56 lines
2.2 KiB
C++
56 lines
2.2 KiB
C++
/*
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* LoadBalance.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 2013-2022 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/LoadBalance.actor.h"
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#include "flow/flow.h"
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#include "flow/actorcompiler.h" // This must be the last #include.
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// Throwing all_alternatives_failed will cause the client to issue a GetKeyLocationRequest to the proxy, so this actor
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// attempts to limit the number of these errors thrown by a single client to prevent it from saturating the proxies with
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// these requests
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ACTOR Future<Void> allAlternativesFailedDelay(Future<Void> okFuture) {
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if (now() - g_network->networkInfo.newestAlternativesFailure > FLOW_KNOBS->ALTERNATIVES_FAILURE_RESET_TIME) {
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g_network->networkInfo.oldestAlternativesFailure = now();
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}
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double delay = FLOW_KNOBS->ALTERNATIVES_FAILURE_MIN_DELAY;
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if (now() - g_network->networkInfo.lastAlternativesFailureSkipDelay > FLOW_KNOBS->ALTERNATIVES_FAILURE_SKIP_DELAY) {
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g_network->networkInfo.lastAlternativesFailureSkipDelay = now();
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} else {
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double elapsed = now() - g_network->networkInfo.oldestAlternativesFailure;
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delay = std::max(delay,
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std::min(elapsed * FLOW_KNOBS->ALTERNATIVES_FAILURE_DELAY_RATIO,
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FLOW_KNOBS->ALTERNATIVES_FAILURE_MAX_DELAY));
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delay = std::max(delay,
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std::min(elapsed * FLOW_KNOBS->ALTERNATIVES_FAILURE_SLOW_DELAY_RATIO,
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FLOW_KNOBS->ALTERNATIVES_FAILURE_SLOW_MAX_DELAY));
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}
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g_network->networkInfo.newestAlternativesFailure = now();
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choose {
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when(wait(okFuture)) {}
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when(wait(::delayJittered(delay))) {
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throw all_alternatives_failed();
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}
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}
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return Void();
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}
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