/**
* 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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetSocketAddress;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import javax.management.MalformedObjectNameException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo.AdminStates;
import org.apache.hadoop.util.StringUtils;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.TypeReference;
import org.znerd.xmlenc.XMLOutputter;
/**
* This class generates the data that is needed to be displayed on cluster web
* console.
*/
@InterfaceAudience.Private
class ClusterJspHelper {
private static final Log LOG = LogFactory.getLog(ClusterJspHelper.class);
public static final String OVERALL_STATUS = "overall-status";
public static final String DEAD = "Dead";
private static final String JMX_QRY =
"/jmx?qry=Hadoop:service=NameNode,name=NameNodeInfo";
/**
* JSP helper function that generates cluster health report. When
* encountering exception while getting Namenode status, the exception will
* be listed on the page with corresponding stack trace.
*/
ClusterStatus generateClusterHealthReport() {
ClusterStatus cs = new ClusterStatus();
Configuration conf = new Configuration();
List<InetSocketAddress> isas = null;
try {
isas = DFSUtil.getNNServiceRpcAddresses(conf);
} catch (Exception e) {
// Could not build cluster status
cs.setError(e);
return cs;
}
// Process each namenode and add it to ClusterStatus
for (InetSocketAddress isa : isas) {
NamenodeMXBeanHelper nnHelper = null;
try {
nnHelper = new NamenodeMXBeanHelper(isa, conf);
String mbeanProps= queryMbean(nnHelper.httpAddress, conf);
NamenodeStatus nn = nnHelper.getNamenodeStatus(mbeanProps);
if (cs.clusterid.isEmpty() || cs.clusterid.equals("")) { // Set clusterid only once
cs.clusterid = nnHelper.getClusterId(mbeanProps);
}
cs.addNamenodeStatus(nn);
} catch ( Exception e ) {
// track exceptions encountered when connecting to namenodes
cs.addException(isa.getHostName(), e);
continue;
}
}
return cs;
}
/**
* Helper function that generates the decommissioning report. Connect to each
* Namenode over http via JmxJsonServlet to collect the data nodes status.
*/
DecommissionStatus generateDecommissioningReport() {
String clusterid = "";
Configuration conf = new Configuration();
List<InetSocketAddress> isas = null;
try {
isas = DFSUtil.getNNServiceRpcAddresses(conf);
} catch (Exception e) {
// catch any exception encountered other than connecting to namenodes
DecommissionStatus dInfo = new DecommissionStatus(clusterid, e);
return dInfo;
}
// Outer map key is datanode. Inner map key is namenode and the value is
// decom status of the datanode for the corresponding namenode
Map<String, Map<String, String>> statusMap =
new HashMap<String, Map<String, String>>();
// Map of exceptions encountered when connecting to namenode
// key is namenode and value is exception
Map<String, Exception> decommissionExceptions =
new HashMap<String, Exception>();
List<String> unreportedNamenode = new ArrayList<String>();
for (InetSocketAddress isa : isas) {
NamenodeMXBeanHelper nnHelper = null;
try {
nnHelper = new NamenodeMXBeanHelper(isa, conf);
String mbeanProps= queryMbean(nnHelper.httpAddress, conf);
if (clusterid.equals("")) {
clusterid = nnHelper.getClusterId(mbeanProps);
}
nnHelper.getDecomNodeInfoForReport(statusMap, mbeanProps);
} catch (Exception e) {
// catch exceptions encountered while connecting to namenodes
String nnHost = isa.getHostName();
decommissionExceptions.put(nnHost, e);
unreportedNamenode.add(nnHost);
continue;
}
}
updateUnknownStatus(statusMap, unreportedNamenode);
getDecommissionNodeClusterState(statusMap);
return new DecommissionStatus(statusMap, clusterid,
getDatanodeHttpPort(conf), decommissionExceptions);
}
/**
* Based on the state of the datanode at each namenode, marks the overall
* state of the datanode across all the namenodes, to one of the following:
* <ol>
* <li>{@link DecommissionStates#DECOMMISSIONED}</li>
* <li>{@link DecommissionStates#DECOMMISSION_INPROGRESS}</li>
* <li>{@link DecommissionStates#PARTIALLY_DECOMMISSIONED}</li>
* <li>{@link DecommissionStates#UNKNOWN}</li>
* </ol>
*
* @param statusMap
* map whose key is datanode, value is an inner map with key being
* namenode, value being decommission state.
*/
private void getDecommissionNodeClusterState(
Map<String, Map<String, String>> statusMap) {
if (statusMap == null || statusMap.isEmpty()) {
return;
}
// For each datanodes
Iterator<Entry<String, Map<String, String>>> it =
statusMap.entrySet().iterator();
while (it.hasNext()) {
// Map entry for a datanode:
// key is namenode, value is datanode status at the namenode
Entry<String, Map<String, String>> entry = it.next();
Map<String, String> nnStatus = entry.getValue();
if (nnStatus == null || nnStatus.isEmpty()) {
continue;
}
boolean isUnknown = false;
int unknown = 0;
int decommissioned = 0;
int decomInProg = 0;
int inservice = 0;
int dead = 0;
DecommissionStates overallState = DecommissionStates.UNKNOWN;
// Process a datanode state from each namenode
for (Map.Entry<String, String> m : nnStatus.entrySet()) {
String status = m.getValue();
if (status.equals(DecommissionStates.UNKNOWN.toString())) {
isUnknown = true;
unknown++;
} else
if (status.equals(AdminStates.DECOMMISSION_INPROGRESS.toString())) {
decomInProg++;
} else if (status.equals(AdminStates.DECOMMISSIONED.toString())) {
decommissioned++;
} else if (status.equals(AdminStates.NORMAL.toString())) {
inservice++;
} else if (status.equals(DEAD)) {
// dead
dead++;
}
}
// Consolidate all the states from namenode in to overall state
int nns = nnStatus.keySet().size();
if ((inservice + dead + unknown) == nns) {
// Do not display this data node. Remove this entry from status map.
it.remove();
} else if (isUnknown) {
overallState = DecommissionStates.UNKNOWN;
} else if (decommissioned == nns) {
overallState = DecommissionStates.DECOMMISSIONED;
} else if ((decommissioned + decomInProg) == nns) {
overallState = DecommissionStates.DECOMMISSION_INPROGRESS;
} else if ((decommissioned + decomInProg < nns)
&& (decommissioned + decomInProg > 0)){
overallState = DecommissionStates.PARTIALLY_DECOMMISSIONED;
} else {
LOG.warn("Cluster console encounters a not handled situtation.");
}
// insert overall state
nnStatus.put(OVERALL_STATUS, overallState.toString());
}
}
/**
* update unknown status in datanode status map for every unreported namenode
*/
private void updateUnknownStatus(Map<String, Map<String, String>> statusMap,
List<String> unreportedNn) {
if (unreportedNn == null || unreportedNn.isEmpty()) {
// no unreported namenodes
return;
}
for (Map.Entry<String, Map<String,String>> entry : statusMap.entrySet()) {
String dn = entry.getKey();
Map<String, String> nnStatus = entry.getValue();
for (String nn : unreportedNn) {
nnStatus.put(nn, DecommissionStates.UNKNOWN.toString());
}
statusMap.put(dn, nnStatus);
}
}
/**
* Get datanode http port from configration
*/
private int getDatanodeHttpPort(Configuration conf) {
String address = conf.get(DFSConfigKeys.DFS_DATANODE_HTTP_ADDRESS_KEY, "");
if (address.equals("")) {
return -1;
}
return Integer.parseInt(address.split(":")[1]);
}
/**
* Class for connecting to Namenode over http via JmxJsonServlet
* to get JMX attributes exposed by the MXBean.
*/
static class NamenodeMXBeanHelper {
private static final ObjectMapper mapper = new ObjectMapper();
private final String host;
private final String httpAddress;
NamenodeMXBeanHelper(InetSocketAddress addr, Configuration conf)
throws IOException, MalformedObjectNameException {
this.host = addr.getHostName();
this.httpAddress = DFSUtil.getInfoServer(addr, conf, false);
}
/** Get the map corresponding to the JSON string */
private static Map<String, Map<String, Object>> getNodeMap(String json)
throws IOException {
TypeReference<Map<String, Map<String, Object>>> type =
new TypeReference<Map<String, Map<String, Object>>>() { };
return mapper.readValue(json, type);
}
/**
* Get the number of live datanodes.
*
* @param json JSON string that contains live node status.
* @param nn namenode status to return information in
*/
private static void getLiveNodeCount(String json, NamenodeStatus nn)
throws IOException {
// Map of datanode host to (map of attribute name to value)
Map<String, Map<String, Object>> nodeMap = getNodeMap(json);
if (nodeMap == null || nodeMap.isEmpty()) {
return;
}
nn.liveDatanodeCount = nodeMap.size();
for (Entry<String, Map<String, Object>> entry : nodeMap.entrySet()) {
// Inner map of attribute name to value
Map<String, Object> innerMap = entry.getValue();
if (innerMap != null) {
if (((String) innerMap.get("adminState"))
.equals(AdminStates.DECOMMISSIONED.toString())) {
nn.liveDecomCount++;
}
}
}
}
/**
* Count the number of dead datanode.
*
* @param nn namenode
* @param json JSON string
*/
private static void getDeadNodeCount(String json, NamenodeStatus nn)
throws IOException {
Map<String, Map<String, Object>> nodeMap = getNodeMap(json);
if (nodeMap == null || nodeMap.isEmpty()) {
return;
}
nn.deadDatanodeCount = nodeMap.size();
for (Entry<String, Map<String, Object>> entry : nodeMap.entrySet()) {
Map<String, Object> innerMap = entry.getValue();
if (innerMap != null && !innerMap.isEmpty()) {
if (((Boolean) innerMap.get("decommissioned"))
.booleanValue() == true) {
nn.deadDecomCount++;
}
}
}
}
public String getClusterId(String props) throws IOException {
return getProperty(props, "ClusterId").getTextValue();
}
public NamenodeStatus getNamenodeStatus(String props) throws IOException,
MalformedObjectNameException, NumberFormatException {
NamenodeStatus nn = new NamenodeStatus();
nn.host = host;
nn.filesAndDirectories = getProperty(props, "TotalFiles").getLongValue();
nn.capacity = getProperty(props, "Total").getLongValue();
nn.free = getProperty(props, "Free").getLongValue();
nn.bpUsed = getProperty(props, "BlockPoolUsedSpace").getLongValue();
nn.nonDfsUsed = getProperty(props, "NonDfsUsedSpace").getLongValue();
nn.blocksCount = getProperty(props, "TotalBlocks").getLongValue();
nn.missingBlocksCount = getProperty(props, "NumberOfMissingBlocks")
.getLongValue();
nn.httpAddress = httpAddress;
getLiveNodeCount(getProperty(props, "LiveNodes").getValueAsText(), nn);
getDeadNodeCount(getProperty(props, "DeadNodes").getValueAsText(), nn);
return nn;
}
/**
* Get the decommission node information.
* @param statusMap data node status map
* @param props string
*/
private void getDecomNodeInfoForReport(
Map<String, Map<String, String>> statusMap, String props)
throws IOException, MalformedObjectNameException {
getLiveNodeStatus(statusMap, host, getProperty(props, "LiveNodes")
.getValueAsText());
getDeadNodeStatus(statusMap, host, getProperty(props, "DeadNodes")
.getValueAsText());
getDecommissionNodeStatus(statusMap, host,
getProperty(props, "DecomNodes").getValueAsText());
}
/**
* Store the live datanode status information into datanode status map and
* DecommissionNode.
*
* @param statusMap Map of datanode status. Key is datanode, value
* is an inner map whose key is namenode, value is datanode status.
* reported by each namenode.
* @param namenodeHost host name of the namenode
* @param decomnode update DecommissionNode with alive node status
* @param json JSON string contains datanode status
* @throws IOException
*/
private static void getLiveNodeStatus(
Map<String, Map<String, String>> statusMap, String namenodeHost,
String json) throws IOException {
Map<String, Map<String, Object>> nodeMap = getNodeMap(json);
if (nodeMap != null && !nodeMap.isEmpty()) {
List<String> liveDecommed = new ArrayList<String>();
for (Map.Entry<String, Map<String, Object>> entry: nodeMap.entrySet()) {
Map<String, Object> innerMap = entry.getValue();
String dn = entry.getKey();
if (innerMap != null) {
if (innerMap.get("adminState").equals(
AdminStates.DECOMMISSIONED.toString())) {
liveDecommed.add(dn);
}
// the inner map key is namenode, value is datanode status.
Map<String, String> nnStatus = statusMap.get(dn);
if (nnStatus == null) {
nnStatus = new HashMap<String, String>();
}
nnStatus.put(namenodeHost, (String) innerMap.get("adminState"));
// map whose key is datanode, value is the inner map.
statusMap.put(dn, nnStatus);
}
}
}
}
/**
* Store the dead datanode information into datanode status map and
* DecommissionNode.
*
* @param statusMap map with key being datanode, value being an
* inner map (key:namenode, value:decommisionning state).
* @param host datanode hostname
* @param decomnode DecommissionNode
* @param json String
* @throws IOException
*/
private static void getDeadNodeStatus(
Map<String, Map<String, String>> statusMap, String host,
String json) throws IOException {
Map<String, Map<String, Object>> nodeMap = getNodeMap(json);
if (nodeMap == null || nodeMap.isEmpty()) {
return;
}
List<String> deadDn = new ArrayList<String>();
List<String> deadDecommed = new ArrayList<String>();
for (Entry<String, Map<String, Object>> entry : nodeMap.entrySet()) {
deadDn.add(entry.getKey());
Map<String, Object> deadNodeDetailMap = entry.getValue();
String dn = entry.getKey();
if (deadNodeDetailMap != null && !deadNodeDetailMap.isEmpty()) {
// NN - status
Map<String, String> nnStatus = statusMap.get(dn);
if (nnStatus == null) {
nnStatus = new HashMap<String, String>();
}
if (((Boolean) deadNodeDetailMap.get("decommissioned"))
.booleanValue() == true) {
deadDecommed.add(dn);
nnStatus.put(host, AdminStates.DECOMMISSIONED.toString());
} else {
nnStatus.put(host, DEAD);
}
// dn-nn-status
statusMap.put(dn, nnStatus);
}
}
}
/**
* Get the decommisioning datanode information.
*
* @param dataNodeStatusMap map with key being datanode, value being an
* inner map (key:namenode, value:decommisionning state).
* @param host datanode
* @param decomnode DecommissionNode
* @param json String
*/
private static void getDecommissionNodeStatus(
Map<String, Map<String, String>> dataNodeStatusMap, String host,
String json) throws IOException {
Map<String, Map<String, Object>> nodeMap = getNodeMap(json);
if (nodeMap == null || nodeMap.isEmpty()) {
return;
}
List<String> decomming = new ArrayList<String>();
for (Entry<String, Map<String, Object>> entry : nodeMap.entrySet()) {
String dn = entry.getKey();
decomming.add(dn);
// nn-status
Map<String, String> nnStatus = new HashMap<String, String>();
if (dataNodeStatusMap.containsKey(dn)) {
nnStatus = dataNodeStatusMap.get(dn);
}
nnStatus.put(host, AdminStates.DECOMMISSION_INPROGRESS.toString());
// dn-nn-status
dataNodeStatusMap.put(dn, nnStatus);
}
}
}
/**
* This class contains cluster statistics.
*/
static class ClusterStatus {
/** Exception indicates failure to get cluster status */
Exception error = null;
/** Cluster status information */
String clusterid = "";
long total_sum = 0;
long free_sum = 0;
long clusterDfsUsed = 0;
long nonDfsUsed_sum = 0;
long totalFilesAndDirectories = 0;
/** List of namenodes in the cluster */
final List<NamenodeStatus> nnList = new ArrayList<NamenodeStatus>();
/** Map of namenode host and exception encountered when getting status */
final Map<String, Exception> nnExceptions = new HashMap<String, Exception>();
public void setError(Exception e) {
error = e;
}
public void addNamenodeStatus(NamenodeStatus nn) {
nnList.add(nn);
// Add namenode status to cluster status
totalFilesAndDirectories += nn.filesAndDirectories;
total_sum += nn.capacity;
free_sum += nn.free;
clusterDfsUsed += nn.bpUsed;
nonDfsUsed_sum += nn.nonDfsUsed;
}
public void addException(String host, Exception e) {
nnExceptions.put(host, e);
}
public void toXML(XMLOutputter doc) throws IOException {
if (error != null) {
// general exception, only print exception message onto web page.
createGeneralException(doc, clusterid,
StringUtils.stringifyException(error));
doc.getWriter().flush();
return;
}
int size = nnList.size();
long total = 0L, free = 0L, nonDfsUsed = 0l;
float dfsUsedPercent = 0.0f, dfsRemainingPercent = 0.0f;
if (size > 0) {
total = total_sum / size;
free = free_sum / size;
nonDfsUsed = nonDfsUsed_sum / size;
dfsUsedPercent = DFSUtil.getPercentUsed(clusterDfsUsed, total);
dfsRemainingPercent = DFSUtil.getPercentRemaining(free, total);
}
doc.startTag("cluster");
doc.attribute("clusterId", clusterid);
doc.startTag("storage");
toXmlItemBlock(doc, "Total Files And Directories",
Long.toString(totalFilesAndDirectories));
toXmlItemBlock(doc, "Configured Capacity", StringUtils.byteDesc(total));
toXmlItemBlock(doc, "DFS Used", StringUtils.byteDesc(clusterDfsUsed));
toXmlItemBlock(doc, "Non DFS Used", StringUtils.byteDesc(nonDfsUsed));
toXmlItemBlock(doc, "DFS Remaining", StringUtils.byteDesc(free));
// dfsUsedPercent
toXmlItemBlock(doc, "DFS Used%",
StringUtils.limitDecimalTo2(dfsUsedPercent)+ "%");
// dfsRemainingPercent
toXmlItemBlock(doc, "DFS Remaining%",
StringUtils.limitDecimalTo2(dfsRemainingPercent) + "%");
doc.endTag(); // storage
doc.startTag("namenodes");
// number of namenodes
toXmlItemBlock(doc, "NamenodesCount", Integer.toString(size));
for (NamenodeStatus nn : nnList) {
doc.startTag("node");
toXmlItemBlockWithLink(doc, nn.host, nn.httpAddress, "NameNode");
toXmlItemBlock(doc, "Blockpool Used",
StringUtils.byteDesc(nn.bpUsed));
toXmlItemBlock(doc, "Files And Directories",
Long.toString(nn.filesAndDirectories));
toXmlItemBlock(doc, "Blocks", Long.toString(nn.blocksCount));
toXmlItemBlock(doc, "Missing Blocks",
Long.toString(nn.missingBlocksCount));
toXmlItemBlockWithLink(doc, nn.liveDatanodeCount + " (" +
nn.liveDecomCount + ")", nn.httpAddress+"/dfsnodelist.jsp?whatNodes=LIVE",
"Live Datanode (Decommissioned)");
toXmlItemBlockWithLink(doc, nn.deadDatanodeCount + " (" +
nn.deadDecomCount + ")", nn.httpAddress+"/dfsnodelist.jsp?whatNodes=DEAD"
, "Dead Datanode (Decommissioned)");
doc.endTag(); // node
}
doc.endTag(); // namenodes
createNamenodeExceptionMsg(doc, nnExceptions);
doc.endTag(); // cluster
doc.getWriter().flush();
}
}
/**
* This class stores namenode statistics to be used to generate cluster
* web console report.
*/
static class NamenodeStatus {
String host = "";
long capacity = 0L;
long free = 0L;
long bpUsed = 0L;
long nonDfsUsed = 0L;
long filesAndDirectories = 0L;
long blocksCount = 0L;
long missingBlocksCount = 0L;
int liveDatanodeCount = 0;
int liveDecomCount = 0;
int deadDatanodeCount = 0;
int deadDecomCount = 0;
String httpAddress = null;
}
/**
* cluster-wide decommission state of a datanode
*/
public enum DecommissionStates {
/*
* If datanode state is decommissioning at one or more namenodes and
* decommissioned at the rest of the namenodes.
*/
DECOMMISSION_INPROGRESS("Decommission In Progress"),
/* If datanode state at all the namenodes is decommissioned */
DECOMMISSIONED("Decommissioned"),
/*
* If datanode state is not decommissioning at one or more namenodes and
* decommissioned/decommissioning at the rest of the namenodes.
*/
PARTIALLY_DECOMMISSIONED("Partially Decommissioning"),
/*
* If datanode state is not known at a namenode, due to problems in getting
* the datanode state from the namenode.
*/
UNKNOWN("Unknown");
final String value;
DecommissionStates(final String v) {
this.value = v;
}
public String toString() {
return value;
}
}
/**
* This class consolidates the decommissioning datanodes information in the
* cluster and generates decommissioning reports in XML.
*/
static class DecommissionStatus {
/** Error when set indicates failure to get decomission status*/
final Exception error;
/** Map of dn host <-> (Map of NN host <-> decommissioning state) */
final Map<String, Map<String, String>> statusMap;
final String clusterid;
final int httpPort;
int decommissioned = 0; // total number of decommissioned nodes
int decommissioning = 0; // total number of decommissioning datanodes
int partial = 0; // total number of partially decommissioned nodes
/** Map of namenode and exception encountered when getting decom status */
Map<String, Exception> exceptions = new HashMap<String, Exception>();
private DecommissionStatus(Map<String, Map<String, String>> statusMap,
String cid, int httpPort, Map<String, Exception> exceptions) {
this(statusMap, cid, httpPort, exceptions, null);
}
public DecommissionStatus(String cid, Exception e) {
this(null, cid, -1, null, e);
}
private DecommissionStatus(Map<String, Map<String, String>> statusMap,
String cid, int httpPort, Map<String, Exception> exceptions,
Exception error) {
this.statusMap = statusMap;
this.clusterid = cid;
this.httpPort = httpPort;
this.exceptions = exceptions;
this.error = error;
}
/**
* Generate decommissioning datanode report in XML format
*
* @param doc
* , xmloutputter
* @throws IOException
*/
public void toXML(XMLOutputter doc) throws IOException {
if (error != null) {
createGeneralException(doc, clusterid,
StringUtils.stringifyException(error));
doc.getWriter().flush();
return;
}
if (statusMap == null || statusMap.isEmpty()) {
// none of the namenodes has reported, print exceptions from each nn.
doc.startTag("cluster");
createNamenodeExceptionMsg(doc, exceptions);
doc.endTag();
doc.getWriter().flush();
return;
}
doc.startTag("cluster");
doc.attribute("clusterId", clusterid);
doc.startTag("decommissioningReport");
countDecommissionDatanodes();
toXmlItemBlock(doc, DecommissionStates.DECOMMISSIONED.toString(),
Integer.toString(decommissioned));
toXmlItemBlock(doc,
DecommissionStates.DECOMMISSION_INPROGRESS.toString(),
Integer.toString(decommissioning));
toXmlItemBlock(doc,
DecommissionStates.PARTIALLY_DECOMMISSIONED.toString(),
Integer.toString(partial));
doc.endTag(); // decommissioningReport
doc.startTag("datanodes");
Set<String> dnSet = statusMap.keySet();
for (String dnhost : dnSet) {
Map<String, String> nnStatus = statusMap.get(dnhost);
if (nnStatus == null || nnStatus.isEmpty()) {
continue;
}
String overallStatus = nnStatus.get(OVERALL_STATUS);
// check if datanode is in decommission states
if (overallStatus != null
&& (overallStatus.equals(AdminStates.DECOMMISSION_INPROGRESS
.toString())
|| overallStatus.equals(AdminStates.DECOMMISSIONED.toString())
|| overallStatus
.equals(DecommissionStates.PARTIALLY_DECOMMISSIONED
.toString()) || overallStatus
.equals(DecommissionStates.UNKNOWN.toString()))) {
doc.startTag("node");
// dn
toXmlItemBlockWithLink(doc, dnhost, (dnhost+":"+httpPort),"DataNode");
// overall status first
toXmlItemBlock(doc, OVERALL_STATUS, overallStatus);
for (Map.Entry<String, String> m : nnStatus.entrySet()) {
String nn = m.getKey();
if (nn.equals(OVERALL_STATUS)) {
continue;
}
// xml
toXmlItemBlock(doc, nn, nnStatus.get(nn));
}
doc.endTag(); // node
}
}
doc.endTag(); // datanodes
createNamenodeExceptionMsg(doc, exceptions);
doc.endTag();// cluster
} // toXML
/**
* Count the total number of decommissioned/decommission_inprogress/
* partially decommissioned datanodes.
*/
private void countDecommissionDatanodes() {
for (String dn : statusMap.keySet()) {
Map<String, String> nnStatus = statusMap.get(dn);
String status = nnStatus.get(OVERALL_STATUS);
if (status.equals(DecommissionStates.DECOMMISSIONED.toString())) {
decommissioned++;
} else if (status.equals(DecommissionStates.DECOMMISSION_INPROGRESS
.toString())) {
decommissioning++;
} else if (status.equals(DecommissionStates.PARTIALLY_DECOMMISSIONED
.toString())) {
partial++;
}
}
}
}
/**
* Generate a XML block as such, <item label=key value=value/>
*/
private static void toXmlItemBlock(XMLOutputter doc, String key, String value)
throws IOException {
doc.startTag("item");
doc.attribute("label", key);
doc.attribute("value", value);
doc.endTag();
}
/**
* Generate a XML block as such, <item label="Node" value="hostname"
* link="http://hostname:50070" />
*/
private static void toXmlItemBlockWithLink(XMLOutputter doc, String value,
String url, String label) throws IOException {
doc.startTag("item");
doc.attribute("label", label);
doc.attribute("value", value);
doc.attribute("link", "http://" + url);
doc.endTag(); // item
}
/**
* create the XML for exceptions that we encountered when connecting to
* namenode.
*/
private static void createNamenodeExceptionMsg(XMLOutputter doc,
Map<String, Exception> exceptionMsg) throws IOException {
if (exceptionMsg.size() > 0) {
doc.startTag("unreportedNamenodes");
for (Map.Entry<String, Exception> m : exceptionMsg.entrySet()) {
doc.startTag("node");
doc.attribute("name", m.getKey());
doc.attribute("exception",
StringUtils.stringifyException(m.getValue()));
doc.endTag();// node
}
doc.endTag(); // unreportedNamnodes
}
}
/**
* create XML block from general exception.
*/
private static void createGeneralException(XMLOutputter doc,
String clusterid, String eMsg) throws IOException {
doc.startTag("cluster");
doc.attribute("clusterId", clusterid);
doc.startTag("message");
doc.startTag("item");
doc.attribute("msg", eMsg);
doc.endTag(); // item
doc.endTag(); // message
doc.endTag(); // cluster
}
/**
* Read in the content from a URL
* @param url URL To read
* @return the text from the output
* @throws IOException if something went wrong
*/
private static String readOutput(URL url) throws IOException {
StringBuilder out = new StringBuilder();
URLConnection connection = url.openConnection();
BufferedReader in = new BufferedReader(
new InputStreamReader(
connection.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null) {
out.append(inputLine);
}
in.close();
return out.toString();
}
private static String queryMbean(String httpAddress, Configuration conf)
throws IOException {
URL url = new URL("http://"+httpAddress+JMX_QRY);
return readOutput(url);
}
/**
* In order to query a namenode mxbean, a http connection in the form of
* "http://hostname/jmx?qry=Hadoop:service=NameNode,name=NameNodeInfo"
* is sent to namenode. JMX attributes are exposed via JmxJsonServelet on
* the namenode side.
*/
private static JsonNode getProperty(String props, String propertyname)
throws IOException {
if (props == null || props.equals("") || propertyname == null
|| propertyname.equals("")) {
return null;
}
ObjectMapper m = new ObjectMapper();
JsonNode rootNode = m.readValue(props, JsonNode.class);
JsonNode jn = rootNode.get("beans").get(0).get(propertyname);
return jn;
}
}