类 org.apache.hadoop.net.NetworkTopology
的使用

使用NetworkTopology的程序包

程序包	说明
org.apache.hadoop.hdfs.server.namenode
org.apache.hadoop.mapred	A software framework for easily writing applications which process vast amounts of data (multi-terabyte data-sets) parallelly on large clusters (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant manner.
org.apache.hadoop.net	Network-related classes.

org.apache.hadoop.hdfs.server.namenode中NetworkTopology的使用

声明为NetworkTopology的org.apache.hadoop.hdfs.server.namenode中的字段

限定符和类型	字段和说明
protected NetworkTopology	BlockPlacementPolicyDefault.clusterMap

参数类型为NetworkTopology的org.apache.hadoop.hdfs.server.namenode中的方法

限定符和类型	方法和说明
static BlockPlacementPolicy	BlockPlacementPolicy.getInstance(Configuration conf, FSClusterStats stats, NetworkTopology clusterMap) Get an instance of the configured Block Placement Policy based on the value of the configuration paramater dfs.block.replicator.classname.
void	BlockPlacementPolicyWithNodeGroup.initialize(Configuration conf, FSClusterStats stats, NetworkTopology clusterMap)
void	BlockPlacementPolicyDefault.initialize(Configuration conf, FSClusterStats stats, NetworkTopology clusterMap) Used to setup a BlockPlacementPolicy object.
protected abstract void	BlockPlacementPolicy.initialize(Configuration conf, FSClusterStats stats, NetworkTopology clusterMap) Used to setup a BlockPlacementPolicy object.

org.apache.hadoop.mapred中NetworkTopology的使用

参数类型为NetworkTopology的org.apache.hadoop.mapred中的方法

限定符和类型	方法和说明
protected String[]	FileInputFormat.getSplitHosts(BlockLocation[] blkLocations, long offset, long splitSize, NetworkTopology clusterMap) This function identifies and returns the hosts that contribute most for a given split.

org.apache.hadoop.net中NetworkTopology的使用

org.apache.hadoop.net中NetworkTopology的子类

限定符和类型	类和说明
class	NetworkTopologyWithNodeGroup The class extends NetworkTopology to represents a cluster of computer with a 4-layers hierarchical network topology.

返回NetworkTopology的org.apache.hadoop.net中的方法

限定符和类型	方法和说明
static NetworkTopology	NetworkTopology.getInstance(Configuration conf) Get an instance of NetworkTopology based on the value of the configuration parameter net.topology.impl.