/*
* Licensed 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.tez.shufflehandler;
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 javax.crypto.SecretKey;
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.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.ConcurrentMap;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.regex.Pattern;
import com.google.common.base.Charsets;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.LocalDirAllocator;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.DataOutputBuffer;
import org.apache.hadoop.io.SecureIOUtils;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.util.ConverterUtils;
import org.apache.tez.common.security.JobTokenIdentifier;
import org.apache.tez.common.security.JobTokenSecretManager;
import org.apache.tez.mapreduce.hadoop.MRConfig;
import org.apache.tez.runtime.library.common.security.SecureShuffleUtils;
import org.apache.tez.runtime.library.common.shuffle.orderedgrouped.ShuffleHeader;
import org.apache.tez.runtime.library.common.sort.impl.TezIndexRecord;
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.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.DefaultFileRegion;
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.HttpHeaders;
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.stream.ChunkedWriteHandler;
import org.jboss.netty.util.CharsetUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ShuffleHandler {
private static final Logger LOG = LoggerFactory.getLogger(ShuffleHandler.class);
public static final String SHUFFLE_HANDLER_LOCAL_DIRS = "tez.shuffle.handler.local-dirs";
// 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 int port;
private final ChannelFactory selector;
private final ChannelGroup accepted = new DefaultChannelGroup();
protected HttpPipelineFactory pipelineFact;
private final Configuration conf;
private final ConcurrentMap<String, Boolean> registeredApps = new ConcurrentHashMap<String, Boolean>();
/**
* Should the shuffle use posix_fadvise calls to manage the OS cache during
* sendfile
*/
private final int maxShuffleConnections;
private Map<String,String> userRsrc;
private JobTokenSecretManager secretManager;
public static final String SHUFFLE_PORT_CONFIG_KEY = "tez.shuffle.port";
public static final int DEFAULT_SHUFFLE_PORT = 15551;
// TODO Change configs to remove mapreduce references.
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 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;
final boolean connectionKeepAliveEnabled;
final int connectionKeepAliveTimeOut;
final int mapOutputMetaInfoCacheSize;
private static final AtomicBoolean started = new AtomicBoolean(false);
private static final AtomicBoolean initing = new AtomicBoolean(false);
private static ShuffleHandler INSTANCE;
public ShuffleHandler(Configuration conf) {
this.conf = conf;
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();
}
ThreadFactory bossFactory = new ThreadFactoryBuilder()
.setNameFormat("ShuffleHandler Netty Boss #%d")
.build();
ThreadFactory workerFactory = new ThreadFactoryBuilder()
.setNameFormat("ShuffleHandler Netty Worker #%d")
.build();
selector = new NioServerSocketChannelFactory(
Executors.newCachedThreadPool(bossFactory),
Executors.newCachedThreadPool(workerFactory),
maxShuffleThreads);
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));
userRsrc = new ConcurrentHashMap<String,String>();
secretManager = new JobTokenSecretManager();
}
public void start() throws Exception {
ServerBootstrap bootstrap = new ServerBootstrap(selector);
try {
pipelineFact = new HttpPipelineFactory(conf);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
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("TezShuffleHandler" + " listening on port " + port);
}
public static void initializeAndStart(Configuration conf) throws Exception {
if (!initing.getAndSet(true)) {
INSTANCE = new ShuffleHandler(conf);
INSTANCE.start();
started.set(true);
}
}
public static ShuffleHandler get() {
Preconditions.checkState(started.get(),
"ShuffleHandler must be started before invoking started");
return INSTANCE;
}
public int getPort() {
return port;
}
public void registerApplication(String applicationIdString, Token<JobTokenIdentifier> appToken,
String user) {
Boolean registered = registeredApps.putIfAbsent(applicationIdString, Boolean.valueOf(true));
if (registered == null) {
recordJobShuffleInfo(applicationIdString, user, appToken);
}
}
public void unregisterApplication(String applicationIdString) {
removeJobShuffleInfo(applicationIdString);
}
public void stop() throws Exception {
accepted.close().awaitUninterruptibly(10, TimeUnit.SECONDS);
if (selector != null) {
ServerBootstrap bootstrap = new ServerBootstrap(selector);
bootstrap.releaseExternalResources();
}
if (pipelineFact != null) {
pipelineFact.destroy();
}
}
protected Shuffle getShuffle(Configuration conf) {
return new Shuffle(conf);
}
private void addJobToken(String appIdString, String user,
Token<JobTokenIdentifier> jobToken) {
String jobIdString = appIdString.replace("application", "job");
userRsrc.put(jobIdString, user);
secretManager.addTokenForJob(jobIdString, jobToken);
LOG.info("Added token for " + jobIdString);
}
private void recordJobShuffleInfo(String appIdString, String user,
Token<JobTokenIdentifier> jobToken) {
addJobToken(appIdString, user, jobToken);
}
private void removeJobShuffleInfo(String appIdString) {
secretManager.removeTokenForJob(appIdString);
userRsrc.remove(appIdString);
}
class HttpPipelineFactory implements ChannelPipelineFactory {
final Shuffle SHUFFLE;
public HttpPipelineFactory(Configuration conf) throws Exception {
SHUFFLE = getShuffle(conf);
// TODO Setup SSL Shuffle
if (conf.getBoolean(MRConfig.SHUFFLE_SSL_ENABLED_KEY,
MRConfig.SHUFFLE_SSL_ENABLED_DEFAULT)) {
throw new UnsupportedOperationException(
"SSL Shuffle is not currently supported for the test shuffle handler");
}
}
public void destroy() {
}
@Override
public ChannelPipeline getPipeline() throws Exception {
ChannelPipeline pipeline = Channels.pipeline();
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);
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 final Configuration conf;
private final IndexCache indexCache;
private final LocalDirAllocator lDirAlloc =
new LocalDirAllocator(SHUFFLE_HANDLER_LOCAL_DIRS);
private int port;
public Shuffle(Configuration conf) {
this.conf = conf;
indexCache = new IndexCache(conf);
this.port = conf.getInt(SHUFFLE_PORT_CONFIG_KEY, DEFAULT_SHUFFLE_PORT);
}
public void setPort(int port) {
this.port = port;
}
private List<String> splitMaps(List<String> mapq) {
if (null == mapq) {
return null;
}
final List<String> ret = new ArrayList<String>();
for (String s : mapq) {
Collections.addAll(ret, s.split(","));
}
return ret;
}
@Override
public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent evt)
throws Exception {
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));
evt.getChannel().close();
return;
}
accepted.add(evt.getChannel());
super.channelOpen(ctx, evt);
}
@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.getHeader(ShuffleHeader.HTTP_HEADER_NAME))
|| !ShuffleHeader.DEFAULT_HTTP_HEADER_VERSION.equals(
request.getHeader(ShuffleHeader.HTTP_HEADER_VERSION))) {
sendError(ctx, "Incompatible shuffle request version", BAD_REQUEST);
}
final Map<String,List<String>> q =
new QueryStringDecoder(request.getUri()).getParameters();
final List<String> 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<String> mapIds = splitMaps(q.get("map"));
final List<String> reduceQ = q.get("reduce");
final List<String> 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<String, MapOutputInfo> mapOutputInfoMap =
new HashMap<String, MapOutputInfo>();
Channel ch = evt.getChannel();
String user = userRsrc.get(jobId);
// $x/$user/appcache/$appId/output/$mapId
// TODO: Once Shuffle is out of NM, this can use MR APIs to convert
// between App and Job
String outputBasePathStr = getBaseLocation(jobId, user);
try {
populateHeaders(mapIds, outputBasePathStr, 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);
// TODO refactor the following into the pipeline
ChannelFuture lastMap = null;
for (String mapId : mapIds) {
try {
MapOutputInfo info = mapOutputInfoMap.get(mapId);
if (info == null) {
info = getMapOutputInfo(outputBasePathStr, mapId, reduceId, user);
}
lastMap =
sendMapOutput(ctx, ch, user, mapId,
reduceId, info);
if (null == lastMap) {
sendError(ctx, NOT_FOUND);
return;
}
} catch (IOException e) {
LOG.error("Shuffle error :", e);
String errorMessage = getErrorMessage(e);
sendError(ctx,errorMessage , INTERNAL_SERVER_ERROR);
return;
}
}
lastMap.addListener(ChannelFutureListener.CLOSE);
}
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 final String USERCACHE_CONSTANT = "usercache";
private final String APPCACHE_CONSTANT = "appcache";
private String getBaseLocation(String jobIdString, String user) {
String parts[] = jobIdString.split("_");
Preconditions.checkArgument(parts.length == 3, "Invalid jobId. Expecting 3 parts");
final ApplicationId appID =
ApplicationId.newInstance(Long.parseLong(parts[1]), Integer.parseInt(parts[2]));
final String baseStr =
USERCACHE_CONSTANT + "/" + user + "/"
+ APPCACHE_CONSTANT + "/"
+ ConverterUtils.toString(appID) + "/output" + "/";
return baseStr;
}
protected MapOutputInfo getMapOutputInfo(String base, String mapId,
int reduce, String user) throws IOException {
// Index file
Path indexFileName =
lDirAlloc.getLocalPathToRead(base + "/file.out.index", conf);
TezIndexRecord info =
indexCache.getIndexInformation(mapId, reduce, indexFileName, user);
Path mapOutputFileName =
lDirAlloc.getLocalPathToRead(base + "/file.out", conf);
if (LOG.isDebugEnabled()) {
LOG.debug(base + " : " + mapOutputFileName + " : " + indexFileName);
}
MapOutputInfo outputInfo = new MapOutputInfo(mapOutputFileName, info);
return outputInfo;
}
protected void populateHeaders(List<String> mapIds, String outputBaseStr,
String user, int reduce, HttpRequest request, HttpResponse response,
boolean keepAliveParam, Map<String, MapOutputInfo> mapOutputInfoMap)
throws IOException {
long contentLength = 0;
for (String mapId : mapIds) {
String base = outputBaseStr + mapId;
MapOutputInfo outputInfo = getMapOutputInfo(base, mapId, reduce, user);
if (mapOutputInfoMap.size() < mapOutputMetaInfoCacheSize) {
mapOutputInfoMap.put(mapId, outputInfo);
}
// Index file
Path indexFileName =
lDirAlloc.getLocalPathToRead(base + "/file.out.index", conf);
TezIndexRecord info =
indexCache.getIndexInformation(mapId, reduce, indexFileName, user);
ShuffleHeader header =
new ShuffleHeader(mapId, info.getPartLength(), info.getRawLength(), reduce);
DataOutputBuffer dob = new DataOutputBuffer();
header.write(dob);
contentLength += info.getPartLength();
contentLength += dob.getLength();
}
// Now set the response headers.
setResponseHeaders(response, keepAliveParam, contentLength);
}
protected void setResponseHeaders(HttpResponse response,
boolean keepAliveParam, long contentLength) {
if (!connectionKeepAliveEnabled && !keepAliveParam) {
LOG.info("Setting connection close header...");
response.setHeader(HttpHeaders.Names.CONNECTION, CONNECTION_CLOSE);
} else {
response.setHeader(HttpHeaders.Names.CONTENT_LENGTH,
String.valueOf(contentLength));
response.setHeader(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
response.setHeader(HttpHeaders.Values.KEEP_ALIVE, "timeout="
+ connectionKeepAliveTimeOut);
LOG.info("Content Length in shuffle : " + contentLength);
}
}
class MapOutputInfo {
final Path mapOutputFileName;
final TezIndexRecord indexRecord;
MapOutputInfo(Path mapOutputFileName, TezIndexRecord 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.getHeader(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.setHeader(SecureShuffleUtils.HTTP_HEADER_REPLY_URL_HASH, reply);
// Put shuffle version into http header
response.setHeader(ShuffleHeader.HTTP_HEADER_NAME,
ShuffleHeader.DEFAULT_HTTP_HEADER_NAME);
response.setHeader(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 TezIndexRecord info = mapOutputInfo.indexRecord;
final ShuffleHeader header =
new ShuffleHeader(mapId, info.getPartLength(), info.getRawLength(), 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;
final DefaultFileRegion partition =
new DefaultFileRegion(spill.getChannel(), info.getStartOffset(), info.getPartLength());
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) {
partition.releaseExternalResources();
}
});
return writeFuture;
}
protected void sendError(ChannelHandlerContext ctx,
HttpResponseStatus status) {
sendError(ctx, "", status);
}
protected void sendError(ChannelHandlerContext ctx, String message,
HttpResponseStatus status) {
HttpResponse response = new DefaultHttpResponse(HTTP_1_1, status);
response.setHeader(CONTENT_TYPE, "text/plain; charset=UTF-8");
// Put shuffle version into http header
response.setHeader(ShuffleHeader.HTTP_HEADER_NAME,
ShuffleHeader.DEFAULT_HTTP_HEADER_NAME);
response.setHeader(ShuffleHeader.HTTP_HEADER_VERSION,
ShuffleHeader.DEFAULT_HTTP_HEADER_VERSION);
response.setContent(
ChannelBuffers.copiedBuffer(message, 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);
}
}
}
}