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foundationdb/fdbserver/ApplyMetadataMutation.h

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/*
* ApplyMetadataMutation.h
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 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.
*/
#ifndef FDBSERVER_APPLYMETADATAMUTATION_H
#define FDBSERVER_APPLYMETADATAMUTATION_H
#pragma once
#include "fdbclient/MutationList.h"
#include "fdbclient/SystemData.h"
#include "fdbclient/BackupAgent.actor.h"
#include "fdbclient/Notified.h"
#include "fdbserver/IKeyValueStore.h"
#include "fdbserver/LogSystem.h"
#include "fdbserver/LogProtocolMessage.h"
static bool isMetadataMutation(MutationRef const& m) {
// FIXME: This is conservative - not everything in system keyspace is necessarily processed by applyMetadataMutations
return (m.type == MutationRef::SetValue && m.param1.size() && m.param1[0] == systemKeys.begin[0] && !m.param1.startsWith(nonMetadataSystemKeys.begin)) ||
(m.type == MutationRef::ClearRange && m.param2.size() && m.param2[0] == systemKeys.begin[0] && !nonMetadataSystemKeys.contains(KeyRangeRef(m.param1, m.param2)) );
}
struct applyMutationsData {
Future<Void> worker;
Version endVersion;
Reference<KeyRangeMap<Version>> keyVersion;
};
static Reference<StorageInfo> getStorageInfo(UID id, std::map<UID, Reference<StorageInfo>>* storageCache, IKeyValueStore* txnStateStore) {
Reference<StorageInfo> storageInfo;
auto cacheItr = storageCache->find(id);
if(cacheItr == storageCache->end()) {
storageInfo = Reference<StorageInfo>( new StorageInfo() );
storageInfo->tag = decodeServerTagValue( txnStateStore->readValue( serverTagKeyFor(id) ).get().get() );
storageInfo->interf = decodeServerListValue( txnStateStore->readValue( serverListKeyFor(id) ).get().get() );
(*storageCache)[id] = storageInfo;
} else {
storageInfo = cacheItr->second;
}
return storageInfo;
}
// It is incredibly important that any modifications to txnStateStore are done in such a way that
// the same operations will be done on all proxies at the same time. Otherwise, the data stored in
// txnStateStore will become corrupted.
static void applyMetadataMutations(UID const& dbgid, Arena &arena, VectorRef<MutationRef> const& mutations, IKeyValueStore* txnStateStore, LogPushData* toCommit, bool *confChange, Reference<ILogSystem> logSystem = Reference<ILogSystem>(), Version popVersion = 0,
KeyRangeMap<std::set<Key> >* vecBackupKeys = NULL, KeyRangeMap<ServerCacheInfo>* keyInfo = NULL, std::map<Key, applyMutationsData>* uid_applyMutationsData = NULL, RequestStream<CommitTransactionRequest> commit = RequestStream<CommitTransactionRequest>(),
Database cx = Database(), NotifiedVersion* commitVersion = NULL, std::map<UID, Reference<StorageInfo>>* storageCache = NULL, std::map<Tag, Version>* tag_popped = NULL, bool initialCommit = false ) {
for (auto const& m : mutations) {
//TraceEvent("MetadataMutation", dbgid).detail("M", m.toString());
if (m.param1.size() && m.param1[0] == systemKeys.begin[0] && m.type == MutationRef::SetValue) {
if(m.param1.startsWith(keyServersPrefix)) {
if(keyInfo) {
KeyRef k = m.param1.removePrefix(keyServersPrefix);
if(k != allKeys.end) {
KeyRef end = keyInfo->rangeContaining(k).end();
KeyRangeRef insertRange(k,end);
vector<UID> src, dest;
decodeKeyServersValue(m.param2, src, dest);
ASSERT(storageCache);
ServerCacheInfo info;
info.tags.reserve(src.size() + dest.size());
info.src_info.reserve(src.size());
info.dest_info.reserve(dest.size());
for (const auto& id : src) {
auto storageInfo = getStorageInfo(id, storageCache, txnStateStore);
ASSERT(storageInfo->tag != invalidTag);
info.tags.push_back( storageInfo->tag );
info.src_info.push_back( storageInfo );
}
for (const auto& id : dest) {
auto storageInfo = getStorageInfo(id, storageCache, txnStateStore);
ASSERT(storageInfo->tag != invalidTag);
info.tags.push_back( storageInfo->tag );
info.dest_info.push_back( storageInfo );
}
uniquify(info.tags);
keyInfo->insert(insertRange,info);
}
}
if(!initialCommit) txnStateStore->set(KeyValueRef(m.param1, m.param2));
} else if (m.param1.startsWith(serverKeysPrefix)) {
if(toCommit) {
MutationRef privatized = m;
privatized.param1 = m.param1.withPrefix(systemKeys.begin, arena);
TraceEvent(SevDebug, "SendingPrivateMutation", dbgid).detail("Original", m.toString()).detail("Privatized", privatized.toString()).detail("Server", serverKeysDecodeServer(m.param1))
.detail("TagKey", serverTagKeyFor( serverKeysDecodeServer(m.param1) )).detail("Tag", decodeServerTagValue( txnStateStore->readValue( serverTagKeyFor( serverKeysDecodeServer(m.param1) ) ).get().get() ).toString());
toCommit->addTag( decodeServerTagValue( txnStateStore->readValue( serverTagKeyFor( serverKeysDecodeServer(m.param1) ) ).get().get() ) );
toCommit->addTypedMessage(privatized);
}
} else if (m.param1.startsWith(serverTagPrefix)) {
UID id = decodeServerTagKey(m.param1);
Tag tag = decodeServerTagValue(m.param2);
if(toCommit) {
MutationRef privatized = m;
privatized.param1 = m.param1.withPrefix(systemKeys.begin, arena);
TraceEvent("ServerTag", dbgid).detail("Server", id).detail("Tag", tag.toString());
toCommit->addTag(tag);
toCommit->addTypedMessage(LogProtocolMessage());
toCommit->addTag(tag);
toCommit->addTypedMessage(privatized);
}
if(!initialCommit) {
txnStateStore->set(KeyValueRef(m.param1, m.param2));
if(storageCache) {
auto cacheItr = storageCache->find(id);
if(cacheItr == storageCache->end()) {
Reference<StorageInfo> storageInfo = Reference<StorageInfo>( new StorageInfo() );
storageInfo->tag = tag;
Optional<Key> interfKey = txnStateStore->readValue( serverListKeyFor(id) ).get();
if(interfKey.present()) {
storageInfo->interf = decodeServerListValue( interfKey.get() );
}
(*storageCache)[id] = storageInfo;
} else {
cacheItr->second->tag = tag;
//These tag vectors will be repopulated by the proxy when it detects their sizes are 0.
for(auto& it : keyInfo->ranges()) {
it.value().tags.clear();
}
}
}
}
}
else if (m.param1.startsWith(configKeysPrefix) || m.param1 == coordinatorsKey) {
if(Optional<StringRef>(m.param2) != txnStateStore->readValue(m.param1).get().castTo<StringRef>()) { // FIXME: Make this check more specific, here or by reading configuration whenever there is a change
if(!m.param1.startsWith( excludedServersPrefix ) && m.param1 != excludedServersVersionKey) {
auto t = txnStateStore->readValue(m.param1).get();
TraceEvent("MutationRequiresRestart", dbgid)
.detail("M", m.toString())
.detail("PrevValue", t.present() ? t.get() : LiteralStringRef("(none)"))
.detail("ToCommit", toCommit!=NULL);
if(confChange) *confChange = true;
}
}
if(!initialCommit) txnStateStore->set(KeyValueRef(m.param1, m.param2));
}
else if (m.param1.startsWith(serverListPrefix)) {
if(!initialCommit) {
txnStateStore->set(KeyValueRef(m.param1, m.param2));
if(storageCache) {
UID id = decodeServerListKey(m.param1);
StorageServerInterface interf = decodeServerListValue(m.param2);
auto cacheItr = storageCache->find(id);
if(cacheItr == storageCache->end()) {
Reference<StorageInfo> storageInfo = Reference<StorageInfo>( new StorageInfo() );
storageInfo->interf = interf;
Optional<Key> tagKey = txnStateStore->readValue( serverTagKeyFor(id) ).get();
if(tagKey.present()) {
storageInfo->tag = decodeServerTagValue( tagKey.get() );
}
(*storageCache)[id] = storageInfo;
} else {
cacheItr->second->interf = interf;
}
}
}
} else if( m.param1 == databaseLockedKey || m.param1 == metadataVersionKey || m.param1 == mustContainSystemMutationsKey || m.param1.startsWith(applyMutationsBeginRange.begin) ||
m.param1.startsWith(applyMutationsAddPrefixRange.begin) || m.param1.startsWith(applyMutationsRemovePrefixRange.begin) || m.param1.startsWith(tagLocalityListPrefix) || m.param1.startsWith(serverTagHistoryPrefix) || m.param1.startsWith(testOnlyTxnStateStorePrefixRange.begin) ) {
if(!initialCommit) txnStateStore->set(KeyValueRef(m.param1, m.param2));
}
else if (m.param1.startsWith(applyMutationsEndRange.begin)) {
if(!initialCommit) txnStateStore->set(KeyValueRef(m.param1, m.param2));
if(uid_applyMutationsData != NULL) {
Key uid = m.param1.removePrefix(applyMutationsEndRange.begin);
auto &p = (*uid_applyMutationsData)[uid];
p.endVersion = BinaryReader::fromStringRef<Version>(m.param2, Unversioned());
if(p.keyVersion == Reference<KeyRangeMap<Version>>())
p.keyVersion = Reference<KeyRangeMap<Version>>( new KeyRangeMap<Version>() );
if(!p.worker.isValid() || p.worker.isReady()) {
auto addPrefixValue = txnStateStore->readValue(uid.withPrefix(applyMutationsAddPrefixRange.begin)).get();
auto removePrefixValue = txnStateStore->readValue(uid.withPrefix(applyMutationsRemovePrefixRange.begin)).get();
auto beginValue = txnStateStore->readValue(uid.withPrefix(applyMutationsBeginRange.begin)).get();
p.worker = applyMutations( cx, uid, addPrefixValue.present() ? addPrefixValue.get() : Key(),
removePrefixValue.present() ? removePrefixValue.get() : Key(),
beginValue.present() ? BinaryReader::fromStringRef<Version>(beginValue.get(), Unversioned()) : 0,
&p.endVersion, commit, commitVersion, p.keyVersion );
}
}
}
else if (m.param1.startsWith(applyMutationsKeyVersionMapRange.begin)) {
if(!initialCommit) txnStateStore->set(KeyValueRef(m.param1, m.param2));
if(uid_applyMutationsData != NULL) {
if(m.param1.size() >= applyMutationsKeyVersionMapRange.begin.size() + sizeof(UID)) {
Key uid = m.param1.substr(applyMutationsKeyVersionMapRange.begin.size(), sizeof(UID));
Key k = m.param1.substr(applyMutationsKeyVersionMapRange.begin.size() + sizeof(UID));
auto &p = (*uid_applyMutationsData)[uid];
if(p.keyVersion == Reference<KeyRangeMap<Version>>())
p.keyVersion = Reference<KeyRangeMap<Version>>( new KeyRangeMap<Version>() );
p.keyVersion->rawInsert( k, BinaryReader::fromStringRef<Version>(m.param2, Unversioned()) );
}
}
}
else if (m.param1.startsWith(logRangesRange.begin)) {
if(!initialCommit) txnStateStore->set(KeyValueRef(m.param1, m.param2));
if (vecBackupKeys) {
Key logDestination;
KeyRef logRangeBegin = logRangesDecodeKey(m.param1, NULL);
Key logRangeEnd = logRangesDecodeValue(m.param2, &logDestination);
// Insert the logDestination into each range of vecBackupKeys overlapping the decoded range
for (auto& logRange : vecBackupKeys->modify(KeyRangeRef(logRangeBegin, logRangeEnd))) {
logRange->value().insert(logDestination);
}
for (auto& logRange : vecBackupKeys->modify(singleKeyRange(metadataVersionKey))) {
logRange->value().insert(logDestination);
}
// Log the modification
TraceEvent("LogRangeAdd").detail("LogRanges", vecBackupKeys->size()).detail("MutationKey", m.param1)
.detail("LogRangeBegin", logRangeBegin).detail("LogRangeEnd", logRangeEnd);
}
}
else if (m.param1.startsWith(globalKeysPrefix)) {
if(toCommit) {
// Notifies all servers that a Master's server epoch ends
auto allServers = txnStateStore->readRange(serverTagKeys).get();
std::set<Tag> allTags;
if(m.param1 == killStorageKey) {
int8_t safeLocality = BinaryReader::fromStringRef<int8_t>(m.param2, Unversioned());
for (auto &kv : allServers) {
Tag t = decodeServerTagValue(kv.value);
if(t.locality != safeLocality) {
allTags.insert(t);
}
}
} else {
for (auto &kv : allServers) {
allTags.insert(decodeServerTagValue(kv.value));
}
}
if (m.param1 == lastEpochEndKey) {
toCommit->addTags(allTags);
toCommit->addTypedMessage(LogProtocolMessage());
}
MutationRef privatized = m;
privatized.param1 = m.param1.withPrefix(systemKeys.begin, arena);
toCommit->addTags(allTags);
toCommit->addTypedMessage(privatized);
}
}
else if (m.param1 == minRequiredCommitVersionKey) {
Version requested = BinaryReader::fromStringRef<Version>(m.param2, Unversioned());
TraceEvent("MinRequiredCommitVersion", dbgid).detail("Min", requested).detail("Current", popVersion).detail("HasConf", !!confChange);
if(!initialCommit) txnStateStore->set(KeyValueRef(m.param1, m.param2));
if (confChange) *confChange = true;
TEST(true); // Recovering at a higher version.
}
}
else if (m.param2.size() && m.param2[0] == systemKeys.begin[0] && m.type == MutationRef::ClearRange) {
KeyRangeRef range(m.param1, m.param2);
if (keyServersKeys.intersects(range)) {
KeyRangeRef r = range & keyServersKeys;
if(keyInfo) {
KeyRangeRef clearRange(r.begin.removePrefix(keyServersPrefix), r.end.removePrefix(keyServersPrefix));
keyInfo->insert(clearRange, clearRange.begin == StringRef() ? ServerCacheInfo() : keyInfo->rangeContainingKeyBefore(clearRange.begin).value());
}
if(!initialCommit) txnStateStore->clear(r);
}
if (configKeys.intersects(range)) {
if(!initialCommit) txnStateStore->clear(range & configKeys);
if(!excludedServersKeys.contains(range)) {
TraceEvent("MutationRequiresRestart", dbgid).detail("M", m.toString());
if(confChange) *confChange = true;
}
}
if ( serverListKeys.intersects( range )) {
if(!initialCommit) txnStateStore->clear( range & serverListKeys );
}
if ( tagLocalityListKeys.intersects( range )) {
if(!initialCommit) txnStateStore->clear( range & tagLocalityListKeys );
}
if ( serverTagKeys.intersects( range )) {
// Storage server removal always happens in a separate version from any prior writes (or any subsequent reuse of the tag) so we
// can safely destroy the tag here without any concern about intra-batch ordering
if (logSystem && popVersion) {
auto serverKeysCleared = txnStateStore->readRange( range & serverTagKeys ).get(); // read is expected to be immediately available
for(auto &kv : serverKeysCleared) {
Tag tag = decodeServerTagValue(kv.value);
TraceEvent("ServerTagRemove").detail("PopVersion", popVersion).detail("Tag", tag.toString()).detail("Server", decodeServerTagKey(kv.key));
logSystem->pop( popVersion, decodeServerTagValue(kv.value) );
(*tag_popped)[tag] = popVersion;
if(toCommit) {
MutationRef privatized = m;
privatized.param1 = kv.key.withPrefix(systemKeys.begin, arena);
privatized.param2 = keyAfter(kv.key, arena).withPrefix(systemKeys.begin, arena);
toCommit->addTag(decodeServerTagValue(kv.value));
toCommit->addTypedMessage(privatized);
}
}
}
if(!initialCommit) {
KeyRangeRef clearRange = range & serverTagKeys;
txnStateStore->clear(clearRange);
if(storageCache && clearRange.singleKeyRange()) {
storageCache->erase(decodeServerTagKey(clearRange.begin));
}
}
}
if ( serverTagHistoryKeys.intersects( range )) {
//Once a tag has been removed from history we should pop it, since we no longer have a record of the tag once it has been removed from history
if (logSystem && popVersion) {
auto serverKeysCleared = txnStateStore->readRange( range & serverTagHistoryKeys ).get(); // read is expected to be immediately available
for(auto &kv : serverKeysCleared) {
Tag tag = decodeServerTagValue(kv.value);
TraceEvent("ServerTagHistoryRemove").detail("PopVersion", popVersion).detail("Tag", tag.toString()).detail("Version", decodeServerTagHistoryKey(kv.key));
logSystem->pop( popVersion, tag );
(*tag_popped)[tag] = popVersion;
}
}
if(!initialCommit) txnStateStore->clear( range & serverTagHistoryKeys );
}
if (range.contains(coordinatorsKey)) {
if(!initialCommit) txnStateStore->clear(singleKeyRange(coordinatorsKey));
}
if (range.contains(databaseLockedKey)) {
if(!initialCommit) txnStateStore->clear(singleKeyRange(databaseLockedKey));
}
if (range.contains(metadataVersionKey)) {
if(!initialCommit) txnStateStore->clear(singleKeyRange(metadataVersionKey));
}
if (range.contains(mustContainSystemMutationsKey)) {
if(!initialCommit) txnStateStore->clear(singleKeyRange(mustContainSystemMutationsKey));
}
if (range.intersects(testOnlyTxnStateStorePrefixRange)) {
if(!initialCommit) txnStateStore->clear(range & testOnlyTxnStateStorePrefixRange);
}
if(range.intersects(applyMutationsEndRange)) {
KeyRangeRef commonEndRange(range & applyMutationsEndRange);
if(!initialCommit) txnStateStore->clear(commonEndRange);
if(uid_applyMutationsData != NULL) {
uid_applyMutationsData->erase(uid_applyMutationsData->lower_bound(m.param1.substr(applyMutationsEndRange.begin.size())),
m.param2 == applyMutationsEndRange.end ? uid_applyMutationsData->end() : uid_applyMutationsData->lower_bound(m.param2.substr(applyMutationsEndRange.begin.size())));
}
}
if(range.intersects(applyMutationsKeyVersionMapRange)) {
KeyRangeRef commonApplyRange(range & applyMutationsKeyVersionMapRange);
if(!initialCommit) txnStateStore->clear(commonApplyRange);
if(uid_applyMutationsData != NULL) {
if(m.param1.size() >= applyMutationsKeyVersionMapRange.begin.size() + sizeof(UID) && m.param2.size() >= applyMutationsKeyVersionMapRange.begin.size() + sizeof(UID)) {
Key uid = m.param1.substr(applyMutationsKeyVersionMapRange.begin.size(), sizeof(UID));
Key uid2 = m.param2.substr(applyMutationsKeyVersionMapRange.begin.size(), sizeof(UID));
if(uid == uid2) {
auto &p = (*uid_applyMutationsData)[uid];
if(p.keyVersion == Reference<KeyRangeMap<Version>>())
p.keyVersion = Reference<KeyRangeMap<Version>>( new KeyRangeMap<Version>() );
p.keyVersion->rawErase( KeyRangeRef( m.param1.substr(applyMutationsKeyVersionMapRange.begin.size() + sizeof(UID)), m.param2.substr(applyMutationsKeyVersionMapRange.begin.size() + sizeof(UID))) );
}
}
}
}
if (range.intersects(logRangesRange)) {
KeyRangeRef commonLogRange(range & logRangesRange);
TraceEvent("LogRangeClear")
.detail("RangeBegin", range.begin).detail("RangeEnd", range.end)
.detail("IntersectBegin", commonLogRange.begin).detail("IntersectEnd", commonLogRange.end);
// Remove the key range from the vector, if defined
if (vecBackupKeys) {
KeyRef logKeyBegin;
Key logKeyEnd, logDestination;
// Identify the backup keys being removed
// read is expected to be immediately available
auto logRangesAffected = txnStateStore->readRange(commonLogRange).get();
TraceEvent("LogRangeClearBegin").detail("AffectedLogRanges", logRangesAffected.size());
// Add the backup name to the backup locations that do not have it
for (auto logRangeAffected : logRangesAffected)
{
// Parse the backup key and name
logKeyBegin = logRangesDecodeKey(logRangeAffected.key, NULL);
// Decode the log destination and key value
logKeyEnd = logRangesDecodeValue(logRangeAffected.value, &logDestination);
TraceEvent("LogRangeErase").detail("AffectedKey", logRangeAffected.key).detail("AffectedValue", logRangeAffected.value)
.detail("LogKeyBegin", logKeyBegin).detail("LogKeyEnd", logKeyEnd)
.detail("LogDestination", logDestination);
// Identify the locations to place the backup key
auto logRanges = vecBackupKeys->modify(KeyRangeRef(logKeyBegin, logKeyEnd));
// Remove the log prefix from the ranges which include it
for (auto logRange : logRanges)
{
auto &logRangeMap = logRange->value();
// Remove the backup name from the range
logRangeMap.erase(logDestination);
}
bool foundKey = false;
for(auto &it : vecBackupKeys->intersectingRanges(normalKeys)) {
if(it.value().count(logDestination) > 0) {
foundKey = true;
break;
}
}
if(!foundKey) {
auto logRanges = vecBackupKeys->modify(singleKeyRange(metadataVersionKey));
for (auto logRange : logRanges) {
auto &logRangeMap = logRange->value();
logRangeMap.erase(logDestination);
}
}
}
// Coallesce the entire range
vecBackupKeys->coalesce(allKeys);
}
if(!initialCommit) txnStateStore->clear(commonLogRange);
}
}
}
}
#endif
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