| /* |
| * 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.hints; |
| |
| import java.io.File; |
| import java.net.InetAddress; |
| import java.nio.ByteBuffer; |
| import java.util.*; |
| import java.util.concurrent.TimeUnit; |
| import java.util.function.BooleanSupplier; |
| import java.util.function.Function; |
| |
| import com.google.common.util.concurrent.RateLimiter; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.exceptions.RequestFailureReason; |
| import org.apache.cassandra.metrics.HintsServiceMetrics; |
| import org.apache.cassandra.net.IAsyncCallbackWithFailure; |
| import org.apache.cassandra.net.MessageIn; |
| import org.apache.cassandra.net.MessagingService; |
| import org.apache.cassandra.utils.concurrent.SimpleCondition; |
| |
| /** |
| * Dispatches a single hints file to a specified node in a batched manner. |
| * |
| * Uses either {@link EncodedHintMessage} - when dispatching hints into a node with the same messaging version as the hints file, |
| * or {@link HintMessage}, when conversion is required. |
| */ |
| final class HintsDispatcher implements AutoCloseable |
| { |
| private static final Logger logger = LoggerFactory.getLogger(HintsDispatcher.class); |
| |
| private enum Action { CONTINUE, ABORT } |
| |
| private final HintsReader reader; |
| private final UUID hostId; |
| private final InetAddress address; |
| private final int messagingVersion; |
| private final BooleanSupplier abortRequested; |
| |
| private InputPosition currentPagePosition; |
| |
| private HintsDispatcher(HintsReader reader, UUID hostId, InetAddress address, int messagingVersion, BooleanSupplier abortRequested) |
| { |
| currentPagePosition = null; |
| |
| this.reader = reader; |
| this.hostId = hostId; |
| this.address = address; |
| this.messagingVersion = messagingVersion; |
| this.abortRequested = abortRequested; |
| } |
| |
| static HintsDispatcher create(File file, RateLimiter rateLimiter, InetAddress address, UUID hostId, BooleanSupplier abortRequested) |
| { |
| int messagingVersion = MessagingService.instance().getVersion(address); |
| return new HintsDispatcher(HintsReader.open(file, rateLimiter), hostId, address, messagingVersion, abortRequested); |
| } |
| |
| public void close() |
| { |
| reader.close(); |
| } |
| |
| void seek(InputPosition position) |
| { |
| reader.seek(position); |
| } |
| |
| /** |
| * @return whether or not dispatch completed entirely and successfully |
| */ |
| boolean dispatch() |
| { |
| for (HintsReader.Page page : reader) |
| { |
| currentPagePosition = page.position; |
| if (dispatch(page) != Action.CONTINUE) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /** |
| * @return offset of the first non-delivered page |
| */ |
| InputPosition dispatchPosition() |
| { |
| return currentPagePosition; |
| } |
| |
| |
| // retry in case of a timeout; stop in case of a failure, host going down, or delivery paused |
| private Action dispatch(HintsReader.Page page) |
| { |
| return sendHintsAndAwait(page); |
| } |
| |
| private Action sendHintsAndAwait(HintsReader.Page page) |
| { |
| Collection<Callback> callbacks = new ArrayList<>(); |
| |
| /* |
| * If hints file messaging version matches the version of the target host, we'll use the optimised path - |
| * skipping the redundant decoding/encoding cycle of the already encoded hint. |
| * |
| * If that is not the case, we'll need to perform conversion to a newer (or an older) format, and decoding the hint |
| * is an unavoidable intermediate step. |
| */ |
| Action action = reader.descriptor().messagingVersion() == messagingVersion |
| ? sendHints(page.buffersIterator(), callbacks, this::sendEncodedHint) |
| : sendHints(page.hintsIterator(), callbacks, this::sendHint); |
| |
| if (action == Action.ABORT) |
| return action; |
| |
| boolean hadFailures = false; |
| for (Callback cb : callbacks) |
| { |
| Callback.Outcome outcome = cb.await(); |
| updateMetrics(outcome); |
| |
| if (outcome != Callback.Outcome.SUCCESS) |
| hadFailures = true; |
| } |
| |
| return hadFailures ? Action.ABORT : Action.CONTINUE; |
| } |
| |
| private void updateMetrics(Callback.Outcome outcome) |
| { |
| switch (outcome) |
| { |
| case SUCCESS: |
| HintsServiceMetrics.hintsSucceeded.mark(); |
| break; |
| case FAILURE: |
| HintsServiceMetrics.hintsFailed.mark(); |
| break; |
| case TIMEOUT: |
| HintsServiceMetrics.hintsTimedOut.mark(); |
| break; |
| } |
| } |
| |
| /* |
| * Sending hints in compatibility mode. |
| */ |
| |
| private <T> Action sendHints(Iterator<T> hints, Collection<Callback> callbacks, Function<T, Callback> sendFunction) |
| { |
| while (hints.hasNext()) |
| { |
| if (abortRequested.getAsBoolean()) |
| return Action.ABORT; |
| callbacks.add(sendFunction.apply(hints.next())); |
| } |
| return Action.CONTINUE; |
| } |
| |
| private Callback sendHint(Hint hint) |
| { |
| Callback callback = new Callback(); |
| HintMessage message = new HintMessage(hostId, hint); |
| MessagingService.instance().sendRRWithFailure(message.createMessageOut(), address, callback); |
| return callback; |
| } |
| |
| /* |
| * Sending hints in raw mode. |
| */ |
| |
| private Callback sendEncodedHint(ByteBuffer hint) |
| { |
| Callback callback = new Callback(); |
| EncodedHintMessage message = new EncodedHintMessage(hostId, hint, messagingVersion); |
| MessagingService.instance().sendRRWithFailure(message.createMessageOut(), address, callback); |
| return callback; |
| } |
| |
| private static final class Callback implements IAsyncCallbackWithFailure |
| { |
| enum Outcome { SUCCESS, TIMEOUT, FAILURE, INTERRUPTED } |
| |
| private final long start = System.nanoTime(); |
| private final SimpleCondition condition = new SimpleCondition(); |
| private volatile Outcome outcome; |
| |
| Outcome await() |
| { |
| long timeout = TimeUnit.MILLISECONDS.toNanos(MessagingService.Verb.HINT.getTimeout()) - (System.nanoTime() - start); |
| boolean timedOut; |
| |
| try |
| { |
| timedOut = !condition.await(timeout, TimeUnit.NANOSECONDS); |
| } |
| catch (InterruptedException e) |
| { |
| logger.warn("Hint dispatch was interrupted", e); |
| return Outcome.INTERRUPTED; |
| } |
| |
| return timedOut ? Outcome.TIMEOUT : outcome; |
| } |
| |
| public void onFailure(InetAddress from, RequestFailureReason failureReason) |
| { |
| outcome = Outcome.FAILURE; |
| condition.signalAll(); |
| } |
| |
| public void response(MessageIn msg) |
| { |
| outcome = Outcome.SUCCESS; |
| condition.signalAll(); |
| } |
| |
| public boolean isLatencyForSnitch() |
| { |
| return false; |
| } |
| |
| @Override |
| public boolean supportsBackPressure() |
| { |
| return true; |
| } |
| } |
| } |