org.apache.flink.runtime.io.network.netty.PartitionRequestServerHandler Maven / Gradle / Ivy
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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.flink.runtime.io.network.netty;
import org.apache.flink.runtime.io.network.NetworkSequenceViewReader;
import org.apache.flink.runtime.io.network.TaskEventDispatcher;
import org.apache.flink.runtime.io.network.netty.NettyMessage.AddCredit;
import org.apache.flink.runtime.io.network.netty.NettyMessage.CancelPartitionRequest;
import org.apache.flink.runtime.io.network.netty.NettyMessage.CloseRequest;
import org.apache.flink.runtime.io.network.partition.PartitionNotFoundException;
import org.apache.flink.runtime.io.network.partition.ResultPartitionProvider;
import org.apache.flink.runtime.io.network.partition.consumer.InputChannelID;
import org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext;
import org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.flink.runtime.io.network.netty.NettyMessage.PartitionRequest;
import static org.apache.flink.runtime.io.network.netty.NettyMessage.TaskEventRequest;
/**
* Channel handler to initiate data transfers and dispatch backwards flowing task events.
*/
class PartitionRequestServerHandler extends SimpleChannelInboundHandler {
private static final Logger LOG = LoggerFactory.getLogger(PartitionRequestServerHandler.class);
private final ResultPartitionProvider partitionProvider;
private final TaskEventDispatcher taskEventDispatcher;
private final PartitionRequestQueue outboundQueue;
private final boolean creditBasedEnabled;
PartitionRequestServerHandler(
ResultPartitionProvider partitionProvider,
TaskEventDispatcher taskEventDispatcher,
PartitionRequestQueue outboundQueue,
boolean creditBasedEnabled) {
this.partitionProvider = partitionProvider;
this.taskEventDispatcher = taskEventDispatcher;
this.outboundQueue = outboundQueue;
this.creditBasedEnabled = creditBasedEnabled;
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
super.channelRegistered(ctx);
}
@Override
public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
super.channelUnregistered(ctx);
}
@Override
protected void channelRead0(ChannelHandlerContext ctx, NettyMessage msg) throws Exception {
try {
Class msgClazz = msg.getClass();
// ----------------------------------------------------------------
// Intermediate result partition requests
// ----------------------------------------------------------------
if (msgClazz == PartitionRequest.class) {
PartitionRequest request = (PartitionRequest) msg;
LOG.debug("Read channel on {}: {}.", ctx.channel().localAddress(), request);
try {
NetworkSequenceViewReader reader;
if (creditBasedEnabled) {
reader = new CreditBasedSequenceNumberingViewReader(
request.receiverId,
request.credit,
outboundQueue);
} else {
reader = new SequenceNumberingViewReader(
request.receiverId,
outboundQueue);
}
reader.requestSubpartitionView(
partitionProvider,
request.partitionId,
request.queueIndex);
outboundQueue.notifyReaderCreated(reader);
} catch (PartitionNotFoundException notFound) {
respondWithError(ctx, notFound, request.receiverId);
}
}
// ----------------------------------------------------------------
// Task events
// ----------------------------------------------------------------
else if (msgClazz == TaskEventRequest.class) {
TaskEventRequest request = (TaskEventRequest) msg;
if (!taskEventDispatcher.publish(request.partitionId, request.event)) {
respondWithError(ctx, new IllegalArgumentException("Task event receiver not found."), request.receiverId);
}
} else if (msgClazz == CancelPartitionRequest.class) {
CancelPartitionRequest request = (CancelPartitionRequest) msg;
outboundQueue.cancel(request.receiverId);
} else if (msgClazz == CloseRequest.class) {
outboundQueue.close();
} else if (msgClazz == AddCredit.class) {
AddCredit request = (AddCredit) msg;
outboundQueue.addCredit(request.receiverId, request.credit);
} else {
LOG.warn("Received unexpected client request: {}", msg);
}
} catch (Throwable t) {
respondWithError(ctx, t);
}
}
private void respondWithError(ChannelHandlerContext ctx, Throwable error) {
ctx.writeAndFlush(new NettyMessage.ErrorResponse(error));
}
private void respondWithError(ChannelHandlerContext ctx, Throwable error, InputChannelID sourceId) {
LOG.debug("Responding with error: {}.", error.getClass());
ctx.writeAndFlush(new NettyMessage.ErrorResponse(error, sourceId));
}
}