public virtual void SetUp()
{
FileSystem.SetDefaultUri(Conf, "hdfs://localhost:0");
Conf.Set(DFSConfigKeys.DfsNamenodeHttpAddressKey, "0.0.0.0:0");
// Set properties to make HDFS aware of NodeGroup.
Conf.Set(DFSConfigKeys.DfsBlockReplicatorClassnameKey, typeof(BlockPlacementPolicyWithNodeGroup
).FullName);
Conf.Set(CommonConfigurationKeysPublic.NetTopologyImplKey, typeof(NetworkTopologyWithNodeGroup
).FullName);
Conf.SetBoolean(DFSConfigKeys.DfsNamenodeAvoidStaleDatanodeForWriteKey, true);
FilePath baseDir = PathUtils.GetTestDir(typeof(TestReplicationPolicyWithNodeGroup
));
Conf.Set(DFSConfigKeys.DfsNamenodeNameDirKey, new FilePath(baseDir, "name").GetPath
());
DFSTestUtil.FormatNameNode(Conf);
namenode = new NameNode(Conf);
BlockManager bm = namenode.GetNamesystem().GetBlockManager();
replicator = bm.GetBlockPlacementPolicy();
cluster = bm.GetDatanodeManager().GetNetworkTopology();
// construct network topology
for (int i = 0; i < NumOfDatanodes; i++)
{
cluster.Add(dataNodes[i]);
}
SetupDataNodeCapacity();
}
/// <summary>
/// Change whether the block placement policy will prefer the writer's
/// local Datanode or not.
/// </summary>
/// <param name="prefer">if true, prefer local node</param>
public static void SetWritingPrefersLocalNode(BlockManager bm, bool prefer)
{
BlockPlacementPolicy bpp = bm.GetBlockPlacementPolicy();
Preconditions.CheckState(bpp is BlockPlacementPolicyDefault, "Must use default policy, got %s"
, bpp.GetType());
((BlockPlacementPolicyDefault)bpp).SetPreferLocalNode(prefer);
}
/// <summary>
/// Get an instance of the configured Block Placement Policy based on the
/// the configuration property
/// <see cref="Org.Apache.Hadoop.Hdfs.DFSConfigKeys.DfsBlockReplicatorClassnameKey"/>
/// .
/// </summary>
/// <param name="conf">the configuration to be used</param>
/// <param name="stats">an object that is used to retrieve the load on the cluster</param>
/// <param name="clusterMap">the network topology of the cluster</param>
/// <returns>an instance of BlockPlacementPolicy</returns>
public static BlockPlacementPolicy GetInstance(Configuration conf, FSClusterStats
stats, NetworkTopology clusterMap, Host2NodesMap host2datanodeMap)
{
Type replicatorClass = conf.GetClass <BlockPlacementPolicy>(DFSConfigKeys.DfsBlockReplicatorClassnameKey
, DFSConfigKeys.DfsBlockReplicatorClassnameDefault);
BlockPlacementPolicy replicator = ReflectionUtils.NewInstance(replicatorClass, conf
);
replicator.Initialize(conf, stats, clusterMap, host2datanodeMap);
return(replicator);
}