStaleNodes, storageTypes);
      }
    } else {
      //otherwise randomly choose one from the network
      return chooseRandom(NodeBase.ROOT, excludedNodes, blocksize,
          maxNodesPerRack, results, avoidStaleNodes, storageTypes);
    }
  }
}
Example 4
Source File: BlockPlacementPolicyWithNodeGroup.java    From big-c with Apache License 2.0 5 votes vote down vote up 
@Override
protected DatanodeStorageInfo chooseLocalRack(Node localMachine,
    Set<Node> excludedNodes, long blocksize, int maxNodesPerRack,
    List<DatanodeStorageInfo> results, boolean avoidStaleNodes,
    EnumMap<StorageType, Integer> storageTypes) throws
    NotEnoughReplicasException {
  // no local machine, so choose a random machine
  if (localMachine == null) {
    return chooseRandom(NodeBase.ROOT, excludedNodes, blocksize,
        maxNodesPerRack, results, avoidStaleNodes, storageTypes);
  }

  // choose one from the local rack, but off-nodegroup
  try {
    final String scope = NetworkTopology.getFirstHalf(localMachine.getNetworkLocation());
    return chooseRandom(scope, excludedNodes, blocksize, maxNodesPerRack,
        results, avoidStaleNodes, storageTypes);
  } catch (NotEnoughReplicasException e1) {
    // find the second replica
    final DatanodeDescriptor newLocal = secondNode(localMachine, results);
    if (newLocal != null) {
      try {
        return chooseRandom(
            clusterMap.getRack(newLocal.getNetworkLocation()), excludedNodes,
            blocksize, maxNodesPerRack, results, avoidStaleNodes,
            storageTypes);
      } catch(NotEnoughReplicasException e2) {
        //otherwise randomly choose one from the network
        return chooseRandom(NodeBase.ROOT, excludedNodes, blocksize,
            maxNodesPerRack, results, avoidStaleNodes, storageTypes);
      }
    } else {
      //otherwise randomly choose one from the network
      return chooseRandom(NodeBase.ROOT, excludedNodes, blocksize,
          maxNodesPerRack, results, avoidStaleNodes, storageTypes);
    }
  }
}
Example 5
Source File: BlockPlacementPolicyWithNodeGroup.java    From hadoop with Apache License 2.0 4 votes vote down vote up 
@Override
protected String getRack(final DatanodeInfo cur) {
  String nodeGroupString = cur.getNetworkLocation();
  return NetworkTopology.getFirstHalf(nodeGroupString);
}
Example 6
Source File: BlockPlacementPolicyWithNodeGroup.java    From big-c with Apache License 2.0 4 votes vote down vote up 
@Override
protected String getRack(final DatanodeInfo cur) {
  String nodeGroupString = cur.getNetworkLocation();
  return NetworkTopology.getFirstHalf(nodeGroupString);
}