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foundationdb/fdbserver/DDTxnProcessor.actor.cpp

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/*
* DDTxnProcessor.actor.cpp
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "fdbserver/DDTxnProcessor.h"
#include "fdbclient/NativeAPI.actor.h"
#include "fdbclient/ManagementAPI.actor.h"
#include "fdbserver/DataDistribution.actor.h"
#include "flow/actorcompiler.h" // This must be the last #include.
class DDTxnProcessorImpl {
friend class DDTxnProcessor;
// return {sourceServers, completeSources}
ACTOR static Future<IDDTxnProcessor::SourceServers> getSourceServersForRange(Database cx, KeyRangeRef keys) {
state std::set<UID> servers;
state std::vector<UID> completeSources;
state Transaction tr(cx);
loop {
servers.clear();
completeSources.clear();
tr.setOption(FDBTransactionOptions::PRIORITY_SYSTEM_IMMEDIATE);
tr.setOption(FDBTransactionOptions::READ_SYSTEM_KEYS);
try {
state RangeResult UIDtoTagMap = wait(tr.getRange(serverTagKeys, CLIENT_KNOBS->TOO_MANY));
ASSERT(!UIDtoTagMap.more && UIDtoTagMap.size() < CLIENT_KNOBS->TOO_MANY);
RangeResult keyServersEntries = wait(tr.getRange(lastLessOrEqual(keyServersKey(keys.begin)),
firstGreaterOrEqual(keyServersKey(keys.end)),
SERVER_KNOBS->DD_QUEUE_MAX_KEY_SERVERS));
if (keyServersEntries.size() < SERVER_KNOBS->DD_QUEUE_MAX_KEY_SERVERS) {
for (int shard = 0; shard < keyServersEntries.size(); shard++) {
std::vector<UID> src, dest;
decodeKeyServersValue(UIDtoTagMap, keyServersEntries[shard].value, src, dest);
ASSERT(src.size());
for (int i = 0; i < src.size(); i++) {
servers.insert(src[i]);
}
if (shard == 0) {
completeSources = src;
} else {
for (int i = 0; i < completeSources.size(); i++) {
if (std::find(src.begin(), src.end(), completeSources[i]) == src.end()) {
swapAndPop(&completeSources, i--);
}
}
}
}
ASSERT(servers.size() > 0);
}
// If the size of keyServerEntries is large, then just assume we are using all storage servers
// Why the size can be large?
// When a shard is inflight and DD crashes, some destination servers may have already got the data.
// The new DD will treat the destination servers as source servers. So the size can be large.
else {
RangeResult serverList = wait(tr.getRange(serverListKeys, CLIENT_KNOBS->TOO_MANY));
ASSERT(!serverList.more && serverList.size() < CLIENT_KNOBS->TOO_MANY);
for (auto s = serverList.begin(); s != serverList.end(); ++s)
servers.insert(decodeServerListValue(s->value).id());
ASSERT(servers.size() > 0);
}
break;
} catch (Error& e) {
wait(tr.onError(e));
}
}
return IDDTxnProcessor::SourceServers{ std::vector<UID>(servers.begin(), servers.end()), completeSources };
}
// set the system key space
ACTOR static Future<Void> updateReplicaKeys(Database cx,
std::vector<Optional<Key>> primaryDcId,
std::vector<Optional<Key>> remoteDcIds,
DatabaseConfiguration configuration) {
state Transaction tr(cx);
loop {
try {
tr.setOption(FDBTransactionOptions::ACCESS_SYSTEM_KEYS);
tr.setOption(FDBTransactionOptions::PRIORITY_SYSTEM_IMMEDIATE);
RangeResult replicaKeys = wait(tr.getRange(datacenterReplicasKeys, CLIENT_KNOBS->TOO_MANY));
for (auto& kv : replicaKeys) {
auto dcId = decodeDatacenterReplicasKey(kv.key);
auto replicas = decodeDatacenterReplicasValue(kv.value);
if ((primaryDcId.size() && primaryDcId.at(0) == dcId) ||
(remoteDcIds.size() && remoteDcIds.at(0) == dcId && configuration.usableRegions > 1)) {
if (replicas > configuration.storageTeamSize) {
tr.set(kv.key, datacenterReplicasValue(configuration.storageTeamSize));
}
} else {
tr.clear(kv.key);
}
}
wait(tr.commit());
break;
} catch (Error& e) {
wait(tr.onError(e));
}
}
return Void();
}
// Read keyservers, return unique set of teams
ACTOR static Future<Reference<InitialDataDistribution>> getInitialDataDistribution(
Database cx,
UID distributorId,
MoveKeysLock moveKeysLock,
std::vector<Optional<Key>> remoteDcIds,
const DDEnabledState* ddEnabledState) {
state Reference<InitialDataDistribution> result = makeReference<InitialDataDistribution>();
state Key beginKey = allKeys.begin;
state bool succeeded;
state Transaction tr(cx);
state std::map<UID, Optional<Key>> server_dc;
state std::map<std::vector<UID>, std::pair<std::vector<UID>, std::vector<UID>>> team_cache;
state std::vector<std::pair<StorageServerInterface, ProcessClass>> tss_servers;
state int numDataMoves = 0;
// Get the server list in its own try/catch block since it modifies result. We don't want a subsequent failure
// causing entries to be duplicated
loop {
numDataMoves = 0;
server_dc.clear();
result->allServers.clear();
tss_servers.clear();
team_cache.clear();
succeeded = false;
try {
// Read healthyZone value which is later used to determine on/off of failure triggered DD
tr.setOption(FDBTransactionOptions::READ_SYSTEM_KEYS);
tr.setOption(FDBTransactionOptions::READ_LOCK_AWARE);
Optional<Value> val = wait(tr.get(healthyZoneKey));
if (val.present()) {
auto p = decodeHealthyZoneValue(val.get());
if (p.second > tr.getReadVersion().get() || p.first == ignoreSSFailuresZoneString) {
result->initHealthyZoneValue = Optional<Key>(p.first);
} else {
result->initHealthyZoneValue = Optional<Key>();
}
} else {
result->initHealthyZoneValue = Optional<Key>();
}
result->mode = 1;
tr.setOption(FDBTransactionOptions::PRIORITY_SYSTEM_IMMEDIATE);
Optional<Value> mode = wait(tr.get(dataDistributionModeKey));
if (mode.present()) {
BinaryReader rd(mode.get(), Unversioned());
rd >> result->mode;
}
if (!result->mode || !ddEnabledState->isDDEnabled()) {
// DD can be disabled persistently (result->mode = 0) or transiently (isDDEnabled() = 0)
TraceEvent(SevDebug, "GetInitialDataDistribution_DisabledDD").log();
return result;
}
state Future<std::vector<ProcessData>> workers = getWorkers(&tr);
state Future<RangeResult> serverList = tr.getRange(serverListKeys, CLIENT_KNOBS->TOO_MANY);
wait(success(workers) && success(serverList));
ASSERT(!serverList.get().more && serverList.get().size() < CLIENT_KNOBS->TOO_MANY);
std::map<Optional<Standalone<StringRef>>, ProcessData> id_data;
for (int i = 0; i < workers.get().size(); i++)
id_data[workers.get()[i].locality.processId()] = workers.get()[i];
for (int i = 0; i < serverList.get().size(); i++) {
auto ssi = decodeServerListValue(serverList.get()[i].value);
if (!ssi.isTss()) {
result->allServers.emplace_back(ssi, id_data[ssi.locality.processId()].processClass);
server_dc[ssi.id()] = ssi.locality.dcId();
} else {
tss_servers.emplace_back(ssi, id_data[ssi.locality.processId()].processClass);
}
}
RangeResult dms = wait(tr.getRange(dataMoveKeys, CLIENT_KNOBS->TOO_MANY));
ASSERT(!dms.more && dms.size() < CLIENT_KNOBS->TOO_MANY);
for (int i = 0; i < dms.size(); ++i) {
auto dataMove = std::make_shared<DataMove>(decodeDataMoveValue(dms[i].value), true);
const DataMoveMetaData& meta = dataMove->meta;
for (const UID& id : meta.src) {
auto& dc = server_dc[id];
if (std::find(remoteDcIds.begin(), remoteDcIds.end(), dc) != remoteDcIds.end()) {
dataMove->remoteSrc.push_back(id);
} else {
dataMove->primarySrc.push_back(id);
}
}
for (const UID& id : meta.dest) {
auto& dc = server_dc[id];
if (std::find(remoteDcIds.begin(), remoteDcIds.end(), dc) != remoteDcIds.end()) {
dataMove->remoteDest.push_back(id);
} else {
dataMove->primaryDest.push_back(id);
}
}
std::sort(dataMove->primarySrc.begin(), dataMove->primarySrc.end());
std::sort(dataMove->remoteSrc.begin(), dataMove->remoteSrc.end());
std::sort(dataMove->primaryDest.begin(), dataMove->primaryDest.end());
std::sort(dataMove->remoteDest.begin(), dataMove->remoteDest.end());
auto ranges = result->dataMoveMap.intersectingRanges(meta.range);
for (auto& r : ranges) {
ASSERT(!r.value()->valid);
}
result->dataMoveMap.insert(meta.range, std::move(dataMove));
++numDataMoves;
}
succeeded = true;
break;
} catch (Error& e) {
wait(tr.onError(e));
ASSERT(!succeeded); // We shouldn't be retrying if we have already started modifying result in this loop
TraceEvent("GetInitialTeamsRetry", distributorId).log();
}
}
// If keyServers is too large to read in a single transaction, then we will have to break this process up into
// multiple transactions. In that case, each iteration should begin where the previous left off
while (beginKey < allKeys.end) {
CODE_PROBE(beginKey > allKeys.begin, "Multi-transactional getInitialDataDistribution");
loop {
succeeded = false;
try {
tr.setOption(FDBTransactionOptions::PRIORITY_SYSTEM_IMMEDIATE);
wait(checkMoveKeysLockReadOnly(&tr, moveKeysLock, ddEnabledState));
state RangeResult UIDtoTagMap = wait(tr.getRange(serverTagKeys, CLIENT_KNOBS->TOO_MANY));
ASSERT(!UIDtoTagMap.more && UIDtoTagMap.size() < CLIENT_KNOBS->TOO_MANY);
RangeResult keyServers = wait(krmGetRanges(&tr,
keyServersPrefix,
KeyRangeRef(beginKey, allKeys.end),
SERVER_KNOBS->MOVE_KEYS_KRM_LIMIT,
SERVER_KNOBS->MOVE_KEYS_KRM_LIMIT_BYTES));
succeeded = true;
std::vector<UID> src, dest, last;
UID srcId, destId;
// for each range
for (int i = 0; i < keyServers.size() - 1; i++) {
decodeKeyServersValue(UIDtoTagMap, keyServers[i].value, src, dest, srcId, destId);
DDShardInfo info(keyServers[i].key, srcId, destId);
if (remoteDcIds.size()) {
auto srcIter = team_cache.find(src);
if (srcIter == team_cache.end()) {
for (auto& id : src) {
auto& dc = server_dc[id];
if (std::find(remoteDcIds.begin(), remoteDcIds.end(), dc) != remoteDcIds.end()) {
info.remoteSrc.push_back(id);
} else {
info.primarySrc.push_back(id);
}
}
result->primaryTeams.insert(info.primarySrc);
result->remoteTeams.insert(info.remoteSrc);
team_cache[src] = std::make_pair(info.primarySrc, info.remoteSrc);
} else {
info.primarySrc = srcIter->second.first;
info.remoteSrc = srcIter->second.second;
}
if (dest.size()) {
info.hasDest = true;
auto destIter = team_cache.find(dest);
if (destIter == team_cache.end()) {
for (auto& id : dest) {
auto& dc = server_dc[id];
if (std::find(remoteDcIds.begin(), remoteDcIds.end(), dc) !=
remoteDcIds.end()) {
info.remoteDest.push_back(id);
} else {
info.primaryDest.push_back(id);
}
}
result->primaryTeams.insert(info.primaryDest);
result->remoteTeams.insert(info.remoteDest);
team_cache[dest] = std::make_pair(info.primaryDest, info.remoteDest);
} else {
info.primaryDest = destIter->second.first;
info.remoteDest = destIter->second.second;
}
}
} else {
info.primarySrc = src;
auto srcIter = team_cache.find(src);
if (srcIter == team_cache.end()) {
result->primaryTeams.insert(src);
team_cache[src] = std::pair<std::vector<UID>, std::vector<UID>>();
}
if (dest.size()) {
info.hasDest = true;
info.primaryDest = dest;
auto destIter = team_cache.find(dest);
if (destIter == team_cache.end()) {
result->primaryTeams.insert(dest);
team_cache[dest] = std::pair<std::vector<UID>, std::vector<UID>>();
}
}
}
result->shards.push_back(info);
}
ASSERT_GT(keyServers.size(), 0);
beginKey = keyServers.end()[-1].key;
break;
} catch (Error& e) {
TraceEvent("GetInitialTeamsKeyServersRetry", distributorId).error(e);
wait(tr.onError(e));
ASSERT(!succeeded); // We shouldn't be retrying if we have already started modifying result in this
// loop
}
}
tr.reset();
}
// a dummy shard at the end with no keys or servers makes life easier for trackInitialShards()
result->shards.push_back(DDShardInfo(allKeys.end));
if (CLIENT_KNOBS->SHARD_ENCODE_LOCATION_METADATA && numDataMoves > 0) {
for (int shard = 0; shard < result->shards.size() - 1; ++shard) {
const DDShardInfo& iShard = result->shards[shard];
KeyRangeRef keys = KeyRangeRef(iShard.key, result->shards[shard + 1].key);
result->dataMoveMap[keys.begin]->validateShard(iShard, keys);
}
}
// add tss to server list AFTER teams are built
for (auto& it : tss_servers) {
result->allServers.push_back(it);
}
return result;
}
ACTOR static Future<Void> waitForDataDistributionEnabled(Database cx, const DDEnabledState* ddEnabledState) {
state Transaction tr(cx);
loop {
wait(delay(SERVER_KNOBS->DD_ENABLED_CHECK_DELAY, TaskPriority::DataDistribution));
try {
Optional<Value> mode = wait(tr.get(dataDistributionModeKey));
if (!mode.present() && ddEnabledState->isDDEnabled()) {
TraceEvent("WaitForDDEnabledSucceeded").log();
return Void();
}
if (mode.present()) {
BinaryReader rd(mode.get(), Unversioned());
int m;
rd >> m;
TraceEvent(SevDebug, "WaitForDDEnabled")
.detail("Mode", m)
.detail("IsDDEnabled", ddEnabledState->isDDEnabled());
if (m && ddEnabledState->isDDEnabled()) {
TraceEvent("WaitForDDEnabledSucceeded").log();
return Void();
}
}
tr.reset();
} 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(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);
}
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