520 lines
19 KiB
C++
520 lines
19 KiB
C++
/*
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* DDTxnProcessor.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 "fdbserver/DDTxnProcessor.h"
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#include "fdbclient/NativeAPI.actor.h"
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#include "fdbclient/ManagementAPI.actor.h"
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#include "fdbserver/DataDistribution.actor.h"
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#include "fdbclient/DatabaseContext.h"
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#include "flow/actorcompiler.h" // This must be the last #include.
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class DDTxnProcessorImpl {
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friend class DDTxnProcessor;
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// return {sourceServers, completeSources}
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ACTOR static Future<IDDTxnProcessor::SourceServers> getSourceServersForRange(Database cx, KeyRangeRef keys) {
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state std::set<UID> servers;
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state std::vector<UID> completeSources;
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state Transaction tr(cx);
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loop {
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servers.clear();
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completeSources.clear();
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tr.setOption(FDBTransactionOptions::PRIORITY_SYSTEM_IMMEDIATE);
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tr.setOption(FDBTransactionOptions::READ_SYSTEM_KEYS);
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try {
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state RangeResult UIDtoTagMap = wait(tr.getRange(serverTagKeys, CLIENT_KNOBS->TOO_MANY));
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ASSERT(!UIDtoTagMap.more && UIDtoTagMap.size() < CLIENT_KNOBS->TOO_MANY);
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RangeResult keyServersEntries = wait(tr.getRange(lastLessOrEqual(keyServersKey(keys.begin)),
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firstGreaterOrEqual(keyServersKey(keys.end)),
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SERVER_KNOBS->DD_QUEUE_MAX_KEY_SERVERS));
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if (keyServersEntries.size() < SERVER_KNOBS->DD_QUEUE_MAX_KEY_SERVERS) {
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for (int shard = 0; shard < keyServersEntries.size(); shard++) {
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std::vector<UID> src, dest;
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decodeKeyServersValue(UIDtoTagMap, keyServersEntries[shard].value, src, dest);
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ASSERT(src.size());
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for (int i = 0; i < src.size(); i++) {
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servers.insert(src[i]);
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}
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if (shard == 0) {
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completeSources = src;
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} else {
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for (int i = 0; i < completeSources.size(); i++) {
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if (std::find(src.begin(), src.end(), completeSources[i]) == src.end()) {
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swapAndPop(&completeSources, i--);
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}
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}
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}
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}
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ASSERT(servers.size() > 0);
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}
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// If the size of keyServerEntries is large, then just assume we are using all storage servers
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// Why the size can be large?
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// When a shard is inflight and DD crashes, some destination servers may have already got the data.
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// The new DD will treat the destination servers as source servers. So the size can be large.
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else {
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RangeResult serverList = wait(tr.getRange(serverListKeys, CLIENT_KNOBS->TOO_MANY));
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ASSERT(!serverList.more && serverList.size() < CLIENT_KNOBS->TOO_MANY);
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for (auto s = serverList.begin(); s != serverList.end(); ++s)
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servers.insert(decodeServerListValue(s->value).id());
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ASSERT(servers.size() > 0);
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}
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break;
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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return IDDTxnProcessor::SourceServers{ std::vector<UID>(servers.begin(), servers.end()), completeSources };
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}
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// set the system key space
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ACTOR static Future<Void> updateReplicaKeys(Database cx,
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std::vector<Optional<Key>> primaryDcId,
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std::vector<Optional<Key>> remoteDcIds,
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DatabaseConfiguration configuration) {
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state Transaction tr(cx);
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loop {
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try {
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tr.setOption(FDBTransactionOptions::ACCESS_SYSTEM_KEYS);
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tr.setOption(FDBTransactionOptions::PRIORITY_SYSTEM_IMMEDIATE);
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RangeResult replicaKeys = wait(tr.getRange(datacenterReplicasKeys, CLIENT_KNOBS->TOO_MANY));
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for (auto& kv : replicaKeys) {
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auto dcId = decodeDatacenterReplicasKey(kv.key);
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auto replicas = decodeDatacenterReplicasValue(kv.value);
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if ((primaryDcId.size() && primaryDcId.at(0) == dcId) ||
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(remoteDcIds.size() && remoteDcIds.at(0) == dcId && configuration.usableRegions > 1)) {
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if (replicas > configuration.storageTeamSize) {
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tr.set(kv.key, datacenterReplicasValue(configuration.storageTeamSize));
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}
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} else {
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tr.clear(kv.key);
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}
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}
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wait(tr.commit());
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break;
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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return Void();
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}
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// Read keyservers, return unique set of teams
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ACTOR static Future<Reference<InitialDataDistribution>> getInitialDataDistribution(
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Database cx,
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UID distributorId,
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MoveKeysLock moveKeysLock,
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std::vector<Optional<Key>> remoteDcIds,
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const DDEnabledState* ddEnabledState) {
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state Reference<InitialDataDistribution> result = makeReference<InitialDataDistribution>();
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state Key beginKey = allKeys.begin;
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state bool succeeded;
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state Transaction tr(cx);
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state std::map<UID, Optional<Key>> server_dc;
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state std::map<std::vector<UID>, std::pair<std::vector<UID>, std::vector<UID>>> team_cache;
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state std::vector<std::pair<StorageServerInterface, ProcessClass>> tss_servers;
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state int numDataMoves = 0;
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// Get the server list in its own try/catch block since it modifies result. We don't want a subsequent failure
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// causing entries to be duplicated
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loop {
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numDataMoves = 0;
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server_dc.clear();
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result->allServers.clear();
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tss_servers.clear();
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team_cache.clear();
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succeeded = false;
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try {
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// Read healthyZone value which is later used to determine on/off of failure triggered DD
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tr.setOption(FDBTransactionOptions::READ_SYSTEM_KEYS);
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tr.setOption(FDBTransactionOptions::READ_LOCK_AWARE);
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Optional<Value> val = wait(tr.get(healthyZoneKey));
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if (val.present()) {
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auto p = decodeHealthyZoneValue(val.get());
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if (p.second > tr.getReadVersion().get() || p.first == ignoreSSFailuresZoneString) {
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result->initHealthyZoneValue = Optional<Key>(p.first);
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} else {
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result->initHealthyZoneValue = Optional<Key>();
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}
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} else {
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result->initHealthyZoneValue = Optional<Key>();
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}
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result->mode = 1;
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tr.setOption(FDBTransactionOptions::PRIORITY_SYSTEM_IMMEDIATE);
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Optional<Value> mode = wait(tr.get(dataDistributionModeKey));
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if (mode.present()) {
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BinaryReader rd(mode.get(), Unversioned());
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rd >> result->mode;
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}
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if (!result->mode || !ddEnabledState->isDDEnabled()) {
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// DD can be disabled persistently (result->mode = 0) or transiently (isDDEnabled() = 0)
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TraceEvent(SevDebug, "GetInitialDataDistribution_DisabledDD").log();
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return result;
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}
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state Future<std::vector<ProcessData>> workers = getWorkers(&tr);
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state Future<RangeResult> serverList = tr.getRange(serverListKeys, CLIENT_KNOBS->TOO_MANY);
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wait(success(workers) && success(serverList));
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ASSERT(!serverList.get().more && serverList.get().size() < CLIENT_KNOBS->TOO_MANY);
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std::map<Optional<Standalone<StringRef>>, ProcessData> id_data;
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for (int i = 0; i < workers.get().size(); i++)
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id_data[workers.get()[i].locality.processId()] = workers.get()[i];
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for (int i = 0; i < serverList.get().size(); i++) {
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auto ssi = decodeServerListValue(serverList.get()[i].value);
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if (!ssi.isTss()) {
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result->allServers.emplace_back(ssi, id_data[ssi.locality.processId()].processClass);
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server_dc[ssi.id()] = ssi.locality.dcId();
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} else {
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tss_servers.emplace_back(ssi, id_data[ssi.locality.processId()].processClass);
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}
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}
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RangeResult dms = wait(tr.getRange(dataMoveKeys, CLIENT_KNOBS->TOO_MANY));
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ASSERT(!dms.more && dms.size() < CLIENT_KNOBS->TOO_MANY);
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for (int i = 0; i < dms.size(); ++i) {
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auto dataMove = std::make_shared<DataMove>(decodeDataMoveValue(dms[i].value), true);
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const DataMoveMetaData& meta = dataMove->meta;
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for (const UID& id : meta.src) {
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auto& dc = server_dc[id];
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if (std::find(remoteDcIds.begin(), remoteDcIds.end(), dc) != remoteDcIds.end()) {
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dataMove->remoteSrc.push_back(id);
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} else {
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dataMove->primarySrc.push_back(id);
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}
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}
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for (const UID& id : meta.dest) {
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auto& dc = server_dc[id];
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if (std::find(remoteDcIds.begin(), remoteDcIds.end(), dc) != remoteDcIds.end()) {
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dataMove->remoteDest.push_back(id);
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} else {
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dataMove->primaryDest.push_back(id);
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}
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}
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std::sort(dataMove->primarySrc.begin(), dataMove->primarySrc.end());
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std::sort(dataMove->remoteSrc.begin(), dataMove->remoteSrc.end());
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std::sort(dataMove->primaryDest.begin(), dataMove->primaryDest.end());
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std::sort(dataMove->remoteDest.begin(), dataMove->remoteDest.end());
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auto ranges = result->dataMoveMap.intersectingRanges(meta.range);
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for (auto& r : ranges) {
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ASSERT(!r.value()->valid);
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}
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result->dataMoveMap.insert(meta.range, std::move(dataMove));
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++numDataMoves;
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}
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succeeded = true;
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break;
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} catch (Error& e) {
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wait(tr.onError(e));
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ASSERT(!succeeded); // We shouldn't be retrying if we have already started modifying result in this loop
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TraceEvent("GetInitialTeamsRetry", distributorId).log();
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}
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}
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// If keyServers is too large to read in a single transaction, then we will have to break this process up into
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// multiple transactions. In that case, each iteration should begin where the previous left off
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while (beginKey < allKeys.end) {
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CODE_PROBE(beginKey > allKeys.begin, "Multi-transactional getInitialDataDistribution");
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loop {
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succeeded = false;
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try {
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tr.setOption(FDBTransactionOptions::PRIORITY_SYSTEM_IMMEDIATE);
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wait(checkMoveKeysLockReadOnly(&tr, moveKeysLock, ddEnabledState));
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state RangeResult UIDtoTagMap = wait(tr.getRange(serverTagKeys, CLIENT_KNOBS->TOO_MANY));
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ASSERT(!UIDtoTagMap.more && UIDtoTagMap.size() < CLIENT_KNOBS->TOO_MANY);
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RangeResult keyServers = wait(krmGetRanges(&tr,
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keyServersPrefix,
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KeyRangeRef(beginKey, allKeys.end),
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SERVER_KNOBS->MOVE_KEYS_KRM_LIMIT,
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SERVER_KNOBS->MOVE_KEYS_KRM_LIMIT_BYTES));
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succeeded = true;
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std::vector<UID> src, dest, last;
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UID srcId, destId;
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// for each range
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for (int i = 0; i < keyServers.size() - 1; i++) {
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decodeKeyServersValue(UIDtoTagMap, keyServers[i].value, src, dest, srcId, destId);
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DDShardInfo info(keyServers[i].key, srcId, destId);
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if (remoteDcIds.size()) {
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auto srcIter = team_cache.find(src);
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if (srcIter == team_cache.end()) {
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for (auto& id : src) {
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auto& dc = server_dc[id];
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if (std::find(remoteDcIds.begin(), remoteDcIds.end(), dc) != remoteDcIds.end()) {
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info.remoteSrc.push_back(id);
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} else {
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info.primarySrc.push_back(id);
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}
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}
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result->primaryTeams.insert(info.primarySrc);
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result->remoteTeams.insert(info.remoteSrc);
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team_cache[src] = std::make_pair(info.primarySrc, info.remoteSrc);
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} else {
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info.primarySrc = srcIter->second.first;
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info.remoteSrc = srcIter->second.second;
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}
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if (dest.size()) {
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info.hasDest = true;
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auto destIter = team_cache.find(dest);
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if (destIter == team_cache.end()) {
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for (auto& id : dest) {
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auto& dc = server_dc[id];
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if (std::find(remoteDcIds.begin(), remoteDcIds.end(), dc) !=
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remoteDcIds.end()) {
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info.remoteDest.push_back(id);
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} else {
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info.primaryDest.push_back(id);
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}
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}
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result->primaryTeams.insert(info.primaryDest);
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result->remoteTeams.insert(info.remoteDest);
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team_cache[dest] = std::make_pair(info.primaryDest, info.remoteDest);
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} else {
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info.primaryDest = destIter->second.first;
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info.remoteDest = destIter->second.second;
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}
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}
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} else {
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info.primarySrc = src;
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auto srcIter = team_cache.find(src);
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if (srcIter == team_cache.end()) {
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result->primaryTeams.insert(src);
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team_cache[src] = std::pair<std::vector<UID>, std::vector<UID>>();
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}
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if (dest.size()) {
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info.hasDest = true;
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info.primaryDest = dest;
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auto destIter = team_cache.find(dest);
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if (destIter == team_cache.end()) {
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result->primaryTeams.insert(dest);
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team_cache[dest] = std::pair<std::vector<UID>, std::vector<UID>>();
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}
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}
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}
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result->shards.push_back(info);
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}
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ASSERT_GT(keyServers.size(), 0);
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beginKey = keyServers.end()[-1].key;
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break;
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} catch (Error& e) {
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TraceEvent("GetInitialTeamsKeyServersRetry", distributorId).error(e);
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wait(tr.onError(e));
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ASSERT(!succeeded); // We shouldn't be retrying if we have already started modifying result in this
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// loop
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}
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}
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tr.reset();
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}
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// a dummy shard at the end with no keys or servers makes life easier for trackInitialShards()
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result->shards.push_back(DDShardInfo(allKeys.end));
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if (SERVER_KNOBS->SHARD_ENCODE_LOCATION_METADATA && numDataMoves > 0) {
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for (int shard = 0; shard < result->shards.size() - 1; ++shard) {
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const DDShardInfo& iShard = result->shards[shard];
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KeyRangeRef keys = KeyRangeRef(iShard.key, result->shards[shard + 1].key);
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result->dataMoveMap[keys.begin]->validateShard(iShard, keys);
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}
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}
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// add tss to server list AFTER teams are built
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for (auto& it : tss_servers) {
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result->allServers.push_back(it);
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}
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return result;
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}
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ACTOR static Future<Void> waitForDataDistributionEnabled(Database cx, const DDEnabledState* ddEnabledState) {
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state Transaction tr(cx);
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loop {
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wait(delay(SERVER_KNOBS->DD_ENABLED_CHECK_DELAY, TaskPriority::DataDistribution));
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try {
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Optional<Value> mode = wait(tr.get(dataDistributionModeKey));
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if (!mode.present() && ddEnabledState->isDDEnabled()) {
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TraceEvent("WaitForDDEnabledSucceeded").log();
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return Void();
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}
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if (mode.present()) {
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BinaryReader rd(mode.get(), Unversioned());
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int m;
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rd >> m;
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TraceEvent(SevDebug, "WaitForDDEnabled")
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.detail("Mode", m)
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.detail("IsDDEnabled", ddEnabledState->isDDEnabled());
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if (m && ddEnabledState->isDDEnabled()) {
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TraceEvent("WaitForDDEnabledSucceeded").log();
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return Void();
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}
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}
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tr.reset();
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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}
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ACTOR static Future<bool> isDataDistributionEnabled(Database cx, const DDEnabledState* ddEnabledState) {
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state Transaction tr(cx);
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loop {
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try {
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Optional<Value> mode = wait(tr.get(dataDistributionModeKey));
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if (!mode.present() && ddEnabledState->isDDEnabled())
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return true;
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if (mode.present()) {
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BinaryReader rd(mode.get(), Unversioned());
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int m;
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rd >> m;
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if (m && ddEnabledState->isDDEnabled()) {
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TraceEvent(SevDebug, "IsDDEnabledSucceeded")
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.detail("Mode", m)
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.detail("IsDDEnabled", ddEnabledState->isDDEnabled());
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return true;
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}
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}
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// SOMEDAY: Write a wrapper in MoveKeys.actor.h
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Optional<Value> readVal = wait(tr.get(moveKeysLockOwnerKey));
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UID currentOwner =
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readVal.present() ? BinaryReader::fromStringRef<UID>(readVal.get(), Unversioned()) : UID();
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if (ddEnabledState->isDDEnabled() && (currentOwner != dataDistributionModeLock)) {
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TraceEvent(SevDebug, "IsDDEnabledSucceeded")
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.detail("CurrentOwner", currentOwner)
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.detail("DDModeLock", dataDistributionModeLock)
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.detail("IsDDEnabled", ddEnabledState->isDDEnabled());
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return true;
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}
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TraceEvent(SevDebug, "IsDDEnabledFailed")
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.detail("CurrentOwner", currentOwner)
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.detail("DDModeLock", dataDistributionModeLock)
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.detail("IsDDEnabled", ddEnabledState->isDDEnabled());
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return false;
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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}
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ACTOR static Future<Void> pollMoveKeysLock(Database cx, MoveKeysLock lock, const DDEnabledState* ddEnabledState) {
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loop {
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wait(delay(SERVER_KNOBS->MOVEKEYS_LOCK_POLLING_DELAY));
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state Transaction tr(cx);
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loop {
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try {
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wait(checkMoveKeysLockReadOnly(&tr, lock, ddEnabledState));
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break;
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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}
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}
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ACTOR static Future<Optional<Value>> readRebalanceDDIgnoreKey(Database cx) {
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state Transaction tr(cx);
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loop {
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try {
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tr.setOption(FDBTransactionOptions::LOCK_AWARE);
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tr.setOption(FDBTransactionOptions::READ_SYSTEM_KEYS);
|
|
Optional<Value> res = wait(tr.get(rebalanceDDIgnoreKey));
|
|
return res;
|
|
} catch (Error& e) {
|
|
wait(tr.onError(e));
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
Future<IDDTxnProcessor::SourceServers> DDTxnProcessor::getSourceServersForRange(const KeyRangeRef range) {
|
|
return DDTxnProcessorImpl::getSourceServersForRange(cx, range);
|
|
}
|
|
|
|
Future<std::vector<std::pair<StorageServerInterface, ProcessClass>>> DDTxnProcessor::getServerListAndProcessClasses() {
|
|
Transaction tr(cx);
|
|
return NativeAPI::getServerListAndProcessClasses(&tr);
|
|
}
|
|
|
|
Future<MoveKeysLock> DDTxnProcessor::takeMoveKeysLock(const UID& ddId) const {
|
|
return ::takeMoveKeysLock(cx, ddId);
|
|
}
|
|
|
|
Future<DatabaseConfiguration> DDTxnProcessor::getDatabaseConfiguration() const {
|
|
return ::getDatabaseConfiguration(cx);
|
|
}
|
|
|
|
Future<Void> DDTxnProcessor::updateReplicaKeys(const std::vector<Optional<Key>>& primaryIds,
|
|
const std::vector<Optional<Key>>& remoteIds,
|
|
const DatabaseConfiguration& configuration) const {
|
|
return DDTxnProcessorImpl::updateReplicaKeys(cx, primaryIds, remoteIds, configuration);
|
|
}
|
|
|
|
Future<Reference<InitialDataDistribution>> DDTxnProcessor::getInitialDataDistribution(
|
|
const UID& distributorId,
|
|
const MoveKeysLock& moveKeysLock,
|
|
const std::vector<Optional<Key>>& remoteDcIds,
|
|
const DDEnabledState* ddEnabledState) {
|
|
return DDTxnProcessorImpl::getInitialDataDistribution(cx, distributorId, moveKeysLock, remoteDcIds, ddEnabledState);
|
|
}
|
|
|
|
Future<Void> DDTxnProcessor::waitForDataDistributionEnabled(const DDEnabledState* ddEnabledState) const {
|
|
return DDTxnProcessorImpl::waitForDataDistributionEnabled(cx, ddEnabledState);
|
|
}
|
|
|
|
Future<bool> DDTxnProcessor::isDataDistributionEnabled(const DDEnabledState* ddEnabledState) const {
|
|
return DDTxnProcessorImpl::isDataDistributionEnabled(cx, ddEnabledState);
|
|
}
|
|
|
|
Future<Void> DDTxnProcessor::pollMoveKeysLock(const MoveKeysLock& lock, const DDEnabledState* ddEnabledState) const {
|
|
return DDTxnProcessorImpl::pollMoveKeysLock(cx, lock, ddEnabledState);
|
|
}
|
|
|
|
Future<HealthMetrics> DDTxnProcessor::getHealthMetrics(bool detailed) const {
|
|
return cx->getHealthMetrics(detailed);
|
|
}
|
|
|
|
Future<Optional<Value>> DDTxnProcessor::readRebalanceDDIgnoreKey() const {
|
|
return DDTxnProcessorImpl::readRebalanceDDIgnoreKey(cx);
|
|
}
|