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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.hdds.scm;
import com.google.common.base.Preconditions;
import org.apache.ratis.shaded.io.netty.channel.Channel;
import org.apache.ratis.shaded.io.netty.channel.ChannelHandlerContext;
import org.apache.ratis.shaded.io.netty.channel.SimpleChannelInboundHandler;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.hdds.scm.container.common.helpers.Pipeline;
import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos;
import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
.ContainerCommandResponseProto;
import org.apache.hadoop.util.Time;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Iterator;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.Semaphore;
/**
* Netty client handler.
*/
public class XceiverClientHandler extends
SimpleChannelInboundHandler<ContainerCommandResponseProto> {
static final Logger LOG = LoggerFactory.getLogger(XceiverClientHandler.class);
private final ConcurrentMap<String, ResponseFuture> responses =
new ConcurrentHashMap<>();
private final Pipeline pipeline;
private volatile Channel channel;
private XceiverClientMetrics metrics;
private final Semaphore semaphore;
/**
* Constructs a client that can communicate to a container server.
*/
public XceiverClientHandler(Pipeline pipeline, Semaphore semaphore) {
super(false);
Preconditions.checkNotNull(pipeline);
this.pipeline = pipeline;
this.metrics = XceiverClientManager.getXceiverClientMetrics();
this.semaphore = semaphore;
}
/**
* <strong>Please keep in mind that this method will be renamed to {@code
* messageReceived(ChannelHandlerContext, I)} in 5.0.</strong>
* <p>
* Is called for each message of type {@link ContainerProtos
* .ContainerCommandResponseProto}.
*
* @param ctx the {@link ChannelHandlerContext} which this {@link
* SimpleChannelInboundHandler} belongs to
* @param msg the message to handle
* @throws Exception is thrown if an error occurred
*/
@Override
public void channelRead0(ChannelHandlerContext ctx,
ContainerProtos.ContainerCommandResponseProto msg)
throws Exception {
Preconditions.checkNotNull(msg);
metrics.decrPendingContainerOpsMetrics(msg.getCmdType());
String key = msg.getTraceID();
ResponseFuture response = responses.remove(key);
semaphore.release();
if (response != null) {
response.getFuture().complete(msg);
long requestTime = response.getRequestTime();
metrics.addContainerOpsLatency(msg.getCmdType(),
Time.monotonicNowNanos() - requestTime);
} else {
LOG.error("A reply received for message that was not queued. trace " +
"ID: {}", msg.getTraceID());
}
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) {
LOG.debug("channelRegistered: Connected to ctx");
channel = ctx.channel();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
LOG.info("Exception in client " + cause.toString());
Iterator<String> keyIterator = responses.keySet().iterator();
while (keyIterator.hasNext()) {
ResponseFuture response = responses.remove(keyIterator.next());
response.getFuture().completeExceptionally(cause);
semaphore.release();
}
ctx.close();
}
/**
* Since netty is async, we send a work request and then wait until a response
* appears in the reply queue. This is simple sync interface for clients. we
* should consider building async interfaces for client if this turns out to
* be a performance bottleneck.
*
* @param request - request.
* @return -- response
*/
public ContainerCommandResponseProto sendCommand(
ContainerProtos.ContainerCommandRequestProto request)
throws ExecutionException, InterruptedException {
Future<ContainerCommandResponseProto> future = sendCommandAsync(request);
return future.get();
}
/**
* SendCommandAsyc queues a command to the Netty Subsystem and returns a
* CompletableFuture. This Future is marked compeleted in the channelRead0
* when the call comes back.
* @param request - Request to execute
* @return CompletableFuture
*/
public CompletableFuture<ContainerCommandResponseProto> sendCommandAsync(
ContainerProtos.ContainerCommandRequestProto request)
throws InterruptedException {
// Throw an exception of request doesn't have traceId
if (StringUtils.isEmpty(request.getTraceID())) {
throw new IllegalArgumentException("Invalid trace ID");
}
// Setting the datanode ID in the commands, so that we can distinguish
// commands when the cluster simulator is running.
if(!request.hasDatanodeUuid()) {
throw new IllegalArgumentException("Invalid Datanode ID");
}
metrics.incrPendingContainerOpsMetrics(request.getCmdType());
CompletableFuture<ContainerCommandResponseProto> future
= new CompletableFuture<>();
ResponseFuture response = new ResponseFuture(future,
Time.monotonicNowNanos());
semaphore.acquire();
ResponseFuture previous = responses.putIfAbsent(
request.getTraceID(), response);
if (previous != null) {
LOG.error("Command with Trace already exists. Ignoring this command. " +
"{}. Previous Command: {}", request.getTraceID(),
previous.toString());
throw new IllegalStateException("Duplicate trace ID. Command with this " +
"trace ID is already executing. Please ensure that " +
"trace IDs are not reused. ID: " + request.getTraceID());
}
channel.writeAndFlush(request);
return response.getFuture();
}
/**
* Class wraps response future info.
*/
static class ResponseFuture {
private final long requestTime;
private final CompletableFuture<ContainerCommandResponseProto> future;
ResponseFuture(CompletableFuture<ContainerCommandResponseProto> future,
long requestTime) {
this.future = future;
this.requestTime = requestTime;
}
public long getRequestTime() {
return requestTime;
}
public CompletableFuture<ContainerCommandResponseProto> getFuture() {
return future;
}
}
}
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