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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.net;
import java.util.Collection;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import java.util.function.Consumer;
import java.util.function.ToLongFunction;
import com.google.common.annotations.VisibleForTesting;
import io.netty.channel.Channel;
import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.metrics.InternodeInboundMetrics;
import org.apache.cassandra.net.Message.Header;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static org.apache.cassandra.utils.MonotonicClock.approxTime;
/**
* An aggregation of {@link InboundMessageHandler}s for all connections from a peer.
*
* Manages metrics and shared resource limits. Can have multiple connections of a single
* type open simultaneousely (legacy in particular).
*/
public final class InboundMessageHandlers
{
private final InetAddressAndPort self;
private final InetAddressAndPort peer;
private final int queueCapacity;
private final ResourceLimits.Limit endpointReserveCapacity;
private final ResourceLimits.Limit globalReserveCapacity;
private final InboundMessageHandler.WaitQueue endpointWaitQueue;
private final InboundMessageHandler.WaitQueue globalWaitQueue;
private final InboundCounters urgentCounters = new InboundCounters();
private final InboundCounters smallCounters = new InboundCounters();
private final InboundCounters largeCounters = new InboundCounters();
private final InboundCounters legacyCounters = new InboundCounters();
private final InboundMessageCallbacks urgentCallbacks;
private final InboundMessageCallbacks smallCallbacks;
private final InboundMessageCallbacks largeCallbacks;
private final InboundMessageCallbacks legacyCallbacks;
private final InternodeInboundMetrics metrics;
private final MessageConsumer messageConsumer;
private final HandlerProvider handlerProvider;
private final Collection handlers = new CopyOnWriteArrayList<>();
static class GlobalResourceLimits
{
final ResourceLimits.Limit reserveCapacity;
final InboundMessageHandler.WaitQueue waitQueue;
GlobalResourceLimits(ResourceLimits.Limit reserveCapacity)
{
this.reserveCapacity = reserveCapacity;
this.waitQueue = InboundMessageHandler.WaitQueue.global(reserveCapacity);
}
}
public interface MessageConsumer extends Consumer>
{
void fail(Message.Header header, Throwable failure);
}
public interface GlobalMetricCallbacks
{
LatencyConsumer internodeLatencyRecorder(InetAddressAndPort to);
void recordInternalLatency(Verb verb, long timeElapsed, TimeUnit timeUnit);
void recordInternodeDroppedMessage(Verb verb, long timeElapsed, TimeUnit timeUnit);
}
public InboundMessageHandlers(InetAddressAndPort self,
InetAddressAndPort peer,
int queueCapacity,
long endpointReserveCapacity,
GlobalResourceLimits globalResourceLimits,
GlobalMetricCallbacks globalMetricCallbacks,
MessageConsumer messageConsumer)
{
this(self, peer, queueCapacity, endpointReserveCapacity, globalResourceLimits, globalMetricCallbacks, messageConsumer, InboundMessageHandler::new);
}
public InboundMessageHandlers(InetAddressAndPort self,
InetAddressAndPort peer,
int queueCapacity,
long endpointReserveCapacity,
GlobalResourceLimits globalResourceLimits,
GlobalMetricCallbacks globalMetricCallbacks,
MessageConsumer messageConsumer,
HandlerProvider handlerProvider)
{
this.self = self;
this.peer = peer;
this.queueCapacity = queueCapacity;
this.endpointReserveCapacity = new ResourceLimits.Concurrent(endpointReserveCapacity);
this.globalReserveCapacity = globalResourceLimits.reserveCapacity;
this.endpointWaitQueue = InboundMessageHandler.WaitQueue.endpoint(this.endpointReserveCapacity);
this.globalWaitQueue = globalResourceLimits.waitQueue;
this.messageConsumer = messageConsumer;
this.handlerProvider = handlerProvider;
urgentCallbacks = makeMessageCallbacks(peer, urgentCounters, globalMetricCallbacks, messageConsumer);
smallCallbacks = makeMessageCallbacks(peer, smallCounters, globalMetricCallbacks, messageConsumer);
largeCallbacks = makeMessageCallbacks(peer, largeCounters, globalMetricCallbacks, messageConsumer);
legacyCallbacks = makeMessageCallbacks(peer, legacyCounters, globalMetricCallbacks, messageConsumer);
metrics = new InternodeInboundMetrics(peer, this);
}
InboundMessageHandler createHandler(FrameDecoder frameDecoder, ConnectionType type, Channel channel, int version)
{
InboundMessageHandler handler =
handlerProvider.provide(frameDecoder,
type,
channel,
self,
peer,
version,
OutboundConnections.LARGE_MESSAGE_THRESHOLD,
queueCapacity,
endpointReserveCapacity,
globalReserveCapacity,
endpointWaitQueue,
globalWaitQueue,
this::onHandlerClosed,
callbacksFor(type),
messageConsumer);
handlers.add(handler);
return handler;
}
void releaseMetrics()
{
metrics.release();
}
private void onHandlerClosed(AbstractMessageHandler handler)
{
assert handler instanceof InboundMessageHandler;
handlers.remove(handler);
absorbCounters((InboundMessageHandler)handler);
}
@VisibleForTesting
public int count()
{
return handlers.size();
}
/*
* Message callbacks
*/
private InboundMessageCallbacks callbacksFor(ConnectionType type)
{
switch (type)
{
case URGENT_MESSAGES: return urgentCallbacks;
case SMALL_MESSAGES: return smallCallbacks;
case LARGE_MESSAGES: return largeCallbacks;
case LEGACY_MESSAGES: return legacyCallbacks;
}
throw new IllegalArgumentException();
}
private static InboundMessageCallbacks makeMessageCallbacks(InetAddressAndPort peer, InboundCounters counters, GlobalMetricCallbacks globalMetrics, MessageConsumer messageConsumer)
{
LatencyConsumer internodeLatency = globalMetrics.internodeLatencyRecorder(peer);
return new InboundMessageCallbacks()
{
@Override
public void onHeaderArrived(int messageSize, Header header, long timeElapsed, TimeUnit unit)
{
// do not log latency if we are within error bars of zero
if (timeElapsed > unit.convert(approxTime.error(), NANOSECONDS))
internodeLatency.accept(timeElapsed, unit);
}
@Override
public void onArrived(int messageSize, Header header, long timeElapsed, TimeUnit unit)
{
}
@Override
public void onArrivedExpired(int messageSize, Header header, boolean wasCorrupt, long timeElapsed, TimeUnit unit)
{
counters.addExpired(messageSize);
globalMetrics.recordInternodeDroppedMessage(header.verb, timeElapsed, unit);
}
@Override
public void onArrivedCorrupt(int messageSize, Header header, long timeElapsed, TimeUnit unit)
{
counters.addError(messageSize);
messageConsumer.fail(header, new Crc.InvalidCrc(0, 0)); // could use one of the original exceptions?
}
@Override
public void onClosedBeforeArrival(int messageSize, Header header, int bytesReceived, boolean wasCorrupt, boolean wasExpired)
{
counters.addError(messageSize);
messageConsumer.fail(header, new InvalidSerializedSizeException(header.verb, messageSize, bytesReceived));
}
@Override
public void onExpired(int messageSize, Header header, long timeElapsed, TimeUnit unit)
{
counters.addExpired(messageSize);
globalMetrics.recordInternodeDroppedMessage(header.verb, timeElapsed, unit);
}
@Override
public void onFailedDeserialize(int messageSize, Header header, Throwable t)
{
counters.addError(messageSize);
/*
* If an exception is caught during deser, return a failure response immediately
* instead of waiting for the callback on the other end to expire.
*/
messageConsumer.fail(header, t);
}
@Override
public void onDispatched(int messageSize, Header header)
{
counters.addPending(messageSize);
}
@Override
public void onExecuting(int messageSize, Header header, long timeElapsed, TimeUnit unit)
{
globalMetrics.recordInternalLatency(header.verb, timeElapsed, unit);
}
@Override
public void onExecuted(int messageSize, Header header, long timeElapsed, TimeUnit unit)
{
counters.removePending(messageSize);
}
@Override
public void onProcessed(int messageSize, Header header)
{
counters.addProcessed(messageSize);
}
};
}
/*
* Aggregated counters
*/
InboundCounters countersFor(ConnectionType type)
{
switch (type)
{
case URGENT_MESSAGES: return urgentCounters;
case SMALL_MESSAGES: return smallCounters;
case LARGE_MESSAGES: return largeCounters;
case LEGACY_MESSAGES: return legacyCounters;
}
throw new IllegalArgumentException();
}
public long receivedCount()
{
return sumHandlers(h -> h.receivedCount) + closedReceivedCount;
}
public long receivedBytes()
{
return sumHandlers(h -> h.receivedBytes) + closedReceivedBytes;
}
public long throttledCount()
{
return sumHandlers(h -> h.throttledCount) + closedThrottledCount;
}
public long throttledNanos()
{
return sumHandlers(h -> h.throttledNanos) + closedThrottledNanos;
}
public long usingCapacity()
{
return sumHandlers(h -> h.queueSize);
}
public long usingEndpointReserveCapacity()
{
return endpointReserveCapacity.using();
}
public long corruptFramesRecovered()
{
return sumHandlers(h -> h.corruptFramesRecovered) + closedCorruptFramesRecovered;
}
public long corruptFramesUnrecovered()
{
return sumHandlers(h -> h.corruptFramesUnrecovered) + closedCorruptFramesUnrecovered;
}
public long errorCount()
{
return sumCounters(InboundCounters::errorCount);
}
public long errorBytes()
{
return sumCounters(InboundCounters::errorBytes);
}
public long expiredCount()
{
return sumCounters(InboundCounters::expiredCount);
}
public long expiredBytes()
{
return sumCounters(InboundCounters::expiredBytes);
}
public long processedCount()
{
return sumCounters(InboundCounters::processedCount);
}
public long processedBytes()
{
return sumCounters(InboundCounters::processedBytes);
}
public long scheduledCount()
{
return sumCounters(InboundCounters::scheduledCount);
}
public long scheduledBytes()
{
return sumCounters(InboundCounters::scheduledBytes);
}
/*
* 'Archived' counter values, combined for all connections that have been closed.
*/
private volatile long closedReceivedCount, closedReceivedBytes;
private static final AtomicLongFieldUpdater closedReceivedCountUpdater =
AtomicLongFieldUpdater.newUpdater(InboundMessageHandlers.class, "closedReceivedCount");
private static final AtomicLongFieldUpdater closedReceivedBytesUpdater =
AtomicLongFieldUpdater.newUpdater(InboundMessageHandlers.class, "closedReceivedBytes");
private volatile long closedThrottledCount, closedThrottledNanos;
private static final AtomicLongFieldUpdater closedThrottledCountUpdater =
AtomicLongFieldUpdater.newUpdater(InboundMessageHandlers.class, "closedThrottledCount");
private static final AtomicLongFieldUpdater closedThrottledNanosUpdater =
AtomicLongFieldUpdater.newUpdater(InboundMessageHandlers.class, "closedThrottledNanos");
private volatile long closedCorruptFramesRecovered, closedCorruptFramesUnrecovered;
private static final AtomicLongFieldUpdater closedCorruptFramesRecoveredUpdater =
AtomicLongFieldUpdater.newUpdater(InboundMessageHandlers.class, "closedCorruptFramesRecovered");
private static final AtomicLongFieldUpdater closedCorruptFramesUnrecoveredUpdater =
AtomicLongFieldUpdater.newUpdater(InboundMessageHandlers.class, "closedCorruptFramesUnrecovered");
private void absorbCounters(InboundMessageHandler handler)
{
closedReceivedCountUpdater.addAndGet(this, handler.receivedCount);
closedReceivedBytesUpdater.addAndGet(this, handler.receivedBytes);
closedThrottledCountUpdater.addAndGet(this, handler.throttledCount);
closedThrottledNanosUpdater.addAndGet(this, handler.throttledNanos);
closedCorruptFramesRecoveredUpdater.addAndGet(this, handler.corruptFramesRecovered);
closedCorruptFramesUnrecoveredUpdater.addAndGet(this, handler.corruptFramesUnrecovered);
}
private long sumHandlers(ToLongFunction counter)
{
long sum = 0L;
for (InboundMessageHandler h : handlers)
sum += counter.applyAsLong(h);
return sum;
}
private long sumCounters(ToLongFunction mapping)
{
return mapping.applyAsLong(urgentCounters)
+ mapping.applyAsLong(smallCounters)
+ mapping.applyAsLong(largeCounters)
+ mapping.applyAsLong(legacyCounters);
}
interface HandlerProvider
{
InboundMessageHandler provide(FrameDecoder decoder,
ConnectionType type,
Channel channel,
InetAddressAndPort self,
InetAddressAndPort peer,
int version,
int largeMessageThreshold,
int queueCapacity,
ResourceLimits.Limit endpointReserveCapacity,
ResourceLimits.Limit globalReserveCapacity,
InboundMessageHandler.WaitQueue endpointWaitQueue,
InboundMessageHandler.WaitQueue globalWaitQueue,
InboundMessageHandler.OnHandlerClosed onClosed,
InboundMessageCallbacks callbacks,
Consumer> consumer);
}
}
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