610 lines
22 KiB
C++
610 lines
22 KiB
C++
/*
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* PaxosConfigTransaction.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 "fdbclient/DatabaseContext.h"
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#include "fdbclient/MonitorLeader.h"
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#include "fdbclient/PaxosConfigTransaction.h"
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#include "flow/actorcompiler.h" // must be last include
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using ConfigTransactionInfo = ModelInterface<ConfigTransactionInterface>;
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class CommitQuorum {
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ActorCollection actors{ false };
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std::vector<ConfigTransactionInterface> ctis;
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size_t failed{ 0 };
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size_t successful{ 0 };
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size_t maybeCommitted{ 0 };
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Promise<Void> result;
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Standalone<VectorRef<ConfigMutationRef>> mutations;
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ConfigCommitAnnotation annotation;
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ConfigTransactionCommitRequest getCommitRequest(ConfigGeneration generation,
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CoordinatorsHash coordinatorsHash) const {
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return ConfigTransactionCommitRequest(coordinatorsHash, generation, mutations, annotation);
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}
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void updateResult() {
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if (successful >= ctis.size() / 2 + 1 && result.canBeSet()) {
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result.send(Void());
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} else if (failed >= ctis.size() / 2 + 1 && result.canBeSet()) {
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// Rollforwards could cause a version that didn't have quorum to
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// commit, so send commit_unknown_result instead of commit_failed.
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// Calling sendError could delete this
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auto local = this->result;
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local.sendError(commit_unknown_result());
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} else {
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// Check if it is possible to ever receive quorum agreement
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auto totalRequestsOutstanding = ctis.size() - (failed + successful + maybeCommitted);
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if ((failed + totalRequestsOutstanding < ctis.size() / 2 + 1) &&
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(successful + totalRequestsOutstanding < ctis.size() / 2 + 1) && result.canBeSet()) {
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// Calling sendError could delete this
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auto local = this->result;
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local.sendError(commit_unknown_result());
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}
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}
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}
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ACTOR static Future<Void> addRequestActor(CommitQuorum* self,
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ConfigGeneration generation,
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CoordinatorsHash coordinatorsHash,
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ConfigTransactionInterface cti) {
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try {
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if (cti.hostname.present()) {
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wait(timeoutError(retryGetReplyFromHostname(self->getCommitRequest(generation, coordinatorsHash),
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cti.hostname.get(),
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WLTOKEN_CONFIGTXN_COMMIT),
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CLIENT_KNOBS->COMMIT_QUORUM_TIMEOUT));
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} else {
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wait(timeoutError(cti.commit.getReply(self->getCommitRequest(generation, coordinatorsHash)),
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CLIENT_KNOBS->COMMIT_QUORUM_TIMEOUT));
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}
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++self->successful;
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} catch (Error& e) {
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// self might be destroyed if this actor is cancelled
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if (e.code() == error_code_actor_cancelled) {
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throw;
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}
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if (e.code() == error_code_not_committed || e.code() == error_code_timed_out) {
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++self->failed;
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} else {
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++self->maybeCommitted;
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}
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}
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self->updateResult();
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return Void();
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}
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public:
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CommitQuorum() = default;
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explicit CommitQuorum(std::vector<ConfigTransactionInterface> const& ctis) : ctis(ctis) {}
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void set(KeyRef key, ValueRef value) {
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if (key == configTransactionDescriptionKey) {
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annotation.description = ValueRef(annotation.arena(), value);
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} else {
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mutations.push_back_deep(mutations.arena(),
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IKnobCollection::createSetMutation(mutations.arena(), key, value));
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}
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}
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void clear(KeyRef key) {
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if (key == configTransactionDescriptionKey) {
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annotation.description = ""_sr;
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} else {
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mutations.push_back_deep(mutations.arena(), IKnobCollection::createClearMutation(mutations.arena(), key));
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}
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}
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void setTimestamp() { annotation.timestamp = now(); }
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size_t expectedSize() const { return annotation.expectedSize() + mutations.expectedSize(); }
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Future<Void> commit(ConfigGeneration generation, CoordinatorsHash coordinatorsHash) {
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// Send commit message to all replicas, even those that did not return the used replica.
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// This way, slow replicas are kept up date.
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for (const auto& cti : ctis) {
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actors.add(addRequestActor(this, generation, coordinatorsHash, cti));
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}
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return result.getFuture();
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}
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bool committed() const { return result.isSet() && !result.isError(); }
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};
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class GetGenerationQuorum {
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ActorCollection actors{ false };
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CoordinatorsHash coordinatorsHash{ 0 };
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std::vector<ConfigTransactionInterface> ctis;
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std::map<ConfigGeneration, std::vector<ConfigTransactionInterface>> seenGenerations;
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Promise<ConfigGeneration> result;
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size_t totalRepliesReceived{ 0 };
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size_t maxAgreement{ 0 };
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Future<Void> coordinatorsChangedFuture;
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Optional<Version> lastSeenLiveVersion;
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Future<ConfigGeneration> getGenerationFuture;
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ACTOR static Future<Void> addRequestActor(GetGenerationQuorum* self, ConfigTransactionInterface cti) {
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loop {
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try {
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state ConfigTransactionGetGenerationReply reply;
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if (cti.hostname.present()) {
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wait(timeoutError(store(reply,
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retryGetReplyFromHostname(
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ConfigTransactionGetGenerationRequest{ self->coordinatorsHash,
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self->lastSeenLiveVersion },
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cti.hostname.get(),
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WLTOKEN_CONFIGTXN_GETGENERATION)),
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CLIENT_KNOBS->GET_GENERATION_QUORUM_TIMEOUT));
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} else {
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wait(timeoutError(store(reply,
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cti.getGeneration.getReply(ConfigTransactionGetGenerationRequest{
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self->coordinatorsHash, self->lastSeenLiveVersion })),
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CLIENT_KNOBS->GET_GENERATION_QUORUM_TIMEOUT));
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}
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++self->totalRepliesReceived;
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auto gen = reply.generation;
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self->lastSeenLiveVersion =
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std::max(gen.liveVersion, self->lastSeenLiveVersion.orDefault(::invalidVersion));
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auto& replicas = self->seenGenerations[gen];
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replicas.push_back(cti);
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self->maxAgreement = std::max(replicas.size(), self->maxAgreement);
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// TraceEvent("ConfigTransactionGotGenerationReply")
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// .detail("From", cti.getGeneration.getEndpoint().getPrimaryAddress())
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// .detail("TotalRepliesReceived", self->totalRepliesReceived)
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// .detail("ReplyGeneration", gen.toString())
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// .detail("Replicas", replicas.size())
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// .detail("Coordinators", self->ctis.size())
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// .detail("MaxAgreement", self->maxAgreement)
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// .detail("LastSeenLiveVersion", self->lastSeenLiveVersion);
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if (replicas.size() >= self->ctis.size() / 2 + 1 && !self->result.isSet()) {
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self->result.send(gen);
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} else if (self->maxAgreement + (self->ctis.size() - self->totalRepliesReceived) <
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(self->ctis.size() / 2 + 1)) {
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if (!self->result.isError()) {
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// Calling sendError could delete self
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auto local = self->result;
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local.sendError(failed_to_reach_quorum());
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}
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}
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break;
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} catch (Error& e) {
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if (e.code() == error_code_broken_promise) {
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continue;
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} else if (e.code() == error_code_timed_out) {
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++self->totalRepliesReceived;
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if (self->totalRepliesReceived == self->ctis.size() && self->result.canBeSet() &&
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!self->result.isError()) {
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// Calling sendError could delete self
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auto local = self->result;
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local.sendError(failed_to_reach_quorum());
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}
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break;
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} else {
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throw;
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}
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}
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}
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return Void();
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}
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ACTOR static Future<ConfigGeneration> getGenerationActor(GetGenerationQuorum* self) {
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state int retries = 0;
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loop {
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for (const auto& cti : self->ctis) {
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self->actors.add(addRequestActor(self, cti));
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}
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try {
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choose {
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when(ConfigGeneration generation = wait(self->result.getFuture())) { return generation; }
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when(wait(self->actors.getResult())) { ASSERT(false); }
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}
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} catch (Error& e) {
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if (e.code() == error_code_failed_to_reach_quorum) {
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CODE_PROBE(true, "Failed to reach quorum getting generation");
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if (self->coordinatorsChangedFuture.isReady()) {
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throw coordinators_changed();
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}
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wait(delayJittered(std::clamp(
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0.005 * (1 << std::min(retries, 30)), 0.0, CLIENT_KNOBS->TIMEOUT_RETRY_UPPER_BOUND)));
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if (deterministicRandom()->random01() < 0.05) {
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// Randomly inject a delay of at least the generation
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// reply timeout, to try to prevent contention between
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// clients.
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wait(delay(CLIENT_KNOBS->GET_GENERATION_QUORUM_TIMEOUT *
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(deterministicRandom()->random01() + 1.0)));
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}
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++retries;
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self->actors.clear(false);
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self->seenGenerations.clear();
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self->result.reset();
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self->totalRepliesReceived = 0;
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self->maxAgreement = 0;
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} else {
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throw e;
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}
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}
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}
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}
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public:
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GetGenerationQuorum() = default;
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explicit GetGenerationQuorum(CoordinatorsHash coordinatorsHash,
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std::vector<ConfigTransactionInterface> const& ctis,
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Future<Void> coordinatorsChangedFuture,
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Optional<Version> const& lastSeenLiveVersion = {})
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: coordinatorsHash(coordinatorsHash), ctis(ctis), coordinatorsChangedFuture(coordinatorsChangedFuture),
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lastSeenLiveVersion(lastSeenLiveVersion) {}
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Future<ConfigGeneration> getGeneration() {
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if (!getGenerationFuture.isValid()) {
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getGenerationFuture = getGenerationActor(this);
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}
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return getGenerationFuture;
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}
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bool isReady() const {
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return getGenerationFuture.isValid() && getGenerationFuture.isReady() && !getGenerationFuture.isError();
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}
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Optional<ConfigGeneration> getCachedGeneration() const {
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return isReady() ? getGenerationFuture.get() : Optional<ConfigGeneration>{};
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}
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std::vector<ConfigTransactionInterface> getReadReplicas() const {
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ASSERT(isReady());
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return seenGenerations.at(getGenerationFuture.get());
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}
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Optional<Version> getLastSeenLiveVersion() const { return lastSeenLiveVersion; }
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};
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class PaxosConfigTransactionImpl {
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CoordinatorsHash coordinatorsHash{ 0 };
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std::vector<ConfigTransactionInterface> ctis;
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GetGenerationQuorum getGenerationQuorum;
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CommitQuorum commitQuorum;
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int numRetries{ 0 };
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Optional<UID> dID;
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Database cx;
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Future<Void> watchClusterFileFuture;
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ACTOR static Future<Optional<Value>> get(PaxosConfigTransactionImpl* self, Key key) {
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state ConfigKey configKey = ConfigKey::decodeKey(key);
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loop {
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try {
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state ConfigGeneration generation = wait(self->getGenerationQuorum.getGeneration());
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state std::vector<ConfigTransactionInterface> readReplicas =
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self->getGenerationQuorum.getReadReplicas();
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std::vector<Future<Void>> fs;
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for (ConfigTransactionInterface& readReplica : readReplicas) {
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if (readReplica.hostname.present()) {
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fs.push_back(tryInitializeRequestStream(
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&readReplica.get, readReplica.hostname.get(), WLTOKEN_CONFIGTXN_GET));
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}
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}
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wait(waitForAll(fs));
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state Reference<ConfigTransactionInfo> configNodes(new ConfigTransactionInfo(readReplicas));
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ConfigTransactionGetReply reply = wait(timeoutError(
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basicLoadBalance(configNodes,
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&ConfigTransactionInterface::get,
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ConfigTransactionGetRequest{ self->coordinatorsHash, generation, configKey }),
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CLIENT_KNOBS->GET_KNOB_TIMEOUT));
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if (reply.value.present()) {
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return reply.value.get().toValue();
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} else {
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return Optional<Value>{};
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}
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} catch (Error& e) {
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if (e.code() != error_code_timed_out && e.code() != error_code_broken_promise &&
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e.code() != error_code_coordinators_changed) {
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throw;
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}
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self->reset();
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}
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}
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}
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ACTOR static Future<RangeResult> getConfigClasses(PaxosConfigTransactionImpl* self) {
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loop {
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try {
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state ConfigGeneration generation = wait(self->getGenerationQuorum.getGeneration());
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state std::vector<ConfigTransactionInterface> readReplicas =
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self->getGenerationQuorum.getReadReplicas();
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std::vector<Future<Void>> fs;
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for (ConfigTransactionInterface& readReplica : readReplicas) {
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if (readReplica.hostname.present()) {
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fs.push_back(tryInitializeRequestStream(
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&readReplica.getClasses, readReplica.hostname.get(), WLTOKEN_CONFIGTXN_GETCLASSES));
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}
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}
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wait(waitForAll(fs));
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state Reference<ConfigTransactionInfo> configNodes(new ConfigTransactionInfo(readReplicas));
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ConfigTransactionGetConfigClassesReply reply = wait(
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basicLoadBalance(configNodes,
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&ConfigTransactionInterface::getClasses,
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ConfigTransactionGetConfigClassesRequest{ self->coordinatorsHash, generation }));
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RangeResult result;
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result.reserve(result.arena(), reply.configClasses.size());
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for (const auto& configClass : reply.configClasses) {
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result.push_back_deep(result.arena(), KeyValueRef(configClass, ""_sr));
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}
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return result;
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} catch (Error& e) {
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if (e.code() != error_code_coordinators_changed) {
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throw;
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}
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self->reset();
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}
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}
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}
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ACTOR static Future<RangeResult> getKnobs(PaxosConfigTransactionImpl* self, Optional<Key> configClass) {
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loop {
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try {
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state ConfigGeneration generation = wait(self->getGenerationQuorum.getGeneration());
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state std::vector<ConfigTransactionInterface> readReplicas =
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self->getGenerationQuorum.getReadReplicas();
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std::vector<Future<Void>> fs;
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for (ConfigTransactionInterface& readReplica : readReplicas) {
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if (readReplica.hostname.present()) {
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fs.push_back(tryInitializeRequestStream(
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&readReplica.getKnobs, readReplica.hostname.get(), WLTOKEN_CONFIGTXN_GETKNOBS));
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}
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}
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wait(waitForAll(fs));
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state Reference<ConfigTransactionInfo> configNodes(new ConfigTransactionInfo(readReplicas));
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ConfigTransactionGetKnobsReply reply = wait(basicLoadBalance(
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configNodes,
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&ConfigTransactionInterface::getKnobs,
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ConfigTransactionGetKnobsRequest{ self->coordinatorsHash, generation, configClass }));
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RangeResult result;
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result.reserve(result.arena(), reply.knobNames.size());
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for (const auto& knobName : reply.knobNames) {
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result.push_back_deep(result.arena(), KeyValueRef(knobName, ""_sr));
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}
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return result;
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} catch (Error& e) {
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if (e.code() != error_code_coordinators_changed) {
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throw;
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}
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self->reset();
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}
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}
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}
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ACTOR static Future<Void> commit(PaxosConfigTransactionImpl* self) {
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loop {
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try {
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ConfigGeneration generation = wait(self->getGenerationQuorum.getGeneration());
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self->commitQuorum.setTimestamp();
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wait(self->commitQuorum.commit(generation, self->coordinatorsHash));
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return Void();
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} catch (Error& e) {
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if (e.code() != error_code_coordinators_changed) {
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throw;
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}
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self->reset();
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}
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}
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}
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ACTOR static Future<Void> onError(PaxosConfigTransactionImpl* self, Error e) {
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// TODO: Improve this:
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TraceEvent("ConfigIncrementOnError").error(e).detail("NumRetries", self->numRetries);
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if (e.code() == error_code_transaction_too_old || e.code() == error_code_not_committed) {
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wait(delay(std::clamp((1 << self->numRetries++) * 0.01 * deterministicRandom()->random01(),
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0.0,
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CLIENT_KNOBS->TIMEOUT_RETRY_UPPER_BOUND)));
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self->reset();
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return Void();
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}
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throw e;
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}
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// Returns when the cluster interface updates with a new connection string.
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ACTOR static Future<Void> watchClusterFile(Database cx) {
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state Future<Void> leaderMonitor =
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monitorLeader<ClusterInterface>(cx->getConnectionRecord(), cx->statusClusterInterface);
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state std::string connectionString = cx->getConnectionRecord()->getConnectionString().toString();
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loop {
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wait(cx->statusClusterInterface->onChange());
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if (cx->getConnectionRecord()->getConnectionString().toString() != connectionString) {
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return Void();
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}
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}
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}
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public:
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Future<Version> getReadVersion() {
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return map(getGenerationQuorum.getGeneration(), [](auto const& gen) { return gen.committedVersion; });
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}
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Optional<Version> getCachedReadVersion() const {
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auto gen = getGenerationQuorum.getCachedGeneration();
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if (gen.present()) {
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return gen.get().committedVersion;
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} else {
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return {};
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}
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}
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Version getCommittedVersion() const {
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return commitQuorum.committed() ? getGenerationQuorum.getCachedGeneration().get().liveVersion
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: ::invalidVersion;
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}
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int64_t getApproximateSize() const { return commitQuorum.expectedSize(); }
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void set(KeyRef key, ValueRef value) { commitQuorum.set(key, value); }
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void clear(KeyRef key) { commitQuorum.clear(key); }
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Future<Optional<Value>> get(Key const& key) { return get(this, key); }
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Future<RangeResult> getRange(KeyRangeRef keys) {
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if (keys == configClassKeys) {
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return getConfigClasses(this);
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} else if (keys == globalConfigKnobKeys) {
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return getKnobs(this, {});
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} else if (configKnobKeys.contains(keys) && keys.singleKeyRange()) {
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const auto configClass = keys.begin.removePrefix(configKnobKeys.begin);
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return getKnobs(this, configClass);
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} else {
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throw invalid_config_db_range_read();
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}
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}
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Future<Void> onError(Error const& e) { return onError(this, e); }
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void debugTransaction(UID dID) { this->dID = dID; }
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void reset() {
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ctis.clear();
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// Re-read connection string. If the cluster file changed, this will
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// return the updated value.
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const ClusterConnectionString& cs = cx->getConnectionRecord()->getConnectionString();
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ctis.reserve(cs.hostnames.size() + cs.coords.size());
|
|
for (const auto& h : cs.hostnames) {
|
|
ctis.emplace_back(h);
|
|
}
|
|
for (const auto& c : cs.coords) {
|
|
ctis.emplace_back(c);
|
|
}
|
|
coordinatorsHash = std::hash<std::string>()(cx->getConnectionRecord()->getConnectionString().toString());
|
|
if (!cx->statusLeaderMon.isValid() || cx->statusLeaderMon.isReady()) {
|
|
cx->statusClusterInterface = makeReference<AsyncVar<Optional<ClusterInterface>>>();
|
|
cx->statusLeaderMon = watchClusterFile(cx);
|
|
}
|
|
getGenerationQuorum = GetGenerationQuorum{
|
|
coordinatorsHash, ctis, cx->statusLeaderMon, getGenerationQuorum.getLastSeenLiveVersion()
|
|
};
|
|
commitQuorum = CommitQuorum{ ctis };
|
|
}
|
|
|
|
void fullReset() {
|
|
numRetries = 0;
|
|
dID = {};
|
|
reset();
|
|
}
|
|
|
|
void checkDeferredError(Error const& deferredError) const {
|
|
if (deferredError.code() != invalid_error_code) {
|
|
throw deferredError;
|
|
}
|
|
if (cx.getPtr()) {
|
|
cx->checkDeferredError();
|
|
}
|
|
}
|
|
|
|
Future<Void> commit() { return commit(this); }
|
|
|
|
PaxosConfigTransactionImpl(Database const& cx) : cx(cx) { reset(); }
|
|
|
|
PaxosConfigTransactionImpl(std::vector<ConfigTransactionInterface> const& ctis)
|
|
: ctis(ctis), getGenerationQuorum(0, ctis, Future<Void>()), commitQuorum(ctis) {}
|
|
};
|
|
|
|
Future<Version> PaxosConfigTransaction::getReadVersion() {
|
|
return impl->getReadVersion();
|
|
}
|
|
|
|
Optional<Version> PaxosConfigTransaction::getCachedReadVersion() const {
|
|
return impl->getCachedReadVersion();
|
|
}
|
|
|
|
Future<Optional<Value>> PaxosConfigTransaction::get(Key const& key, Snapshot) {
|
|
return impl->get(key);
|
|
}
|
|
|
|
Future<RangeResult> PaxosConfigTransaction::getRange(KeySelector const& begin,
|
|
KeySelector const& end,
|
|
int limit,
|
|
Snapshot snapshot,
|
|
Reverse reverse) {
|
|
if (reverse) {
|
|
throw client_invalid_operation();
|
|
}
|
|
return impl->getRange(KeyRangeRef(begin.getKey(), end.getKey()));
|
|
}
|
|
|
|
Future<RangeResult> PaxosConfigTransaction::getRange(KeySelector begin,
|
|
KeySelector end,
|
|
GetRangeLimits limits,
|
|
Snapshot snapshot,
|
|
Reverse reverse) {
|
|
if (reverse) {
|
|
throw client_invalid_operation();
|
|
}
|
|
return impl->getRange(KeyRangeRef(begin.getKey(), end.getKey()));
|
|
}
|
|
|
|
void PaxosConfigTransaction::set(KeyRef const& key, ValueRef const& value) {
|
|
return impl->set(key, value);
|
|
}
|
|
|
|
void PaxosConfigTransaction::clear(KeyRef const& key) {
|
|
return impl->clear(key);
|
|
}
|
|
|
|
Future<Void> PaxosConfigTransaction::commit() {
|
|
return impl->commit();
|
|
}
|
|
|
|
Version PaxosConfigTransaction::getCommittedVersion() const {
|
|
return impl->getCommittedVersion();
|
|
}
|
|
|
|
int64_t PaxosConfigTransaction::getApproximateSize() const {
|
|
return impl->getApproximateSize();
|
|
}
|
|
|
|
void PaxosConfigTransaction::setOption(FDBTransactionOptions::Option option, Optional<StringRef> value) {
|
|
// TODO: Support using this option to determine atomicity
|
|
}
|
|
|
|
Future<Void> PaxosConfigTransaction::onError(Error const& e) {
|
|
return impl->onError(e);
|
|
}
|
|
|
|
void PaxosConfigTransaction::cancel() {
|
|
// TODO: Implement someday
|
|
throw client_invalid_operation();
|
|
}
|
|
|
|
void PaxosConfigTransaction::reset() {
|
|
impl->reset();
|
|
}
|
|
|
|
void PaxosConfigTransaction::fullReset() {
|
|
impl->fullReset();
|
|
}
|
|
|
|
void PaxosConfigTransaction::debugTransaction(UID dID) {
|
|
impl->debugTransaction(dID);
|
|
}
|
|
|
|
void PaxosConfigTransaction::checkDeferredError() const {
|
|
impl->checkDeferredError(deferredError);
|
|
}
|
|
|
|
PaxosConfigTransaction::PaxosConfigTransaction(std::vector<ConfigTransactionInterface> const& ctis)
|
|
: impl(PImpl<PaxosConfigTransactionImpl>::create(ctis)) {}
|
|
|
|
PaxosConfigTransaction::PaxosConfigTransaction() = default;
|
|
|
|
PaxosConfigTransaction::~PaxosConfigTransaction() = default;
|
|
|
|
void PaxosConfigTransaction::construct(Database const& cx) {
|
|
impl = PImpl<PaxosConfigTransactionImpl>::create(cx);
|
|
}
|