336 lines
13 KiB
C++
336 lines
13 KiB
C++
/*
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* masterserver.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 <iterator>
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#include "fdbrpc/sim_validation.h"
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#include "fdbserver/CoordinatedState.h"
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#include "fdbserver/CoordinationInterface.h" // copy constructors for ServerCoordinators class
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#include "fdbserver/Knobs.h"
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#include "fdbserver/MasterInterface.h"
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#include "fdbserver/ResolutionBalancer.actor.h"
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#include "fdbserver/ServerDBInfo.h"
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#include "flow/ActorCollection.h"
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#include "flow/Trace.h"
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#include "flow/actorcompiler.h" // This must be the last #include.
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struct MasterData : NonCopyable, ReferenceCounted<MasterData> {
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UID dbgid;
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Version lastEpochEnd, // The last version in the old epoch not (to be) rolled back in this recovery
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recoveryTransactionVersion; // The first version in this epoch
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Version liveCommittedVersion; // The largest live committed version reported by commit proxies.
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bool databaseLocked;
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Optional<Value> proxyMetadataVersion;
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Version minKnownCommittedVersion;
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ServerCoordinators coordinators;
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Version version; // The last version assigned to a proxy by getVersion()
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double lastVersionTime;
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std::map<UID, CommitProxyVersionReplies> lastCommitProxyVersionReplies;
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MasterInterface myInterface;
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ResolutionBalancer resolutionBalancer;
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bool forceRecovery;
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CounterCollection cc;
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Counter getCommitVersionRequests;
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Counter getLiveCommittedVersionRequests;
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Counter reportLiveCommittedVersionRequests;
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Future<Void> logger;
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Future<Void> balancer;
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MasterData(Reference<AsyncVar<ServerDBInfo> const> const& dbInfo,
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MasterInterface const& myInterface,
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ServerCoordinators const& coordinators,
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ClusterControllerFullInterface const& clusterController,
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Standalone<StringRef> const& dbId,
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bool forceRecovery)
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: dbgid(myInterface.id()), lastEpochEnd(invalidVersion), recoveryTransactionVersion(invalidVersion),
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liveCommittedVersion(invalidVersion), databaseLocked(false), minKnownCommittedVersion(invalidVersion),
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coordinators(coordinators), version(invalidVersion), lastVersionTime(0), myInterface(myInterface),
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resolutionBalancer(&version), forceRecovery(forceRecovery), cc("Master", dbgid.toString()),
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getCommitVersionRequests("GetCommitVersionRequests", cc),
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getLiveCommittedVersionRequests("GetLiveCommittedVersionRequests", cc),
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reportLiveCommittedVersionRequests("ReportLiveCommittedVersionRequests", cc) {
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logger = traceCounters("MasterMetrics", dbgid, SERVER_KNOBS->WORKER_LOGGING_INTERVAL, &cc, "MasterMetrics");
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if (forceRecovery && !myInterface.locality.dcId().present()) {
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TraceEvent(SevError, "ForcedRecoveryRequiresDcID").log();
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forceRecovery = false;
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}
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balancer = resolutionBalancer.resolutionBalancing();
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}
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~MasterData() = default;
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};
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ACTOR Future<Void> getVersion(Reference<MasterData> self, GetCommitVersionRequest req) {
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state Span span("M:getVersion"_loc, { req.spanContext });
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state std::map<UID, CommitProxyVersionReplies>::iterator proxyItr =
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self->lastCommitProxyVersionReplies.find(req.requestingProxy); // lastCommitProxyVersionReplies never changes
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++self->getCommitVersionRequests;
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if (proxyItr == self->lastCommitProxyVersionReplies.end()) {
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// Request from invalid proxy (e.g. from duplicate recruitment request)
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req.reply.send(Never());
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return Void();
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}
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TEST(proxyItr->second.latestRequestNum.get() < req.requestNum - 1); // Commit version request queued up
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wait(proxyItr->second.latestRequestNum.whenAtLeast(req.requestNum - 1));
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auto itr = proxyItr->second.replies.find(req.requestNum);
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if (itr != proxyItr->second.replies.end()) {
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TEST(true); // Duplicate request for sequence
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req.reply.send(itr->second);
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} else if (req.requestNum <= proxyItr->second.latestRequestNum.get()) {
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TEST(true); // Old request for previously acknowledged sequence - may be impossible with current FlowTransport
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ASSERT(req.requestNum <
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proxyItr->second.latestRequestNum.get()); // The latest request can never be acknowledged
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req.reply.send(Never());
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} else {
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GetCommitVersionReply rep;
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if (self->version == invalidVersion) {
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self->lastVersionTime = now();
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self->version = self->recoveryTransactionVersion;
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rep.prevVersion = self->lastEpochEnd;
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} else {
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double t1 = now();
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if (BUGGIFY) {
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t1 = self->lastVersionTime;
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}
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rep.prevVersion = self->version;
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self->version +=
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std::max<Version>(1,
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std::min<Version>(SERVER_KNOBS->MAX_READ_TRANSACTION_LIFE_VERSIONS,
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SERVER_KNOBS->VERSIONS_PER_SECOND * (t1 - self->lastVersionTime)));
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TEST(self->version - rep.prevVersion == 1); // Minimum possible version gap
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bool maxVersionGap = self->version - rep.prevVersion == SERVER_KNOBS->MAX_READ_TRANSACTION_LIFE_VERSIONS;
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TEST(maxVersionGap); // Maximum possible version gap
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self->lastVersionTime = t1;
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self->resolutionBalancer.setChangesInReply(req.requestingProxy, rep);
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}
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rep.version = self->version;
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rep.requestNum = req.requestNum;
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proxyItr->second.replies.erase(proxyItr->second.replies.begin(),
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proxyItr->second.replies.upper_bound(req.mostRecentProcessedRequestNum));
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proxyItr->second.replies[req.requestNum] = rep;
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ASSERT(rep.prevVersion >= 0);
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req.reply.send(rep);
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ASSERT(proxyItr->second.latestRequestNum.get() == req.requestNum - 1);
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proxyItr->second.latestRequestNum.set(req.requestNum);
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}
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return Void();
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}
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ACTOR Future<Void> provideVersions(Reference<MasterData> self) {
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state ActorCollection versionActors(false);
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loop choose {
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when(GetCommitVersionRequest req = waitNext(self->myInterface.getCommitVersion.getFuture())) {
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versionActors.add(getVersion(self, req));
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}
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when(wait(versionActors.getResult())) {}
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}
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}
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ACTOR Future<Void> serveLiveCommittedVersion(Reference<MasterData> self) {
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loop {
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choose {
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when(GetRawCommittedVersionRequest req = waitNext(self->myInterface.getLiveCommittedVersion.getFuture())) {
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if (req.debugID.present())
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g_traceBatch.addEvent("TransactionDebug",
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req.debugID.get().first(),
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"MasterServer.serveLiveCommittedVersion.GetRawCommittedVersion");
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if (self->liveCommittedVersion == invalidVersion) {
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self->liveCommittedVersion = self->recoveryTransactionVersion;
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}
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++self->getLiveCommittedVersionRequests;
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GetRawCommittedVersionReply reply;
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reply.version = self->liveCommittedVersion;
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reply.locked = self->databaseLocked;
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reply.metadataVersion = self->proxyMetadataVersion;
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reply.minKnownCommittedVersion = self->minKnownCommittedVersion;
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req.reply.send(reply);
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}
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when(ReportRawCommittedVersionRequest req =
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waitNext(self->myInterface.reportLiveCommittedVersion.getFuture())) {
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self->minKnownCommittedVersion = std::max(self->minKnownCommittedVersion, req.minKnownCommittedVersion);
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if (req.version > self->liveCommittedVersion) {
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auto curTime = now();
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// add debug here to change liveCommittedVersion to time bound of now()
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debug_advanceVersionTimestamp(self->liveCommittedVersion,
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curTime + CLIENT_KNOBS->MAX_VERSION_CACHE_LAG);
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// also add req.version but with no time bound
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debug_advanceVersionTimestamp(req.version, std::numeric_limits<double>::max());
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self->liveCommittedVersion = req.version;
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self->databaseLocked = req.locked;
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self->proxyMetadataVersion = req.metadataVersion;
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}
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++self->reportLiveCommittedVersionRequests;
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req.reply.send(Void());
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}
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}
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}
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}
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ACTOR Future<Void> updateRecoveryData(Reference<MasterData> self) {
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loop {
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UpdateRecoveryDataRequest req = waitNext(self->myInterface.updateRecoveryData.getFuture());
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TraceEvent("UpdateRecoveryData", self->dbgid)
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.detail("RecoveryTxnVersion", req.recoveryTransactionVersion)
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.detail("LastEpochEnd", req.lastEpochEnd)
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.detail("NumCommitProxies", req.commitProxies.size());
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if (self->recoveryTransactionVersion == invalidVersion ||
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req.recoveryTransactionVersion > self->recoveryTransactionVersion) {
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self->recoveryTransactionVersion = req.recoveryTransactionVersion;
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}
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if (self->lastEpochEnd == invalidVersion || req.lastEpochEnd > self->lastEpochEnd) {
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self->lastEpochEnd = req.lastEpochEnd;
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}
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if (req.commitProxies.size() > 0) {
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self->lastCommitProxyVersionReplies.clear();
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for (auto& p : req.commitProxies) {
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self->lastCommitProxyVersionReplies[p.id()] = CommitProxyVersionReplies();
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}
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}
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self->resolutionBalancer.setCommitProxies(req.commitProxies);
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self->resolutionBalancer.setResolvers(req.resolvers);
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req.reply.send(Void());
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}
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}
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static std::set<int> const& normalMasterErrors() {
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static std::set<int> s;
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if (s.empty()) {
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s.insert(error_code_tlog_stopped);
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s.insert(error_code_tlog_failed);
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s.insert(error_code_commit_proxy_failed);
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s.insert(error_code_grv_proxy_failed);
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s.insert(error_code_resolver_failed);
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s.insert(error_code_backup_worker_failed);
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s.insert(error_code_recruitment_failed);
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s.insert(error_code_no_more_servers);
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s.insert(error_code_cluster_recovery_failed);
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s.insert(error_code_coordinated_state_conflict);
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s.insert(error_code_master_max_versions_in_flight);
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s.insert(error_code_worker_removed);
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s.insert(error_code_new_coordinators_timed_out);
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s.insert(error_code_broken_promise);
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}
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return s;
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}
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ACTOR Future<Void> masterServer(MasterInterface mi,
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Reference<AsyncVar<ServerDBInfo> const> db,
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Reference<AsyncVar<Optional<ClusterControllerFullInterface>> const> ccInterface,
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ServerCoordinators coordinators,
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LifetimeToken lifetime,
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bool forceRecovery) {
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state Future<Void> ccTimeout = delay(SERVER_KNOBS->CC_INTERFACE_TIMEOUT);
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while (!ccInterface->get().present() || db->get().clusterInterface != ccInterface->get().get()) {
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wait(ccInterface->onChange() || db->onChange() || ccTimeout);
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if (ccTimeout.isReady()) {
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TraceEvent("MasterTerminated", mi.id())
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.detail("Reason", "Timeout")
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.detail("CCInterface", ccInterface->get().present() ? ccInterface->get().get().id() : UID())
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.detail("DBInfoInterface", db->get().clusterInterface.id());
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return Void();
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}
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}
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state Future<Void> onDBChange = Void();
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state PromiseStream<Future<Void>> addActor;
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state Reference<MasterData> self(
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new MasterData(db, mi, coordinators, db->get().clusterInterface, LiteralStringRef(""), forceRecovery));
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state Future<Void> collection = actorCollection(addActor.getFuture());
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addActor.send(traceRole(Role::MASTER, mi.id()));
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addActor.send(provideVersions(self));
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addActor.send(serveLiveCommittedVersion(self));
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addActor.send(updateRecoveryData(self));
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TEST(!lifetime.isStillValid(db->get().masterLifetime, mi.id() == db->get().master.id())); // Master born doomed
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TraceEvent("MasterLifetime", self->dbgid).detail("LifetimeToken", lifetime.toString());
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try {
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loop choose {
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when(wait(onDBChange)) {
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onDBChange = db->onChange();
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if (!lifetime.isStillValid(db->get().masterLifetime, mi.id() == db->get().master.id())) {
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TraceEvent("MasterTerminated", mi.id())
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.detail("Reason", "LifetimeToken")
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.detail("MyToken", lifetime.toString())
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.detail("CurrentToken", db->get().masterLifetime.toString());
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TEST(true); // Master replaced, dying
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if (BUGGIFY)
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wait(delay(5));
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throw worker_removed();
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}
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}
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when(wait(collection)) {
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ASSERT(false);
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throw internal_error();
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}
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}
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} catch (Error& e) {
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state Error err = e;
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if (e.code() != error_code_actor_cancelled) {
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wait(delay(0.0));
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}
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while (!addActor.isEmpty()) {
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addActor.getFuture().pop();
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}
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TEST(err.code() == error_code_tlog_failed); // Master: terminated due to tLog failure
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TEST(err.code() == error_code_commit_proxy_failed); // Master: terminated due to commit proxy failure
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TEST(err.code() == error_code_grv_proxy_failed); // Master: terminated due to GRV proxy failure
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TEST(err.code() == error_code_resolver_failed); // Master: terminated due to resolver failure
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TEST(err.code() == error_code_backup_worker_failed); // Master: terminated due to backup worker failure
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if (normalMasterErrors().count(err.code())) {
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TraceEvent("MasterTerminated", mi.id()).error(err);
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return Void();
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}
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throw err;
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}
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}
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