hadoop NodesListManager 源码
haddop NodesListManager 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/NodesListManager.java
/**
* 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.yarn.server.resourcemanager;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.ConcurrentHashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.net.Node;
import org.apache.hadoop.service.AbstractService;
import org.apache.hadoop.service.CompositeService;
import org.apache.hadoop.util.HostsFileReader;
import org.apache.hadoop.util.HostsFileReader.HostDetails;
import org.apache.hadoop.util.Time;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.yarn.api.records.NodeId;
import org.apache.hadoop.yarn.api.records.NodeState;
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.event.EventHandler;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMApp;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppNodeUpdateEvent;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppNodeUpdateEvent.RMAppNodeUpdateType;
import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeDecommissioningEvent;
import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeEvent;
import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeEventType;
import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl;
import org.apache.hadoop.yarn.util.Clock;
import org.apache.hadoop.yarn.util.SystemClock;
import org.apache.hadoop.classification.VisibleForTesting;
@SuppressWarnings("unchecked")
public class NodesListManager extends CompositeService implements
EventHandler<NodesListManagerEvent> {
private static final Logger LOG =
LoggerFactory.getLogger(NodesListManager.class);
private HostsFileReader hostsReader;
private Configuration conf;
private final RMContext rmContext;
// Default decommissioning timeout value in seconds.
// Negative value indicates no timeout. 0 means immediate.
private int defaultDecTimeoutSecs =
YarnConfiguration.DEFAULT_RM_NODE_GRACEFUL_DECOMMISSION_TIMEOUT;
private String includesFile;
private String excludesFile;
private Resolver resolver;
private Timer removalTimer;
private int nodeRemovalCheckInterval;
private Set<RMNode> gracefulDecommissionableNodes;
private boolean enableNodeUntrackedWithoutIncludePath;
public NodesListManager(RMContext rmContext) {
super(NodesListManager.class.getName());
this.rmContext = rmContext;
this.gracefulDecommissionableNodes = ConcurrentHashMap.newKeySet();
}
@Override
protected void serviceInit(Configuration conf) throws Exception {
this.conf = conf;
int nodeIpCacheTimeout = conf.getInt(
YarnConfiguration.RM_NODE_IP_CACHE_EXPIRY_INTERVAL_SECS,
YarnConfiguration.DEFAULT_RM_NODE_IP_CACHE_EXPIRY_INTERVAL_SECS);
if (nodeIpCacheTimeout <= 0) {
resolver = new DirectResolver();
} else {
resolver =
new CachedResolver(SystemClock.getInstance(), nodeIpCacheTimeout);
addIfService(resolver);
}
// Read the hosts/exclude files to restrict access to the RM
try {
this.includesFile = conf.get(YarnConfiguration.RM_NODES_INCLUDE_FILE_PATH,
YarnConfiguration.DEFAULT_RM_NODES_INCLUDE_FILE_PATH);
this.excludesFile = conf.get(YarnConfiguration.RM_NODES_EXCLUDE_FILE_PATH,
YarnConfiguration.DEFAULT_RM_NODES_EXCLUDE_FILE_PATH);
this.hostsReader =
createHostsFileReader(this.includesFile, this.excludesFile);
setDecommissionedNMs();
printConfiguredHosts(false);
} catch (YarnException ex) {
disableHostsFileReader(ex);
} catch (IOException ioe) {
disableHostsFileReader(ioe);
}
enableNodeUntrackedWithoutIncludePath = conf.getBoolean(
YarnConfiguration.RM_ENABLE_NODE_UNTRACKED_WITHOUT_INCLUDE_PATH,
YarnConfiguration.DEFAULT_RM_ENABLE_NODE_UNTRACKED_WITHOUT_INCLUDE_PATH);
final int nodeRemovalTimeout =
conf.getInt(
YarnConfiguration.RM_NODEMANAGER_UNTRACKED_REMOVAL_TIMEOUT_MSEC,
YarnConfiguration.
DEFAULT_RM_NODEMANAGER_UNTRACKED_REMOVAL_TIMEOUT_MSEC);
nodeRemovalCheckInterval = (Math.min(nodeRemovalTimeout/2,
600000));
removalTimer = new Timer("Node Removal Timer");
removalTimer.schedule(new TimerTask() {
@Override
public void run() {
long now = Time.monotonicNow();
for (Map.Entry<NodeId, RMNode> entry :
rmContext.getInactiveRMNodes().entrySet()) {
NodeId nodeId = entry.getKey();
RMNode rmNode = entry.getValue();
if (isUntrackedNode(rmNode.getHostName())) {
if (rmNode.getUntrackedTimeStamp() == 0) {
rmNode.setUntrackedTimeStamp(now);
} else
if (now - rmNode.getUntrackedTimeStamp() >
nodeRemovalTimeout) {
RMNode result = rmContext.getInactiveRMNodes().remove(nodeId);
if (result != null) {
decrInactiveNMMetrics(rmNode);
LOG.info("Removed " +result.getState().toString() + " node "
+ result.getHostName() + " from inactive nodes list");
}
}
} else {
rmNode.setUntrackedTimeStamp(0);
}
}
}
}, nodeRemovalCheckInterval, nodeRemovalCheckInterval);
super.serviceInit(conf);
}
private void decrInactiveNMMetrics(RMNode rmNode) {
ClusterMetrics clusterMetrics = ClusterMetrics.getMetrics();
switch (rmNode.getState()) {
case SHUTDOWN:
clusterMetrics.decrNumShutdownNMs();
break;
case DECOMMISSIONED:
clusterMetrics.decrDecommisionedNMs();
break;
case LOST:
clusterMetrics.decrNumLostNMs();
break;
case REBOOTED:
clusterMetrics.decrNumRebootedNMs();
break;
default:
LOG.debug("Unexpected node state");
}
}
@Override
public void serviceStop() {
removalTimer.cancel();
}
private void printConfiguredHosts(boolean graceful) {
if (!LOG.isDebugEnabled()) {
return;
}
LOG.debug("hostsReader: in=" +
conf.get(YarnConfiguration.RM_NODES_INCLUDE_FILE_PATH,
YarnConfiguration.DEFAULT_RM_NODES_INCLUDE_FILE_PATH) + " out=" +
conf.get(YarnConfiguration.RM_NODES_EXCLUDE_FILE_PATH,
YarnConfiguration.DEFAULT_RM_NODES_EXCLUDE_FILE_PATH));
HostDetails hostDetails;
if (graceful) {
hostDetails = hostsReader.getLazyLoadedHostDetails();
} else {
hostDetails = hostsReader.getHostDetails();
}
for (String include : hostDetails.getIncludedHosts()) {
LOG.debug("include: " + include);
}
for (String exclude : hostDetails.getExcludedHosts()) {
LOG.debug("exclude: " + exclude);
}
}
public void refreshNodes(Configuration yarnConf)
throws IOException, YarnException {
refreshNodes(yarnConf, false);
}
public void refreshNodes(Configuration yarnConf, boolean graceful)
throws IOException, YarnException {
refreshHostsReader(yarnConf, graceful, null);
}
private void refreshHostsReader(
Configuration yarnConf, boolean graceful, Integer timeout)
throws IOException, YarnException {
// resolve the default timeout to the decommission timeout that is
// configured at this moment
if (null == timeout) {
timeout = readDecommissioningTimeout(yarnConf);
}
if (null == yarnConf) {
yarnConf = new YarnConfiguration();
}
includesFile =
yarnConf.get(YarnConfiguration.RM_NODES_INCLUDE_FILE_PATH,
YarnConfiguration.DEFAULT_RM_NODES_INCLUDE_FILE_PATH);
excludesFile =
yarnConf.get(YarnConfiguration.RM_NODES_EXCLUDE_FILE_PATH,
YarnConfiguration.DEFAULT_RM_NODES_EXCLUDE_FILE_PATH);
LOG.info("refreshNodes excludesFile " + excludesFile);
if (graceful) {
// update hosts, but don't make it visible just yet
hostsReader.lazyRefresh(includesFile, excludesFile);
} else {
hostsReader.refresh(includesFile, excludesFile);
}
printConfiguredHosts(graceful);
LOG.info("hostsReader include:{" +
StringUtils.join(",", hostsReader.getHosts()) +
"} exclude:{" +
StringUtils.join(",", hostsReader.getExcludedHosts()) + "}");
handleExcludeNodeList(graceful, timeout);
}
private void setDecommissionedNMs() {
Set<String> excludeList = hostsReader.getExcludedHosts();
for (final String host : excludeList) {
NodeId nodeId = createUnknownNodeId(host);
RMNodeImpl rmNode = new RMNodeImpl(nodeId,
rmContext, host, -1, -1, new UnknownNode(host),
Resource.newInstance(0, 0), "unknown");
rmContext.getInactiveRMNodes().put(nodeId, rmNode);
rmNode.handle(new RMNodeEvent(nodeId, RMNodeEventType.DECOMMISSION));
}
}
// Handle excluded nodes based on following rules:
// Recommission DECOMMISSIONED or DECOMMISSIONING nodes no longer excluded;
// Gracefully decommission excluded nodes that are not already
// DECOMMISSIONED nor DECOMMISSIONING; Take no action for excluded nodes
// that are already DECOMMISSIONED or DECOMMISSIONING.
private void handleExcludeNodeList(boolean graceful, int timeout) {
// DECOMMISSIONED/DECOMMISSIONING nodes need to be re-commissioned.
List<RMNode> nodesToRecom = new ArrayList<RMNode>();
// Nodes need to be decommissioned (graceful or forceful);
List<RMNode> nodesToDecom = new ArrayList<RMNode>();
HostDetails hostDetails;
gracefulDecommissionableNodes.clear();
if (graceful) {
hostDetails = hostsReader.getLazyLoadedHostDetails();
} else {
hostDetails = hostsReader.getHostDetails();
}
Set<String> includes = hostDetails.getIncludedHosts();
Map<String, Integer> excludes = hostDetails.getExcludedMap();
for (RMNode n : this.rmContext.getRMNodes().values()) {
NodeState s = n.getState();
// An invalid node (either due to explicit exclude or not include)
// should be excluded.
boolean isExcluded = !isValidNode(
n.getHostName(), includes, excludes.keySet());
String nodeStr = "node " + n.getNodeID() + " with state " + s;
if (!isExcluded) {
// Note that no action is needed for DECOMMISSIONED node.
if (s == NodeState.DECOMMISSIONING) {
LOG.info("Recommission " + nodeStr);
nodesToRecom.add(n);
}
// Otherwise no-action needed.
} else {
// exclude is true.
if (graceful) {
// Use per node timeout if exist otherwise the request timeout.
Integer timeoutToUse = (excludes.get(n.getHostName()) != null)?
excludes.get(n.getHostName()) : timeout;
if (s != NodeState.DECOMMISSIONED &&
s != NodeState.DECOMMISSIONING) {
LOG.info("Gracefully decommission " + nodeStr);
nodesToDecom.add(n);
gracefulDecommissionableNodes.add(n);
} else if (s == NodeState.DECOMMISSIONING &&
!Objects.equals(n.getDecommissioningTimeout(),
timeoutToUse)) {
LOG.info("Update " + nodeStr + " timeout to be " + timeoutToUse);
nodesToDecom.add(n);
gracefulDecommissionableNodes.add(n);
} else {
LOG.info("No action for " + nodeStr);
}
} else {
if (s != NodeState.DECOMMISSIONED) {
LOG.info("Forcefully decommission " + nodeStr);
nodesToDecom.add(n);
}
}
}
}
if (graceful) {
hostsReader.finishRefresh();
}
for (RMNode n : nodesToRecom) {
RMNodeEvent e = new RMNodeEvent(
n.getNodeID(), RMNodeEventType.RECOMMISSION);
this.rmContext.getDispatcher().getEventHandler().handle(e);
}
for (RMNode n : nodesToDecom) {
RMNodeEvent e;
if (graceful) {
Integer timeoutToUse = (excludes.get(n.getHostName()) != null)?
excludes.get(n.getHostName()) : timeout;
e = new RMNodeDecommissioningEvent(n.getNodeID(), timeoutToUse);
} else {
RMNodeEventType eventType = isUntrackedNode(n.getHostName())?
RMNodeEventType.SHUTDOWN : RMNodeEventType.DECOMMISSION;
e = new RMNodeEvent(n.getNodeID(), eventType);
}
this.rmContext.getDispatcher().getEventHandler().handle(e);
}
updateInactiveNodes();
}
@VisibleForTesting
public int getNodeRemovalCheckInterval() {
return nodeRemovalCheckInterval;
}
@VisibleForTesting
public void setNodeRemovalCheckInterval(int interval) {
this.nodeRemovalCheckInterval = interval;
}
@VisibleForTesting
public Resolver getResolver() {
return resolver;
}
@VisibleForTesting
public interface Resolver {
// try to resolve hostName to IP address, fallback to hostName if failed
String resolve(String hostName);
}
@VisibleForTesting
public static class DirectResolver implements Resolver {
@Override
public String resolve(String hostName) {
return NetUtils.normalizeHostName(hostName);
}
}
@VisibleForTesting
public static class CachedResolver extends AbstractService
implements Resolver {
private static class CacheEntry {
public String ip;
public long resolveTime;
public CacheEntry(String ip, long resolveTime) {
this.ip = ip;
this.resolveTime = resolveTime;
}
}
private Map<String, CacheEntry> cache =
new ConcurrentHashMap<String, CacheEntry>();
private int expiryIntervalMs;
private int checkIntervalMs;
private final Clock clock;
private Timer checkingTimer;
private TimerTask expireChecker = new ExpireChecker();
public CachedResolver(Clock clock, int expiryIntervalSecs) {
super("NodesListManager.CachedResolver");
this.clock = clock;
this.expiryIntervalMs = expiryIntervalSecs * 1000;
checkIntervalMs = expiryIntervalMs/3;
checkingTimer = new Timer(
"Timer-NodesListManager.CachedResolver.ExpireChecker", true);
}
@Override
protected void serviceStart() throws Exception {
checkingTimer.scheduleAtFixedRate(
expireChecker, checkIntervalMs, checkIntervalMs);
super.serviceStart();
}
@Override
protected void serviceStop() throws Exception {
checkingTimer.cancel();
super.serviceStop();
}
@VisibleForTesting
public void addToCache(String hostName, String ip) {
cache.put(hostName, new CacheEntry(ip, clock.getTime()));
}
public void removeFromCache(String hostName) {
cache.remove(hostName);
}
private String reload(String hostName) {
String ip = NetUtils.normalizeHostName(hostName);
addToCache(hostName, ip);
return ip;
}
@Override
public String resolve(String hostName) {
CacheEntry e = cache.get(hostName);
if (e != null) {
return e.ip;
}
return reload(hostName);
}
@VisibleForTesting
public TimerTask getExpireChecker() {
return expireChecker;
}
private class ExpireChecker extends TimerTask {
@Override
public void run() {
long currentTime = clock.getTime();
Iterator<Map.Entry<String, CacheEntry>> iterator =
cache.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry<String, CacheEntry> entry = iterator.next();
if (currentTime >
entry.getValue().resolveTime +
CachedResolver.this.expiryIntervalMs) {
iterator.remove();
if (LOG.isDebugEnabled()) {
LOG.debug("[" + entry.getKey() + ":" + entry.getValue().ip +
"] Expired after " +
CachedResolver.this.expiryIntervalMs / 1000 + " secs");
}
}
}
}
}
}
public boolean isValidNode(String hostName) {
HostDetails hostDetails = hostsReader.getHostDetails();
return isValidNode(hostName, hostDetails.getIncludedHosts(),
hostDetails.getExcludedHosts());
}
boolean isGracefullyDecommissionableNode(RMNode node) {
return gracefulDecommissionableNodes.contains(node);
}
private boolean isValidNode(
String hostName, Set<String> hostsList, Set<String> excludeList) {
String ip = resolver.resolve(hostName);
return (hostsList.isEmpty() || hostsList.contains(hostName) || hostsList
.contains(ip))
&& !(excludeList.contains(hostName) || excludeList.contains(ip));
}
private void sendRMAppNodeUpdateEventToNonFinalizedApps(
RMNode eventNode, RMAppNodeUpdateType appNodeUpdateType) {
for(RMApp app : rmContext.getRMApps().values()) {
if (!app.isAppFinalStateStored()) {
app.handle(new RMAppNodeUpdateEvent(app.getApplicationId(), eventNode,
appNodeUpdateType));
}
}
}
@Override
public void handle(NodesListManagerEvent event) {
RMNode eventNode = event.getNode();
switch (event.getType()) {
case NODE_UNUSABLE:
LOG.debug("{} reported unusable", eventNode);
sendRMAppNodeUpdateEventToNonFinalizedApps(eventNode,
RMAppNodeUpdateType.NODE_UNUSABLE);
break;
case NODE_USABLE:
LOG.debug("{} reported usable", eventNode);
sendRMAppNodeUpdateEventToNonFinalizedApps(eventNode,
RMAppNodeUpdateType.NODE_USABLE);
break;
case NODE_DECOMMISSIONING:
LOG.debug("{} reported decommissioning", eventNode);
sendRMAppNodeUpdateEventToNonFinalizedApps(
eventNode, RMAppNodeUpdateType.NODE_DECOMMISSIONING);
break;
default:
LOG.error("Ignoring invalid eventtype " + event.getType());
}
// remove the cache of normalized hostname if enabled
if (resolver instanceof CachedResolver) {
((CachedResolver)resolver).removeFromCache(
eventNode.getNodeID().getHost());
}
}
private void disableHostsFileReader(Exception ex) {
LOG.warn("Failed to init hostsReader, disabling", ex);
try {
this.includesFile =
conf.get(YarnConfiguration.DEFAULT_RM_NODES_INCLUDE_FILE_PATH);
this.excludesFile =
conf.get(YarnConfiguration.DEFAULT_RM_NODES_EXCLUDE_FILE_PATH);
this.hostsReader =
createHostsFileReader(this.includesFile, this.excludesFile);
setDecommissionedNMs();
} catch (IOException ioe2) {
// Should *never* happen
this.hostsReader = null;
throw new YarnRuntimeException(ioe2);
} catch (YarnException e) {
// Should *never* happen
this.hostsReader = null;
throw new YarnRuntimeException(e);
}
}
@VisibleForTesting
public HostsFileReader getHostsReader() {
return this.hostsReader;
}
private HostsFileReader createHostsFileReader(String includesFile,
String excludesFile) throws IOException, YarnException {
HostsFileReader hostsReader =
new HostsFileReader(includesFile,
(includesFile == null || includesFile.isEmpty()) ? null
: this.rmContext.getConfigurationProvider()
.getConfigurationInputStream(this.conf, includesFile),
excludesFile,
(excludesFile == null || excludesFile.isEmpty()) ? null
: this.rmContext.getConfigurationProvider()
.getConfigurationInputStream(this.conf, excludesFile));
return hostsReader;
}
private void updateInactiveNodes() {
long now = Time.monotonicNow();
for(Entry<NodeId, RMNode> entry :
rmContext.getInactiveRMNodes().entrySet()) {
NodeId nodeId = entry.getKey();
RMNode rmNode = entry.getValue();
if (isUntrackedNode(nodeId.getHost()) &&
rmNode.getUntrackedTimeStamp() == 0) {
rmNode.setUntrackedTimeStamp(now);
}
}
}
public boolean isUntrackedNode(String hostName) {
String ip = resolver.resolve(hostName);
HostDetails hostDetails = hostsReader.getHostDetails();
Set<String> hostsList = hostDetails.getIncludedHosts();
Set<String> excludeList = hostDetails.getExcludedHosts();
return (!hostsList.isEmpty() || (enableNodeUntrackedWithoutIncludePath
&& (hostDetails.getIncludesFile() == null
|| hostDetails.getIncludesFile().isEmpty())))
&& !hostsList.contains(hostName)
&& !hostsList.contains(ip) && !excludeList.contains(hostName)
&& !excludeList.contains(ip);
}
/**
* Refresh the nodes gracefully
*
* @param yarnConf
* @param timeout decommission timeout, null means default timeout.
* @throws IOException
* @throws YarnException
*/
public void refreshNodesGracefully(Configuration yarnConf, Integer timeout)
throws IOException, YarnException {
refreshHostsReader(yarnConf, true, timeout);
}
/**
* It checks for any nodes in decommissioning state
*
* @return decommissioning nodes
*/
public Set<NodeId> checkForDecommissioningNodes() {
Set<NodeId> decommissioningNodes = new HashSet<NodeId>();
for (Entry<NodeId, RMNode> entry : rmContext.getRMNodes().entrySet()) {
if (entry.getValue().getState() == NodeState.DECOMMISSIONING) {
decommissioningNodes.add(entry.getKey());
}
}
return decommissioningNodes;
}
/**
* Forcefully decommission the nodes if they are in DECOMMISSIONING state
*/
public void refreshNodesForcefully() {
for (Entry<NodeId, RMNode> entry : rmContext.getRMNodes().entrySet()) {
if (entry.getValue().getState() == NodeState.DECOMMISSIONING) {
RMNodeEventType nodeEventType =
isUntrackedNode(entry.getKey().getHost()) ?
RMNodeEventType.SHUTDOWN : RMNodeEventType.DECOMMISSION;
this.rmContext.getDispatcher().getEventHandler().handle(
new RMNodeEvent(entry.getKey(), nodeEventType));
}
}
}
// Read possible new DECOMMISSIONING_TIMEOUT_KEY from yarn-site.xml.
// This enables NodesListManager to pick up new value without
// ResourceManager restart.
private int readDecommissioningTimeout(Configuration pConf) {
try {
if (pConf == null) {
pConf = new YarnConfiguration();
}
int configuredDefaultDecTimeoutSecs =
pConf.getInt(YarnConfiguration.RM_NODE_GRACEFUL_DECOMMISSION_TIMEOUT,
YarnConfiguration.DEFAULT_RM_NODE_GRACEFUL_DECOMMISSION_TIMEOUT);
if (defaultDecTimeoutSecs != configuredDefaultDecTimeoutSecs) {
defaultDecTimeoutSecs = configuredDefaultDecTimeoutSecs;
LOG.info("Use new decommissioningTimeoutSecs: "
+ defaultDecTimeoutSecs);
}
} catch (Exception e) {
LOG.warn("Error readDecommissioningTimeout " + e.getMessage());
}
return defaultDecTimeoutSecs;
}
/**
* A NodeId instance needed upon startup for populating inactive nodes Map.
* It only knows the hostname/ip and marks the port to -1 or invalid.
*/
public static NodeId createUnknownNodeId(String host) {
return NodeId.newInstance(host, -1);
}
/**
* A Node instance needed upon startup for populating inactive nodes Map.
* It only knows its hostname/ip.
*/
private static class UnknownNode implements Node {
private String host;
public UnknownNode(String host) {
this.host = host;
}
@Override
public String getNetworkLocation() {
return null;
}
@Override
public void setNetworkLocation(String location) {
}
@Override
public String getName() {
return host;
}
@Override
public Node getParent() {
return null;
}
@Override
public void setParent(Node parent) {
}
@Override
public int getLevel() {
return 0;
}
@Override
public void setLevel(int i) {
}
public String getHost() {
return host;
}
public void setHost(String hst) {
this.host = hst;
}
}
}
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