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Replace synchronized usage with ConcurrentHashMap in *Bootstrap classes (#9458)

Browse Source 
Motivation:

In AbstractBoostrap, options and attrs are LinkedHashMap that are synchronized on for every read, copy/clone, write operation.
When a lot of connections are triggered concurrently on the same bootstrap instance, the synchronized blocks lead to contention, Netty IO threads get blocked, and performance may be severely degraded.

Modifications:

Use ConcurrentHashMap

Result:

Less contention. Fixes https://github.com/netty/netty/issues/9426
This commit is contained in:
Norman Maurer 2019-08-16 15:18:17 +02:00 committed by GitHub
parent 10eb2cd2e6
commit 97361fa2c8
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 50 additions and 102 deletions
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56
transport/src/main/java/io/netty/bootstrap/AbstractBootstrap.java
View File

@ -38,8 +38,9 @@ import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* {@link AbstractBootstrap} is a helper class that makes it easy to bootstrap a {@link Channel}. It support
@ -54,8 +55,8 @@ public abstract class AbstractBootstrap<B extends AbstractBootstrap<B, C>, C ext
@SuppressWarnings("deprecation")
private volatile ChannelFactory<? extends C> channelFactory;
private volatile SocketAddress localAddress;
private final Map<ChannelOption<?>, Object> options = new LinkedHashMap<ChannelOption<?>, Object>();
private final Map<AttributeKey<?>, Object> attrs = new LinkedHashMap<AttributeKey<?>, Object>();
private final Map<ChannelOption<?>, Object> options = new ConcurrentHashMap<ChannelOption<?>, Object>();
private final Map<AttributeKey<?>, Object> attrs = new ConcurrentHashMap<AttributeKey<?>, Object>();
private volatile ChannelHandler handler;
AbstractBootstrap() {
@ -67,13 +68,9 @@ public abstract class AbstractBootstrap<B extends AbstractBootstrap<B, C>, C ext
channelFactory = bootstrap.channelFactory;
handler = bootstrap.handler;
localAddress = bootstrap.localAddress;
synchronized (bootstrap.options) {
options.putAll(bootstrap.options);
}
synchronized (bootstrap.attrs) {
attrs.putAll(bootstrap.attrs);
}
}
/**
* The {@link EventLoopGroup} which is used to handle all the events for the to-be-created
@ -166,14 +163,10 @@ public abstract class AbstractBootstrap<B extends AbstractBootstrap<B, C>, C ext
public <T> B option(ChannelOption<T> option, T value) {
ObjectUtil.checkNotNull(option, "option");
if (value == null) {
synchronized (options) {
options.remove(option);
}
} else {
synchronized (options) {
options.put(option, value);
}
}
return self();
}
@ -184,14 +177,10 @@ public abstract class AbstractBootstrap<B extends AbstractBootstrap<B, C>, C ext
public <T> B attr(AttributeKey<T> key, T value) {
ObjectUtil.checkNotNull(key, "key");
if (value == null) {
synchronized (attrs) {
attrs.remove(key);
}
} else {
synchronized (attrs) {
attrs.put(key, value);
}
}
return self();
}
@ -384,17 +373,6 @@ public abstract class AbstractBootstrap<B extends AbstractBootstrap<B, C>, C ext
*/
public abstract AbstractBootstrapConfig<B, C> config();
static <K, V> Map<K, V> copiedMap(Map<K, V> map) {
final Map<K, V> copied;
synchronized (map) {
if (map.isEmpty()) {
return Collections.emptyMap();
}
copied = new LinkedHashMap<K, V>(map);
}
return Collections.unmodifiableMap(copied);
}
final Map<ChannelOption<?>, Object> options0() {
return options;
}
@ -424,10 +402,18 @@ public abstract class AbstractBootstrap<B extends AbstractBootstrap<B, C>, C ext
return copiedMap(attrs);
}
static void setChannelOptions(
Channel channel, Map<ChannelOption<?>, Object> options, InternalLogger logger) {
for (Map.Entry<ChannelOption<?>, Object> e: options.entrySet()) {
setChannelOption(channel, e.getKey(), e.getValue(), logger);
static <K, V> Map<K, V> copiedMap(Map<K, V> map) {
if (map.isEmpty()) {
return Collections.emptyMap();
}
return Collections.unmodifiableMap(new HashMap<K, V>(map));
}
static void setAttributes(Channel channel, Map.Entry<AttributeKey<?>, Object>[] attrs) {
for (Map.Entry<AttributeKey<?>, Object> e: attrs) {
@SuppressWarnings("unchecked")
AttributeKey<Object> key = (AttributeKey<Object>) e.getKey();
channel.attr(key).set(e.getValue());
}
}
@ -438,6 +424,16 @@ public abstract class AbstractBootstrap<B extends AbstractBootstrap<B, C>, C ext
}
}
@SuppressWarnings("unchecked")
static Map.Entry<AttributeKey<?>, Object>[] newAttrArray(int size) {
return new Map.Entry[size];
}
@SuppressWarnings("unchecked")
static Map.Entry<ChannelOption<?>, Object>[] newOptionArray(int size) {
return new Map.Entry[size];
}
@SuppressWarnings("unchecked")
private static void setChannelOption(
Channel channel, ChannelOption<?> option, Object value, InternalLogger logger) {

17
transport/src/main/java/io/netty/bootstrap/Bootstrap.java
View File

@ -18,7 +18,6 @@ package io.netty.bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;
import io.netty.channel.EventLoop;
@ -27,7 +26,6 @@ import io.netty.resolver.AddressResolver;
import io.netty.resolver.DefaultAddressResolverGroup;
import io.netty.resolver.NameResolver;
import io.netty.resolver.AddressResolverGroup;
import io.netty.util.AttributeKey;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.internal.ObjectUtil;
@ -256,21 +254,12 @@ public class Bootstrap extends AbstractBootstrap<Bootstrap, Channel> {
@Override
@SuppressWarnings("unchecked")
void init(Channel channel) throws Exception {
void init(Channel channel) {
ChannelPipeline p = channel.pipeline();
p.addLast(config.handler());
final Map<ChannelOption<?>, Object> options = options0();
synchronized (options) {
setChannelOptions(channel, options, logger);
}
final Map<AttributeKey<?>, Object> attrs = attrs0();
synchronized (attrs) {
for (Entry<AttributeKey<?>, Object> e: attrs.entrySet()) {
channel.attr((AttributeKey<Object>) e.getKey()).set(e.getValue());
}
}
setChannelOptions(channel, options0().entrySet().toArray(newOptionArray(0)), logger);
setAttributes(channel, attrs0().entrySet().toArray(newAttrArray(0)));
}
@Override

59
transport/src/main/java/io/netty/bootstrap/ServerBootstrap.java
View File

@ -32,9 +32,9 @@ import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
/**
@ -45,8 +45,8 @@ public class ServerBootstrap extends AbstractBootstrap<ServerBootstrap, ServerCh
private static final InternalLogger logger = InternalLoggerFactory.getInstance(ServerBootstrap.class);
private final Map<ChannelOption<?>, Object> childOptions = new LinkedHashMap<ChannelOption<?>, Object>();
private final Map<AttributeKey<?>, Object> childAttrs = new LinkedHashMap<AttributeKey<?>, Object>();
private final Map<ChannelOption<?>, Object> childOptions = new ConcurrentHashMap<ChannelOption<?>, Object>();
private final Map<AttributeKey<?>, Object> childAttrs = new ConcurrentHashMap<AttributeKey<?>, Object>();
private final ServerBootstrapConfig config = new ServerBootstrapConfig(this);
private volatile EventLoopGroup childGroup;
private volatile ChannelHandler childHandler;
@ -57,13 +57,9 @@ public class ServerBootstrap extends AbstractBootstrap<ServerBootstrap, ServerCh
super(bootstrap);
childGroup = bootstrap.childGroup;
childHandler = bootstrap.childHandler;
synchronized (bootstrap.childOptions) {
childOptions.putAll(bootstrap.childOptions);
}
synchronized (bootstrap.childAttrs) {
childAttrs.putAll(bootstrap.childAttrs);
}
}
/**
* Specify the {@link EventLoopGroup} which is used for the parent (acceptor) and the child (client).
@ -96,14 +92,10 @@ public class ServerBootstrap extends AbstractBootstrap<ServerBootstrap, ServerCh
public <T> ServerBootstrap childOption(ChannelOption<T> childOption, T value) {
ObjectUtil.checkNotNull(childOption, "childOption");
if (value == null) {
synchronized (childOptions) {
childOptions.remove(childOption);
}
} else {
synchronized (childOptions) {
childOptions.put(childOption, value);
}
}
return this;
}
@ -130,37 +122,21 @@ public class ServerBootstrap extends AbstractBootstrap<ServerBootstrap, ServerCh
}
@Override
void init(Channel channel) throws Exception {
final Map<ChannelOption<?>, Object> options = options0();
synchronized (options) {
setChannelOptions(channel, options, logger);
}
final Map<AttributeKey<?>, Object> attrs = attrs0();
synchronized (attrs) {
for (Entry<AttributeKey<?>, Object> e: attrs.entrySet()) {
@SuppressWarnings("unchecked")
AttributeKey<Object> key = (AttributeKey<Object>) e.getKey();
channel.attr(key).set(e.getValue());
}
}
void init(Channel channel) {
setChannelOptions(channel, options0().entrySet().toArray(newOptionArray(0)), logger);
setAttributes(channel, attrs0().entrySet().toArray(newAttrArray(0)));
ChannelPipeline p = channel.pipeline();
final EventLoopGroup currentChildGroup = childGroup;
final ChannelHandler currentChildHandler = childHandler;
final Entry<ChannelOption<?>, Object>[] currentChildOptions;
final Entry<AttributeKey<?>, Object>[] currentChildAttrs;
synchronized (childOptions) {
currentChildOptions = childOptions.entrySet().toArray(newOptionArray(0));
}
synchronized (childAttrs) {
currentChildAttrs = childAttrs.entrySet().toArray(newAttrArray(0));
}
final Entry<ChannelOption<?>, Object>[] currentChildOptions =
childOptions.entrySet().toArray(newOptionArray(0));
final Entry<AttributeKey<?>, Object>[] currentChildAttrs = childAttrs.entrySet().toArray(newAttrArray(0));
p.addLast(new ChannelInitializer<Channel>() {
@Override
public void initChannel(final Channel ch) throws Exception {
public void initChannel(final Channel ch) {
final ChannelPipeline pipeline = ch.pipeline();
ChannelHandler handler = config.handler();
if (handler != null) {
@ -191,16 +167,6 @@ public class ServerBootstrap extends AbstractBootstrap<ServerBootstrap, ServerCh
return this;
}
@SuppressWarnings("unchecked")
private static Entry<AttributeKey<?>, Object>[] newAttrArray(int size) {
return new Entry[size];
}
@SuppressWarnings("unchecked")
private static Map.Entry<ChannelOption<?>, Object>[] newOptionArray(int size) {
return new Map.Entry[size];
}
private static class ServerBootstrapAcceptor extends ChannelInboundHandlerAdapter {
private final EventLoopGroup childGroup;
@ -238,10 +204,7 @@ public class ServerBootstrap extends AbstractBootstrap<ServerBootstrap, ServerCh
child.pipeline().addLast(childHandler);
setChannelOptions(child, childOptions, logger);
for (Entry<AttributeKey<?>, Object> e: childAttrs) {
child.attr((AttributeKey<Object>) e.getKey()).set(e.getValue());
}
setAttributes(child, childAttrs);
try {
childGroup.register(child).addListener(new ChannelFutureListener() {