static void setStaticMapping(LoggedNetworkTopology topology) {
for (LoggedNetworkTopology rack : topology.getChildren()) {
for (LoggedNetworkTopology node : rack.getChildren()) {
StaticMapping.addNodeToRack(node.getName(), new RackNode(rack.getName(), 1).getName());
}
}
}
/** Start the tasktracker. */
public void startTaskTracker(String host, String rack, int idx, int numDir) throws IOException {
if (rack != null) {
StaticMapping.addNodeToRack(host, rack);
}
if (host != null) {
NetUtils.addStaticResolution(host, "localhost");
}
TaskTrackerRunner taskTracker;
taskTracker = new TaskTrackerRunner(idx, numDir, host, conf);
addTaskTracker(taskTracker);
}
private void startDataNodes() throws IOException {
if (racks != null && numDataNodes > racks.length) {
throw new IllegalArgumentException(
"The length of racks ["
+ racks.length
+ "] is less than the number "
+ "of datanodes ["
+ numDataNodes
+ "].");
}
if (hosts != null && numDataNodes > hosts.length) {
throw new IllegalArgumentException(
"The length of hosts ["
+ hosts.length
+ "] is less than the number "
+ "of datanodes ["
+ numDataNodes
+ "].");
}
// Generate some hostnames if required
if (racks != null && hosts == null) {
LOG.info("Generating host names for datanodes");
hosts = new String[numDataNodes];
for (int i = 0; i < numDataNodes; i++) {
hosts[i] = "host" + i + ".foo.com";
}
}
String[] dnArgs = {HdfsConstants.StartupOption.REGULAR.getName()};
for (int i = 0; i < numDataNodes; i++) {
Configuration dnConf = new Configuration(conf);
File dir1 = new File(dataDir, "data" + (2 * i + 1));
File dir2 = new File(dataDir, "data" + (2 * i + 2));
dir1.mkdirs();
dir2.mkdirs();
if (!dir1.isDirectory() || !dir2.isDirectory()) {
throw new IOException(
"Mkdirs failed to create directory for DataNode " + i + ": " + dir1 + " or " + dir2);
}
dnConf.set("dfs.data.dir", dir1.getPath() + "," + dir2.getPath());
LOG.info("Starting DataNode " + i + " with dfs.data.dir: " + dnConf.get("dfs.data.dir"));
if (hosts != null) {
dnConf.set("slave.host.name", hosts[i]);
LOG.info(
"Starting DataNode " + i + " with hostname set to: " + dnConf.get("slave.host.name"));
}
if (racks != null) {
String name = hosts[i];
LOG.info("Adding node with hostname : " + name + " to rack " + racks[i]);
StaticMapping.addNodeToRack(name, racks[i]);
}
Configuration newconf = new Configuration(dnConf); // save config
if (hosts != null) {
NetUtils.addStaticResolution(hosts[i], "localhost");
}
AvatarDataNode dn = AvatarDataNode.instantiateDataNode(dnArgs, dnConf);
// since the HDFS does things based on IP:port, we need to add the mapping
// for IP:port to rackId
String ipAddr = dn.getSelfAddr().getAddress().getHostAddress();
if (racks != null) {
int port = dn.getSelfAddr().getPort();
System.out.println(
"Adding node with IP:port : " + ipAddr + ":" + port + " to rack " + racks[i]);
StaticMapping.addNodeToRack(ipAddr + ":" + port, racks[i]);
}
dn.runDatanodeDaemon();
dataNodes.add(new DataNodeProperties(dn, newconf, dnArgs));
}
}