/**
* 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.dfs;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.dfs.DistributedFileSystem.DiskStatus;
import org.apache.hadoop.dfs.FSConstants.UpgradeAction;
import org.apache.hadoop.fs.FsShell;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.hadoop.util.ToolRunner;
/**
* This class provides some DFS administrative access.
*/
public class DFSAdmin extends FsShell {
/**
* Construct a DFSAdmin object.
*/
public DFSAdmin() {
this(null);
}
/**
* Construct a DFSAdmin object.
*/
public DFSAdmin(Configuration conf) {
super(conf);
}
/**
* Gives a report on how the FileSystem is doing.
* @exception IOException if the filesystem does not exist.
*/
public void report() throws IOException {
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem dfs = (DistributedFileSystem) fs;
DiskStatus ds = dfs.getDiskStatus();
long raw = ds.getCapacity();
long rawUsed = ds.getDfsUsed();
long remaining = ds.getRemaining();
long used = dfs.getUsed();
boolean mode = dfs.setSafeMode(FSConstants.SafeModeAction.SAFEMODE_GET);
UpgradeStatusReport status =
dfs.distributedUpgradeProgress(UpgradeAction.GET_STATUS);
if (mode) {
System.out.println("Safe mode is ON");
}
if (status != null) {
System.out.println(status.getStatusText(false));
}
System.out.println("Total raw bytes: " + raw
+ " (" + byteDesc(raw) + ")");
System.out.println("Remaining raw bytes: " + remaining
+ " (" + byteDesc(remaining) + ")");
System.out.println("Used raw bytes: " + rawUsed
+ " (" + byteDesc(rawUsed) + ")");
System.out.println("% used: "
+ limitDecimalTo2(((1.0 * rawUsed) / raw) * 100)
+ "%");
System.out.println();
System.out.println("Total effective bytes: " + used
+ " (" + byteDesc(used) + ")");
System.out.println("Effective replication multiplier: "
+ (1.0 * rawUsed / used));
System.out.println("-------------------------------------------------");
DatanodeInfo[] info = dfs.getDataNodeStats();
System.out.println("Datanodes available: " + info.length);
System.out.println();
for (int i = 0; i < info.length; i++) {
System.out.println(info[i].getDatanodeReport());
System.out.println();
}
}
}
/**
* Safe mode maintenance command.
* Usage: java DFSAdmin -safemode [enter | leave | get]
* @param argv List of of command line parameters.
* @param idx The index of the command that is being processed.
* @exception IOException if the filesystem does not exist.
*/
public void setSafeMode(String[] argv, int idx) throws IOException {
if (!(fs instanceof DistributedFileSystem)) {
System.err.println("FileSystem is " + fs.getUri());
return;
}
if (idx != argv.length - 1) {
printUsage("-safemode");
return;
}
FSConstants.SafeModeAction action;
Boolean waitExitSafe = false;
if ("leave".equalsIgnoreCase(argv[idx])) {
action = FSConstants.SafeModeAction.SAFEMODE_LEAVE;
} else if ("enter".equalsIgnoreCase(argv[idx])) {
action = FSConstants.SafeModeAction.SAFEMODE_ENTER;
} else if ("get".equalsIgnoreCase(argv[idx])) {
action = FSConstants.SafeModeAction.SAFEMODE_GET;
} else if ("wait".equalsIgnoreCase(argv[idx])) {
action = FSConstants.SafeModeAction.SAFEMODE_GET;
waitExitSafe = true;
} else {
printUsage("-safemode");
return;
}
DistributedFileSystem dfs = (DistributedFileSystem) fs;
boolean inSafeMode = dfs.setSafeMode(action);
//
// If we are waiting for safemode to exit, then poll and
// sleep till we are out of safemode.
//
if (waitExitSafe) {
while (inSafeMode) {
try {
Thread.sleep(5000);
} catch (java.lang.InterruptedException e) {
throw new IOException("Wait Interrupted");
}
inSafeMode = dfs.setSafeMode(action);
}
}
System.out.println("Safe mode is " + (inSafeMode ? "ON" : "OFF"));
}
/**
* Command to ask the namenode to reread the hosts and excluded hosts
* file.
* Usage: java DFSAdmin -refreshNodes
* @exception IOException
*/
public int refreshNodes() throws IOException {
int exitCode = -1;
if (!(fs instanceof DistributedFileSystem)) {
System.err.println("FileSystem is " + fs.getName());
return exitCode;
}
DistributedFileSystem dfs = (DistributedFileSystem) fs;
dfs.refreshNodes();
exitCode = 0;
return exitCode;
}
private void printHelp(String cmd) {
String summary = "hadoop dfsadmin is the command to execute DFS administrative commands.\n" +
"The full syntax is: \n\n" +
"hadoop dfsadmin [-report] [-safemode <enter | leave | get | wait>]\n" +
"\t[-refreshNodes] [-help [cmd]]\n";
String report ="-report: \tReports basic filesystem information and statistics.\n";
String safemode = "-safemode <enter|leave|get|wait>: Safe mode maintenance command.\n" +
"\t\tSafe mode is a Namenode state in which it\n" +
"\t\t\t1. does not accept changes to the name space (read-only)\n" +
"\t\t\t2. does not replicate or delete blocks.\n" +
"\t\tSafe mode is entered automatically at Namenode startup, and\n" +
"\t\tleaves safe mode automatically when the configured minimum\n" +
"\t\tpercentage of blocks satisfies the minimum replication\n" +
"\t\tcondition. Safe mode can also be entered manually, but then\n" +
"\t\tit can only be turned off manually as well.\n";
String refreshNodes = "-refreshNodes: \tRe-read the hosts and exclude files to update the set\n" +
"\t\tof Datanodes that are allowed to connect to the Namenode\n" +
"\t\tand those that should be decommissioned of recommissioned.\n";
String finalizeUpgrade = "-finalizeUpgrade: Finalize upgrade of DFS.\n" +
"\t\tDatanodes delete their previous version working directories,\n" +
"\t\tfollowed by Namenode doing the same.\n" +
"\t\tThis completes the upgrade process.\n";
String upgradeProgress = "-upgradeProgress <status|details|force>: \n" +
"\t\trequest current distributed upgrade status, \n" +
"\t\ta detailed status or force the upgrade to proceed.\n";
String metaSave = "-metasave <filename>: \tSave Namenode's primary data structures\n" +
"\t\tto <filename> in the directory specified by hadoop.log.dir property.\n" +
"\t\t<filename> will contain one line for each of the following\n" +
"\t\t\t1. Datanodes heart beating with Namenode\n" +
"\t\t\t2. Blocks waiting to be replicated\n" +
"\t\t\t3. Blocks currrently being replicated\n" +
"\t\t\t4. Blocks waiting to be deleted\n";
String help = "-help [cmd]: \tDisplays help for the given command or all commands if none\n" +
"\t\tis specified.\n";
if ("report".equals(cmd)) {
System.out.println(report);
} else if ("safemode".equals(cmd)) {
System.out.println(safemode);
} else if ("refreshNodes".equals(cmd)) {
System.out.println(refreshNodes);
} else if ("finalizeUpgrade".equals(cmd)) {
System.out.println(finalizeUpgrade);
} else if ("upgradeProgress".equals(cmd)) {
System.out.println(upgradeProgress);
} else if ("metasave".equals(cmd)) {
System.out.println(metaSave);
} else if ("help".equals(cmd)) {
System.out.println(help);
} else {
System.out.println(summary);
System.out.println(report);
System.out.println(safemode);
System.out.println(refreshNodes);
System.out.println(finalizeUpgrade);
System.out.println(upgradeProgress);
System.out.println(metaSave);
System.out.println(help);
System.out.println();
ToolRunner.printGenericCommandUsage(System.out);
}
}
/**
* Command to ask the namenode to finalize previously performed upgrade.
* Usage: java DFSAdmin -finalizeUpgrade
* @exception IOException
*/
public int finalizeUpgrade() throws IOException {
int exitCode = -1;
if (!(fs instanceof DistributedFileSystem)) {
System.out.println("FileSystem is " + fs.getUri());
return exitCode;
}
DistributedFileSystem dfs = (DistributedFileSystem) fs;
dfs.finalizeUpgrade();
exitCode = 0;
return exitCode;
}
/**
* Command to request current distributed upgrade status,
* a detailed status, or to force the upgrade to proceed.
*
* Usage: java DFSAdmin -upgradeProgress [status | details | force]
* @exception IOException
*/
public int upgradeProgress(String[] argv, int idx) throws IOException {
if (!(fs instanceof DistributedFileSystem)) {
System.out.println("FileSystem is " + fs.getUri());
return -1;
}
if (idx != argv.length - 1) {
printUsage("-upgradeProgress");
return -1;
}
UpgradeAction action;
if ("status".equalsIgnoreCase(argv[idx])) {
action = UpgradeAction.GET_STATUS;
} else if ("details".equalsIgnoreCase(argv[idx])) {
action = UpgradeAction.DETAILED_STATUS;
} else if ("force".equalsIgnoreCase(argv[idx])) {
action = UpgradeAction.FORCE_PROCEED;
} else {
printUsage("-upgradeProgress");
return -1;
}
DistributedFileSystem dfs = (DistributedFileSystem) fs;
UpgradeStatusReport status = dfs.distributedUpgradeProgress(action);
String statusText = (status == null ?
"There are no distributed upgrades in progress." :
status.getStatusText(action == UpgradeAction.DETAILED_STATUS));
System.out.println(statusText);
return 0;
}
/**
* Dumps DFS data structures into specified file.
* Usage: java DFSAdmin -metasave filename
* @param argv List of of command line parameters.
* @param idx The index of the command that is being processed.
* @exception IOException if an error accoured wile accessing
* the file or path.
*/
public int metaSave(String[] argv, int idx) throws IOException {
String pathname = argv[idx];
DistributedFileSystem dfs = (DistributedFileSystem) fs;
dfs.metaSave(pathname);
System.out.println("Created file " + pathname + " on server " +
dfs.getUri());
return 0;
}
/**
* Displays format of commands.
* @param cmd The command that is being executed.
*/
public void printUsage(String cmd) {
if ("-report".equals(cmd)) {
System.err.println("Usage: java DFSAdmin"
+ " [-report]");
} else if ("-safemode".equals(cmd)) {
System.err.println("Usage: java DFSAdmin"
+ " [-safemode enter | leave | get | wait]");
} else if ("-refreshNodes".equals(cmd)) {
System.err.println("Usage: java DFSAdmin"
+ " [-refreshNodes]");
} else if ("-finalizeUpgrade".equals(cmd)) {
System.err.println("Usage: java DFSAdmin"
+ " [-finalizeUpgrade]");
} else if ("-upgradeProgress".equals(cmd)) {
System.err.println("Usage: java DFSAdmin"
+ " [-upgradeProgress status | details | force]");
} else if ("-metasave".equals(cmd)) {
System.err.println("Usage: java DFSAdmin"
+ " [-metasave filename]");
} else {
System.err.println("Usage: java DFSAdmin");
System.err.println(" [-report]");
System.err.println(" [-safemode enter | leave | get | wait]");
System.err.println(" [-refreshNodes]");
System.err.println(" [-finalizeUpgrade]");
System.err.println(" [-upgradeProgress status | details | force]");
System.err.println(" [-metasave filename]");
System.err.println(" [-help [cmd]]");
System.err.println();
ToolRunner.printGenericCommandUsage(System.err);
}
}
/**
* @param argv The parameters passed to this program.
* @exception Exception if the filesystem does not exist.
* @return 0 on success, non zero on error.
*/
@Override
public int run(String[] argv) throws Exception {
if (argv.length < 1) {
printUsage("");
return -1;
}
int exitCode = -1;
int i = 0;
String cmd = argv[i++];
//
// verify that we have enough command line parameters
//
if ("-safemode".equals(cmd)) {
if (argv.length != 2) {
printUsage(cmd);
return exitCode;
}
} else if ("-report".equals(cmd)) {
if (argv.length != 1) {
printUsage(cmd);
return exitCode;
}
} else if ("-refreshNodes".equals(cmd)) {
if (argv.length != 1) {
printUsage(cmd);
return exitCode;
}
} else if ("-finalizeUpgrade".equals(cmd)) {
if (argv.length != 1) {
printUsage(cmd);
return exitCode;
}
} else if ("-upgradeProgress".equals(cmd)) {
if (argv.length != 2) {
printUsage(cmd);
return exitCode;
}
} else if ("-metasave".equals(cmd)) {
if (argv.length != 2) {
printUsage(cmd);
return exitCode;
}
}
// initialize DFSAdmin
try {
init();
} catch (RPC.VersionMismatch v) {
System.err.println("Version Mismatch between client and server"
+ "... command aborted.");
return exitCode;
} catch (IOException e) {
System.err.println("Bad connection to DFS... command aborted.");
return exitCode;
}
exitCode = 0;
try {
if ("-report".equals(cmd)) {
report();
} else if ("-safemode".equals(cmd)) {
setSafeMode(argv, i);
} else if ("-refreshNodes".equals(cmd)) {
exitCode = refreshNodes();
} else if ("-finalizeUpgrade".equals(cmd)) {
exitCode = finalizeUpgrade();
} else if ("-upgradeProgress".equals(cmd)) {
exitCode = upgradeProgress(argv, i);
} else if ("-metasave".equals(cmd)) {
exitCode = metaSave(argv, i);
} else if ("-help".equals(cmd)) {
if (i < argv.length) {
printHelp(argv[i]);
} else {
printHelp("");
}
} else {
exitCode = -1;
System.err.println(cmd.substring(1) + ": Unknown command");
printUsage("");
}
} catch (RemoteException e) {
//
// This is a error returned by hadoop server. Print
// out the first line of the error mesage, ignore the stack trace.
exitCode = -1;
try {
String[] content;
content = e.getLocalizedMessage().split("\n");
System.err.println(cmd.substring(1) + ": "
+ content[0]);
} catch (Exception ex) {
System.err.println(cmd.substring(1) + ": "
+ ex.getLocalizedMessage());
}
} catch (IOException e) {
//
// IO exception encountered locally.
//
exitCode = -1;
System.err.println(cmd.substring(1) + ": "
+ e.getLocalizedMessage());
} finally {
fs.close();
}
return exitCode;
}
/**
* main() has some simple utility methods.
* @param argv Command line parameters.
* @exception Exception if the filesystem does not exist.
*/
public static void main(String[] argv) throws Exception {
int res = ToolRunner.run(new DFSAdmin(), argv);
System.exit(res);
}
}