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foundationdb/fdbserver/OldTLogServer.actor.cpp

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/*
* OldTLogServer.actor.cpp
*
* 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.
*/
#include "flow/Hash3.h"
#include "flow/Stats.h"
#include "flow/UnitTest.h"
#include "fdbclient/NativeAPI.h"
#include "fdbclient/Notified.h"
#include "fdbclient/KeyRangeMap.h"
#include "fdbclient/SystemData.h"
#include "fdbserver/WorkerInterface.h"
#include "fdbserver/TLogInterface.h"
#include "fdbserver/Knobs.h"
#include "fdbserver/IKeyValueStore.h"
#include "flow/ActorCollection.h"
#include "fdbrpc/FailureMonitor.h"
#include "fdbserver/IDiskQueue.h"
#include "fdbrpc/sim_validation.h"
#include "fdbserver/ServerDBInfo.h"
#include "fdbserver/LogSystem.h"
#include "fdbserver/WaitFailure.h"
#include "flow/actorcompiler.h" // This must be the last #include.
using std::pair;
using std::make_pair;
using std::min;
using std::max;
namespace oldTLog {
typedef int16_t OldTag;
OldTag convertTag( Tag tag ) {
if(tag == invalidTag) return invalidTagOld;
if(tag == txsTag) return txsTagOld;
ASSERT(tag.id >= 0);
return tag.id;
}
Tag convertOldTag( OldTag tag ) {
if(tag == invalidTagOld) return invalidTag;
if(tag == txsTagOld) return txsTag;
ASSERT(tag >= 0);
return Tag(tagLocalityUpgraded, tag);
}
struct OldTagMessagesRef {
OldTag tag;
VectorRef<int> messageOffsets;
OldTagMessagesRef() {}
OldTagMessagesRef(Arena &a, const OldTagMessagesRef &from) : tag(from.tag), messageOffsets(a, from.messageOffsets) {}
size_t expectedSize() const {
return messageOffsets.expectedSize();
}
template <class Ar>
void serialize(Ar& ar) {
serializer(ar, tag, messageOffsets);
}
};
struct TLogQueueEntryRef {
UID id;
Version version;
Version knownCommittedVersion;
StringRef messages;
VectorRef< OldTagMessagesRef > tags;
TLogQueueEntryRef() : version(0), knownCommittedVersion(0) {}
TLogQueueEntryRef(Arena &a, TLogQueueEntryRef const &from)
: version(from.version), knownCommittedVersion(from.knownCommittedVersion), id(from.id), messages(a, from.messages), tags(a, from.tags) {
}
template <class Ar>
void serialize(Ar& ar) {
if( ar.protocolVersion() >= 0x0FDB00A460010001) {
serializer(ar, version, messages, tags, knownCommittedVersion, id);
} else if(ar.isDeserializing) {
serializer(ar, version, messages, tags);
knownCommittedVersion = 0;
id = UID();
}
}
size_t expectedSize() const {
return messages.expectedSize() + tags.expectedSize();
}
};
typedef Standalone<TLogQueueEntryRef> TLogQueueEntry;
struct TLogQueue : public IClosable {
public:
TLogQueue( IDiskQueue* queue, UID dbgid ) : queue(queue), dbgid(dbgid) {}
// Each packet in the queue is
// uint32_t payloadSize
// uint8_t payload[payloadSize] (begins with uint64_t protocolVersion via IncludeVersion)
// uint8_t validFlag
// TLogQueue is a durable queue of TLogQueueEntry objects with an interface similar to IDiskQueue
// TLogQueue pushes (but not commits) are atomic - after commit fails to return, a prefix of entire calls to push are durable. This is
// implemented on top of the weaker guarantee of IDiskQueue::commit (that a prefix of bytes is durable) using validFlag and by
// padding any incomplete packet with zeros after recovery.
// Before calling push, pop, or commit, the user must call readNext() until it throws
// end_of_stream(). It may not be called again thereafter.
Future<TLogQueueEntry> readNext() {
return readNext( this );
}
void push( TLogQueueEntryRef const& qe ) {
BinaryWriter wr( Unversioned() ); // outer framing is not versioned
wr << uint32_t(0);
IncludeVersion().write(wr); // payload is versioned
wr << qe;
wr << uint8_t(1);
*(uint32_t*)wr.getData() = wr.getLength() - sizeof(uint32_t) - sizeof(uint8_t);
auto loc = queue->push( wr.toStringRef() );
//TraceEvent("TLogQueueVersionWritten", dbgid).detail("Size", wr.getLength() - sizeof(uint32_t) - sizeof(uint8_t)).detail("Loc", loc);
version_location[qe.version] = loc;
}
void pop( Version upTo ) {
// Keep only the given and all subsequent version numbers
// Find the first version >= upTo
auto v = version_location.lower_bound(upTo);
if (v == version_location.begin()) return;
if(v == version_location.end()) {
v = version_location.lastItem();
}
else {
v.decrementNonEnd();
}
queue->pop( v->value );
version_location.erase( version_location.begin(), v ); // ... and then we erase that previous version and all prior versions
}
Future<Void> commit() { return queue->commit(); }
// Implements IClosable
virtual Future<Void> getError() { return queue->getError(); }
virtual Future<Void> onClosed() { return queue->onClosed(); }
virtual void dispose() { queue->dispose(); delete this; }
virtual void close() { queue->close(); delete this; }
private:
IDiskQueue* queue;
Map<Version, IDiskQueue::location> version_location; // For the version of each entry that was push()ed, the end location of the serialized bytes
UID dbgid;
ACTOR static Future<TLogQueueEntry> readNext( TLogQueue* self ) {
state TLogQueueEntry result;
state int zeroFillSize = 0;
loop {
Standalone<StringRef> h = wait( self->queue->readNext( sizeof(uint32_t) ) );
if (h.size() != sizeof(uint32_t)) {
if (h.size()) {
TEST( true ); // Zero fill within size field
int payloadSize = 0;
memcpy(&payloadSize, h.begin(), h.size());
zeroFillSize = sizeof(uint32_t)-h.size(); // zero fill the size itself
zeroFillSize += payloadSize+1; // and then the contents and valid flag
}
break;
}
state uint32_t payloadSize = *(uint32_t*)h.begin();
ASSERT( payloadSize < (100<<20) );
Standalone<StringRef> e = wait( self->queue->readNext( payloadSize+1 ) );
if (e.size() != payloadSize+1) {
TEST( true ); // Zero fill within payload
zeroFillSize = payloadSize+1 - e.size();
break;
}
if (e[payloadSize]) {
Arena a = e.arena();
ArenaReader ar( a, e.substr(0, payloadSize), IncludeVersion() );
ar >> result;
self->version_location[result.version] = self->queue->getNextReadLocation();
return result;
}
}
if (zeroFillSize) {
TEST( true ); // Fixing a partial commit at the end of the tlog queue
for(int i=0; i<zeroFillSize; i++)
self->queue->push( StringRef((const uint8_t*)"",1) );
}
throw end_of_stream();
}
};
////// Persistence format (for self->persistentData)
// Immutable keys
static const KeyValueRef persistFormat( LiteralStringRef( "Format" ), LiteralStringRef("FoundationDB/LogServer/2/3") );
static const KeyRangeRef persistFormatReadableRange( LiteralStringRef("FoundationDB/LogServer/2/3"), LiteralStringRef("FoundationDB/LogServer/2/4") );
static const KeyRangeRef persistRecoveryCountKeys = KeyRangeRef( LiteralStringRef( "DbRecoveryCount/" ), LiteralStringRef( "DbRecoveryCount0" ) );
// Updated on updatePersistentData()
static const KeyRangeRef persistCurrentVersionKeys = KeyRangeRef( LiteralStringRef( "version/" ), LiteralStringRef( "version0" ) );
static const KeyRange persistTagMessagesKeys = prefixRange(LiteralStringRef("TagMsg/"));
static const KeyRange persistTagPoppedKeys = prefixRange(LiteralStringRef("TagPop/"));
static Key persistTagMessagesKey( UID id, OldTag tag, Version version ) {
BinaryWriter wr( Unversioned() );
wr.serializeBytes(persistTagMessagesKeys.begin);
wr << id;
wr << tag;
wr << bigEndian64( version );
return wr.toStringRef();
}
static Key persistTagPoppedKey( UID id, OldTag tag ) {
BinaryWriter wr(Unversioned());
wr.serializeBytes( persistTagPoppedKeys.begin );
wr << id;
wr << tag;
return wr.toStringRef();
}
static Value persistTagPoppedValue( Version popped ) {
return BinaryWriter::toValue( popped, Unversioned() );
}
static OldTag decodeTagPoppedKey( KeyRef id, KeyRef key ) {
OldTag s;
BinaryReader rd( key.removePrefix(persistTagPoppedKeys.begin).removePrefix(id), Unversioned() );
rd >> s;
return s;
}
static Version decodeTagPoppedValue( ValueRef value ) {
return BinaryReader::fromStringRef<Version>( value, Unversioned() );
}
static StringRef stripTagMessagesKey( StringRef key ) {
return key.substr( sizeof(UID) + sizeof(OldTag) + persistTagMessagesKeys.begin.size() );
}
static Version decodeTagMessagesKey( StringRef key ) {
return bigEndian64( BinaryReader::fromStringRef<Version>( stripTagMessagesKey(key), Unversioned() ) );
}
struct TLogData : NonCopyable {
AsyncTrigger newLogData;
Deque<UID> queueOrder;
std::map<UID, Reference<struct LogData>> id_data;
UID dbgid;
IKeyValueStore* persistentData;
IDiskQueue* rawPersistentQueue;
TLogQueue *persistentQueue;
int64_t diskQueueCommitBytes;
AsyncVar<bool> largeDiskQueueCommitBytes; //becomes true when diskQueueCommitBytes is greater than MAX_QUEUE_COMMIT_BYTES
Reference<AsyncVar<ServerDBInfo>> dbInfo;
NotifiedVersion queueCommitEnd;
Version queueCommitBegin;
AsyncTrigger newVersion;
int64_t instanceID;
int64_t bytesInput;
int64_t bytesDurable;
Version prevVersion;
struct PeekTrackerData {
std::map<int, Promise<Version>> sequence_version;
double lastUpdate;
};
std::map<UID, PeekTrackerData> peekTracker;
WorkerCache<TLogInterface> tlogCache;
Future<Void> updatePersist; //SOMEDAY: integrate the recovery and update storage so that only one of them is committing to persistant data.
PromiseStream<Future<Void>> sharedActors;
bool terminated;
TLogData(UID dbgid, IKeyValueStore* persistentData, IDiskQueue * persistentQueue, Reference<AsyncVar<ServerDBInfo>> const& dbInfo)
: dbgid(dbgid), instanceID(g_random->randomUniqueID().first()),
persistentData(persistentData), rawPersistentQueue(persistentQueue), persistentQueue(new TLogQueue(persistentQueue, dbgid)),
dbInfo(dbInfo), queueCommitBegin(0), queueCommitEnd(0), prevVersion(0),
diskQueueCommitBytes(0), largeDiskQueueCommitBytes(false),
bytesInput(0), bytesDurable(0), updatePersist(Void()), terminated(false)
{
}
};
struct LogData : NonCopyable, public ReferenceCounted<LogData> {
struct TagData {
std::deque<std::pair<Version, LengthPrefixedStringRef>> version_messages;
bool nothing_persistent; // true means tag is *known* to have no messages in persistentData. false means nothing.
bool popped_recently; // `popped` has changed since last updatePersistentData
Version popped; // see popped version tracking contract below
bool update_version_sizes;
TagData( Version popped, bool nothing_persistent, bool popped_recently, OldTag tag ) : nothing_persistent(nothing_persistent), popped(popped), popped_recently(popped_recently), update_version_sizes(tag != txsTagOld) {}
TagData(TagData&& r) noexcept(true) : version_messages(std::move(r.version_messages)), nothing_persistent(r.nothing_persistent), popped_recently(r.popped_recently), popped(r.popped), update_version_sizes(r.update_version_sizes) {}
void operator= (TagData&& r) noexcept(true) {
version_messages = std::move(r.version_messages);
nothing_persistent = r.nothing_persistent;
popped_recently = r.popped_recently;
popped = r.popped;
update_version_sizes = r.update_version_sizes;
}
// Erase messages not needed to update *from* versions >= before (thus, messages with toversion <= before)
ACTOR Future<Void> eraseMessagesBefore( TagData *self, Version before, int64_t* gBytesErased, Reference<LogData> tlogData, int taskID ) {
while(!self->version_messages.empty() && self->version_messages.front().first < before) {
Version version = self->version_messages.front().first;
std::pair<int, int> &sizes = tlogData->version_sizes[version];
int64_t messagesErased = 0;
while(!self->version_messages.empty() && self->version_messages.front().first == version) {
auto const& m = self->version_messages.front();
++messagesErased;
if(self->update_version_sizes) {
sizes.first -= m.second.expectedSize();
}
self->version_messages.pop_front();
}
int64_t bytesErased = (messagesErased * sizeof(std::pair<Version, LengthPrefixedStringRef>) * SERVER_KNOBS->VERSION_MESSAGES_OVERHEAD_FACTOR_1024THS) >> 10;
tlogData->bytesDurable += bytesErased;
*gBytesErased += bytesErased;
wait(yield(taskID));
}
return Void();
}
Future<Void> eraseMessagesBefore(Version before, int64_t* gBytesErased, Reference<LogData> tlogData, int taskID) {
return eraseMessagesBefore(this, before, gBytesErased, tlogData, taskID);
}
};
/*
Popped version tracking contract needed by log system to implement ILogCursor::popped():
- Log server tracks for each (possible) tag a popped_version
Impl: TagData::popped (in memory) and persistTagPoppedKeys (in persistentData)
- popped_version(tag) is <= the maximum version for which log server (or a predecessor) is ever asked to pop the tag
Impl: Only increased by tLogPop() in response to either a pop request or recovery from a predecessor
- popped_version(tag) is > the maximum version for which log server is unable to peek messages due to previous pops (on this server or a predecessor)
Impl: Increased by tLogPop() atomically with erasing messages from memory; persisted by updatePersistentData() atomically with erasing messages from store; messages are not erased from queue where popped_version is not persisted
- LockTLogReply returns all tags which either have messages, or which have nonzero popped_versions
Impl: tag_data is present for all such tags
- peek(tag, v) returns the popped_version for tag if that is greater than v
Impl: Check tag_data->popped (after all waits)
*/
bool stopped, initialized;
DBRecoveryCount recoveryCount;
VersionMetricHandle persistentDataVersion, persistentDataDurableVersion; // The last version number in the portion of the log (written|durable) to persistentData
NotifiedVersion version, queueCommittedVersion;
Version queueCommittingVersion;
Version knownCommittedVersion;
Deque<std::pair<Version, Standalone<VectorRef<uint8_t>>>> messageBlocks;
Map< OldTag, TagData > tag_data;
Map<Version, std::pair<int,int>> version_sizes;
CounterCollection cc;
Counter bytesInput;
Counter bytesDurable;
UID logId;
Version newPersistentDataVersion;
Future<Void> removed;
TLogInterface tli;
PromiseStream<Future<Void>> addActor;
TLogData* tLogData;
Promise<bool> recoverySuccessful;
Future<Void> recovery;
explicit LogData(TLogData* tLogData, TLogInterface interf) : tLogData(tLogData), knownCommittedVersion(0), tli(interf), logId(interf.id()),
cc("TLog", interf.id().toString()),
bytesInput("BytesInput", cc),
bytesDurable("BytesDurable", cc),
// These are initialized differently on init() or recovery
recoveryCount(), stopped(false), initialized(false), queueCommittingVersion(0), newPersistentDataVersion(invalidVersion), recovery(Void())
{
startRole(Role::TRANSACTION_LOG,interf.id(), UID());
persistentDataVersion.init(LiteralStringRef("TLog.PersistentDataVersion"), cc.id);
persistentDataDurableVersion.init(LiteralStringRef("TLog.PersistentDataDurableVersion"), cc.id);
version.initMetric(LiteralStringRef("TLog.Version"), cc.id);
queueCommittedVersion.initMetric(LiteralStringRef("TLog.QueueCommittedVersion"), cc.id);
specialCounter(cc, "Version", [this](){ return this->version.get(); });
specialCounter(cc, "SharedBytesInput", [tLogData](){ return tLogData->bytesInput; });
specialCounter(cc, "SharedBytesDurable", [tLogData](){ return tLogData->bytesDurable; });
specialCounter(cc, "KvstoreBytesUsed", [tLogData](){ return tLogData->persistentData->getStorageBytes().used; });
specialCounter(cc, "KvstoreBytesFree", [tLogData](){ return tLogData->persistentData->getStorageBytes().free; });
specialCounter(cc, "KvstoreBytesAvailable", [tLogData](){ return tLogData->persistentData->getStorageBytes().available; });
specialCounter(cc, "KvstoreBytesTotal", [tLogData](){ return tLogData->persistentData->getStorageBytes().total; });
specialCounter(cc, "QueueDiskBytesUsed", [tLogData](){ return tLogData->rawPersistentQueue->getStorageBytes().used; });
specialCounter(cc, "QueueDiskBytesFree", [tLogData](){ return tLogData->rawPersistentQueue->getStorageBytes().free; });
specialCounter(cc, "QueueDiskBytesAvailable", [tLogData](){ return tLogData->rawPersistentQueue->getStorageBytes().available; });
specialCounter(cc, "QueueDiskBytesTotal", [tLogData](){ return tLogData->rawPersistentQueue->getStorageBytes().total; });
}
~LogData() {
tLogData->bytesDurable += bytesInput.getValue() - bytesDurable.getValue();
TraceEvent("TLogBytesWhenRemoved", tli.id()).detail("SharedBytesInput", tLogData->bytesInput).detail("SharedBytesDurable", tLogData->bytesDurable).detail("LocalBytesInput", bytesInput.getValue()).detail("LocalBytesDurable", bytesDurable.getValue());
ASSERT_ABORT(tLogData->bytesDurable <= tLogData->bytesInput);
endRole(Role::TRANSACTION_LOG, tli.id(), "Error", true);
if(!tLogData->terminated) {
Key logIdKey = BinaryWriter::toValue(logId,Unversioned());
tLogData->persistentData->clear( singleKeyRange(logIdKey.withPrefix(persistCurrentVersionKeys.begin)) );
tLogData->persistentData->clear( singleKeyRange(logIdKey.withPrefix(persistRecoveryCountKeys.begin)) );
Key msgKey = logIdKey.withPrefix(persistTagMessagesKeys.begin);
tLogData->persistentData->clear( KeyRangeRef( msgKey, strinc(msgKey) ) );
Key poppedKey = logIdKey.withPrefix(persistTagPoppedKeys.begin);
tLogData->persistentData->clear( KeyRangeRef( poppedKey, strinc(poppedKey) ) );
}
}
LogEpoch epoch() const { return recoveryCount; }
};
ACTOR Future<Void> tLogLock( TLogData* self, ReplyPromise< TLogLockResult > reply, Reference<LogData> logData ) {
state Version stopVersion = logData->version.get();
TEST(true); // TLog stopped by recovering master
TEST( logData->stopped );
TEST( !logData->stopped );
TraceEvent("TLogStop", logData->logId).detail("Ver", stopVersion).detail("IsStopped", logData->stopped).detail("QueueCommitted", logData->queueCommittedVersion.get());
logData->stopped = true;
if(logData->recoverySuccessful.canBeSet()) {
logData->recoverySuccessful.send(false);
}
// Lock once the current version has been committed
wait( logData->queueCommittedVersion.whenAtLeast( stopVersion ) );
ASSERT(stopVersion == logData->version.get());
TLogLockResult result;
result.end = stopVersion;
result.knownCommittedVersion = logData->knownCommittedVersion;
TraceEvent("TLogStop2", self->dbgid).detail("LogId", logData->logId).detail("Ver", stopVersion).detail("IsStopped", logData->stopped).detail("QueueCommitted", logData->queueCommittedVersion.get());
reply.send( result );
return Void();
}
void updatePersistentPopped( TLogData* self, Reference<LogData> logData, OldTag tag, LogData::TagData& data ) {
if (!data.popped_recently) return;
self->persistentData->set(KeyValueRef( persistTagPoppedKey(logData->logId, tag), persistTagPoppedValue(data.popped) ));
data.popped_recently = false;
if (data.nothing_persistent) return;
self->persistentData->clear( KeyRangeRef(
persistTagMessagesKey( logData->logId, tag, Version(0) ),
persistTagMessagesKey( logData->logId, tag, data.popped ) ) );
if (data.popped > logData->persistentDataVersion)
data.nothing_persistent = true;
}
ACTOR Future<Void> updatePersistentData( TLogData* self, Reference<LogData> logData, Version newPersistentDataVersion ) {
// PERSIST: Changes self->persistentDataVersion and writes and commits the relevant changes
ASSERT( newPersistentDataVersion <= logData->version.get() );
ASSERT( newPersistentDataVersion <= logData->queueCommittedVersion.get() );
ASSERT( newPersistentDataVersion > logData->persistentDataVersion );
ASSERT( logData->persistentDataVersion == logData->persistentDataDurableVersion );
//TraceEvent("UpdatePersistentData", self->dbgid).detail("Seq", newPersistentDataSeq);
state bool anyData = false;
state Map<OldTag, LogData::TagData>::iterator tag;
// For all existing tags
for(tag = logData->tag_data.begin(); tag != logData->tag_data.end(); ++tag) {
state Version currentVersion = 0;
// Clear recently popped versions from persistentData if necessary
updatePersistentPopped( self, logData, tag->key, tag->value );
// Transfer unpopped messages with version numbers less than newPersistentDataVersion to persistentData
state std::deque<std::pair<Version, LengthPrefixedStringRef>>::iterator msg = tag->value.version_messages.begin();
while(msg != tag->value.version_messages.end() && msg->first <= newPersistentDataVersion) {
currentVersion = msg->first;
anyData = true;
tag->value.nothing_persistent = false;
BinaryWriter wr( Unversioned() );
for(; msg != tag->value.version_messages.end() && msg->first == currentVersion; ++msg)
wr << msg->second.toStringRef();
self->persistentData->set( KeyValueRef( persistTagMessagesKey( logData->logId, tag->key, currentVersion ), wr.toStringRef() ) );
Future<Void> f = yield(TaskUpdateStorage);
if(!f.isReady()) {
wait(f);
msg = std::upper_bound(tag->value.version_messages.begin(), tag->value.version_messages.end(), std::make_pair(currentVersion, LengthPrefixedStringRef()), CompareFirst<std::pair<Version, LengthPrefixedStringRef>>());
}
}
wait(yield(TaskUpdateStorage));
}
self->persistentData->set( KeyValueRef( BinaryWriter::toValue(logData->logId,Unversioned()).withPrefix(persistCurrentVersionKeys.begin), BinaryWriter::toValue(newPersistentDataVersion, Unversioned()) ) );
logData->persistentDataVersion = newPersistentDataVersion;
wait( self->persistentData->commit() ); // SOMEDAY: This seems to be running pretty often, should we slow it down???
wait( delay(0, TaskUpdateStorage) );
// Now that the changes we made to persistentData are durable, erase the data we moved from memory and the queue, increase bytesDurable accordingly, and update persistentDataDurableVersion.
TEST(anyData); // TLog moved data to persistentData
logData->persistentDataDurableVersion = newPersistentDataVersion;
for(tag = logData->tag_data.begin(); tag != logData->tag_data.end(); ++tag) {
wait(tag->value.eraseMessagesBefore( newPersistentDataVersion+1, &self->bytesDurable, logData, TaskUpdateStorage ));
wait(yield(TaskUpdateStorage));
}
logData->version_sizes.erase(logData->version_sizes.begin(), logData->version_sizes.lower_bound(logData->persistentDataDurableVersion));
wait(yield(TaskUpdateStorage));
while(!logData->messageBlocks.empty() && logData->messageBlocks.front().first <= newPersistentDataVersion) {
int64_t bytesErased = int64_t(logData->messageBlocks.front().second.size()) * SERVER_KNOBS->TLOG_MESSAGE_BLOCK_OVERHEAD_FACTOR;
logData->bytesDurable += bytesErased;
self->bytesDurable += bytesErased;
logData->messageBlocks.pop_front();
wait(yield(TaskUpdateStorage));
}
if(logData->bytesDurable.getValue() > logData->bytesInput.getValue() || self->bytesDurable > self->bytesInput) {
TraceEvent(SevError, "BytesDurableTooLarge", logData->logId).detail("SharedBytesInput", self->bytesInput).detail("SharedBytesDurable", self->bytesDurable).detail("LocalBytesInput", logData->bytesInput.getValue()).detail("LocalBytesDurable", logData->bytesDurable.getValue());
}
ASSERT(logData->bytesDurable.getValue() <= logData->bytesInput.getValue());
ASSERT(self->bytesDurable <= self->bytesInput);
if( self->queueCommitEnd.get() > 0 )
self->persistentQueue->pop( newPersistentDataVersion+1 ); // SOMEDAY: this can cause a slow task (~0.5ms), presumably from erasing too many versions. Should we limit the number of versions cleared at a time?
return Void();
}
// This function (and updatePersistentData, which is called by this function) run at a low priority and can soak up all CPU resources.
// For this reason, they employ aggressive use of yields to avoid causing slow tasks that could introduce latencies for more important
// work (e.g. commits).
ACTOR Future<Void> updateStorage( TLogData* self ) {
while(self->queueOrder.size() && !self->id_data.count(self->queueOrder.front())) {
self->queueOrder.pop_front();
}
if(!self->queueOrder.size()) {
wait( delay(BUGGIFY ? SERVER_KNOBS->BUGGIFY_TLOG_STORAGE_MIN_UPDATE_INTERVAL : SERVER_KNOBS->TLOG_STORAGE_MIN_UPDATE_INTERVAL, TaskUpdateStorage) );
return Void();
}
state Reference<LogData> logData = self->id_data[self->queueOrder.front()];
state Version prevVersion = 0;
state Version nextVersion = 0;
state int totalSize = 0;
if(logData->stopped) {
if (self->bytesInput - self->bytesDurable >= SERVER_KNOBS->TLOG_SPILL_THRESHOLD) {
while(logData->persistentDataDurableVersion != logData->version.get()) {
std::vector<std::pair<std::deque<std::pair<Version, LengthPrefixedStringRef>>::iterator, std::deque<std::pair<Version, LengthPrefixedStringRef>>::iterator>> iters;
for(auto tag = logData->tag_data.begin(); tag != logData->tag_data.end(); ++tag)
iters.push_back(std::make_pair(tag->value.version_messages.begin(), tag->value.version_messages.end()));
nextVersion = 0;
while( totalSize < SERVER_KNOBS->UPDATE_STORAGE_BYTE_LIMIT || nextVersion <= logData->persistentDataVersion ) {
nextVersion = logData->version.get();
for( auto &it : iters )
if(it.first != it.second)
nextVersion = std::min( nextVersion, it.first->first + 1 );
if(nextVersion == logData->version.get())
break;
for( auto &it : iters ) {
while (it.first != it.second && it.first->first < nextVersion) {
totalSize += it.first->second.expectedSize();
++it.first;
}
}
}
wait( logData->queueCommittedVersion.whenAtLeast( nextVersion ) );
wait( delay(0, TaskUpdateStorage) );
//TraceEvent("TlogUpdatePersist", self->dbgid).detail("LogId", logData->logId).detail("NextVersion", nextVersion).detail("Version", logData->version.get()).detail("PersistentDataDurableVer", logData->persistentDataDurableVersion).detail("QueueCommitVer", logData->queueCommittedVersion.get()).detail("PersistDataVer", logData->persistentDataVersion);
if (nextVersion > logData->persistentDataVersion) {
self->updatePersist = updatePersistentData(self, logData, nextVersion);
wait( self->updatePersist );
} else {
wait( delay(BUGGIFY ? SERVER_KNOBS->BUGGIFY_TLOG_STORAGE_MIN_UPDATE_INTERVAL : SERVER_KNOBS->TLOG_STORAGE_MIN_UPDATE_INTERVAL, TaskUpdateStorage) );
}
if( logData->removed.isReady() ) {
break;
}
}
if(logData->persistentDataDurableVersion == logData->version.get()) {
self->queueOrder.pop_front();
}
wait( delay(0.0, TaskUpdateStorage) );
} else {
wait( delay(BUGGIFY ? SERVER_KNOBS->BUGGIFY_TLOG_STORAGE_MIN_UPDATE_INTERVAL : SERVER_KNOBS->TLOG_STORAGE_MIN_UPDATE_INTERVAL, TaskUpdateStorage) );
}
}
else if(logData->initialized) {
ASSERT(self->queueOrder.size() == 1);
state Map<Version, std::pair<int, int>>::iterator sizeItr = logData->version_sizes.begin();
while( totalSize < SERVER_KNOBS->UPDATE_STORAGE_BYTE_LIMIT && sizeItr != logData->version_sizes.end()
&& (logData->bytesInput.getValue() - logData->bytesDurable.getValue() - totalSize >= SERVER_KNOBS->TLOG_SPILL_THRESHOLD || sizeItr->value.first == 0) )
{
wait( yield(TaskUpdateStorage) );
++sizeItr;
nextVersion = sizeItr == logData->version_sizes.end() ? logData->version.get() : sizeItr->key;
state Map<OldTag, LogData::TagData>::iterator tag;
for(tag = logData->tag_data.begin(); tag != logData->tag_data.end(); ++tag) {
auto it = std::lower_bound(tag->value.version_messages.begin(), tag->value.version_messages.end(), std::make_pair(prevVersion, LengthPrefixedStringRef()), CompareFirst<std::pair<Version, LengthPrefixedStringRef>>());
for(; it != tag->value.version_messages.end() && it->first < nextVersion; ++it) {
totalSize += it->second.expectedSize();
}
wait(yield(TaskUpdateStorage));
}
prevVersion = nextVersion;
}
nextVersion = std::max<Version>(nextVersion, logData->persistentDataVersion);
//TraceEvent("UpdateStorageVer", logData->logId).detail("NextVersion", nextVersion).detail("PersistentDataVersion", logData->persistentDataVersion).detail("TotalSize", totalSize);
wait( logData->queueCommittedVersion.whenAtLeast( nextVersion ) );
wait( delay(0, TaskUpdateStorage) );
if (nextVersion > logData->persistentDataVersion) {
self->updatePersist = updatePersistentData(self, logData, nextVersion);
wait( self->updatePersist );
}
if( totalSize < SERVER_KNOBS->UPDATE_STORAGE_BYTE_LIMIT ) {
wait( delay(BUGGIFY ? SERVER_KNOBS->BUGGIFY_TLOG_STORAGE_MIN_UPDATE_INTERVAL : SERVER_KNOBS->TLOG_STORAGE_MIN_UPDATE_INTERVAL, TaskUpdateStorage) );
}
else {
//recovery wants to commit to persistant data when updatePersistentData is not active, this delay ensures that immediately after
//updatePersist returns another one has not been started yet.
wait( delay(0.0, TaskUpdateStorage) );
}
} else {
wait( delay(BUGGIFY ? SERVER_KNOBS->BUGGIFY_TLOG_STORAGE_MIN_UPDATE_INTERVAL : SERVER_KNOBS->TLOG_STORAGE_MIN_UPDATE_INTERVAL, TaskUpdateStorage) );
}
return Void();
}
ACTOR Future<Void> updateStorageLoop( TLogData* self ) {
wait(delay(0, TaskUpdateStorage));
loop {
wait( updateStorage(self) );
}
}
void commitMessages( Reference<LogData> self, Version version, Arena arena, StringRef messages, VectorRef< OldTagMessagesRef > tags, int64_t& bytesInput) {
// SOMEDAY: This method of copying messages is reasonably memory efficient, but it's still a lot of bytes copied. Find a
// way to do the memory allocation right as we receive the messages in the network layer.
int64_t addedBytes = 0;
int64_t expectedBytes = 0;
if(!messages.size()) {
return;
}
StringRef messages1; // the first block of messages, if they aren't all stored contiguously. otherwise empty
// Grab the last block in the blocks list so we can share its arena
// We pop all of the elements of it to create a "fresh" vector that starts at the end of the previous vector
Standalone<VectorRef<uint8_t>> block;
if(self->messageBlocks.empty()) {
block = Standalone<VectorRef<uint8_t>>();
block.reserve(block.arena(), std::max<int64_t>(SERVER_KNOBS->TLOG_MESSAGE_BLOCK_BYTES, messages.size()));
}
else {
block = self->messageBlocks.back().second;
}
block.pop_front(block.size());
// If the current batch of messages doesn't fit entirely in the remainder of the last block in the list
if(messages.size() + block.size() > block.capacity()) {
// Find how many messages will fit
LengthPrefixedStringRef r((uint32_t*)messages.begin());
uint8_t const* end = messages.begin() + block.capacity() - block.size();
while(r.toStringRef().end() <= end) {
r = LengthPrefixedStringRef( (uint32_t*)r.toStringRef().end() );
}
// Fill up the rest of this block
int bytes = (uint8_t*)r.getLengthPtr()-messages.begin();
if (bytes) {
TEST(true); // Splitting commit messages across multiple blocks
messages1 = StringRef(block.end(), bytes);
block.append(block.arena(), messages.begin(), bytes);
self->messageBlocks.push_back( std::make_pair(version, block) );
addedBytes += int64_t(block.size()) * SERVER_KNOBS->TLOG_MESSAGE_BLOCK_OVERHEAD_FACTOR;
messages = messages.substr(bytes);
}
// Make a new block
block = Standalone<VectorRef<uint8_t>>();
block.reserve(block.arena(), std::max<int64_t>(SERVER_KNOBS->TLOG_MESSAGE_BLOCK_BYTES, messages.size()));
}
// Copy messages into block
ASSERT(messages.size() <= block.capacity() - block.size());
block.append(block.arena(), messages.begin(), messages.size());
self->messageBlocks.push_back( std::make_pair(version, block) );
addedBytes += int64_t(block.size()) * SERVER_KNOBS->TLOG_MESSAGE_BLOCK_OVERHEAD_FACTOR;
messages = StringRef(block.end()-messages.size(), messages.size());
for(auto tag = tags.begin(); tag != tags.end(); ++tag) {
int64_t tagMessages = 0;
auto tsm = self->tag_data.find(tag->tag);
if (tsm == self->tag_data.end()) {
tsm = self->tag_data.insert( mapPair(std::move(OldTag(tag->tag)), LogData::TagData(Version(0), true, true, tag->tag) ), false );
}
if (version >= tsm->value.popped) {
for(int m = 0; m < tag->messageOffsets.size(); ++m) {
int offs = tag->messageOffsets[m];
uint8_t const* p = offs < messages1.size() ? messages1.begin() + offs : messages.begin() + offs - messages1.size();
tsm->value.version_messages.push_back(std::make_pair(version, LengthPrefixedStringRef((uint32_t*)p)));
if(tsm->value.version_messages.back().second.expectedSize() > SERVER_KNOBS->MAX_MESSAGE_SIZE) {
TraceEvent(SevWarnAlways, "LargeMessage").detail("Size", tsm->value.version_messages.back().second.expectedSize());
}
if (tag->tag != txsTagOld)
expectedBytes += tsm->value.version_messages.back().second.expectedSize();
++tagMessages;
}
}
// The factor of VERSION_MESSAGES_OVERHEAD is intended to be an overestimate of the actual memory used to store this data in a std::deque.
// In practice, this number is probably something like 528/512 ~= 1.03, but this could vary based on the implementation.
// There will also be a fixed overhead per std::deque, but its size should be trivial relative to the size of the TLog
// queue and can be thought of as increasing the capacity of the queue slightly.
addedBytes += (tagMessages * sizeof(std::pair<Version, LengthPrefixedStringRef>) * SERVER_KNOBS->VERSION_MESSAGES_OVERHEAD_FACTOR_1024THS) >> 10;
}
self->version_sizes[version] = make_pair(expectedBytes, expectedBytes);
self->bytesInput += addedBytes;
bytesInput += addedBytes;
//TraceEvent("TLogPushed", self->dbgid).detail("Bytes", addedBytes).detail("MessageBytes", messages.size()).detail("Tags", tags.size()).detail("ExpectedBytes", expectedBytes).detail("MCount", mCount).detail("TCount", tCount);
}
Version poppedVersion( Reference<LogData> self, OldTag tag) {
auto mapIt = self->tag_data.find(tag);
if (mapIt == self->tag_data.end())
return Version(0);
return mapIt->value.popped;
}
std::deque<std::pair<Version, LengthPrefixedStringRef>> & get_version_messages( Reference<LogData> self, OldTag tag ) {
auto mapIt = self->tag_data.find(tag);
if (mapIt == self->tag_data.end()) {
static std::deque<std::pair<Version, LengthPrefixedStringRef>> empty;
return empty;
}
return mapIt->value.version_messages;
};
ACTOR Future<Void> tLogPop( TLogData* self, TLogPopRequest req, Reference<LogData> logData ) {
OldTag oldTag = convertTag(req.tag);
auto ti = logData->tag_data.find(oldTag);
if (ti == logData->tag_data.end()) {
ti = logData->tag_data.insert( mapPair(oldTag, LogData::TagData(req.to, true, true, oldTag)) );
} else if (req.to > ti->value.popped) {
ti->value.popped = req.to;
ti->value.popped_recently = true;
//if (to.epoch == self->epoch())
if ( req.to > logData->persistentDataDurableVersion )
wait(ti->value.eraseMessagesBefore( req.to, &self->bytesDurable, logData, TaskTLogPop ));
}
req.reply.send(Void());
return Void();
}
void peekMessagesFromMemory( Reference<LogData> self, TLogPeekRequest const& req, BinaryWriter& messages, Version& endVersion ) {
OldTag oldTag = convertTag(req.tag);
ASSERT( !messages.getLength() );
auto& deque = get_version_messages(self, oldTag);
Version begin = std::max( req.begin, self->persistentDataDurableVersion+1 );
auto it = std::lower_bound(deque.begin(), deque.end(), std::make_pair(begin, LengthPrefixedStringRef()), CompareFirst<std::pair<Version, LengthPrefixedStringRef>>());
Version currentVersion = -1;
for(; it != deque.end(); ++it) {
if(it->first != currentVersion) {
if (messages.getLength() >= SERVER_KNOBS->DESIRED_TOTAL_BYTES) {
endVersion = it->first;
//TraceEvent("TLogPeekMessagesReached2", self->dbgid);
break;
}
currentVersion = it->first;
messages << int32_t(-1) << currentVersion;
}
BinaryReader rd( it->second.getLengthPtr(), it->second.expectedSize()+4, Unversioned() );
while(!rd.empty()) {
int32_t messageLength;
uint32_t subVersion;
rd >> messageLength >> subVersion;
messageLength += sizeof(uint16_t) + sizeof(Tag);
messages << messageLength << subVersion << uint16_t(1) << req.tag;
messageLength -= (sizeof(subVersion) + sizeof(uint16_t) + sizeof(Tag));
messages.serializeBytes(rd.readBytes(messageLength), messageLength);
}
}
}
ACTOR Future<Void> tLogPeekMessages( TLogData* self, TLogPeekRequest req, Reference<LogData> logData ) {
state BinaryWriter messages(Unversioned());
state BinaryWriter messages2(Unversioned());
state int sequence = -1;
state UID peekId;
state OldTag oldTag = convertTag(req.tag);
if(req.sequence.present()) {
try {
peekId = req.sequence.get().first;
sequence = req.sequence.get().second;
if(sequence > 0) {
auto& trackerData = self->peekTracker[peekId];
trackerData.lastUpdate = now();
Version ver = wait(trackerData.sequence_version[sequence].getFuture());
req.begin = ver;
wait(yield());
}
} catch( Error &e ) {
if(e.code() == error_code_timed_out) {
req.reply.sendError(timed_out());
return Void();
} else {
throw;
}
}
}
if( req.returnIfBlocked && logData->version.get() < req.begin ) {
req.reply.sendError(end_of_stream());
return Void();
}
//TraceEvent("TLogPeekMessages0", self->dbgid).detail("ReqBeginEpoch", req.begin.epoch).detail("ReqBeginSeq", req.begin.sequence).detail("Epoch", self->epoch()).detail("PersistentDataSeq", self->persistentDataSequence).detail("Tag1", printable(req.tag1)).detail("Tag2", printable(req.tag2));
// Wait until we have something to return that the caller doesn't already have
if( logData->version.get() < req.begin ) {
wait( logData->version.whenAtLeast( req.begin ) );
wait( delay(SERVER_KNOBS->TLOG_PEEK_DELAY, g_network->getCurrentTask()) );
}
state Version endVersion = logData->version.get() + 1;
//grab messages from disk
//TraceEvent("TLogPeekMessages", self->dbgid).detail("ReqBeginEpoch", req.begin.epoch).detail("ReqBeginSeq", req.begin.sequence).detail("Epoch", self->epoch()).detail("PersistentDataSeq", self->persistentDataSequence).detail("Tag1", printable(req.tag1)).detail("Tag2", printable(req.tag2));
if( req.begin <= logData->persistentDataDurableVersion ) {
// Just in case the durable version changes while we are waiting for the read, we grab this data from memory. We may or may not actually send it depending on
// whether we get enough data from disk.
// SOMEDAY: Only do this if an initial attempt to read from disk results in insufficient data and the required data is no longer in memory
// SOMEDAY: Should we only send part of the messages we collected, to actually limit the size of the result?
peekMessagesFromMemory( logData, req, messages2, endVersion );
Standalone<VectorRef<KeyValueRef>> kvs = wait(
self->persistentData->readRange(KeyRangeRef(
persistTagMessagesKey(logData->logId, oldTag, req.begin),
persistTagMessagesKey(logData->logId, oldTag, logData->persistentDataDurableVersion + 1)), SERVER_KNOBS->DESIRED_TOTAL_BYTES, SERVER_KNOBS->DESIRED_TOTAL_BYTES));
//TraceEvent("TLogPeekResults", self->dbgid).detail("ForAddress", req.reply.getEndpoint().address).detail("Tag1Results", s1).detail("Tag2Results", s2).detail("Tag1ResultsLim", kv1.size()).detail("Tag2ResultsLim", kv2.size()).detail("Tag1ResultsLast", kv1.size() ? printable(kv1[0].key) : "").detail("Tag2ResultsLast", kv2.size() ? printable(kv2[0].key) : "").detail("Limited", limited).detail("NextEpoch", next_pos.epoch).detail("NextSeq", next_pos.sequence).detail("NowEpoch", self->epoch()).detail("NowSeq", self->sequence.getNextSequence());
for (auto &kv : kvs) {
auto ver = decodeTagMessagesKey(kv.key);
messages << int32_t(-1) << ver;
BinaryReader rd( kv.value, Unversioned() );
while(!rd.empty()) {
int32_t messageLength;
uint32_t subVersion;
rd >> messageLength >> subVersion;
messageLength += sizeof(uint16_t) + sizeof(Tag);
messages << messageLength << subVersion << uint16_t(1) << req.tag;
messageLength -= (sizeof(subVersion) + sizeof(uint16_t) + sizeof(Tag));
messages.serializeBytes(rd.readBytes(messageLength), messageLength);
}
}
if (kvs.expectedSize() >= SERVER_KNOBS->DESIRED_TOTAL_BYTES)
endVersion = decodeTagMessagesKey(kvs.end()[-1].key) + 1;
else
messages.serializeBytes( messages2.toStringRef() );
} else {
peekMessagesFromMemory( logData, req, messages, endVersion );
//TraceEvent("TLogPeekResults", self->dbgid).detail("ForAddress", req.reply.getEndpoint().address).detail("MessageBytes", messages.getLength()).detail("NextEpoch", next_pos.epoch).detail("NextSeq", next_pos.sequence).detail("NowSeq", self->sequence.getNextSequence());
}
Version poppedVer = poppedVersion(logData, oldTag);
TLogPeekReply reply;
reply.maxKnownVersion = logData->version.get();
reply.minKnownCommittedVersion = 0;
if(poppedVer > req.begin) {
reply.popped = poppedVer;
reply.end = poppedVer;
} else {
reply.messages = messages.toStringRef();
reply.end = endVersion;
}
//TraceEvent("TlogPeek", self->dbgid).detail("LogId", logData->logId).detail("EndVer", reply.end).detail("MsgBytes", reply.messages.expectedSize()).detail("ForAddress", req.reply.getEndpoint().address);
if(req.sequence.present()) {
auto& trackerData = self->peekTracker[peekId];
trackerData.lastUpdate = now();
auto& sequenceData = trackerData.sequence_version[sequence+1];
if(sequenceData.isSet()) {
if(sequenceData.getFuture().get() != reply.end) {
TEST(true); //tlog peek second attempt ended at a different version
req.reply.sendError(timed_out());
return Void();
}
} else {
sequenceData.send(reply.end);
}
reply.begin = req.begin;
}
req.reply.send( reply );
return Void();
}
ACTOR Future<Void> doQueueCommit( TLogData* self, Reference<LogData> logData ) {
state Version ver = logData->version.get();
state Version commitNumber = self->queueCommitBegin+1;
self->queueCommitBegin = commitNumber;
logData->queueCommittingVersion = ver;
Future<Void> c = self->persistentQueue->commit();
self->diskQueueCommitBytes = 0;
self->largeDiskQueueCommitBytes.set(false);
wait(c);
wait(self->queueCommitEnd.whenAtLeast(commitNumber-1));
//Calling check_yield instead of yield to avoid a destruction ordering problem in simulation
if(g_network->check_yield(g_network->getCurrentTask())) {
wait(delay(0, g_network->getCurrentTask()));
}
ASSERT( ver > logData->queueCommittedVersion.get() );
logData->queueCommittedVersion.set(ver);
self->queueCommitEnd.set(commitNumber);
//TraceEvent("TLogCommitDurable", self->dbgid).detail("Version", ver);
return Void();
}
ACTOR Future<Void> commitQueue( TLogData* self ) {
state Reference<LogData> logData;
loop {
int foundCount = 0;
for(auto it : self->id_data) {
if(!it.second->stopped) {
logData = it.second;
foundCount++;
}
}
ASSERT(foundCount < 2);
if(foundCount == 0) {
wait( self->newLogData.onTrigger() );
continue;
}
TraceEvent("CommitQueueNewLog", self->dbgid).detail("LogId", logData->logId).detail("Version", logData->version.get()).detail("Committing", logData->queueCommittingVersion).detail("Commmitted", logData->queueCommittedVersion.get());
loop {
if(logData->stopped && logData->version.get() == std::max(logData->queueCommittingVersion, logData->queueCommittedVersion.get())) {
wait( logData->queueCommittedVersion.whenAtLeast(logData->version.get() ) );
break;
}
choose {
when(wait( logData->version.whenAtLeast( std::max(logData->queueCommittingVersion, logData->queueCommittedVersion.get()) + 1 ) ) ) {
while( self->queueCommitBegin != self->queueCommitEnd.get() && !self->largeDiskQueueCommitBytes.get() ) {
wait( self->queueCommitEnd.whenAtLeast(self->queueCommitBegin) || self->largeDiskQueueCommitBytes.onChange() );
}
self->sharedActors.send(doQueueCommit(self, logData));
}
when(wait(self->newLogData.onTrigger())) {}
}
}
}
}
ACTOR Future<Void> rejoinMasters( TLogData* self, TLogInterface tli, DBRecoveryCount recoveryCount, Future<Void> registerWithMaster ) {
state UID lastMasterID(0,0);
loop {
auto const& inf = self->dbInfo->get();
bool isDisplaced = !std::count( inf.priorCommittedLogServers.begin(), inf.priorCommittedLogServers.end(), tli.id() );
isDisplaced = isDisplaced && inf.recoveryCount >= recoveryCount && inf.recoveryState != RecoveryState::UNINITIALIZED;
if(isDisplaced) {
for(auto& log : inf.logSystemConfig.tLogs) {
if( std::count( log.tLogs.begin(), log.tLogs.end(), tli.id() ) ) {
isDisplaced = false;
break;
}
}
}
if(isDisplaced) {
for(auto& old : inf.logSystemConfig.oldTLogs) {
for(auto& log : old.tLogs) {
if( std::count( log.tLogs.begin(), log.tLogs.end(), tli.id() ) ) {
isDisplaced = false;
break;
}
}
}
}
if ( isDisplaced )
{
TraceEvent("TLogDisplaced", tli.id()).detail("Reason", "DBInfoDoesNotContain").detail("RecoveryCount", recoveryCount).detail("InfRecoveryCount", inf.recoveryCount).detail("RecoveryState", (int)inf.recoveryState)
.detail("LogSysConf", describe(inf.logSystemConfig.tLogs)).detail("PriorLogs", describe(inf.priorCommittedLogServers)).detail("OldLogGens", inf.logSystemConfig.oldTLogs.size());
if (BUGGIFY) wait( delay( SERVER_KNOBS->BUGGIFY_WORKER_REMOVED_MAX_LAG * g_random->random01() ) );
throw worker_removed();
}
if( registerWithMaster.isReady() ) {
if ( self->dbInfo->get().master.id() != lastMasterID) {
// The TLogRejoinRequest is needed to establish communications with a new master, which doesn't have our TLogInterface
TLogRejoinRequest req;
req.myInterface = tli;
TraceEvent("TLogRejoining", self->dbgid).detail("Master", self->dbInfo->get().master.id());
choose {
when ( bool success = wait( brokenPromiseToNever( self->dbInfo->get().master.tlogRejoin.getReply( req ) ) ) ) {
if (success)
lastMasterID = self->dbInfo->get().master.id();
}
when ( wait( self->dbInfo->onChange() ) ) { }
}
} else {
wait( self->dbInfo->onChange() );
}
} else {
wait( registerWithMaster || self->dbInfo->onChange() );
}
}
}
ACTOR Future<Void> cleanupPeekTrackers( TLogData* self ) {
loop {
double minTimeUntilExpiration = SERVER_KNOBS->PEEK_TRACKER_EXPIRATION_TIME;
auto it = self->peekTracker.begin();
while(it != self->peekTracker.end()) {
double timeUntilExpiration = it->second.lastUpdate + SERVER_KNOBS->PEEK_TRACKER_EXPIRATION_TIME - now();
if(timeUntilExpiration < 1.0e-6) {
for(auto seq : it->second.sequence_version) {
if(!seq.second.isSet()) {
seq.second.sendError(timed_out());
}
}
it = self->peekTracker.erase(it);
} else {
minTimeUntilExpiration = std::min(minTimeUntilExpiration, timeUntilExpiration);
++it;
}
}
wait( delay(minTimeUntilExpiration) );
}
}
void getQueuingMetrics( TLogData* self, TLogQueuingMetricsRequest const& req ) {
TLogQueuingMetricsReply reply;
reply.localTime = now();
reply.instanceID = self->instanceID;
reply.bytesInput = self->bytesInput;
reply.bytesDurable = self->bytesDurable;
reply.storageBytes = self->persistentData->getStorageBytes();
reply.v = self->prevVersion;
req.reply.send( reply );
}
ACTOR Future<Void> serveTLogInterface( TLogData* self, TLogInterface tli, Reference<LogData> logData, PromiseStream<Void> warningCollectorInput ) {
loop choose {
when( TLogPeekRequest req = waitNext( tli.peekMessages.getFuture() ) ) {
logData->addActor.send( tLogPeekMessages( self, req, logData ) );
}
when( TLogPopRequest req = waitNext( tli.popMessages.getFuture() ) ) {
logData->addActor.send( tLogPop( self, req, logData ) );
}
when( TLogCommitRequest req = waitNext( tli.commit.getFuture() ) ) {
ASSERT(logData->stopped);
req.reply.sendError( tlog_stopped() );
}
when( ReplyPromise< TLogLockResult > reply = waitNext( tli.lock.getFuture() ) ) {
logData->addActor.send( tLogLock(self, reply, logData) );
}
when (TLogQueuingMetricsRequest req = waitNext(tli.getQueuingMetrics.getFuture())) {
getQueuingMetrics(self, req);
}
when (TLogConfirmRunningRequest req = waitNext(tli.confirmRunning.getFuture())){
if (req.debugID.present() ) {
UID tlogDebugID = g_nondeterministic_random->randomUniqueID();
g_traceBatch.addAttach("TransactionAttachID", req.debugID.get().first(), tlogDebugID.first());
g_traceBatch.addEvent("TransactionDebug", tlogDebugID.first(), "TLogServer.TLogConfirmRunningRequest");
}
ASSERT(logData->stopped);
req.reply.sendError( tlog_stopped() );
}
}
}
void removeLog( TLogData* self, Reference<LogData> logData ) {
TraceEvent("TLogRemoved", logData->logId).detail("Input", logData->bytesInput.getValue()).detail("Durable", logData->bytesDurable.getValue());
logData->stopped = true;
if(logData->recoverySuccessful.canBeSet()) {
logData->recoverySuccessful.send(false);
}
logData->addActor = PromiseStream<Future<Void>>(); //there could be items still in the promise stream if one of the actors threw an error immediately
self->id_data.erase(logData->logId);
if(self->id_data.size()) {
return;
} else {
throw worker_removed();
}
}
ACTOR Future<Void> tLogCore( TLogData* self, Reference<LogData> logData ) {
if(logData->removed.isReady()) {
wait(delay(0)); //to avoid iterator invalidation in restorePersistentState when removed is already ready
ASSERT(logData->removed.isError());
if(logData->removed.getError().code() != error_code_worker_removed) {
throw logData->removed.getError();
}
removeLog(self, logData);
return Void();
}
TraceEvent("NewLogData", self->dbgid).detail("LogId", logData->logId);
logData->initialized = true;
self->newLogData.trigger();
state PromiseStream<Void> warningCollectorInput;
state Future<Void> warningCollector = timeoutWarningCollector( warningCollectorInput.getFuture(), 1.0, "TLogQueueCommitSlow", self->dbgid );
state Future<Void> error = actorCollection( logData->addActor.getFuture() );
logData->addActor.send( logData->recovery );
logData->addActor.send( waitFailureServer(logData->tli.waitFailure.getFuture()) );
logData->addActor.send( logData->removed );
//FIXME: update tlogMetrics to include new information, or possibly only have one copy for the shared instance
logData->addActor.send( traceCounters("TLogMetrics", logData->logId, SERVER_KNOBS->STORAGE_LOGGING_DELAY, &logData->cc, logData->logId.toString() + "/TLogMetrics"));
logData->addActor.send( serveTLogInterface(self, logData->tli, logData, warningCollectorInput) );
try {
wait( error );
throw internal_error();
} catch( Error &e ) {
if( e.code() != error_code_worker_removed )
throw;
removeLog(self, logData);
return Void();
}
}
ACTOR Future<Void> restorePersistentState( TLogData* self, LocalityData locality ) {
state double startt = now();
state Reference<LogData> logData;
state KeyRange tagKeys;
// PERSIST: Read basic state from persistentData; replay persistentQueue but don't erase it
TraceEvent("TLogRestorePersistentState", self->dbgid);
IKeyValueStore *storage = self->persistentData;
state Future<Optional<Value>> fFormat = storage->readValue(persistFormat.key);
state Future<Standalone<VectorRef<KeyValueRef>>> fVers = storage->readRange(persistCurrentVersionKeys);
state Future<Standalone<VectorRef<KeyValueRef>>> fRecoverCounts = storage->readRange(persistRecoveryCountKeys);
// FIXME: metadata in queue?
wait( waitForAll( (vector<Future<Optional<Value>>>(), fFormat ) ) );
wait( waitForAll( (vector<Future<Standalone<VectorRef<KeyValueRef>>>>(), fVers, fRecoverCounts) ) );
if (fFormat.get().present() && !persistFormatReadableRange.contains( fFormat.get().get() )) {
TraceEvent(SevError, "UnsupportedDBFormat", self->dbgid).detail("Format", printable(fFormat.get().get())).detail("Expected", persistFormat.value.toString());
throw worker_recovery_failed();
}
if (!fFormat.get().present()) {
Standalone<VectorRef<KeyValueRef>> v = wait( self->persistentData->readRange( KeyRangeRef(StringRef(), LiteralStringRef("\xff")), 1 ) );
if (!v.size()) {
TEST(true); // The DB is completely empty, so it was never initialized. Delete it.
throw worker_removed();
} else {
// This should never happen
TraceEvent(SevError, "NoDBFormatKey", self->dbgid).detail("FirstKey", printable(v[0].key));
ASSERT( false );
throw worker_recovery_failed();
}
}
state std::vector<Future<ErrorOr<Void>>> removed;
ASSERT(fVers.get().size() == fRecoverCounts.get().size());
state int idx = 0;
state Promise<Void> registerWithMaster;
for(idx = 0; idx < fVers.get().size(); idx++) {
state KeyRef rawId = fVers.get()[idx].key.removePrefix(persistCurrentVersionKeys.begin);
UID id1 = BinaryReader::fromStringRef<UID>( rawId, Unversioned() );
UID id2 = BinaryReader::fromStringRef<UID>( fRecoverCounts.get()[idx].key.removePrefix(persistRecoveryCountKeys.begin), Unversioned() );
ASSERT(id1 == id2);
TLogInterface recruited(id1, self->dbgid, locality);
recruited.initEndpoints();
DUMPTOKEN( recruited.peekMessages );
DUMPTOKEN( recruited.popMessages );
DUMPTOKEN( recruited.commit );
DUMPTOKEN( recruited.lock );
DUMPTOKEN( recruited.getQueuingMetrics );
DUMPTOKEN( recruited.confirmRunning );
logData = Reference<LogData>( new LogData(self, recruited) );
logData->stopped = true;
self->id_data[id1] = logData;
Version ver = BinaryReader::fromStringRef<Version>( fVers.get()[idx].value, Unversioned() );
logData->persistentDataVersion = ver;
logData->persistentDataDurableVersion = ver;
logData->version.set(ver);
logData->recoveryCount = BinaryReader::fromStringRef<DBRecoveryCount>( fRecoverCounts.get()[idx].value, Unversioned() );
logData->removed = rejoinMasters(self, recruited, logData->recoveryCount, registerWithMaster.getFuture());
removed.push_back(errorOr(logData->removed));
TraceEvent("TLogRestorePersistentStateVer", id1).detail("Ver", ver);
// Restore popped keys. Pop operations that took place after the last (committed) updatePersistentDataVersion might be lost, but
// that is fine because we will get the corresponding data back, too.
tagKeys = prefixRange( rawId.withPrefix(persistTagPoppedKeys.begin) );
loop {
if(logData->removed.isReady()) break;
Standalone<VectorRef<KeyValueRef>> data = wait( self->persistentData->readRange( tagKeys, BUGGIFY ? 3 : 1<<30, 1<<20 ) );
if (!data.size()) break;
((KeyRangeRef&)tagKeys) = KeyRangeRef( keyAfter(data.back().key, tagKeys.arena()), tagKeys.end );
for(auto &kv : data) {
OldTag tag = decodeTagPoppedKey(rawId, kv.key);
Version popped = decodeTagPoppedValue(kv.value);
TraceEvent("TLogRestorePop", logData->logId).detail("Tag", tag).detail("To", popped);
ASSERT( logData->tag_data.find(tag) == logData->tag_data.end() );
logData->tag_data.insert( mapPair( tag, LogData::TagData( popped, false, false, tag )) );
}
}
}
state Future<Void> allRemoved = waitForAll(removed);
state Version lastVer = 0;
state UID lastId = UID(1,1); //initialized so it will not compare equal to a default UID
state double recoverMemoryLimit = SERVER_KNOBS->TARGET_BYTES_PER_TLOG + SERVER_KNOBS->SPRING_BYTES_TLOG;
if (BUGGIFY) recoverMemoryLimit = std::max<double>(SERVER_KNOBS->BUGGIFY_RECOVER_MEMORY_LIMIT, SERVER_KNOBS->TLOG_SPILL_THRESHOLD);
try {
loop {
if(allRemoved.isReady()) {
TEST(true); //all tlogs removed during queue recovery
throw worker_removed();
}
choose {
when( TLogQueueEntry qe = wait( self->persistentQueue->readNext() ) ) {
if(!self->queueOrder.size() || self->queueOrder.back() != qe.id) self->queueOrder.push_back(qe.id);
if(qe.id != lastId) {
lastId = qe.id;
auto it = self->id_data.find(qe.id);
if(it != self->id_data.end()) {
logData = it->second;
} else {
logData = Reference<LogData>();
}
} else {
ASSERT( qe.version >= lastVer );
lastVer = qe.version;
}
//TraceEvent("TLogRecoveredQE", self->dbgid).detail("LogId", qe.id).detail("Ver", qe.version).detail("MessageBytes", qe.messages.size()).detail("Tags", qe.tags.size())
// .detail("Tag0", qe.tags.size() ? qe.tags[0].tag : invalidTag).detail("Version", logData->version.get());
if(logData) {
logData->knownCommittedVersion = std::max(logData->knownCommittedVersion, qe.knownCommittedVersion);
if( qe.version > logData->version.get() ) {
commitMessages(logData, qe.version, qe.arena(), qe.messages, qe.tags, self->bytesInput);
logData->version.set( qe.version );
logData->queueCommittedVersion.set( qe.version );
while (self->bytesInput - self->bytesDurable >= recoverMemoryLimit) {
TEST(true); // Flush excess data during TLog queue recovery
TraceEvent("FlushLargeQueueDuringRecovery", self->dbgid).detail("BytesInput", self->bytesInput).detail("BytesDurable", self->bytesDurable).detail("Version", logData->version.get()).detail("PVer", logData->persistentDataVersion);
choose {
when( wait( updateStorage(self) ) ) {}
when( wait( allRemoved ) ) { throw worker_removed(); }
}
}
}
}
}
when( wait( allRemoved ) ) { throw worker_removed(); }
}
}
} catch (Error& e) {
if (e.code() != error_code_end_of_stream) throw;
}
TraceEvent("TLogRestorePersistentStateDone", self->dbgid).detail("Took", now()-startt);
TEST( now()-startt >= 1.0 ); // TLog recovery took more than 1 second
for(auto it : self->id_data) {
if(it.second->queueCommittedVersion.get() == 0) {
TraceEvent("TLogZeroVersion", self->dbgid).detail("LogId", it.first);
it.second->queueCommittedVersion.set(it.second->version.get());
}
self->sharedActors.send( tLogCore( self, it.second ) );
}
if(registerWithMaster.canBeSet()) registerWithMaster.send(Void());
return Void();
}
ACTOR Future<Void> tLog( IKeyValueStore* persistentData, IDiskQueue* persistentQueue, Reference<AsyncVar<ServerDBInfo>> db, LocalityData locality, UID tlogId )
{
state TLogData self( tlogId, persistentData, persistentQueue, db );
state Future<Void> error = actorCollection( self.sharedActors.getFuture() );
TraceEvent("SharedTlog", tlogId);
try {
wait( restorePersistentState( &self, locality ) );
self.sharedActors.send( cleanupPeekTrackers(&self) );
self.sharedActors.send( commitQueue(&self) );
self.sharedActors.send( updateStorageLoop(&self) );
wait( error );
throw internal_error();
} catch (Error& e) {
TraceEvent("TLogError", tlogId).error(e, true);
for( auto& it : self.id_data ) {
if(it.second->recoverySuccessful.canBeSet()) {
it.second->recoverySuccessful.send(false);
}
}
throw;
}
}
}
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