hadoop JournalNodeSyncer 源码
haddop JournalNodeSyncer 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/server/JournalNodeSyncer.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.hdfs.qjournal.server;
import org.apache.hadoop.classification.VisibleForTesting;
import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSUtilClient;
import org.apache.hadoop.hdfs.protocolPB.PBHelper;
import org.apache.hadoop.hdfs.qjournal.protocol.InterQJournalProtocol;
import org.apache.hadoop.hdfs.qjournal.protocol.QJournalProtocolProtos.GetEditLogManifestResponseProto;
import org.apache.hadoop.hdfs.qjournal.protocolPB.InterQJournalProtocolPB;
import org.apache.hadoop.hdfs.qjournal.protocolPB.InterQJournalProtocolTranslatorPB;
import org.apache.hadoop.hdfs.server.common.Util;
import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
import org.apache.hadoop.hdfs.server.protocol.RemoteEditLog;
import org.apache.hadoop.hdfs.util.DataTransferThrottler;
import org.apache.hadoop.ipc.ProtobufRpcEngine2;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.Daemon;
import org.apache.hadoop.util.Lists;
import org.apache.hadoop.util.Sets;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.security.PrivilegedExceptionAction;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* A Journal Sync thread runs through the lifetime of the JN. It periodically
* gossips with other journal nodes to compare edit log manifests and if it
* detects any missing log segment, it downloads it from the other journal node
*/
@InterfaceAudience.Private
public class JournalNodeSyncer {
public static final Logger LOG = LoggerFactory.getLogger(
JournalNodeSyncer.class);
private final JournalNode jn;
private final Journal journal;
private final String jid;
private String nameServiceId;
private final JNStorage jnStorage;
private final Configuration conf;
private volatile Daemon syncJournalDaemon;
private volatile boolean shouldSync = true;
private List<JournalNodeProxy> otherJNProxies = Lists.newArrayList();
private int numOtherJNs;
private int journalNodeIndexForSync = 0;
private final long journalSyncInterval;
private final int logSegmentTransferTimeout;
private final DataTransferThrottler throttler;
private final JournalMetrics metrics;
private boolean journalSyncerStarted;
JournalNodeSyncer(JournalNode jouranlNode, Journal journal, String jid,
Configuration conf, String nameServiceId) {
this.jn = jouranlNode;
this.journal = journal;
this.jid = jid;
this.nameServiceId = nameServiceId;
this.jnStorage = journal.getStorage();
this.conf = conf;
journalSyncInterval = conf.getLong(
DFSConfigKeys.DFS_JOURNALNODE_SYNC_INTERVAL_KEY,
DFSConfigKeys.DFS_JOURNALNODE_SYNC_INTERVAL_DEFAULT);
logSegmentTransferTimeout = conf.getInt(
DFSConfigKeys.DFS_EDIT_LOG_TRANSFER_TIMEOUT_KEY,
DFSConfigKeys.DFS_EDIT_LOG_TRANSFER_TIMEOUT_DEFAULT);
throttler = getThrottler(conf);
metrics = journal.getMetrics();
journalSyncerStarted = false;
}
void stopSync() {
shouldSync = false;
// Delete the edits.sync directory
File editsSyncDir = journal.getStorage().getEditsSyncDir();
if (editsSyncDir.exists()) {
FileUtil.fullyDelete(editsSyncDir);
}
if (syncJournalDaemon != null) {
syncJournalDaemon.interrupt();
}
}
public void start(String nsId) {
if (nsId != null) {
this.nameServiceId = nsId;
journal.setTriedJournalSyncerStartedwithnsId(true);
}
if (!journalSyncerStarted && getOtherJournalNodeProxies()) {
LOG.info("Starting SyncJournal daemon for journal " + jid);
startSyncJournalsDaemon();
journalSyncerStarted = true;
}
}
public boolean isJournalSyncerStarted() {
return journalSyncerStarted;
}
private boolean createEditsSyncDir() {
File editsSyncDir = journal.getStorage().getEditsSyncDir();
if (editsSyncDir.exists()) {
LOG.info(editsSyncDir + " directory already exists.");
return true;
}
return editsSyncDir.mkdir();
}
private boolean getOtherJournalNodeProxies() {
List<InetSocketAddress> otherJournalNodes = getOtherJournalNodeAddrs();
if (otherJournalNodes == null || otherJournalNodes.isEmpty()) {
LOG.warn("Other JournalNode addresses not available. Journal Syncing " +
"cannot be done");
return false;
}
for (InetSocketAddress addr : otherJournalNodes) {
try {
otherJNProxies.add(new JournalNodeProxy(addr));
} catch (IOException e) {
LOG.warn("Could not add proxy for Journal at addresss " + addr, e);
}
}
// Check if there are any other JournalNodes before starting the sync. Although some proxies
// may be unresolved now, the act of attempting to sync will instigate resolution when the
// servers become available.
if (otherJNProxies.isEmpty()) {
LOG.error("Cannot sync as there is no other JN available for sync.");
return false;
}
numOtherJNs = otherJNProxies.size();
return true;
}
private void startSyncJournalsDaemon() {
syncJournalDaemon = new Daemon(() -> {
// Wait for journal to be formatted to create edits.sync directory
while(!journal.isFormatted()) {
try {
Thread.sleep(journalSyncInterval);
} catch (InterruptedException e) {
LOG.error("JournalNodeSyncer daemon received Runtime exception.", e);
Thread.currentThread().interrupt();
return;
}
}
if (!createEditsSyncDir()) {
LOG.error("Failed to create directory for downloading log " +
"segments: {}. Stopping Journal Node Sync.",
journal.getStorage().getEditsSyncDir());
return;
}
while(shouldSync) {
try {
if (!journal.isFormatted()) {
LOG.warn("Journal cannot sync. Not formatted.");
} else {
syncJournals();
}
} catch (Throwable t) {
if (!shouldSync) {
if (t instanceof InterruptedException) {
LOG.info("Stopping JournalNode Sync.");
Thread.currentThread().interrupt();
return;
} else {
LOG.warn("JournalNodeSyncer received an exception while " +
"shutting down.", t);
}
break;
} else {
if (t instanceof InterruptedException) {
LOG.warn("JournalNodeSyncer interrupted", t);
Thread.currentThread().interrupt();
return;
}
}
LOG.error(
"JournalNodeSyncer daemon received Runtime exception. ", t);
}
try {
Thread.sleep(journalSyncInterval);
} catch (InterruptedException e) {
if (!shouldSync) {
LOG.info("Stopping JournalNode Sync.");
} else {
LOG.warn("JournalNodeSyncer interrupted", e);
}
Thread.currentThread().interrupt();
return;
}
}
});
syncJournalDaemon.start();
}
private void syncJournals() {
syncWithJournalAtIndex(journalNodeIndexForSync);
journalNodeIndexForSync = (journalNodeIndexForSync + 1) % numOtherJNs;
}
private void syncWithJournalAtIndex(int index) {
LOG.info("Syncing Journal " + jn.getBoundIpcAddress().getAddress() + ":"
+ jn.getBoundIpcAddress().getPort() + " with "
+ otherJNProxies.get(index) + ", journal id: " + jid);
final InterQJournalProtocol jnProxy = otherJNProxies.get(index).jnProxy;
if (jnProxy == null) {
LOG.error("JournalNode Proxy not found.");
return;
}
List<RemoteEditLog> thisJournalEditLogs;
try {
thisJournalEditLogs = journal.getEditLogManifest(0, false).getLogs();
} catch (IOException e) {
LOG.error("Exception in getting local edit log manifest", e);
return;
}
GetEditLogManifestResponseProto editLogManifest;
try {
editLogManifest = jnProxy.getEditLogManifestFromJournal(jid,
nameServiceId, 0, false);
} catch (IOException e) {
LOG.debug("Could not sync with Journal at {}.",
otherJNProxies.get(journalNodeIndexForSync), e);
return;
}
getMissingLogSegments(thisJournalEditLogs, editLogManifest,
otherJNProxies.get(index));
}
private List<InetSocketAddress> getOtherJournalNodeAddrs() {
String uriStr = "";
try {
uriStr = conf.getTrimmed(DFSConfigKeys.DFS_NAMENODE_SHARED_EDITS_DIR_KEY);
if (uriStr == null || uriStr.isEmpty()) {
if (nameServiceId != null) {
uriStr = conf.getTrimmed(DFSConfigKeys
.DFS_NAMENODE_SHARED_EDITS_DIR_KEY + "." + nameServiceId);
}
}
if (uriStr == null || uriStr.isEmpty()) {
HashSet<String> sharedEditsUri = new HashSet<>();
if (nameServiceId != null) {
Collection<String> nnIds = DFSUtilClient.getNameNodeIds(
conf, nameServiceId);
for (String nnId : nnIds) {
String suffix = nameServiceId + "." + nnId;
uriStr = conf.getTrimmed(DFSConfigKeys
.DFS_NAMENODE_SHARED_EDITS_DIR_KEY + "." + suffix);
sharedEditsUri.add(uriStr);
}
if (sharedEditsUri.size() > 1) {
uriStr = null;
LOG.error("The conf property " + DFSConfigKeys
.DFS_NAMENODE_SHARED_EDITS_DIR_KEY + " not set properly, " +
"it has been configured with different journalnode values " +
sharedEditsUri.toString() + " for a" +
" single nameserviceId" + nameServiceId);
}
}
}
if (uriStr == null || uriStr.isEmpty()) {
LOG.error("Could not construct Shared Edits Uri");
return null;
} else {
return getJournalAddrList(uriStr);
}
} catch (URISyntaxException e) {
LOG.error("The conf property " + DFSConfigKeys
.DFS_NAMENODE_SHARED_EDITS_DIR_KEY + " not set properly.");
} catch (IOException e) {
LOG.error("Could not parse JournalNode addresses: " + uriStr);
}
return null;
}
@VisibleForTesting
protected List<InetSocketAddress> getJournalAddrList(String uriStr) throws
URISyntaxException,
IOException {
URI uri = new URI(uriStr);
InetSocketAddress boundIpcAddress = jn.getBoundIpcAddress();
Set<InetSocketAddress> excluded = Sets.newHashSet(boundIpcAddress);
List<InetSocketAddress> addrList = Util.getLoggerAddresses(uri, excluded, conf);
// Exclude the current JournalNode instance (a local address and the same port). If the address
// is bound to a local address on the same port, then remove it to handle scenarios where a
// wildcard address (e.g. "0.0.0.0") is used. We can't simply exclude all local addresses
// since we may be running multiple servers on the same host.
addrList.removeIf(addr -> !addr.isUnresolved() && addr.getAddress().isAnyLocalAddress()
&& boundIpcAddress.getPort() == addr.getPort());
return addrList;
}
private void getMissingLogSegments(List<RemoteEditLog> thisJournalEditLogs,
GetEditLogManifestResponseProto response,
JournalNodeProxy remoteJNproxy) {
List<RemoteEditLog> otherJournalEditLogs = PBHelper.convert(
response.getManifest()).getLogs();
if (otherJournalEditLogs == null || otherJournalEditLogs.isEmpty()) {
LOG.warn("Journal at " + remoteJNproxy.jnAddr + " has no edit logs");
return;
}
List<RemoteEditLog> missingLogs = getMissingLogList(thisJournalEditLogs,
otherJournalEditLogs);
if (!missingLogs.isEmpty()) {
NamespaceInfo nsInfo = jnStorage.getNamespaceInfo();
for (RemoteEditLog missingLog : missingLogs) {
URL url = null;
boolean success = false;
try {
if (remoteJNproxy.httpServerUrl == null) {
if (response.hasFromURL()) {
remoteJNproxy.httpServerUrl = getHttpServerURI(
response.getFromURL(), remoteJNproxy.jnAddr.getHostName());
} else {
LOG.error("EditLogManifest response does not have fromUrl " +
"field set. Aborting current sync attempt");
break;
}
}
String urlPath = GetJournalEditServlet.buildPath(jid, missingLog
.getStartTxId(), nsInfo, false);
url = new URL(remoteJNproxy.httpServerUrl, urlPath);
success = downloadMissingLogSegment(url, missingLog);
} catch (URISyntaxException e) {
LOG.error("EditLogManifest's fromUrl field syntax incorrect", e);
} catch (MalformedURLException e) {
LOG.error("MalformedURL when download missing log segment", e);
} catch (Exception e) {
LOG.error("Exception in downloading missing log segment from url " +
url, e);
}
if (!success) {
LOG.error("Aborting current sync attempt.");
break;
}
}
}
}
/**
* Returns the logs present in otherJournalEditLogs and missing from
* thisJournalEditLogs.
*/
private List<RemoteEditLog> getMissingLogList(
List<RemoteEditLog> thisJournalEditLogs,
List<RemoteEditLog> otherJournalEditLogs) {
if (thisJournalEditLogs.isEmpty()) {
return otherJournalEditLogs;
}
List<RemoteEditLog> missingEditLogs = Lists.newArrayList();
int localJnIndex = 0, remoteJnIndex = 0;
int localJnNumLogs = thisJournalEditLogs.size();
int remoteJnNumLogs = otherJournalEditLogs.size();
while (localJnIndex < localJnNumLogs && remoteJnIndex < remoteJnNumLogs) {
long localJNstartTxId = thisJournalEditLogs.get(localJnIndex)
.getStartTxId();
long remoteJNstartTxId = otherJournalEditLogs.get(remoteJnIndex)
.getStartTxId();
if (localJNstartTxId == remoteJNstartTxId) {
localJnIndex++;
remoteJnIndex++;
} else if (localJNstartTxId > remoteJNstartTxId) {
missingEditLogs.add(otherJournalEditLogs.get(remoteJnIndex));
remoteJnIndex++;
} else {
localJnIndex++;
}
}
if (remoteJnIndex < remoteJnNumLogs) {
for (; remoteJnIndex < remoteJnNumLogs; remoteJnIndex++) {
missingEditLogs.add(otherJournalEditLogs.get(remoteJnIndex));
}
}
return missingEditLogs;
}
private URL getHttpServerURI(String fromUrl, String hostAddr)
throws URISyntaxException, MalformedURLException {
URI uri = new URI(fromUrl);
return new URL(uri.getScheme(), hostAddr, uri.getPort(), "");
}
/**
* Transfer an edit log from one journal node to another for sync-up.
*/
private boolean downloadMissingLogSegment(URL url, RemoteEditLog log)
throws IOException {
LOG.info("Downloading missing Edit Log from " + url + " to " + jnStorage
.getRoot());
assert log.getStartTxId() > 0 && log.getEndTxId() > 0 : "bad log: " + log;
File finalEditsFile = jnStorage.getFinalizedEditsFile(log.getStartTxId(),
log.getEndTxId());
if (finalEditsFile.exists() && FileUtil.canRead(finalEditsFile)) {
LOG.info("Skipping download of remote edit log " + log + " since it's" +
" already stored locally at " + finalEditsFile);
return true;
}
// Download the log segment to current.tmp directory first.
File tmpEditsFile = jnStorage.getTemporaryEditsFile(
log.getStartTxId(), log.getEndTxId());
if (!SecurityUtil.doAsLoginUser(() -> {
if (UserGroupInformation.isSecurityEnabled()) {
UserGroupInformation.getCurrentUser().checkTGTAndReloginFromKeytab();
}
try {
Util.doGetUrl(url, ImmutableList.of(tmpEditsFile), jnStorage, false,
logSegmentTransferTimeout, throttler);
} catch (IOException e) {
LOG.error("Download of Edit Log file for Syncing failed. Deleting temp "
+ "file: " + tmpEditsFile, e);
if (!tmpEditsFile.delete()) {
LOG.warn("Deleting " + tmpEditsFile + " has failed");
}
return false;
}
return true;
})) {
return false;
}
LOG.info("Downloaded file " + tmpEditsFile.getName() + " of size " +
tmpEditsFile.length() + " bytes.");
boolean moveSuccess = false;
try {
moveSuccess = journal.moveTmpSegmentToCurrent(tmpEditsFile,
finalEditsFile, log.getEndTxId());
} catch (IOException e) {
LOG.info("Could not move {} to current directory.", tmpEditsFile);
} finally {
if (tmpEditsFile.exists() && !tmpEditsFile.delete()) {
LOG.warn("Deleting " + tmpEditsFile + " has failed");
}
}
if (moveSuccess) {
metrics.incrNumEditLogsSynced();
return true;
} else {
return false;
}
}
private static DataTransferThrottler getThrottler(Configuration conf) {
long transferBandwidth =
conf.getLong(DFSConfigKeys.DFS_EDIT_LOG_TRANSFER_RATE_KEY,
DFSConfigKeys.DFS_EDIT_LOG_TRANSFER_RATE_DEFAULT);
DataTransferThrottler throttler = null;
if (transferBandwidth > 0) {
throttler = new DataTransferThrottler(transferBandwidth);
}
return throttler;
}
private class JournalNodeProxy {
private final InetSocketAddress jnAddr;
private final InterQJournalProtocol jnProxy;
private URL httpServerUrl;
JournalNodeProxy(InetSocketAddress jnAddr) throws IOException {
final Configuration confCopy = new Configuration(conf);
this.jnAddr = jnAddr;
this.jnProxy = SecurityUtil.doAsLoginUser(
new PrivilegedExceptionAction<InterQJournalProtocol>() {
@Override
public InterQJournalProtocol run() throws IOException {
RPC.setProtocolEngine(confCopy, InterQJournalProtocolPB.class,
ProtobufRpcEngine2.class);
InterQJournalProtocolPB interQJournalProtocolPB = RPC.getProxy(
InterQJournalProtocolPB.class,
RPC.getProtocolVersion(InterQJournalProtocolPB.class),
jnAddr, confCopy);
return new InterQJournalProtocolTranslatorPB(
interQJournalProtocolPB);
}
});
}
@Override
public String toString() {
return jnAddr.toString();
}
}
}
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