/**
* 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.server.namenode;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Random;
import java.util.TreeSet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspWriter;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.FSConstants.UpgradeAction;
import org.apache.hadoop.hdfs.server.common.HdfsConstants;
import org.apache.hadoop.hdfs.server.common.UpgradeStatusReport;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.*;
public class JspHelper {
final static public String WEB_UGI_PROPERTY_NAME = "dfs.web.ugi";
static FSNamesystem fsn = null;
public static InetSocketAddress nameNodeAddr;
public static final Configuration conf = new Configuration();
public static final UnixUserGroupInformation webUGI
= UnixUserGroupInformation.createImmutable(
conf.getStrings(WEB_UGI_PROPERTY_NAME));
public static final int defaultChunkSizeToView =
conf.getInt("dfs.default.chunk.view.size", 32 * 1024);
static Random rand = new Random();
public JspHelper() {
fsn = FSNamesystem.getFSNamesystem();
if (DataNode.getDataNode() != null) {
nameNodeAddr = DataNode.getDataNode().getNameNodeAddr();
}
else {
nameNodeAddr = fsn.getDFSNameNodeAddress();
}
UnixUserGroupInformation.saveToConf(conf,
UnixUserGroupInformation.UGI_PROPERTY_NAME, webUGI);
}
public DatanodeID randomNode() throws IOException {
return fsn.getRandomDatanode();
}
public DatanodeInfo bestNode(LocatedBlock blk) throws IOException {
TreeSet<DatanodeInfo> deadNodes = new TreeSet<DatanodeInfo>();
DatanodeInfo chosenNode = null;
int failures = 0;
Socket s = null;
DatanodeInfo [] nodes = blk.getLocations();
if (nodes == null || nodes.length == 0) {
throw new IOException("No nodes contain this block");
}
while (s == null) {
if (chosenNode == null) {
do {
chosenNode = nodes[rand.nextInt(nodes.length)];
} while (deadNodes.contains(chosenNode));
}
int index = rand.nextInt(nodes.length);
chosenNode = nodes[index];
//just ping to check whether the node is alive
InetSocketAddress targetAddr = NetUtils.createSocketAddr(
chosenNode.getHost() + ":" + chosenNode.getInfoPort());
try {
s = new Socket();
s.connect(targetAddr, HdfsConstants.READ_TIMEOUT);
s.setSoTimeout(HdfsConstants.READ_TIMEOUT);
} catch (IOException e) {
deadNodes.add(chosenNode);
s.close();
s = null;
failures++;
}
if (failures == nodes.length)
throw new IOException("Could not reach the block containing the data. Please try again");
}
s.close();
return chosenNode;
}
public void streamBlockInAscii(InetSocketAddress addr, long blockId,
long genStamp, long blockSize,
long offsetIntoBlock, long chunkSizeToView, JspWriter out)
throws IOException {
if (chunkSizeToView == 0) return;
Socket s = new Socket();
s.connect(addr, HdfsConstants.READ_TIMEOUT);
s.setSoTimeout(HdfsConstants.READ_TIMEOUT);
long amtToRead = Math.min(chunkSizeToView, blockSize - offsetIntoBlock);
// Use the block name for file name.
DFSClient.BlockReader blockReader =
DFSClient.BlockReader.newBlockReader(s, addr.toString() + ":" + blockId,
blockId, genStamp ,offsetIntoBlock,
amtToRead,
conf.getInt("io.file.buffer.size",
4096));
byte[] buf = new byte[(int)amtToRead];
int readOffset = 0;
int retries = 2;
while ( amtToRead > 0 ) {
int numRead;
try {
numRead = blockReader.readAll(buf, readOffset, (int)amtToRead);
}
catch (IOException e) {
retries--;
if (retries == 0)
throw new IOException("Could not read data from datanode");
continue;
}
amtToRead -= numRead;
readOffset += numRead;
}
blockReader = null;
s.close();
out.print(new String(buf));
}
public void DFSNodesStatus(ArrayList<DatanodeDescriptor> live,
ArrayList<DatanodeDescriptor> dead) {
if (fsn != null)
fsn.DFSNodesStatus(live, dead);
}
public void addTableHeader(JspWriter out) throws IOException {
out.print("<table border=\"1\""+
" cellpadding=\"2\" cellspacing=\"2\">");
out.print("<tbody>");
}
public void addTableRow(JspWriter out, String[] columns) throws IOException {
out.print("<tr>");
for (int i = 0; i < columns.length; i++) {
out.print("<td style=\"vertical-align: top;\"><B>"+columns[i]+"</B><br></td>");
}
out.print("</tr>");
}
public void addTableRow(JspWriter out, String[] columns, int row) throws IOException {
out.print("<tr>");
for (int i = 0; i < columns.length; i++) {
if (row/2*2 == row) {//even
out.print("<td style=\"vertical-align: top;background-color:LightGrey;\"><B>"+columns[i]+"</B><br></td>");
} else {
out.print("<td style=\"vertical-align: top;background-color:LightBlue;\"><B>"+columns[i]+"</B><br></td>");
}
}
out.print("</tr>");
}
public void addTableFooter(JspWriter out) throws IOException {
out.print("</tbody></table>");
}
public String getSafeModeText() {
if (!fsn.isInSafeMode())
return "";
return "Safe mode is ON. <em>" + fsn.getSafeModeTip() + "</em><br>";
}
public static String getWarningText(FSNamesystem fsn) {
// Ideally this should be displayed in RED
long missingBlocks = fsn.getMissingBlocksCount();
if (missingBlocks > 0) {
return "<br> WARNING :" +
" There are about " + missingBlocks +
" missing blocks. Please check the log or run fsck. <br><br>";
}
return "";
}
public String getInodeLimitText() {
long inodes = fsn.dir.totalInodes();
long blocks = fsn.getBlocksTotal();
long maxobjects = fsn.getMaxObjects();
long totalMemory = Runtime.getRuntime().totalMemory();
long maxMemory = Runtime.getRuntime().maxMemory();
long used = (totalMemory * 100)/maxMemory;
String str = inodes + " files and directories, " +
blocks + " blocks = " +
(inodes + blocks) + " total";
if (maxobjects != 0) {
long pct = ((inodes + blocks) * 100)/maxobjects;
str += " / " + maxobjects + " (" + pct + "%)";
}
str += ". Heap Size is " + StringUtils.byteDesc(totalMemory) + " / " +
StringUtils.byteDesc(maxMemory) +
" (" + used + "%) <br>";
return str;
}
public String getUpgradeStatusText() {
String statusText = "";
try {
UpgradeStatusReport status =
fsn.distributedUpgradeProgress(UpgradeAction.GET_STATUS);
statusText = (status == null ?
"There are no upgrades in progress." :
status.getStatusText(false));
} catch(IOException e) {
statusText = "Upgrade status unknown.";
}
return statusText;
}
public void sortNodeList(ArrayList<DatanodeDescriptor> nodes,
String field, String order) {
class NodeComapare implements Comparator<DatanodeDescriptor> {
static final int
FIELD_NAME = 1,
FIELD_LAST_CONTACT = 2,
FIELD_BLOCKS = 3,
FIELD_CAPACITY = 4,
FIELD_USED = 5,
FIELD_PERCENT_USED = 6,
FIELD_NONDFS_USED = 7,
FIELD_REMAINING = 8,
FIELD_PERCENT_REMAINING = 9,
SORT_ORDER_ASC = 1,
SORT_ORDER_DSC = 2;
int sortField = FIELD_NAME;
int sortOrder = SORT_ORDER_ASC;
public NodeComapare(String field, String order) {
if (field.equals("lastcontact")) {
sortField = FIELD_LAST_CONTACT;
} else if (field.equals("capacity")) {
sortField = FIELD_CAPACITY;
} else if (field.equals("used")) {
sortField = FIELD_USED;
} else if (field.equals("nondfsused")) {
sortField = FIELD_NONDFS_USED;
} else if (field.equals("remaining")) {
sortField = FIELD_REMAINING;
} else if (field.equals("pcused")) {
sortField = FIELD_PERCENT_USED;
} else if (field.equals("pcremaining")) {
sortField = FIELD_PERCENT_REMAINING;
} else if (field.equals("blocks")) {
sortField = FIELD_BLOCKS;
} else {
sortField = FIELD_NAME;
}
if (order.equals("DSC")) {
sortOrder = SORT_ORDER_DSC;
} else {
sortOrder = SORT_ORDER_ASC;
}
}
public int compare(DatanodeDescriptor d1,
DatanodeDescriptor d2) {
int ret = 0;
switch (sortField) {
case FIELD_LAST_CONTACT:
ret = (int) (d2.getLastUpdate() - d1.getLastUpdate());
break;
case FIELD_CAPACITY:
long dlong = d1.getCapacity() - d2.getCapacity();
ret = (dlong < 0) ? -1 : ((dlong > 0) ? 1 : 0);
break;
case FIELD_USED:
dlong = d1.getDfsUsed() - d2.getDfsUsed();
ret = (dlong < 0) ? -1 : ((dlong > 0) ? 1 : 0);
break;
case FIELD_NONDFS_USED:
dlong = d1.getNonDfsUsed() - d2.getNonDfsUsed();
ret = (dlong < 0) ? -1 : ((dlong > 0) ? 1 : 0);
break;
case FIELD_REMAINING:
dlong = d1.getRemaining() - d2.getRemaining();
ret = (dlong < 0) ? -1 : ((dlong > 0) ? 1 : 0);
break;
case FIELD_PERCENT_USED:
double ddbl =((d1.getDfsUsedPercent())-
(d2.getDfsUsedPercent()));
ret = (ddbl < 0) ? -1 : ((ddbl > 0) ? 1 : 0);
break;
case FIELD_PERCENT_REMAINING:
ddbl =((d1.getRemainingPercent())-
(d2.getRemainingPercent()));
ret = (ddbl < 0) ? -1 : ((ddbl > 0) ? 1 : 0);
break;
case FIELD_BLOCKS:
ret = d1.numBlocks() - d2.numBlocks();
break;
case FIELD_NAME:
ret = d1.getHostName().compareTo(d2.getHostName());
break;
}
return (sortOrder == SORT_ORDER_DSC) ? -ret : ret;
}
}
Collections.sort(nodes, new NodeComapare(field, order));
}
public static void printPathWithLinks(String dir, JspWriter out, int namenodeInfoPort ) throws IOException {
try {
String[] parts = dir.split(Path.SEPARATOR);
StringBuilder tempPath = new StringBuilder(dir.length());
out.print("<a href=\"browseDirectory.jsp" + "?dir="+ Path.SEPARATOR
+ "&namenodeInfoPort=" + namenodeInfoPort
+ "\">" + Path.SEPARATOR + "</a>");
tempPath.append(Path.SEPARATOR);
for (int i = 0; i < parts.length-1; i++) {
if (!parts[i].equals("")) {
tempPath.append(parts[i]);
out.print("<a href=\"browseDirectory.jsp" + "?dir="
+ tempPath.toString() + "&namenodeInfoPort=" + namenodeInfoPort);
out.print("\">" + parts[i] + "</a>" + Path.SEPARATOR);
tempPath.append(Path.SEPARATOR);
}
}
if(parts.length > 0) {
out.print(parts[parts.length-1]);
}
}
catch (UnsupportedEncodingException ex) {
ex.printStackTrace();
}
}
public static void printGotoForm(JspWriter out, int namenodeInfoPort, String file) throws IOException {
out.print("<form action=\"browseDirectory.jsp\" method=\"get\" name=\"goto\">");
out.print("Goto : ");
out.print("<input name=\"dir\" type=\"text\" width=\"50\" id\"dir\" value=\""+ file+"\">");
out.print("<input name=\"go\" type=\"submit\" value=\"go\">");
out.print("<input name=\"namenodeInfoPort\" type=\"hidden\" "
+ "value=\"" + namenodeInfoPort + "\">");
out.print("</form>");
}
public static void createTitle(JspWriter out,
HttpServletRequest req, String file) throws IOException{
if(file == null) file = "";
int start = Math.max(0,file.length() - 100);
if(start != 0)
file = "..." + file.substring(start, file.length());
out.print("<title>HDFS:" + file + "</title>");
}
}