本文主要研究一下flink的ConnectionManager
flink-release-1.7.2/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/ConnectionManager.java
public interface ConnectionManager {
void start(ResultPartitionProvider partitionProvider,
TaskEventDispatcher taskEventDispatcher) throws IOException;
/**
* Creates a {@link PartitionRequestClient} instance for the given {@link ConnectionID}.
*/
PartitionRequestClient createPartitionRequestClient(ConnectionID connectionId) throws IOException, InterruptedException;
/**
* Closes opened ChannelConnections in case of a resource release.
*/
void closeOpenChannelConnections(ConnectionID connectionId);
int getNumberOfActiveConnections();
int getDataPort();
void shutdown() throws IOException;
}
flink-release-1.7.2/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/LocalConnectionManager.java
public class LocalConnectionManager implements ConnectionManager {
@Override
public void start(ResultPartitionProvider partitionProvider, TaskEventDispatcher taskEventDispatcher) {
}
@Override
public PartitionRequestClient createPartitionRequestClient(ConnectionID connectionId) {
return null;
}
@Override
public void closeOpenChannelConnections(ConnectionID connectionId) {}
@Override
public int getNumberOfActiveConnections() {
return 0;
}
@Override
public int getDataPort() {
return -1;
}
@Override
public void shutdown() {}
}
flink-release-1.7.2/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/NettyConnectionManager.java
public class NettyConnectionManager implements ConnectionManager {
private final NettyServer server;
private final NettyClient client;
private final NettyBufferPool bufferPool;
private final PartitionRequestClientFactory partitionRequestClientFactory;
public NettyConnectionManager(NettyConfig nettyConfig) {
this.server = new NettyServer(nettyConfig);
this.client = new NettyClient(nettyConfig);
this.bufferPool = new NettyBufferPool(nettyConfig.getNumberOfArenas());
this.partitionRequestClientFactory = new PartitionRequestClientFactory(client);
}
@Override
public void start(ResultPartitionProvider partitionProvider, TaskEventDispatcher taskEventDispatcher) throws IOException {
NettyProtocol partitionRequestProtocol = new NettyProtocol(
partitionProvider,
taskEventDispatcher,
client.getConfig().isCreditBasedEnabled());
client.init(partitionRequestProtocol, bufferPool);
server.init(partitionRequestProtocol, bufferPool);
}
@Override
public PartitionRequestClient createPartitionRequestClient(ConnectionID connectionId)
throws IOException, InterruptedException {
return partitionRequestClientFactory.createPartitionRequestClient(connectionId);
}
@Override
public void closeOpenChannelConnections(ConnectionID connectionId) {
partitionRequestClientFactory.closeOpenChannelConnections(connectionId);
}
@Override
public int getNumberOfActiveConnections() {
return partitionRequestClientFactory.getNumberOfActiveClients();
}
@Override
public int getDataPort() {
if (server != null && server.getLocalAddress() != null) {
return server.getLocalAddress().getPort();
} else {
return -1;
}
}
@Override
public void shutdown() {
client.shutdown();
server.shutdown();
}
NettyClient getClient() {
return client;
}
NettyServer getServer() {
return server;
}
NettyBufferPool getBufferPool() {
return bufferPool;
}
}
flink-release-1.7.2/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/PartitionRequestClientFactory.java
class PartitionRequestClientFactory {
private final NettyClient nettyClient;
private final ConcurrentMap<ConnectionID, Object> clients = new ConcurrentHashMap<ConnectionID, Object>();
PartitionRequestClientFactory(NettyClient nettyClient) {
this.nettyClient = nettyClient;
}
/**
* Atomically establishes a TCP connection to the given remote address and
* creates a {@link PartitionRequestClient} instance for this connection.
*/
PartitionRequestClient createPartitionRequestClient(ConnectionID connectionId) throws IOException, InterruptedException {
Object entry;
PartitionRequestClient client = null;
while (client == null) {
entry = clients.get(connectionId);
if (entry != null) {
// Existing channel or connecting channel
if (entry instanceof PartitionRequestClient) {
client = (PartitionRequestClient) entry;
}
else {
ConnectingChannel future = (ConnectingChannel) entry;
client = future.waitForChannel();
clients.replace(connectionId, future, client);
}
}
else {
// No channel yet. Create one, but watch out for a race.
// We create a "connecting future" and atomically add it to the map.
// Only the thread that really added it establishes the channel.
// The others need to wait on that original establisher's future.
ConnectingChannel connectingChannel = new ConnectingChannel(connectionId, this);
Object old = clients.putIfAbsent(connectionId, connectingChannel);
if (old == null) {
nettyClient.connect(connectionId.getAddress()).addListener(connectingChannel);
client = connectingChannel.waitForChannel();
clients.replace(connectionId, connectingChannel, client);
}
else if (old instanceof ConnectingChannel) {
client = ((ConnectingChannel) old).waitForChannel();
clients.replace(connectionId, old, client);
}
else {
client = (PartitionRequestClient) old;
}
}
// Make sure to increment the reference count before handing a client
// out to ensure correct bookkeeping for channel closing.
if (!client.incrementReferenceCounter()) {
destroyPartitionRequestClient(connectionId, client);
client = null;
}
}
return client;
}
public void closeOpenChannelConnections(ConnectionID connectionId) {
Object entry = clients.get(connectionId);
if (entry instanceof ConnectingChannel) {
ConnectingChannel channel = (ConnectingChannel) entry;
if (channel.dispose()) {
clients.remove(connectionId, channel);
}
}
}
int getNumberOfActiveClients() {
return clients.size();
}
/**
* Removes the client for the given {@link ConnectionID}.
*/
void destroyPartitionRequestClient(ConnectionID connectionId, PartitionRequestClient client) {
clients.remove(connectionId, client);
}
//......
}
flink-release-1.7.2/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/PartitionRequestClientFactory.java
private static final class ConnectingChannel implements ChannelFutureListener {
private final Object connectLock = new Object();
private final ConnectionID connectionId;
private final PartitionRequestClientFactory clientFactory;
private boolean disposeRequestClient = false;
public ConnectingChannel(ConnectionID connectionId, PartitionRequestClientFactory clientFactory) {
this.connectionId = connectionId;
this.clientFactory = clientFactory;
}
private boolean dispose() {
boolean result;
synchronized (connectLock) {
if (partitionRequestClient != null) {
result = partitionRequestClient.disposeIfNotUsed();
}
else {
disposeRequestClient = true;
result = true;
}
connectLock.notifyAll();
}
return result;
}
private void handInChannel(Channel channel) {
synchronized (connectLock) {
try {
NetworkClientHandler clientHandler = channel.pipeline().get(NetworkClientHandler.class);
partitionRequestClient = new PartitionRequestClient(
channel, clientHandler, connectionId, clientFactory);
if (disposeRequestClient) {
partitionRequestClient.disposeIfNotUsed();
}
connectLock.notifyAll();
}
catch (Throwable t) {
notifyOfError(t);
}
}
}
private volatile PartitionRequestClient partitionRequestClient;
private volatile Throwable error;
private PartitionRequestClient waitForChannel() throws IOException, InterruptedException {
synchronized (connectLock) {
while (error == null && partitionRequestClient == null) {
connectLock.wait(2000);
}
}
if (error != null) {
throw new IOException("Connecting the channel failed: " + error.getMessage(), error);
}
return partitionRequestClient;
}
private void notifyOfError(Throwable error) {
synchronized (connectLock) {
this.error = error;
connectLock.notifyAll();
}
}
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (future.isSuccess()) {
handInChannel(future.channel());
}
else if (future.cause() != null) {
notifyOfError(new RemoteTransportException(
"Connecting to remote task manager + '" + connectionId.getAddress() +
"' has failed. This might indicate that the remote task " +
"manager has been lost.",
connectionId.getAddress(), future.cause()));
}
else {
notifyOfError(new LocalTransportException(
String.format(
"Connecting to remote task manager '%s' has been cancelled.",
connectionId.getAddress()),
null));
}
}
}
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原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。