private ICollection <ExtendedBlock> GetBlocksOnRack(IList <LocatedBlock> blks, string
rack)
{
ICollection <ExtendedBlock> ret = new HashSet <ExtendedBlock>();
foreach (LocatedBlock blk in blks)
{
foreach (DatanodeInfo di in blk.GetLocations())
{
if (rack.Equals(NetworkTopology.GetFirstHalf(di.GetNetworkLocation())))
{
ret.AddItem(blk.GetBlock());
break;
}
}
}
return(ret);
}
/// <exception cref="Org.Apache.Hadoop.Hdfs.Server.Blockmanagement.BlockPlacementPolicy.NotEnoughReplicasException
/// "/>
protected internal override DatanodeStorageInfo ChooseLocalRack(Node localMachine
, ICollection <Node> excludedNodes, long blocksize, int maxNodesPerRack, IList <DatanodeStorageInfo
> results, bool avoidStaleNodes, EnumMap <StorageType, int> storageTypes)
{
// 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
{
string scope = NetworkTopology.GetFirstHalf(localMachine.GetNetworkLocation());
return(ChooseRandom(scope, excludedNodes, blocksize, maxNodesPerRack, results, avoidStaleNodes
, storageTypes));
}
catch (BlockPlacementPolicy.NotEnoughReplicasException)
{
// find the second replica
DatanodeDescriptor newLocal = SecondNode(localMachine, results);
if (newLocal != null)
{
try
{
return(ChooseRandom(clusterMap.GetRack(newLocal.GetNetworkLocation()), excludedNodes
, blocksize, maxNodesPerRack, results, avoidStaleNodes, storageTypes));
}
catch (BlockPlacementPolicy.NotEnoughReplicasException)
{
//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));
}
}
}
/// <summary><inheritDoc/></summary>
/// <exception cref="Org.Apache.Hadoop.Hdfs.Server.Blockmanagement.BlockPlacementPolicy.NotEnoughReplicasException
/// "/>
protected internal override void ChooseRemoteRack(int numOfReplicas, DatanodeDescriptor
localMachine, ICollection <Node> excludedNodes, long blocksize, int maxReplicasPerRack
, IList <DatanodeStorageInfo> results, bool avoidStaleNodes, EnumMap <StorageType,
int> storageTypes)
{
int oldNumOfReplicas = results.Count;
string rackLocation = NetworkTopology.GetFirstHalf(localMachine.GetNetworkLocation
());
try
{
// randomly choose from remote racks
ChooseRandom(numOfReplicas, "~" + rackLocation, excludedNodes, blocksize, maxReplicasPerRack
, results, avoidStaleNodes, storageTypes);
}
catch (BlockPlacementPolicy.NotEnoughReplicasException)
{
// fall back to the local rack
ChooseRandom(numOfReplicas - (results.Count - oldNumOfReplicas), rackLocation, excludedNodes
, blocksize, maxReplicasPerRack, results, avoidStaleNodes, storageTypes);
}
}
protected internal override string GetRack(DatanodeInfo cur)
{
string nodeGroupString = cur.GetNetworkLocation();
return(NetworkTopology.GetFirstHalf(nodeGroupString));
}
