216 lines
8.3 KiB
C++
216 lines
8.3 KiB
C++
/*
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* FailureMonitor.actor.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "fdbrpc/FailureMonitor.h"
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#include "flow/actorcompiler.h" // This must be the last #include.
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ACTOR Future<Void> waitForStateEqual(IFailureMonitor* monitor, Endpoint endpoint, FailureStatus status) {
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loop {
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Future<Void> change = monitor->onStateChanged(endpoint);
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if (monitor->getState(endpoint) == status)
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return Void();
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wait(change);
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}
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}
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ACTOR Future<Void> waitForContinuousFailure(IFailureMonitor* monitor,
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Endpoint endpoint,
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double sustainedFailureDuration,
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double slope) {
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state double startT = now();
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loop {
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wait(monitor->onFailed(endpoint));
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if (monitor->permanentlyFailed(endpoint))
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return Void();
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// X == sustainedFailureDuration + slope * (now()-startT+X)
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double waitDelay = (sustainedFailureDuration + slope * (now() - startT)) / (1 - slope);
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// SOMEDAY: if we know that this process is a server or client we can tune this optimization better
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if (waitDelay <
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std::min(FLOW_KNOBS->CLIENT_REQUEST_INTERVAL,
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FLOW_KNOBS->SERVER_REQUEST_INTERVAL)) // We will not get a failure monitoring update in this amount
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// of time, so there is no point in waiting for changes
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waitDelay = 0;
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choose {
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when(wait(monitor->onStateEqual(endpoint, FailureStatus(false)))) {
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} // SOMEDAY: Use onStateChanged() for efficiency
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when(wait(delay(waitDelay))) { return Void(); }
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}
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}
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}
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Future<Void> IFailureMonitor::onStateEqual(Endpoint const& endpoint, FailureStatus status) {
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if (status == getState(endpoint))
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return Void();
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return waitForStateEqual(this, endpoint, status);
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}
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Future<Void> IFailureMonitor::onFailedFor(Endpoint const& endpoint, double sustainedFailureDuration, double slope) {
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ASSERT(slope < 1.0);
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return waitForContinuousFailure(this, endpoint, sustainedFailureDuration, slope);
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}
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SimpleFailureMonitor::SimpleFailureMonitor() {
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// Mark ourselves as available in FailureMonitor
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const auto& localAddresses = FlowTransport::transport().getLocalAddresses();
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addressStatus[localAddresses.address] = FailureStatus(false);
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if (localAddresses.secondaryAddress.present()) {
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addressStatus[localAddresses.secondaryAddress.get()] = FailureStatus(false);
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}
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}
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void SimpleFailureMonitor::setStatus(NetworkAddress const& address, FailureStatus const& status) {
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// if (status.failed)
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// printf("On machine '%s': Machine '%s' is failed\n", g_network->getLocalAddress().toString().c_str(),
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// address.toString().c_str()); printf("%s.setState(%s, %s) %p\n", g_network->getLocalAddress().toString(),
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// address.toString(), status.failed ? "FAILED" : "OK", this); addressStatus.set( address, status );
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// onStateChanged() will be waiting on endpointKnownFailed only where it is false, so if the address status
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// for an endpoint that is waited on changes, the waiter sees its failure status change
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auto it = addressStatus.find(address);
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if (it == addressStatus.end()) {
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if (status != FailureStatus()) {
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TraceEvent("NotifyAddressHealthy").suppressFor(1.0).detail("Address", address);
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addressStatus[address] = status;
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endpointKnownFailed.triggerRange(Endpoint({ address }, UID()), Endpoint({ address }, UID(-1, -1)));
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}
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} else {
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bool triggerEndpoint = status != it->second;
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if (status != FailureStatus())
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it->second = status;
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else
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addressStatus.erase(it);
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if (triggerEndpoint) {
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if (status.failed) {
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TraceEvent("NotifyAddressFailed").suppressFor(1.0).detail("Address", address);
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} else {
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TraceEvent("NotifyAddressHealthyPresent").suppressFor(1.0).detail("Address", address);
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}
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endpointKnownFailed.triggerRange(Endpoint({ address }, UID()), Endpoint({ address }, UID(-1, -1)));
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}
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}
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}
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void SimpleFailureMonitor::endpointNotFound(Endpoint const& endpoint) {
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// SOMEDAY: Expiration (this "leaks" memory)
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if (endpoint.token.first() == -1) {
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TraceEvent("WellKnownEndpointNotFound")
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.suppressFor(1.0)
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.detail("Address", endpoint.getPrimaryAddress())
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.detail("TokenFirst", endpoint.token.first())
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.detail("TokenSecond", endpoint.token.second());
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return;
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}
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TraceEvent("EndpointNotFound")
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.suppressFor(1.0)
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.detail("Address", endpoint.getPrimaryAddress())
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.detail("Token", endpoint.token);
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if (endpoint.getPrimaryAddress().isPublic()) {
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if (failedEndpoints.size() > 100000) {
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TraceEvent(SevWarnAlways, "TooManyFailedEndpoints").suppressFor(1.0);
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failedEndpoints.clear();
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}
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failedEndpoints.insert(endpoint);
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}
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endpointKnownFailed.trigger(endpoint);
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}
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void SimpleFailureMonitor::notifyDisconnect(NetworkAddress const& address) {
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//TraceEvent("NotifyDisconnect").detail("Address", address);
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endpointKnownFailed.triggerRange(Endpoint({ address }, UID()), Endpoint({ address }, UID(-1, -1)));
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disconnectTriggers.trigger(address);
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}
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Future<Void> SimpleFailureMonitor::onDisconnectOrFailure(Endpoint const& endpoint) {
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// If the endpoint or address is already failed, return right away
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auto i = addressStatus.find(endpoint.getPrimaryAddress());
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if (i == addressStatus.end() || i->second.isFailed() || failedEndpoints.count(endpoint)) {
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TraceEvent("AlreadyDisconnected").detail("Addr", endpoint.getPrimaryAddress()).detail("Tok", endpoint.token);
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return Void();
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}
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// Return when the endpoint is triggered, which means that either the endpoint has become known failed, or the
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// address has changed state (and since it was previously not failed, it must now be failed), or
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// notifyDisconnect() has been called.
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return endpointKnownFailed.onChange(endpoint);
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}
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Future<Void> SimpleFailureMonitor::onDisconnect(NetworkAddress const& address) {
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return disconnectTriggers.onChange(address);
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}
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Future<Void> SimpleFailureMonitor::onStateChanged(Endpoint const& endpoint) {
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// Wait on endpointKnownFailed if it is false, to pick up both endpointNotFound errors (which set it to true)
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// and changes to addressStatus (which trigger a range). Don't wait on endpointKnownFailed if it is true, because
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// failure status for that endpoint can never change (and we could be spuriously triggered by setStatus)
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// Also returns spuriously when notifyDisconnect is called (which doesn't actually change the state), but callers
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// check the state so it's OK
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if (failedEndpoints.count(endpoint))
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return Never();
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else
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return endpointKnownFailed.onChange(endpoint);
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}
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FailureStatus SimpleFailureMonitor::getState(Endpoint const& endpoint) const {
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if (failedEndpoints.count(endpoint))
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return FailureStatus(true);
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else {
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auto a = addressStatus.find(endpoint.getPrimaryAddress());
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if (a == addressStatus.end())
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return FailureStatus();
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else
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return a->second;
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// printf("%s.getState(%s) = %s %p\n", g_network->getLocalAddress().toString(), endpoint.address.toString(),
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// a.failed ? "FAILED" : "OK", this);
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}
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}
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FailureStatus SimpleFailureMonitor::getState(NetworkAddress const& address) const {
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auto a = addressStatus.find(address);
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if (a == addressStatus.end())
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return FailureStatus();
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else
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return a->second;
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}
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bool SimpleFailureMonitor::onlyEndpointFailed(Endpoint const& endpoint) const {
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if (!failedEndpoints.count(endpoint))
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return false;
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auto a = addressStatus.find(endpoint.getPrimaryAddress());
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if (a == addressStatus.end())
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return true;
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else
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return !a->second.failed;
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}
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bool SimpleFailureMonitor::permanentlyFailed(Endpoint const& endpoint) const {
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return failedEndpoints.count(endpoint);
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}
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void SimpleFailureMonitor::reset() {
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addressStatus = std::unordered_map<NetworkAddress, FailureStatus>();
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failedEndpoints = std::unordered_set<Endpoint>();
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endpointKnownFailed.resetNoWaiting();
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}
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