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/**
* 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.mapred;
import static org.fusesource.leveldbjni.JniDBFactory.asString;
import static org.fusesource.leveldbjni.JniDBFactory.bytes;
import static org.jboss.netty.buffer.ChannelBuffers.wrappedBuffer;
import static org.jboss.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
import static org.jboss.netty.handler.codec.http.HttpMethod.GET;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.INTERNAL_SERVER_ERROR;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.METHOD_NOT_ALLOWED;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.OK;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.UNAUTHORIZED;
import static org.jboss.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.net.InetSocketAddress;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.regex.Pattern;
import javax.crypto.SecretKey;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.DataInputByteBuffer;
import org.apache.hadoop.io.DataOutputBuffer;
import org.apache.hadoop.io.ReadaheadPool;
import org.apache.hadoop.io.SecureIOUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.proto.ShuffleHandlerRecoveryProtos.JobShuffleInfoProto;
import org.apache.hadoop.mapreduce.MRConfig;
import org.apache.hadoop.mapreduce.security.SecureShuffleUtils;
import org.apache.hadoop.mapreduce.security.token.JobTokenIdentifier;
import org.apache.hadoop.mapreduce.security.token.JobTokenSecretManager;
import org.apache.hadoop.mapreduce.task.reduce.ShuffleHeader;
import org.apache.hadoop.metrics2.MetricsSystem;
import org.apache.hadoop.metrics2.annotation.Metric;
import org.apache.hadoop.metrics2.annotation.Metrics;
import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
import org.apache.hadoop.metrics2.lib.MutableCounterInt;
import org.apache.hadoop.metrics2.lib.MutableCounterLong;
import org.apache.hadoop.metrics2.lib.MutableGaugeInt;
import org.apache.hadoop.security.proto.SecurityProtos.TokenProto;
import org.apache.hadoop.security.ssl.SSLFactory;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.util.DiskChecker;
import org.apache.hadoop.util.Shell;
import org.apache.hadoop.util.concurrent.HadoopExecutors;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.proto.YarnServerCommonProtos.VersionProto;
import org.apache.hadoop.yarn.server.api.ApplicationInitializationContext;
import org.apache.hadoop.yarn.server.api.ApplicationTerminationContext;
import org.apache.hadoop.yarn.server.api.AuxiliaryService;
import org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer;
import org.apache.hadoop.yarn.server.records.Version;
import org.apache.hadoop.yarn.server.records.impl.pb.VersionPBImpl;
import org.apache.hadoop.yarn.server.utils.LeveldbIterator;
import org.fusesource.leveldbjni.JniDBFactory;
import org.fusesource.leveldbjni.internal.NativeDB;
import org.iq80.leveldb.DB;
import org.iq80.leveldb.DBException;
import org.iq80.leveldb.Options;
import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelHandler;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
import org.jboss.netty.channel.group.ChannelGroup;
import org.jboss.netty.channel.group.DefaultChannelGroup;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
import org.jboss.netty.handler.codec.frame.TooLongFrameException;
import org.jboss.netty.handler.codec.http.DefaultHttpResponse;
import org.jboss.netty.handler.codec.http.HttpChunkAggregator;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpRequestDecoder;
import org.jboss.netty.handler.codec.http.HttpResponse;
import org.jboss.netty.handler.codec.http.HttpResponseEncoder;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.jboss.netty.handler.codec.http.QueryStringDecoder;
import org.jboss.netty.handler.ssl.SslHandler;
import org.jboss.netty.handler.stream.ChunkedWriteHandler;
import org.jboss.netty.handler.timeout.IdleState;
import org.jboss.netty.handler.timeout.IdleStateAwareChannelHandler;
import org.jboss.netty.handler.timeout.IdleStateEvent;
import org.jboss.netty.handler.timeout.IdleStateHandler;
import org.jboss.netty.util.CharsetUtil;
import org.jboss.netty.util.HashedWheelTimer;
import org.jboss.netty.util.Timer;
import org.eclipse.jetty.http.HttpHeader;
import org.slf4j.LoggerFactory;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Charsets;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.cache.RemovalListener;
import com.google.common.cache.RemovalNotification;
import com.google.common.cache.Weigher;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import com.google.protobuf.ByteString;
public class ShuffleHandler extends AuxiliaryService {
private static final org.slf4j.Logger LOG =
LoggerFactory.getLogger(ShuffleHandler.class);
private static final org.slf4j.Logger AUDITLOG =
LoggerFactory.getLogger(ShuffleHandler.class.getName()+".audit");
public static final String SHUFFLE_MANAGE_OS_CACHE = "mapreduce.shuffle.manage.os.cache";
public static final boolean DEFAULT_SHUFFLE_MANAGE_OS_CACHE = true;
public static final String SHUFFLE_READAHEAD_BYTES = "mapreduce.shuffle.readahead.bytes";
public static final int DEFAULT_SHUFFLE_READAHEAD_BYTES = 4 * 1024 * 1024;
// pattern to identify errors related to the client closing the socket early
// idea borrowed from Netty SslHandler
private static final Pattern IGNORABLE_ERROR_MESSAGE = Pattern.compile(
"^.*(?:connection.*reset|connection.*closed|broken.*pipe).*$",
Pattern.CASE_INSENSITIVE);
private static final String STATE_DB_NAME = "mapreduce_shuffle_state";
private static final String STATE_DB_SCHEMA_VERSION_KEY = "shuffle-schema-version";
protected static final Version CURRENT_VERSION_INFO =
Version.newInstance(1, 0);
private static final String DATA_FILE_NAME = "file.out";
private static final String INDEX_FILE_NAME = "file.out.index";
public static final HttpResponseStatus TOO_MANY_REQ_STATUS =
new HttpResponseStatus(429, "TOO MANY REQUESTS");
// This should kept in sync with Fetcher.FETCH_RETRY_DELAY_DEFAULT
public static final long FETCH_RETRY_DELAY = 1000L;
public static final String RETRY_AFTER_HEADER = "Retry-After";
private int port;
private ChannelFactory selector;
private final ChannelGroup accepted = new DefaultChannelGroup();
protected HttpPipelineFactory pipelineFact;
private int sslFileBufferSize;
/**
* Should the shuffle use posix_fadvise calls to manage the OS cache during
* sendfile
*/
private boolean manageOsCache;
private int readaheadLength;
private int maxShuffleConnections;
private int shuffleBufferSize;
private boolean shuffleTransferToAllowed;
private int maxSessionOpenFiles;
private ReadaheadPool readaheadPool = ReadaheadPool.getInstance();
private Map userRsrc;
private JobTokenSecretManager secretManager;
private DB stateDb = null;
public static final String MAPREDUCE_SHUFFLE_SERVICEID =
"mapreduce_shuffle";
public static final String SHUFFLE_PORT_CONFIG_KEY = "mapreduce.shuffle.port";
public static final int DEFAULT_SHUFFLE_PORT = 13562;
public static final String SHUFFLE_LISTEN_QUEUE_SIZE =
"mapreduce.shuffle.listen.queue.size";
public static final int DEFAULT_SHUFFLE_LISTEN_QUEUE_SIZE = 128;
public static final String SHUFFLE_CONNECTION_KEEP_ALIVE_ENABLED =
"mapreduce.shuffle.connection-keep-alive.enable";
public static final boolean DEFAULT_SHUFFLE_CONNECTION_KEEP_ALIVE_ENABLED = false;
public static final String SHUFFLE_CONNECTION_KEEP_ALIVE_TIME_OUT =
"mapreduce.shuffle.connection-keep-alive.timeout";
public static final int DEFAULT_SHUFFLE_CONNECTION_KEEP_ALIVE_TIME_OUT = 5; //seconds
public static final String SHUFFLE_MAPOUTPUT_META_INFO_CACHE_SIZE =
"mapreduce.shuffle.mapoutput-info.meta.cache.size";
public static final int DEFAULT_SHUFFLE_MAPOUTPUT_META_INFO_CACHE_SIZE =
1000;
public static final String CONNECTION_CLOSE = "close";
public static final String SUFFLE_SSL_FILE_BUFFER_SIZE_KEY =
"mapreduce.shuffle.ssl.file.buffer.size";
public static final int DEFAULT_SUFFLE_SSL_FILE_BUFFER_SIZE = 60 * 1024;
public static final String MAX_SHUFFLE_CONNECTIONS = "mapreduce.shuffle.max.connections";
public static final int DEFAULT_MAX_SHUFFLE_CONNECTIONS = 0; // 0 implies no limit
public static final String MAX_SHUFFLE_THREADS = "mapreduce.shuffle.max.threads";
// 0 implies Netty default of 2 * number of available processors
public static final int DEFAULT_MAX_SHUFFLE_THREADS = 0;
public static final String SHUFFLE_BUFFER_SIZE =
"mapreduce.shuffle.transfer.buffer.size";
public static final int DEFAULT_SHUFFLE_BUFFER_SIZE = 128 * 1024;
public static final String SHUFFLE_TRANSFERTO_ALLOWED =
"mapreduce.shuffle.transferTo.allowed";
public static final boolean DEFAULT_SHUFFLE_TRANSFERTO_ALLOWED = true;
public static final boolean WINDOWS_DEFAULT_SHUFFLE_TRANSFERTO_ALLOWED =
false;
private static final String TIMEOUT_HANDLER = "timeout";
/* the maximum number of files a single GET request can
open simultaneously during shuffle
*/
public static final String SHUFFLE_MAX_SESSION_OPEN_FILES =
"mapreduce.shuffle.max.session-open-files";
public static final int DEFAULT_SHUFFLE_MAX_SESSION_OPEN_FILES = 3;
boolean connectionKeepAliveEnabled = false;
private int connectionKeepAliveTimeOut;
private int mapOutputMetaInfoCacheSize;
private Timer timer;
@Metrics(about="Shuffle output metrics", context="mapred")
static class ShuffleMetrics implements ChannelFutureListener {
@Metric("Shuffle output in bytes")
MutableCounterLong shuffleOutputBytes;
@Metric("# of failed shuffle outputs")
MutableCounterInt shuffleOutputsFailed;
@Metric("# of succeeeded shuffle outputs")
MutableCounterInt shuffleOutputsOK;
@Metric("# of current shuffle connections")
MutableGaugeInt shuffleConnections;
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (future.isSuccess()) {
shuffleOutputsOK.incr();
} else {
shuffleOutputsFailed.incr();
}
shuffleConnections.decr();
}
}
final ShuffleMetrics metrics;
class ReduceMapFileCount implements ChannelFutureListener {
private ReduceContext reduceContext;
public ReduceMapFileCount(ReduceContext rc) {
this.reduceContext = rc;
}
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (!future.isSuccess()) {
future.getChannel().close();
return;
}
int waitCount = this.reduceContext.getMapsToWait().decrementAndGet();
if (waitCount == 0) {
metrics.operationComplete(future);
// Let the idle timer handler close keep-alive connections
if (reduceContext.getKeepAlive()) {
ChannelPipeline pipeline = future.getChannel().getPipeline();
TimeoutHandler timeoutHandler =
(TimeoutHandler)pipeline.get(TIMEOUT_HANDLER);
timeoutHandler.setEnabledTimeout(true);
} else {
future.getChannel().close();
}
} else {
pipelineFact.getSHUFFLE().sendMap(reduceContext);
}
}
}
/**
* Maintain parameters per messageReceived() Netty context.
* Allows sendMapOutput calls from operationComplete()
*/
private static class ReduceContext {
private List mapIds;
private AtomicInteger mapsToWait;
private AtomicInteger mapsToSend;
private int reduceId;
private ChannelHandlerContext ctx;
private String user;
private Map infoMap;
private String jobId;
private final boolean keepAlive;
public ReduceContext(List mapIds, int rId,
ChannelHandlerContext context, String usr,
Map mapOutputInfoMap,
String jobId, boolean keepAlive) {
this.mapIds = mapIds;
this.reduceId = rId;
/**
* Atomic count for tracking the no. of map outputs that are yet to
* complete. Multiple futureListeners' operationComplete() can decrement
* this value asynchronously. It is used to decide when the channel should
* be closed.
*/
this.mapsToWait = new AtomicInteger(mapIds.size());
/**
* Atomic count for tracking the no. of map outputs that have been sent.
* Multiple sendMap() calls can increment this value
* asynchronously. Used to decide which mapId should be sent next.
*/
this.mapsToSend = new AtomicInteger(0);
this.ctx = context;
this.user = usr;
this.infoMap = mapOutputInfoMap;
this.jobId = jobId;
this.keepAlive = keepAlive;
}
public int getReduceId() {
return reduceId;
}
public ChannelHandlerContext getCtx() {
return ctx;
}
public String getUser() {
return user;
}
public Map getInfoMap() {
return infoMap;
}
public String getJobId() {
return jobId;
}
public List getMapIds() {
return mapIds;
}
public AtomicInteger getMapsToSend() {
return mapsToSend;
}
public AtomicInteger getMapsToWait() {
return mapsToWait;
}
public boolean getKeepAlive() {
return keepAlive;
}
}
ShuffleHandler(MetricsSystem ms) {
super(MAPREDUCE_SHUFFLE_SERVICEID);
metrics = ms.register(new ShuffleMetrics());
}
public ShuffleHandler() {
this(DefaultMetricsSystem.instance());
}
/**
* Serialize the shuffle port into a ByteBuffer for use later on.
* @param port the port to be sent to the ApplciationMaster
* @return the serialized form of the port.
*/
public static ByteBuffer serializeMetaData(int port) throws IOException {
//TODO these bytes should be versioned
DataOutputBuffer port_dob = new DataOutputBuffer();
port_dob.writeInt(port);
return ByteBuffer.wrap(port_dob.getData(), 0, port_dob.getLength());
}
/**
* A helper function to deserialize the metadata returned by ShuffleHandler.
* @param meta the metadata returned by the ShuffleHandler
* @return the port the Shuffle Handler is listening on to serve shuffle data.
*/
public static int deserializeMetaData(ByteBuffer meta) throws IOException {
//TODO this should be returning a class not just an int
DataInputByteBuffer in = new DataInputByteBuffer();
in.reset(meta);
int port = in.readInt();
return port;
}
/**
* A helper function to serialize the JobTokenIdentifier to be sent to the
* ShuffleHandler as ServiceData.
* @param jobToken the job token to be used for authentication of
* shuffle data requests.
* @return the serialized version of the jobToken.
*/
public static ByteBuffer serializeServiceData(Token jobToken) throws IOException {
//TODO these bytes should be versioned
DataOutputBuffer jobToken_dob = new DataOutputBuffer();
jobToken.write(jobToken_dob);
return ByteBuffer.wrap(jobToken_dob.getData(), 0, jobToken_dob.getLength());
}
static Token deserializeServiceData(ByteBuffer secret) throws IOException {
DataInputByteBuffer in = new DataInputByteBuffer();
in.reset(secret);
Token jt = new Token();
jt.readFields(in);
return jt;
}
@Override
public void initializeApplication(ApplicationInitializationContext context) {
String user = context.getUser();
ApplicationId appId = context.getApplicationId();
ByteBuffer secret = context.getApplicationDataForService();
// TODO these bytes should be versioned
try {
Token jt = deserializeServiceData(secret);
// TODO: Once SHuffle is out of NM, this can use MR APIs
JobID jobId = new JobID(Long.toString(appId.getClusterTimestamp()), appId.getId());
recordJobShuffleInfo(jobId, user, jt);
} catch (IOException e) {
LOG.error("Error during initApp", e);
// TODO add API to AuxiliaryServices to report failures
}
}
@Override
public void stopApplication(ApplicationTerminationContext context) {
ApplicationId appId = context.getApplicationId();
JobID jobId = new JobID(Long.toString(appId.getClusterTimestamp()), appId.getId());
try {
removeJobShuffleInfo(jobId);
} catch (IOException e) {
LOG.error("Error during stopApp", e);
// TODO add API to AuxiliaryServices to report failures
}
}
@Override
protected void serviceInit(Configuration conf) throws Exception {
manageOsCache = conf.getBoolean(SHUFFLE_MANAGE_OS_CACHE,
DEFAULT_SHUFFLE_MANAGE_OS_CACHE);
readaheadLength = conf.getInt(SHUFFLE_READAHEAD_BYTES,
DEFAULT_SHUFFLE_READAHEAD_BYTES);
maxShuffleConnections = conf.getInt(MAX_SHUFFLE_CONNECTIONS,
DEFAULT_MAX_SHUFFLE_CONNECTIONS);
int maxShuffleThreads = conf.getInt(MAX_SHUFFLE_THREADS,
DEFAULT_MAX_SHUFFLE_THREADS);
if (maxShuffleThreads == 0) {
maxShuffleThreads = 2 * Runtime.getRuntime().availableProcessors();
}
shuffleBufferSize = conf.getInt(SHUFFLE_BUFFER_SIZE,
DEFAULT_SHUFFLE_BUFFER_SIZE);
shuffleTransferToAllowed = conf.getBoolean(SHUFFLE_TRANSFERTO_ALLOWED,
(Shell.WINDOWS)?WINDOWS_DEFAULT_SHUFFLE_TRANSFERTO_ALLOWED:
DEFAULT_SHUFFLE_TRANSFERTO_ALLOWED);
maxSessionOpenFiles = conf.getInt(SHUFFLE_MAX_SESSION_OPEN_FILES,
DEFAULT_SHUFFLE_MAX_SESSION_OPEN_FILES);
ThreadFactory bossFactory = new ThreadFactoryBuilder()
.setNameFormat("ShuffleHandler Netty Boss #%d")
.build();
ThreadFactory workerFactory = new ThreadFactoryBuilder()
.setNameFormat("ShuffleHandler Netty Worker #%d")
.build();
selector = new NioServerSocketChannelFactory(
HadoopExecutors.newCachedThreadPool(bossFactory),
HadoopExecutors.newCachedThreadPool(workerFactory),
maxShuffleThreads);
super.serviceInit(new Configuration(conf));
}
// TODO change AbstractService to throw InterruptedException
@Override
protected void serviceStart() throws Exception {
Configuration conf = getConfig();
userRsrc = new ConcurrentHashMap();
secretManager = new JobTokenSecretManager();
recoverState(conf);
ServerBootstrap bootstrap = new ServerBootstrap(selector);
// Timer is shared across entire factory and must be released separately
timer = new HashedWheelTimer();
try {
pipelineFact = new HttpPipelineFactory(conf, timer);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
bootstrap.setOption("backlog", conf.getInt(SHUFFLE_LISTEN_QUEUE_SIZE,
DEFAULT_SHUFFLE_LISTEN_QUEUE_SIZE));
bootstrap.setOption("child.keepAlive", true);
bootstrap.setPipelineFactory(pipelineFact);
port = conf.getInt(SHUFFLE_PORT_CONFIG_KEY, DEFAULT_SHUFFLE_PORT);
Channel ch = bootstrap.bind(new InetSocketAddress(port));
accepted.add(ch);
port = ((InetSocketAddress)ch.getLocalAddress()).getPort();
conf.set(SHUFFLE_PORT_CONFIG_KEY, Integer.toString(port));
pipelineFact.SHUFFLE.setPort(port);
LOG.info(getName() + " listening on port " + port);
super.serviceStart();
sslFileBufferSize = conf.getInt(SUFFLE_SSL_FILE_BUFFER_SIZE_KEY,
DEFAULT_SUFFLE_SSL_FILE_BUFFER_SIZE);
connectionKeepAliveEnabled =
conf.getBoolean(SHUFFLE_CONNECTION_KEEP_ALIVE_ENABLED,
DEFAULT_SHUFFLE_CONNECTION_KEEP_ALIVE_ENABLED);
connectionKeepAliveTimeOut =
Math.max(1, conf.getInt(SHUFFLE_CONNECTION_KEEP_ALIVE_TIME_OUT,
DEFAULT_SHUFFLE_CONNECTION_KEEP_ALIVE_TIME_OUT));
mapOutputMetaInfoCacheSize =
Math.max(1, conf.getInt(SHUFFLE_MAPOUTPUT_META_INFO_CACHE_SIZE,
DEFAULT_SHUFFLE_MAPOUTPUT_META_INFO_CACHE_SIZE));
}
@Override
protected void serviceStop() throws Exception {
accepted.close().awaitUninterruptibly(10, TimeUnit.SECONDS);
if (selector != null) {
ServerBootstrap bootstrap = new ServerBootstrap(selector);
bootstrap.releaseExternalResources();
}
if (pipelineFact != null) {
pipelineFact.destroy();
}
if (timer != null) {
// Release this shared timer resource
timer.stop();
}
if (stateDb != null) {
stateDb.close();
}
super.serviceStop();
}
@Override
public synchronized ByteBuffer getMetaData() {
try {
return serializeMetaData(port);
} catch (IOException e) {
LOG.error("Error during getMeta", e);
// TODO add API to AuxiliaryServices to report failures
return null;
}
}
protected Shuffle getShuffle(Configuration conf) {
return new Shuffle(conf);
}
private void recoverState(Configuration conf) throws IOException {
Path recoveryRoot = getRecoveryPath();
if (recoveryRoot != null) {
startStore(recoveryRoot);
Pattern jobPattern = Pattern.compile(JobID.JOBID_REGEX);
LeveldbIterator iter = null;
try {
iter = new LeveldbIterator(stateDb);
iter.seek(bytes(JobID.JOB));
while (iter.hasNext()) {
Map.Entry entry = iter.next();
String key = asString(entry.getKey());
if (!jobPattern.matcher(key).matches()) {
break;
}
recoverJobShuffleInfo(key, entry.getValue());
}
} catch (DBException e) {
throw new IOException("Database error during recovery", e);
} finally {
if (iter != null) {
iter.close();
}
}
}
}
private void startStore(Path recoveryRoot) throws IOException {
Options options = new Options();
options.createIfMissing(false);
Path dbPath = new Path(recoveryRoot, STATE_DB_NAME);
LOG.info("Using state database at " + dbPath + " for recovery");
File dbfile = new File(dbPath.toString());
try {
stateDb = JniDBFactory.factory.open(dbfile, options);
} catch (NativeDB.DBException e) {
if (e.isNotFound() || e.getMessage().contains(" does not exist ")) {
LOG.info("Creating state database at " + dbfile);
options.createIfMissing(true);
try {
stateDb = JniDBFactory.factory.open(dbfile, options);
storeVersion();
} catch (DBException dbExc) {
throw new IOException("Unable to create state store", dbExc);
}
} else {
throw e;
}
}
checkVersion();
}
@VisibleForTesting
Version loadVersion() throws IOException {
byte[] data = stateDb.get(bytes(STATE_DB_SCHEMA_VERSION_KEY));
// if version is not stored previously, treat it as CURRENT_VERSION_INFO.
if (data == null || data.length == 0) {
return getCurrentVersion();
}
Version version =
new VersionPBImpl(VersionProto.parseFrom(data));
return version;
}
private void storeSchemaVersion(Version version) throws IOException {
String key = STATE_DB_SCHEMA_VERSION_KEY;
byte[] data =
((VersionPBImpl) version).getProto().toByteArray();
try {
stateDb.put(bytes(key), data);
} catch (DBException e) {
throw new IOException(e.getMessage(), e);
}
}
private void storeVersion() throws IOException {
storeSchemaVersion(CURRENT_VERSION_INFO);
}
// Only used for test
@VisibleForTesting
void storeVersion(Version version) throws IOException {
storeSchemaVersion(version);
}
protected Version getCurrentVersion() {
return CURRENT_VERSION_INFO;
}
/**
* 1) Versioning scheme: major.minor. For e.g. 1.0, 1.1, 1.2...1.25, 2.0 etc.
* 2) Any incompatible change of DB schema is a major upgrade, and any
* compatible change of DB schema is a minor upgrade.
* 3) Within a minor upgrade, say 1.1 to 1.2:
* overwrite the version info and proceed as normal.
* 4) Within a major upgrade, say 1.2 to 2.0:
* throw exception and indicate user to use a separate upgrade tool to
* upgrade shuffle info or remove incompatible old state.
*/
private void checkVersion() throws IOException {
Version loadedVersion = loadVersion();
LOG.info("Loaded state DB schema version info " + loadedVersion);
if (loadedVersion.equals(getCurrentVersion())) {
return;
}
if (loadedVersion.isCompatibleTo(getCurrentVersion())) {
LOG.info("Storing state DB schema version info " + getCurrentVersion());
storeVersion();
} else {
throw new IOException(
"Incompatible version for state DB schema: expecting DB schema version "
+ getCurrentVersion() + ", but loading version " + loadedVersion);
}
}
private void addJobToken(JobID jobId, String user,
Token jobToken) {
userRsrc.put(jobId.toString(), user);
secretManager.addTokenForJob(jobId.toString(), jobToken);
LOG.info("Added token for " + jobId.toString());
}
private void recoverJobShuffleInfo(String jobIdStr, byte[] data)
throws IOException {
JobID jobId;
try {
jobId = JobID.forName(jobIdStr);
} catch (IllegalArgumentException e) {
throw new IOException("Bad job ID " + jobIdStr + " in state store", e);
}
JobShuffleInfoProto proto = JobShuffleInfoProto.parseFrom(data);
String user = proto.getUser();
TokenProto tokenProto = proto.getJobToken();
Token jobToken = new Token(
tokenProto.getIdentifier().toByteArray(),
tokenProto.getPassword().toByteArray(),
new Text(tokenProto.getKind()), new Text(tokenProto.getService()));
addJobToken(jobId, user, jobToken);
}
private void recordJobShuffleInfo(JobID jobId, String user,
Token jobToken) throws IOException {
if (stateDb != null) {
TokenProto tokenProto = TokenProto.newBuilder()
.setIdentifier(ByteString.copyFrom(jobToken.getIdentifier()))
.setPassword(ByteString.copyFrom(jobToken.getPassword()))
.setKind(jobToken.getKind().toString())
.setService(jobToken.getService().toString())
.build();
JobShuffleInfoProto proto = JobShuffleInfoProto.newBuilder()
.setUser(user).setJobToken(tokenProto).build();
try {
stateDb.put(bytes(jobId.toString()), proto.toByteArray());
} catch (DBException e) {
throw new IOException("Error storing " + jobId, e);
}
}
addJobToken(jobId, user, jobToken);
}
private void removeJobShuffleInfo(JobID jobId) throws IOException {
String jobIdStr = jobId.toString();
secretManager.removeTokenForJob(jobIdStr);
userRsrc.remove(jobIdStr);
if (stateDb != null) {
try {
stateDb.delete(bytes(jobIdStr));
} catch (DBException e) {
throw new IOException("Unable to remove " + jobId
+ " from state store", e);
}
}
}
static class TimeoutHandler extends IdleStateAwareChannelHandler {
private boolean enabledTimeout;
void setEnabledTimeout(boolean enabledTimeout) {
this.enabledTimeout = enabledTimeout;
}
@Override
public void channelIdle(ChannelHandlerContext ctx, IdleStateEvent e) {
if (e.getState() == IdleState.WRITER_IDLE && enabledTimeout) {
e.getChannel().close();
}
}
}
class HttpPipelineFactory implements ChannelPipelineFactory {
final Shuffle SHUFFLE;
private SSLFactory sslFactory;
private final ChannelHandler idleStateHandler;
public HttpPipelineFactory(Configuration conf, Timer timer) throws Exception {
SHUFFLE = getShuffle(conf);
if (conf.getBoolean(MRConfig.SHUFFLE_SSL_ENABLED_KEY,
MRConfig.SHUFFLE_SSL_ENABLED_DEFAULT)) {
LOG.info("Encrypted shuffle is enabled.");
sslFactory = new SSLFactory(SSLFactory.Mode.SERVER, conf);
sslFactory.init();
}
this.idleStateHandler = new IdleStateHandler(timer, 0, connectionKeepAliveTimeOut, 0);
}
public Shuffle getSHUFFLE() {
return SHUFFLE;
}
public void destroy() {
if (sslFactory != null) {
sslFactory.destroy();
}
}
@Override
public ChannelPipeline getPipeline() throws Exception {
ChannelPipeline pipeline = Channels.pipeline();
if (sslFactory != null) {
pipeline.addLast("ssl", new SslHandler(sslFactory.createSSLEngine()));
}
pipeline.addLast("decoder", new HttpRequestDecoder());
pipeline.addLast("aggregator", new HttpChunkAggregator(1 << 16));
pipeline.addLast("encoder", new HttpResponseEncoder());
pipeline.addLast("chunking", new ChunkedWriteHandler());
pipeline.addLast("shuffle", SHUFFLE);
pipeline.addLast("idle", idleStateHandler);
pipeline.addLast(TIMEOUT_HANDLER, new TimeoutHandler());
return pipeline;
// TODO factor security manager into pipeline
// TODO factor out encode/decode to permit binary shuffle
// TODO factor out decode of index to permit alt. models
}
}
class Shuffle extends SimpleChannelUpstreamHandler {
private static final int MAX_WEIGHT = 10 * 1024 * 1024;
private static final int EXPIRE_AFTER_ACCESS_MINUTES = 5;
private static final int ALLOWED_CONCURRENCY = 16;
private final Configuration conf;
private final IndexCache indexCache;
private int port;
private final LoadingCache pathCache =
CacheBuilder.newBuilder().expireAfterAccess(EXPIRE_AFTER_ACCESS_MINUTES,
TimeUnit.MINUTES).softValues().concurrencyLevel(ALLOWED_CONCURRENCY).
removalListener(
new RemovalListener() {
@Override
public void onRemoval(RemovalNotification notification) {
if (LOG.isDebugEnabled()) {
LOG.debug("PathCache Eviction: " + notification.getKey() +
", Reason=" + notification.getCause());
}
}
}
).maximumWeight(MAX_WEIGHT).weigher(
new Weigher() {
@Override
public int weigh(AttemptPathIdentifier key,
AttemptPathInfo value) {
return key.jobId.length() + key.user.length() +
key.attemptId.length()+
value.indexPath.toString().length() +
value.dataPath.toString().length();
}
}
).build(new CacheLoader() {
@Override
public AttemptPathInfo load(AttemptPathIdentifier key) throws
Exception {
String base = getBaseLocation(key.jobId, key.user);
String attemptBase = base + key.attemptId;
Path indexFileName = getAuxiliaryLocalPathHandler()
.getLocalPathForRead(attemptBase + "/" + INDEX_FILE_NAME);
Path mapOutputFileName = getAuxiliaryLocalPathHandler()
.getLocalPathForRead(attemptBase + "/" + DATA_FILE_NAME);
if (LOG.isDebugEnabled()) {
LOG.debug("Loaded : " + key + " via loader");
}
return new AttemptPathInfo(indexFileName, mapOutputFileName);
}
});
public Shuffle(Configuration conf) {
this.conf = conf;
indexCache = new IndexCache(new JobConf(conf));
this.port = conf.getInt(SHUFFLE_PORT_CONFIG_KEY, DEFAULT_SHUFFLE_PORT);
}
public void setPort(int port) {
this.port = port;
}
private List splitMaps(List mapq) {
if (null == mapq) {
return null;
}
final List ret = new ArrayList();
for (String s : mapq) {
Collections.addAll(ret, s.split(","));
}
return ret;
}
@Override
public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent evt)
throws Exception {
super.channelOpen(ctx, evt);
if ((maxShuffleConnections > 0) && (accepted.size() >= maxShuffleConnections)) {
LOG.info(String.format("Current number of shuffle connections (%d) is " +
"greater than or equal to the max allowed shuffle connections (%d)",
accepted.size(), maxShuffleConnections));
Map headers = new HashMap(1);
// notify fetchers to backoff for a while before closing the connection
// if the shuffle connection limit is hit. Fetchers are expected to
// handle this notification gracefully, that is, not treating this as a
// fetch failure.
headers.put(RETRY_AFTER_HEADER, String.valueOf(FETCH_RETRY_DELAY));
sendError(ctx, "", TOO_MANY_REQ_STATUS, headers);
return;
}
accepted.add(evt.getChannel());
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent evt)
throws Exception {
HttpRequest request = (HttpRequest) evt.getMessage();
if (request.getMethod() != GET) {
sendError(ctx, METHOD_NOT_ALLOWED);
return;
}
// Check whether the shuffle version is compatible
if (!ShuffleHeader.DEFAULT_HTTP_HEADER_NAME.equals(
request.headers() != null ?
request.headers().get(ShuffleHeader.HTTP_HEADER_NAME) : null)
|| !ShuffleHeader.DEFAULT_HTTP_HEADER_VERSION.equals(
request.headers() != null ?
request.headers()
.get(ShuffleHeader.HTTP_HEADER_VERSION) : null)) {
sendError(ctx, "Incompatible shuffle request version", BAD_REQUEST);
}
final Map> q =
new QueryStringDecoder(request.getUri()).getParameters();
final List keepAliveList = q.get("keepAlive");
boolean keepAliveParam = false;
if (keepAliveList != null && keepAliveList.size() == 1) {
keepAliveParam = Boolean.valueOf(keepAliveList.get(0));
if (LOG.isDebugEnabled()) {
LOG.debug("KeepAliveParam : " + keepAliveList
+ " : " + keepAliveParam);
}
}
final List mapIds = splitMaps(q.get("map"));
final List reduceQ = q.get("reduce");
final List jobQ = q.get("job");
if (LOG.isDebugEnabled()) {
LOG.debug("RECV: " + request.getUri() +
"\n mapId: " + mapIds +
"\n reduceId: " + reduceQ +
"\n jobId: " + jobQ +
"\n keepAlive: " + keepAliveParam);
}
if (mapIds == null || reduceQ == null || jobQ == null) {
sendError(ctx, "Required param job, map and reduce", BAD_REQUEST);
return;
}
if (reduceQ.size() != 1 || jobQ.size() != 1) {
sendError(ctx, "Too many job/reduce parameters", BAD_REQUEST);
return;
}
int reduceId;
String jobId;
try {
reduceId = Integer.parseInt(reduceQ.get(0));
jobId = jobQ.get(0);
} catch (NumberFormatException e) {
sendError(ctx, "Bad reduce parameter", BAD_REQUEST);
return;
} catch (IllegalArgumentException e) {
sendError(ctx, "Bad job parameter", BAD_REQUEST);
return;
}
final String reqUri = request.getUri();
if (null == reqUri) {
// TODO? add upstream?
sendError(ctx, FORBIDDEN);
return;
}
HttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
try {
verifyRequest(jobId, ctx, request, response,
new URL("http", "", this.port, reqUri));
} catch (IOException e) {
LOG.warn("Shuffle failure ", e);
sendError(ctx, e.getMessage(), UNAUTHORIZED);
return;
}
Map mapOutputInfoMap =
new HashMap();
Channel ch = evt.getChannel();
ChannelPipeline pipeline = ch.getPipeline();
TimeoutHandler timeoutHandler =
(TimeoutHandler)pipeline.get(TIMEOUT_HANDLER);
timeoutHandler.setEnabledTimeout(false);
String user = userRsrc.get(jobId);
try {
populateHeaders(mapIds, jobId, user, reduceId, request,
response, keepAliveParam, mapOutputInfoMap);
} catch(IOException e) {
ch.write(response);
LOG.error("Shuffle error in populating headers :", e);
String errorMessage = getErrorMessage(e);
sendError(ctx,errorMessage , INTERNAL_SERVER_ERROR);
return;
}
ch.write(response);
//Initialize one ReduceContext object per messageReceived call
boolean keepAlive = keepAliveParam || connectionKeepAliveEnabled;
ReduceContext reduceContext = new ReduceContext(mapIds, reduceId, ctx,
user, mapOutputInfoMap, jobId, keepAlive);
for (int i = 0; i < Math.min(maxSessionOpenFiles, mapIds.size()); i++) {
ChannelFuture nextMap = sendMap(reduceContext);
if(nextMap == null) {
return;
}
}
}
/**
* Calls sendMapOutput for the mapId pointed by ReduceContext.mapsToSend
* and increments it. This method is first called by messageReceived()
* maxSessionOpenFiles times and then on the completion of every
* sendMapOutput operation. This limits the number of open files on a node,
* which can get really large(exhausting file descriptors on the NM) if all
* sendMapOutputs are called in one go, as was done previous to this change.
* @param reduceContext used to call sendMapOutput with correct params.
* @return the ChannelFuture of the sendMapOutput, can be null.
*/
public ChannelFuture sendMap(ReduceContext reduceContext)
throws Exception {
ChannelFuture nextMap = null;
if (reduceContext.getMapsToSend().get() <
reduceContext.getMapIds().size()) {
int nextIndex = reduceContext.getMapsToSend().getAndIncrement();
String mapId = reduceContext.getMapIds().get(nextIndex);
try {
MapOutputInfo info = reduceContext.getInfoMap().get(mapId);
if (info == null) {
info = getMapOutputInfo(mapId, reduceContext.getReduceId(),
reduceContext.getJobId(), reduceContext.getUser());
}
nextMap = sendMapOutput(
reduceContext.getCtx(),
reduceContext.getCtx().getChannel(),
reduceContext.getUser(), mapId,
reduceContext.getReduceId(), info);
if (null == nextMap) {
sendError(reduceContext.getCtx(), NOT_FOUND);
return null;
}
nextMap.addListener(new ReduceMapFileCount(reduceContext));
} catch (IOException e) {
if (e instanceof DiskChecker.DiskErrorException) {
LOG.error("Shuffle error :" + e);
} else {
LOG.error("Shuffle error :", e);
}
String errorMessage = getErrorMessage(e);
sendError(reduceContext.getCtx(), errorMessage,
INTERNAL_SERVER_ERROR);
return null;
}
}
return nextMap;
}
private String getErrorMessage(Throwable t) {
StringBuffer sb = new StringBuffer(t.getMessage());
while (t.getCause() != null) {
sb.append(t.getCause().getMessage());
t = t.getCause();
}
return sb.toString();
}
private String getBaseLocation(String jobId, String user) {
final JobID jobID = JobID.forName(jobId);
final ApplicationId appID =
ApplicationId.newInstance(Long.parseLong(jobID.getJtIdentifier()),
jobID.getId());
final String baseStr =
ContainerLocalizer.USERCACHE + "/" + user + "/"
+ ContainerLocalizer.APPCACHE + "/"
+ appID.toString() + "/output" + "/";
return baseStr;
}
protected MapOutputInfo getMapOutputInfo(String mapId, int reduce,
String jobId, String user) throws IOException {
AttemptPathInfo pathInfo;
try {
AttemptPathIdentifier identifier = new AttemptPathIdentifier(
jobId, user, mapId);
pathInfo = pathCache.get(identifier);
if (LOG.isDebugEnabled()) {
LOG.debug("Retrieved pathInfo for " + identifier +
" check for corresponding loaded messages to determine whether" +
" it was loaded or cached");
}
} catch (ExecutionException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
} else {
throw new RuntimeException(e.getCause());
}
}
IndexRecord info =
indexCache.getIndexInformation(mapId, reduce, pathInfo.indexPath, user);
if (LOG.isDebugEnabled()) {
LOG.debug("getMapOutputInfo: jobId=" + jobId + ", mapId=" + mapId +
",dataFile=" + pathInfo.dataPath + ", indexFile=" +
pathInfo.indexPath);
}
MapOutputInfo outputInfo = new MapOutputInfo(pathInfo.dataPath, info);
return outputInfo;
}
protected void populateHeaders(List mapIds, String jobId,
String user, int reduce, HttpRequest request, HttpResponse response,
boolean keepAliveParam, Map mapOutputInfoMap)
throws IOException {
long contentLength = 0;
for (String mapId : mapIds) {
MapOutputInfo outputInfo = getMapOutputInfo(mapId, reduce, jobId, user);
if (mapOutputInfoMap.size() < mapOutputMetaInfoCacheSize) {
mapOutputInfoMap.put(mapId, outputInfo);
}
ShuffleHeader header =
new ShuffleHeader(mapId, outputInfo.indexRecord.partLength,
outputInfo.indexRecord.rawLength, reduce);
DataOutputBuffer dob = new DataOutputBuffer();
header.write(dob);
contentLength += outputInfo.indexRecord.partLength;
contentLength += dob.getLength();
}
// Now set the response headers.
setResponseHeaders(response, keepAliveParam, contentLength);
// this audit log is disabled by default,
// to turn it on please enable this audit log
// on log4j.properties by uncommenting the setting
if (AUDITLOG.isDebugEnabled()) {
StringBuilder sb = new StringBuilder("shuffle for ");
sb.append(jobId).append(" reducer ").append(reduce);
sb.append(" length ").append(contentLength);
sb.append(" mappers: ").append(mapIds);
AUDITLOG.debug(sb.toString());
}
}
protected void setResponseHeaders(HttpResponse response,
boolean keepAliveParam, long contentLength) {
if (!connectionKeepAliveEnabled && !keepAliveParam) {
if (LOG.isDebugEnabled()) {
LOG.debug("Setting connection close header...");
}
response.headers().set(HttpHeader.CONNECTION.asString(),
CONNECTION_CLOSE);
} else {
response.headers().set(HttpHeader.CONTENT_LENGTH.asString(),
String.valueOf(contentLength));
response.headers().set(HttpHeader.CONNECTION.asString(),
HttpHeader.KEEP_ALIVE.asString());
response.headers().set(HttpHeader.KEEP_ALIVE.asString(),
"timeout=" + connectionKeepAliveTimeOut);
LOG.info("Content Length in shuffle : " + contentLength);
}
}
class MapOutputInfo {
final Path mapOutputFileName;
final IndexRecord indexRecord;
MapOutputInfo(Path mapOutputFileName, IndexRecord indexRecord) {
this.mapOutputFileName = mapOutputFileName;
this.indexRecord = indexRecord;
}
}
protected void verifyRequest(String appid, ChannelHandlerContext ctx,
HttpRequest request, HttpResponse response, URL requestUri)
throws IOException {
SecretKey tokenSecret = secretManager.retrieveTokenSecret(appid);
if (null == tokenSecret) {
LOG.info("Request for unknown token " + appid);
throw new IOException("could not find jobid");
}
// string to encrypt
String enc_str = SecureShuffleUtils.buildMsgFrom(requestUri);
// hash from the fetcher
String urlHashStr =
request.headers().get(SecureShuffleUtils.HTTP_HEADER_URL_HASH);
if (urlHashStr == null) {
LOG.info("Missing header hash for " + appid);
throw new IOException("fetcher cannot be authenticated");
}
if (LOG.isDebugEnabled()) {
int len = urlHashStr.length();
LOG.debug("verifying request. enc_str=" + enc_str + "; hash=..." +
urlHashStr.substring(len-len/2, len-1));
}
// verify - throws exception
SecureShuffleUtils.verifyReply(urlHashStr, enc_str, tokenSecret);
// verification passed - encode the reply
String reply =
SecureShuffleUtils.generateHash(urlHashStr.getBytes(Charsets.UTF_8),
tokenSecret);
response.headers().set(
SecureShuffleUtils.HTTP_HEADER_REPLY_URL_HASH, reply);
// Put shuffle version into http header
response.headers().set(ShuffleHeader.HTTP_HEADER_NAME,
ShuffleHeader.DEFAULT_HTTP_HEADER_NAME);
response.headers().set(ShuffleHeader.HTTP_HEADER_VERSION,
ShuffleHeader.DEFAULT_HTTP_HEADER_VERSION);
if (LOG.isDebugEnabled()) {
int len = reply.length();
LOG.debug("Fetcher request verfied. enc_str=" + enc_str + ";reply=" +
reply.substring(len-len/2, len-1));
}
}
protected ChannelFuture sendMapOutput(ChannelHandlerContext ctx, Channel ch,
String user, String mapId, int reduce, MapOutputInfo mapOutputInfo)
throws IOException {
final IndexRecord info = mapOutputInfo.indexRecord;
final ShuffleHeader header =
new ShuffleHeader(mapId, info.partLength, info.rawLength, reduce);
final DataOutputBuffer dob = new DataOutputBuffer();
header.write(dob);
ch.write(wrappedBuffer(dob.getData(), 0, dob.getLength()));
final File spillfile =
new File(mapOutputInfo.mapOutputFileName.toString());
RandomAccessFile spill;
try {
spill = SecureIOUtils.openForRandomRead(spillfile, "r", user, null);
} catch (FileNotFoundException e) {
LOG.info(spillfile + " not found");
return null;
}
ChannelFuture writeFuture;
if (ch.getPipeline().get(SslHandler.class) == null) {
final FadvisedFileRegion partition = new FadvisedFileRegion(spill,
info.startOffset, info.partLength, manageOsCache, readaheadLength,
readaheadPool, spillfile.getAbsolutePath(),
shuffleBufferSize, shuffleTransferToAllowed);
writeFuture = ch.write(partition);
writeFuture.addListener(new ChannelFutureListener() {
// TODO error handling; distinguish IO/connection failures,
// attribute to appropriate spill output
@Override
public void operationComplete(ChannelFuture future) {
if (future.isSuccess()) {
partition.transferSuccessful();
}
partition.releaseExternalResources();
}
});
} else {
// HTTPS cannot be done with zero copy.
final FadvisedChunkedFile chunk = new FadvisedChunkedFile(spill,
info.startOffset, info.partLength, sslFileBufferSize,
manageOsCache, readaheadLength, readaheadPool,
spillfile.getAbsolutePath());
writeFuture = ch.write(chunk);
}
metrics.shuffleConnections.incr();
metrics.shuffleOutputBytes.incr(info.partLength); // optimistic
return writeFuture;
}
protected void sendError(ChannelHandlerContext ctx,
HttpResponseStatus status) {
sendError(ctx, "", status);
}
protected void sendError(ChannelHandlerContext ctx, String message,
HttpResponseStatus status) {
sendError(ctx, message, status, Collections.emptyMap());
}
protected void sendError(ChannelHandlerContext ctx, String msg,
HttpResponseStatus status, Map headers) {
HttpResponse response = new DefaultHttpResponse(HTTP_1_1, status);
response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");
// Put shuffle version into http header
response.headers().set(ShuffleHeader.HTTP_HEADER_NAME,
ShuffleHeader.DEFAULT_HTTP_HEADER_NAME);
response.headers().set(ShuffleHeader.HTTP_HEADER_VERSION,
ShuffleHeader.DEFAULT_HTTP_HEADER_VERSION);
for (Map.Entry header : headers.entrySet()) {
response.headers().set(header.getKey(), header.getValue());
}
response.setContent(
ChannelBuffers.copiedBuffer(msg, CharsetUtil.UTF_8));
// Close the connection as soon as the error message is sent.
ctx.getChannel().write(response).addListener(ChannelFutureListener.CLOSE);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)
throws Exception {
Channel ch = e.getChannel();
Throwable cause = e.getCause();
if (cause instanceof TooLongFrameException) {
sendError(ctx, BAD_REQUEST);
return;
} else if (cause instanceof IOException) {
if (cause instanceof ClosedChannelException) {
LOG.debug("Ignoring closed channel error", cause);
return;
}
String message = String.valueOf(cause.getMessage());
if (IGNORABLE_ERROR_MESSAGE.matcher(message).matches()) {
LOG.debug("Ignoring client socket close", cause);
return;
}
}
LOG.error("Shuffle error: ", cause);
if (ch.isConnected()) {
LOG.error("Shuffle error " + e);
sendError(ctx, INTERNAL_SERVER_ERROR);
}
}
}
static class AttemptPathInfo {
// TODO Change this over to just store local dir indices, instead of the
// entire path. Far more efficient.
private final Path indexPath;
private final Path dataPath;
public AttemptPathInfo(Path indexPath, Path dataPath) {
this.indexPath = indexPath;
this.dataPath = dataPath;
}
}
static class AttemptPathIdentifier {
private final String jobId;
private final String user;
private final String attemptId;
public AttemptPathIdentifier(String jobId, String user, String attemptId) {
this.jobId = jobId;
this.user = user;
this.attemptId = attemptId;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
AttemptPathIdentifier that = (AttemptPathIdentifier) o;
if (!attemptId.equals(that.attemptId)) {
return false;
}
if (!jobId.equals(that.jobId)) {
return false;
}
return true;
}
@Override
public int hashCode() {
int result = jobId.hashCode();
result = 31 * result + attemptId.hashCode();
return result;
}
@Override
public String toString() {
return "AttemptPathIdentifier{" +
"attemptId='" + attemptId + '\'' +
", jobId='" + jobId + '\'' +
'}';
}
}
}
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