| /* |
| * 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.nio.ByteBuffer; |
| import java.util.*; |
| 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.net.RequestCallback; |
| import org.apache.cassandra.exceptions.RequestFailureReason; |
| import org.apache.cassandra.io.util.File; |
| import org.apache.cassandra.locator.InetAddressAndPort; |
| import org.apache.cassandra.metrics.HintsServiceMetrics; |
| import org.apache.cassandra.net.Message; |
| import org.apache.cassandra.net.MessagingService; |
| import org.apache.cassandra.utils.concurrent.Condition; |
| |
| |
| import static org.apache.cassandra.hints.HintsDispatcher.Callback.Outcome.*; |
| import static org.apache.cassandra.metrics.HintsServiceMetrics.updateDelayMetrics; |
| import static org.apache.cassandra.net.Verb.HINT_REQ; |
| import static org.apache.cassandra.utils.MonotonicClock.Global.approxTime; |
| import static org.apache.cassandra.utils.concurrent.Condition.newOneTimeCondition; |
| |
| /** |
| * Dispatches a single hints file to a specified node in a batched manner. |
| * |
| * Uses either {@link HintMessage.Encoded} - 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; |
| final UUID hostId; |
| final InetAddressAndPort address; |
| private final int messagingVersion; |
| private final BooleanSupplier abortRequested; |
| |
| private InputPosition currentPagePosition; |
| |
| private HintsDispatcher(HintsReader reader, UUID hostId, InetAddressAndPort 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, InetAddressAndPort address, UUID hostId, BooleanSupplier abortRequested) |
| { |
| int messagingVersion = MessagingService.instance().versions.get(address); |
| HintsDispatcher dispatcher = new HintsDispatcher(HintsReader.open(file, rateLimiter), hostId, address, messagingVersion, abortRequested); |
| HintDiagnostics.dispatcherCreated(dispatcher); |
| return dispatcher; |
| } |
| |
| public void close() |
| { |
| HintDiagnostics.dispatcherClosed(this); |
| 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) |
| { |
| HintDiagnostics.dispatchPage(this); |
| 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; |
| |
| long success = 0, failures = 0, timeouts = 0; |
| for (Callback cb : callbacks) |
| { |
| Callback.Outcome outcome = cb.await(); |
| if (outcome == Callback.Outcome.SUCCESS) success++; |
| else if (outcome == Callback.Outcome.FAILURE) failures++; |
| else if (outcome == Callback.Outcome.TIMEOUT) timeouts++; |
| } |
| |
| updateMetrics(success, failures, timeouts); |
| |
| if (failures > 0 || timeouts > 0) |
| { |
| HintDiagnostics.pageFailureResult(this, success, failures, timeouts); |
| return Action.ABORT; |
| } |
| else |
| { |
| HintDiagnostics.pageSuccessResult(this, success, failures, timeouts); |
| return Action.CONTINUE; |
| } |
| } |
| |
| private void updateMetrics(long success, long failures, long timeouts) |
| { |
| HintsServiceMetrics.hintsSucceeded.mark(success); |
| HintsServiceMetrics.hintsFailed.mark(failures); |
| HintsServiceMetrics.hintsTimedOut.mark(timeouts); |
| } |
| |
| /* |
| * 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()) |
| { |
| HintDiagnostics.abortRequested(this); |
| return Action.ABORT; |
| } |
| callbacks.add(sendFunction.apply(hints.next())); |
| } |
| return Action.CONTINUE; |
| } |
| |
| private Callback sendHint(Hint hint) |
| { |
| Callback callback = new Callback(hint.creationTime); |
| Message<?> message = Message.out(HINT_REQ, new HintMessage(hostId, hint)); |
| MessagingService.instance().sendWithCallback(message, address, callback); |
| return callback; |
| } |
| |
| /* |
| * Sending hints in raw mode. |
| */ |
| |
| private Callback sendEncodedHint(ByteBuffer hint) |
| { |
| HintMessage.Encoded message = new HintMessage.Encoded(hostId, hint, messagingVersion); |
| Callback callback = new Callback(message.getHintCreationTime()); |
| MessagingService.instance().sendWithCallback(Message.out(HINT_REQ, message), address, callback); |
| return callback; |
| } |
| |
| static final class Callback implements RequestCallback |
| { |
| enum Outcome { SUCCESS, TIMEOUT, FAILURE, INTERRUPTED } |
| |
| private final long start = approxTime.now(); |
| private final Condition condition = newOneTimeCondition(); |
| private volatile Outcome outcome; |
| private final long hintCreationNanoTime; |
| |
| private Callback(long hintCreationTimeMillisSinceEpoch) |
| { |
| this.hintCreationNanoTime = approxTime.translate().fromMillisSinceEpoch(hintCreationTimeMillisSinceEpoch); |
| } |
| |
| Outcome await() |
| { |
| boolean timedOut; |
| try |
| { |
| timedOut = !condition.awaitUntil(HINT_REQ.expiresAtNanos(start)); |
| } |
| catch (InterruptedException e) |
| { |
| logger.warn("Hint dispatch was interrupted", e); |
| return INTERRUPTED; |
| } |
| |
| return timedOut ? TIMEOUT : outcome; |
| } |
| |
| @Override |
| public boolean invokeOnFailure() |
| { |
| return true; |
| } |
| |
| @Override |
| public void onFailure(InetAddressAndPort from, RequestFailureReason failureReason) |
| { |
| outcome = FAILURE; |
| condition.signalAll(); |
| } |
| |
| @Override |
| public void onResponse(Message msg) |
| { |
| updateDelayMetrics(msg.from(), approxTime.now() - this.hintCreationNanoTime); |
| outcome = SUCCESS; |
| condition.signalAll(); |
| } |
| } |
| } |