/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs;
import java.io.File;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.nio.channels.FileChannel;
import java.util.Random;
import java.io.RandomAccessFile;
import javax.security.auth.login.LoginException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.net.*;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.FSConstants.DatanodeReportType;
import org.apache.hadoop.hdfs.server.common.HdfsConstants.StartupOption;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.FSDatasetInterface;
import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.tools.DFSAdmin;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.security.*;
import org.apache.hadoop.util.ToolRunner;
/**
* This class creates a single-process DFS cluster for junit testing.
* The data directories for non-simulated DFS are under the testing directory.
* For simulated data nodes, no underlying fs storage is used.
*/
public class MiniDFSCluster {
public class DataNodeProperties {
DataNode datanode;
Configuration conf;
String[] dnArgs;
DataNodeProperties(DataNode node, Configuration conf, String[] args) {
this.datanode = node;
this.conf = conf;
this.dnArgs = args;
}
}
private Configuration conf;
private NameNode nameNode;
private int numDataNodes;
private ArrayList<DataNodeProperties> dataNodes =
new ArrayList<DataNodeProperties>();
private File base_dir;
private File data_dir;
/**
* This null constructor is used only when wishing to start a data node cluster
* without a name node (ie when the name node is started elsewhere).
*/
public MiniDFSCluster() {
}
/**
* Modify the config and start up the servers with the given operation.
* Servers will be started on free ports.
* <p>
* The caller must manage the creation of NameNode and DataNode directories
* and have already set dfs.name.dir and dfs.data.dir in the given conf.
*
* @param conf the base configuration to use in starting the servers. This
* will be modified as necessary.
* @param numDataNodes Number of DataNodes to start; may be zero
* @param nameNodeOperation the operation with which to start the servers. If null
* or StartupOption.FORMAT, then StartupOption.REGULAR will be used.
*/
public MiniDFSCluster(Configuration conf,
int numDataNodes,
StartupOption nameNodeOperation) throws IOException {
this(0, conf, numDataNodes, false, false, false, nameNodeOperation,
null, null, null);
}
/**
* Modify the config and start up the servers. The rpc and info ports for
* servers are guaranteed to use free ports.
* <p>
* NameNode and DataNode directory creation and configuration will be
* managed by this class.
*
* @param conf the base configuration to use in starting the servers. This
* will be modified as necessary.
* @param numDataNodes Number of DataNodes to start; may be zero
* @param format if true, format the NameNode and DataNodes before starting up
* @param racks array of strings indicating the rack that each DataNode is on
*/
public MiniDFSCluster(Configuration conf,
int numDataNodes,
boolean format,
String[] racks) throws IOException {
this(0, conf, numDataNodes, format, true, true, null, racks, null, null);
}
/**
* Modify the config and start up the servers. The rpc and info ports for
* servers are guaranteed to use free ports.
* <p>
* NameNode and DataNode directory creation and configuration will be
* managed by this class.
*
* @param conf the base configuration to use in starting the servers. This
* will be modified as necessary.
* @param numDataNodes Number of DataNodes to start; may be zero
* @param format if true, format the NameNode and DataNodes before starting up
* @param racks array of strings indicating the rack that each DataNode is on
* @param hosts array of strings indicating the hostname for each DataNode
*/
public MiniDFSCluster(Configuration conf,
int numDataNodes,
boolean format,
String[] racks, String[] hosts) throws IOException {
this(0, conf, numDataNodes, format, true, true, null, racks, hosts, null);
}
/**
* NOTE: if possible, the other constructors that don't have nameNode port
* parameter should be used as they will ensure that the servers use free ports.
* <p>
* Modify the config and start up the servers.
*
* @param nameNodePort suggestion for which rpc port to use. caller should
* use getNameNodePort() to get the actual port used.
* @param conf the base configuration to use in starting the servers. This
* will be modified as necessary.
* @param numDataNodes Number of DataNodes to start; may be zero
* @param format if true, format the NameNode and DataNodes before starting up
* @param manageDfsDirs if true, the data directories for servers will be
* created and dfs.name.dir and dfs.data.dir will be set in the conf
* @param operation the operation with which to start the servers. If null
* or StartupOption.FORMAT, then StartupOption.REGULAR will be used.
* @param racks array of strings indicating the rack that each DataNode is on
*/
public MiniDFSCluster(int nameNodePort,
Configuration conf,
int numDataNodes,
boolean format,
boolean manageDfsDirs,
StartupOption operation,
String[] racks) throws IOException {
this(nameNodePort, conf, numDataNodes, format, manageDfsDirs, manageDfsDirs,
operation, racks, null, null);
}
/**
* NOTE: if possible, the other constructors that don't have nameNode port
* parameter should be used as they will ensure that the servers use free ports.
* <p>
* Modify the config and start up the servers.
*
* @param nameNodePort suggestion for which rpc port to use. caller should
* use getNameNodePort() to get the actual port used.
* @param conf the base configuration to use in starting the servers. This
* will be modified as necessary.
* @param numDataNodes Number of DataNodes to start; may be zero
* @param format if true, format the NameNode and DataNodes before starting up
* @param manageDfsDirs if true, the data directories for servers will be
* created and dfs.name.dir and dfs.data.dir will be set in the conf
* @param operation the operation with which to start the servers. If null
* or StartupOption.FORMAT, then StartupOption.REGULAR will be used.
* @param racks array of strings indicating the rack that each DataNode is on
* @param simulatedCapacities array of capacities of the simulated data nodes
*/
public MiniDFSCluster(int nameNodePort,
Configuration conf,
int numDataNodes,
boolean format,
boolean manageDfsDirs,
StartupOption operation,
String[] racks,
long[] simulatedCapacities) throws IOException {
this(nameNodePort, conf, numDataNodes, format, manageDfsDirs, manageDfsDirs,
operation, racks, null, simulatedCapacities);
}
/**
* NOTE: if possible, the other constructors that don't have nameNode port
* parameter should be used as they will ensure that the servers use free ports.
* <p>
* Modify the config and start up the servers.
*
* @param nameNodePort suggestion for which rpc port to use. caller should
* use getNameNodePort() to get the actual port used.
* @param conf the base configuration to use in starting the servers. This
* will be modified as necessary.
* @param numDataNodes Number of DataNodes to start; may be zero
* @param format if true, format the NameNode and DataNodes before starting up
* @param manageNameDfsDirs if true, the data directories for servers will be
* created and dfs.name.dir and dfs.data.dir will be set in the conf
* @param manageDataDfsDirs if true, the data directories for datanodes will
* be created and dfs.data.dir set to same in the conf
* @param operation the operation with which to start the servers. If null
* or StartupOption.FORMAT, then StartupOption.REGULAR will be used.
* @param racks array of strings indicating the rack that each DataNode is on
* @param hosts array of strings indicating the hostnames of each DataNode
* @param simulatedCapacities array of capacities of the simulated data nodes
*/
public MiniDFSCluster(int nameNodePort,
Configuration conf,
int numDataNodes,
boolean format,
boolean manageNameDfsDirs,
boolean manageDataDfsDirs,
StartupOption operation,
String[] racks, String hosts[],
long[] simulatedCapacities) throws IOException {
this.conf = conf;
try {
UserGroupInformation.setCurrentUser(UnixUserGroupInformation.login(conf));
} catch (LoginException e) {
IOException ioe = new IOException();
ioe.initCause(e);
throw ioe;
}
base_dir = new File(System.getProperty("test.build.data", "build/test/data"), "dfs/");
data_dir = new File(base_dir, "data");
// Setup the NameNode configuration
FileSystem.setDefaultUri(conf, "hdfs://localhost:"+ Integer.toString(nameNodePort));
conf.set("dfs.http.address", "127.0.0.1:0");
if (manageNameDfsDirs) {
conf.set("dfs.name.dir", new File(base_dir, "name1").getPath()+","+
new File(base_dir, "name2").getPath());
conf.set("fs.checkpoint.dir", new File(base_dir, "namesecondary1").
getPath()+"," + new File(base_dir, "namesecondary2").getPath());
}
int replication = conf.getInt("dfs.replication", 3);
conf.setInt("dfs.replication", Math.min(replication, numDataNodes));
conf.setInt("dfs.safemode.extension", 0);
conf.setInt("dfs.namenode.decommission.interval", 3); // 3 second
// Format and clean out DataNode directories
if (format) {
if (data_dir.exists() && !FileUtil.fullyDelete(data_dir)) {
throw new IOException("Cannot remove data directory: " + data_dir);
}
NameNode.format(conf);
}
// Start the NameNode
String[] args = (operation == null ||
operation == StartupOption.FORMAT ||
operation == StartupOption.REGULAR) ?
new String[] {} : new String[] {operation.getName()};
conf.setClass("topology.node.switch.mapping.impl",
StaticMapping.class, DNSToSwitchMapping.class);
nameNode = NameNode.createNameNode(args, conf);
// Start the DataNodes
startDataNodes(conf, numDataNodes, manageDataDfsDirs,
operation, racks, hosts, simulatedCapacities);
waitClusterUp();
}
/**
* wait for the cluster to get out of
* safemode.
*/
public void waitClusterUp() {
if (numDataNodes > 0) {
while (!isClusterUp()) {
try {
System.err.println("Waiting for the Mini HDFS Cluster to start...");
Thread.sleep(1000);
} catch (InterruptedException e) {
}
}
}
}
/**
* Modify the config and start up additional DataNodes. The info port for
* DataNodes is guaranteed to use a free port.
*
* Data nodes can run with the name node in the mini cluster or
* a real name node. For example, running with a real name node is useful
* when running simulated data nodes with a real name node.
* If minicluster's name node is null assume that the conf has been
* set with the right address:port of the name node.
*
* @param conf the base configuration to use in starting the DataNodes. This
* will be modified as necessary.
* @param numDataNodes Number of DataNodes to start; may be zero
* @param manageDfsDirs if true, the data directories for DataNodes will be
* created and dfs.data.dir will be set in the conf
* @param operation the operation with which to start the DataNodes. If null
* or StartupOption.FORMAT, then StartupOption.REGULAR will be used.
* @param racks array of strings indicating the rack that each DataNode is on
* @param hosts array of strings indicating the hostnames for each DataNode
* @param simulatedCapacities array of capacities of the simulated data nodes
*
* @throws IllegalStateException if NameNode has been shutdown
*/
public synchronized void startDataNodes(Configuration conf, int numDataNodes,
boolean manageDfsDirs, StartupOption operation,
String[] racks, String[] hosts,
long[] simulatedCapacities) throws IOException {
int curDatanodesNum = dataNodes.size();
// for mincluster's the default initialDelay for BRs is 0
if (conf.get("dfs.blockreport.initialDelay") == null) {
conf.setLong("dfs.blockreport.initialDelay", 0);
}
// If minicluster's name node is null assume that the conf has been
// set with the right address:port of the name node.
//
if (nameNode != null) { // set conf from the name node
InetSocketAddress nnAddr = nameNode.getNameNodeAddress();
int nameNodePort = nnAddr.getPort();
FileSystem.setDefaultUri(conf,
"hdfs://"+ nnAddr.getHostName() +
":" + Integer.toString(nameNodePort));
}
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) {
System.out.println("Generating host names for datanodes");
hosts = new String[numDataNodes];
for (int i = curDatanodesNum; i < curDatanodesNum + numDataNodes; i++) {
hosts[i - curDatanodesNum] = "host" + i + ".foo.com";
}
}
if (simulatedCapacities != null
&& numDataNodes > simulatedCapacities.length) {
throw new IllegalArgumentException( "The length of simulatedCapacities ["
+ simulatedCapacities.length
+ "] is less than the number of datanodes [" + numDataNodes + "].");
}
// Set up the right ports for the datanodes
conf.set("dfs.datanode.address", "127.0.0.1:0");
conf.set("dfs.datanode.http.address", "127.0.0.1:0");
conf.set("dfs.datanode.ipc.address", "127.0.0.1:0");
String [] dnArgs = (operation == null ||
operation != StartupOption.ROLLBACK) ?
null : new String[] {operation.getName()};
for (int i = curDatanodesNum; i < curDatanodesNum+numDataNodes; i++) {
Configuration dnConf = new Configuration(conf);
if (manageDfsDirs) {
File dir1 = new File(data_dir, "data"+(2*i+1));
File dir2 = new File(data_dir, "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());
}
if (simulatedCapacities != null) {
dnConf.setBoolean("dfs.datanode.simulateddatastorage", true);
dnConf.setLong(SimulatedFSDataset.CONFIG_PROPERTY_CAPACITY,
simulatedCapacities[i-curDatanodesNum]);
}
System.out.println("Starting DataNode " + i + " with dfs.data.dir: "
+ dnConf.get("dfs.data.dir"));
if (hosts != null) {
dnConf.set("slave.host.name", hosts[i - curDatanodesNum]);
System.out.println("Starting DataNode " + i + " with hostname set to: "
+ dnConf.get("slave.host.name"));
}
if (racks != null) {
String name = hosts[i - curDatanodesNum];
System.out.println("Adding node with hostname : " + name + " to rack "+
racks[i-curDatanodesNum]);
StaticMapping.addNodeToRack(name,
racks[i-curDatanodesNum]);
}
Configuration newconf = new Configuration(dnConf); // save config
if (hosts != null) {
NetUtils.addStaticResolution(hosts[i - curDatanodesNum], "localhost");
}
DataNode dn = DataNode.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-curDatanodesNum]);
StaticMapping.addNodeToRack(ipAddr + ":" + port,
racks[i-curDatanodesNum]);
}
DataNode.runDatanodeDaemon(dn);
dataNodes.add(new DataNodeProperties(dn, newconf, dnArgs));
}
curDatanodesNum += numDataNodes;
this.numDataNodes += numDataNodes;
waitActive();
}
/**
* Modify the config and start up the DataNodes. The info port for
* DataNodes is guaranteed to use a free port.
*
* @param conf the base configuration to use in starting the DataNodes. This
* will be modified as necessary.
* @param numDataNodes Number of DataNodes to start; may be zero
* @param manageDfsDirs if true, the data directories for DataNodes will be
* created and dfs.data.dir will be set in the conf
* @param operation the operation with which to start the DataNodes. If null
* or StartupOption.FORMAT, then StartupOption.REGULAR will be used.
* @param racks array of strings indicating the rack that each DataNode is on
*
* @throws IllegalStateException if NameNode has been shutdown
*/
public void startDataNodes(Configuration conf, int numDataNodes,
boolean manageDfsDirs, StartupOption operation,
String[] racks
) throws IOException {
startDataNodes( conf, numDataNodes, manageDfsDirs, operation, racks, null, null);
}
/**
* Modify the config and start up additional DataNodes. The info port for
* DataNodes is guaranteed to use a free port.
*
* Data nodes can run with the name node in the mini cluster or
* a real name node. For example, running with a real name node is useful
* when running simulated data nodes with a real name node.
* If minicluster's name node is null assume that the conf has been
* set with the right address:port of the name node.
*
* @param conf the base configuration to use in starting the DataNodes. This
* will be modified as necessary.
* @param numDataNodes Number of DataNodes to start; may be zero
* @param manageDfsDirs if true, the data directories for DataNodes will be
* created and dfs.data.dir will be set in the conf
* @param operation the operation with which to start the DataNodes. If null
* or StartupOption.FORMAT, then StartupOption.REGULAR will be used.
* @param racks array of strings indicating the rack that each DataNode is on
* @param simulatedCapacities array of capacities of the simulated data nodes
*
* @throws IllegalStateException if NameNode has been shutdown
*/
public void startDataNodes(Configuration conf, int numDataNodes,
boolean manageDfsDirs, StartupOption operation,
String[] racks,
long[] simulatedCapacities) throws IOException {
startDataNodes(conf, numDataNodes, manageDfsDirs, operation, racks, null,
simulatedCapacities);
}
/**
* If the NameNode is running, attempt to finalize a previous upgrade.
* When this method return, the NameNode should be finalized, but
* DataNodes may not be since that occurs asynchronously.
*
* @throws IllegalStateException if the Namenode is not running.
*/
public void finalizeCluster(Configuration conf) throws Exception {
if (nameNode == null) {
throw new IllegalStateException("Attempting to finalize "
+ "Namenode but it is not running");
}
ToolRunner.run(new DFSAdmin(conf), new String[] {"-finalizeUpgrade"});
}
/**
* Gets the started NameNode. May be null.
*/
public NameNode getNameNode() {
return nameNode;
}
/**
* Gets a list of the started DataNodes. May be empty.
*/
public ArrayList<DataNode> getDataNodes() {
ArrayList<DataNode> list = new ArrayList<DataNode>();
for (int i = 0; i < dataNodes.size(); i++) {
DataNode node = dataNodes.get(i).datanode;
list.add(node);
}
return list;
}
/** @return the datanode having the ipc server listen port */
public DataNode getDataNode(int ipcPort) {
for(DataNode dn : getDataNodes()) {
if (dn.ipcServer.getListenerAddress().getPort() == ipcPort) {
return dn;
}
}
return null;
}
/**
* Gets the rpc port used by the NameNode, because the caller
* supplied port is not necessarily the actual port used.
*/
public int getNameNodePort() {
return nameNode.getNameNodeAddress().getPort();
}
/**
* Shut down the servers that are up.
*/
public void shutdown() {
System.out.println("Shutting down the Mini HDFS Cluster");
shutdownDataNodes();
if (nameNode != null) {
nameNode.stop();
nameNode.join();
nameNode = null;
}
}
/**
* Shutdown all DataNodes started by this class. The NameNode
* is left running so that new DataNodes may be started.
*/
public void shutdownDataNodes() {
for (int i = dataNodes.size()-1; i >= 0; i--) {
System.out.println("Shutting down DataNode " + i);
DataNode dn = dataNodes.remove(i).datanode;
dn.shutdown();
numDataNodes--;
}
}
/*
* Corrupt a block on all datanode
*/
void corruptBlockOnDataNodes(String blockName) throws Exception{
for (int i=0; i < dataNodes.size(); i++)
corruptBlockOnDataNode(i,blockName);
}
/*
* Corrupt a block on a particular datanode
*/
boolean corruptBlockOnDataNode(int i, String blockName) throws Exception {
Random random = new Random();
boolean corrupted = false;
File dataDir = new File(System.getProperty("test.build.data", "build/test/data"), "dfs/data");
if (i < 0 || i >= dataNodes.size())
return false;
for (int dn = i*2; dn < i*2+2; dn++) {
File blockFile = new File(dataDir, "data" + (dn+1) + "/current/" +
blockName);
System.out.println("Corrupting for: " + blockFile);
if (blockFile.exists()) {
// Corrupt replica by writing random bytes into replica
RandomAccessFile raFile = new RandomAccessFile(blockFile, "rw");
FileChannel channel = raFile.getChannel();
String badString = "BADBAD";
int rand = random.nextInt((int)channel.size()/2);
raFile.seek(rand);
raFile.write(badString.getBytes());
raFile.close();
}
corrupted = true;
}
return corrupted;
}
/*
* Shutdown a particular datanode
*/
public DataNodeProperties stopDataNode(int i) {
if (i < 0 || i >= dataNodes.size()) {
return null;
}
DataNodeProperties dnprop = dataNodes.remove(i);
DataNode dn = dnprop.datanode;
System.out.println("MiniDFSCluster Stopping DataNode " +
dn.dnRegistration.getName() +
" from a total of " + (dataNodes.size() + 1) +
" datanodes.");
dn.shutdown();
numDataNodes--;
return dnprop;
}
/**
* Restart a datanode
* @param dnprop datanode's property
* @return true if restarting is successful
* @throws IOException
*/
public synchronized boolean restartDataNode(DataNodeProperties dnprop)
throws IOException {
Configuration conf = dnprop.conf;
String[] args = dnprop.dnArgs;
Configuration newconf = new Configuration(conf); // save cloned config
dataNodes.add(new DataNodeProperties(
DataNode.createDataNode(args, conf),
newconf, args));
numDataNodes++;
return true;
}
/*
* Restart a particular datanode
*/
public synchronized boolean restartDataNode(int i) throws IOException {
DataNodeProperties dnprop = stopDataNode(i);
if (dnprop == null) {
return false;
} else {
return restartDataNode(dnprop);
}
}
/*
* Shutdown a datanode by name.
*/
public synchronized DataNodeProperties stopDataNode(String name) {
int i;
for (i = 0; i < dataNodes.size(); i++) {
DataNode dn = dataNodes.get(i).datanode;
if (dn.dnRegistration.getName().equals(name)) {
break;
}
}
return stopDataNode(i);
}
/**
* Returns true if the NameNode is running and is out of Safe Mode.
*/
public boolean isClusterUp() {
if (nameNode == null) {
return false;
}
try {
long[] sizes = nameNode.getStats();
boolean isUp = false;
synchronized (this) {
isUp = (!nameNode.isInSafeMode() && sizes[0] != 0);
}
return isUp;
} catch (IOException ie) {
return false;
}
}
/**
* Returns true if there is at least one DataNode running.
*/
public boolean isDataNodeUp() {
if (dataNodes == null || dataNodes.size() == 0) {
return false;
}
return true;
}
/**
* Get a client handle to the DFS cluster.
*/
public FileSystem getFileSystem() throws IOException {
return FileSystem.get(conf);
}
/**
* Get the directories where the namenode stores its image.
*/
public Collection<File> getNameDirs() {
return FSNamesystem.getNamespaceDirs(conf);
}
/**
* Get the directories where the namenode stores its edits.
*/
public Collection<File> getNameEditsDirs() {
return FSNamesystem.getNamespaceEditsDirs(conf);
}
/**
* Wait until the cluster is active and running.
*/
public void waitActive() throws IOException {
if (nameNode == null) {
return;
}
InetSocketAddress addr = new InetSocketAddress("localhost",
getNameNodePort());
DFSClient client = new DFSClient(addr, conf);
// make sure all datanodes are alive
while(client.datanodeReport(DatanodeReportType.LIVE).length
!= numDataNodes) {
try {
Thread.sleep(500);
} catch (Exception e) {
}
}
client.close();
}
public void formatDataNodeDirs() throws IOException {
base_dir = new File(System.getProperty("test.build.data", "build/test/data"), "dfs/");
data_dir = new File(base_dir, "data");
if (data_dir.exists() && !FileUtil.fullyDelete(data_dir)) {
throw new IOException("Cannot remove data directory: " + data_dir);
}
}
/**
*
* @param dataNodeIndex - data node whose block report is desired - the index is same as for getDataNodes()
* @return the block report for the specified data node
*/
public Block[] getBlockReport(int dataNodeIndex) {
if (dataNodeIndex < 0 || dataNodeIndex > dataNodes.size()) {
throw new IndexOutOfBoundsException();
}
return dataNodes.get(dataNodeIndex).datanode.getFSDataset().getBlockReport();
}
/**
*
* @return block reports from all data nodes
* Block[] is indexed in the same order as the list of datanodes returned by getDataNodes()
*/
public Block[][] getAllBlockReports() {
int numDataNodes = dataNodes.size();
Block[][] result = new Block[numDataNodes][];
for (int i = 0; i < numDataNodes; ++i) {
result[i] = getBlockReport(i);
}
return result;
}
/**
* This method is valid only if the data nodes have simulated data
* @param dataNodeIndex - data node i which to inject - the index is same as for getDataNodes()
* @param blocksToInject - the blocks
* @throws IOException
* if not simulatedFSDataset
* if any of blocks already exist in the data node
*
*/
public void injectBlocks(int dataNodeIndex, Block[] blocksToInject) throws IOException {
if (dataNodeIndex < 0 || dataNodeIndex > dataNodes.size()) {
throw new IndexOutOfBoundsException();
}
FSDatasetInterface dataSet = dataNodes.get(dataNodeIndex).datanode.getFSDataset();
if (!(dataSet instanceof SimulatedFSDataset)) {
throw new IOException("injectBlocks is valid only for SimilatedFSDataset");
}
SimulatedFSDataset sdataset = (SimulatedFSDataset) dataSet;
sdataset.injectBlocks(blocksToInject);
dataNodes.get(dataNodeIndex).datanode.scheduleBlockReport(0);
}
/**
* This method is valid only if the data nodes have simulated data
* @param blocksToInject - blocksToInject[] is indexed in the same order as the list
* of datanodes returned by getDataNodes()
* @throws IOException
* if not simulatedFSDataset
* if any of blocks already exist in the data nodes
* Note the rest of the blocks are not injected.
*/
public void injectBlocks(Block[][] blocksToInject) throws IOException {
if (blocksToInject.length > dataNodes.size()) {
throw new IndexOutOfBoundsException();
}
for (int i = 0; i < blocksToInject.length; ++i) {
injectBlocks(i, blocksToInject[i]);
}
}
/**
* Set the softLimit and hardLimit of client lease periods
*/
void setLeasePeriod(long soft, long hard) {
nameNode.namesystem.leaseManager.setLeasePeriod(soft, hard);
nameNode.namesystem.lmthread.interrupt();
}
/**
* Returns the current set of datanodes
*/
DataNode[] listDataNodes() {
DataNode[] list = new DataNode[dataNodes.size()];
for (int i = 0; i < dataNodes.size(); i++) {
list[i] = dataNodes.get(i).datanode;
}
return list;
}
/**
* Access to the data directory used for Datanodes
* @throws IOException
*/
public String getDataDirectory() {
return data_dir.getAbsolutePath();
}
}