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arangodb/arangod/MMFiles/MMFilesCollectorThread.cpp

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////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Jan Steemann
////////////////////////////////////////////////////////////////////////////////
#include "MMFilesCollectorThread.h"
#include "Basics/ConditionLocker.h"
#include "Basics/Exceptions.h"
#include "Basics/MutexLocker.h"
#include "Basics/ReadLocker.h"
#include "Basics/VelocyPackHelper.h"
#include "Basics/encoding.h"
#include "Basics/hashes.h"
#include "Basics/memory-map.h"
#include "Logger/Logger.h"
#include "MMFiles/MMFilesCollection.h"
#include "MMFiles/MMFilesDatafileHelper.h"
#include "MMFiles/MMFilesLogfileManager.h"
#include "MMFiles/MMFilesIndexElement.h"
#include "MMFiles/MMFilesPersistentIndex.h"
#include "MMFiles/MMFilesPrimaryIndex.h"
#include "MMFiles/MMFilesWalLogfile.h"
#include "RestServer/TransactionManagerFeature.h"
#include "StorageEngine/EngineSelectorFeature.h"
#include "StorageEngine/StorageEngine.h"
#include "Transaction/Helpers.h"
#include "Utils/CollectionGuard.h"
#include "Utils/DatabaseGuard.h"
#include "Utils/SingleCollectionTransaction.h"
#include "Utils/StandaloneTransactionContext.h"
#include "Transaction/Hints.h"
#include "VocBase/CompactionLocker.h"
#include "VocBase/LogicalCollection.h"
using namespace arangodb;
/// @brief state that is built up when scanning a WAL logfile
struct CollectorState {
std::unordered_map<TRI_voc_cid_t, TRI_voc_tick_t> collections;
std::unordered_map<TRI_voc_cid_t, int64_t> operationsCount;
std::unordered_map<TRI_voc_cid_t, MMFilesOperationsType>
structuralOperations;
std::unordered_map<TRI_voc_cid_t, MMFilesDocumentOperationsType>
documentOperations;
std::unordered_set<TRI_voc_tid_t> failedTransactions;
std::unordered_set<TRI_voc_tid_t> handledTransactions;
std::unordered_set<TRI_voc_cid_t> droppedCollections;
std::unordered_set<TRI_voc_tick_t> droppedDatabases;
TRI_voc_tick_t lastDatabaseId;
TRI_voc_cid_t lastCollectionId;
CollectorState() : lastDatabaseId(0), lastCollectionId(0) {}
void resetCollection() {
return resetCollection(0, 0);
}
void resetCollection(TRI_voc_tick_t databaseId, TRI_voc_cid_t collectionId) {
lastDatabaseId = databaseId;
lastCollectionId = collectionId;
}
};
/// @brief whether or not a collection can be ignored in the gc
static bool ShouldIgnoreCollection(CollectorState const* state,
TRI_voc_cid_t cid) {
if (state->droppedCollections.find(cid) != state->droppedCollections.end()) {
// collection was dropped
return true;
}
// look up database id for collection
auto it = state->collections.find(cid);
if (it == state->collections.end()) {
// no database found for collection - should not happen normally
return true;
}
TRI_voc_tick_t databaseId = (*it).second;
if (state->droppedDatabases.find(databaseId) !=
state->droppedDatabases.end()) {
// database of the collection was already dropped
return true;
}
// collection not dropped, database not dropped
return false;
}
/// @brief callback to handle one marker during collection
static bool ScanMarker(TRI_df_marker_t const* marker, void* data,
MMFilesDatafile* datafile) {
CollectorState* state = static_cast<CollectorState*>(data);
TRI_ASSERT(marker != nullptr);
TRI_df_marker_type_t const type = marker->getType();
switch (type) {
case TRI_DF_MARKER_PROLOGUE: {
// simply note the last state
TRI_voc_tick_t const databaseId = MMFilesDatafileHelper::DatabaseId(marker);
TRI_voc_cid_t const collectionId = MMFilesDatafileHelper::CollectionId(marker);
state->resetCollection(databaseId, collectionId);
break;
}
case TRI_DF_MARKER_VPACK_DOCUMENT:
case TRI_DF_MARKER_VPACK_REMOVE: {
TRI_voc_tick_t const databaseId = state->lastDatabaseId;
TRI_voc_cid_t const collectionId = state->lastCollectionId;
TRI_ASSERT(databaseId > 0);
TRI_ASSERT(collectionId > 0);
TRI_voc_tid_t transactionId = MMFilesDatafileHelper::TransactionId(marker);
state->collections[collectionId] = databaseId;
if (state->failedTransactions.find(transactionId) !=
state->failedTransactions.end()) {
// transaction had failed
state->operationsCount[collectionId]++;
break;
}
if (ShouldIgnoreCollection(state, collectionId)) {
break;
}
VPackSlice slice(reinterpret_cast<char const*>(marker) + MMFilesDatafileHelper::VPackOffset(type));
state->documentOperations[collectionId][transaction::helpers::extractKeyFromDocument(slice).copyString()] = marker;
state->operationsCount[collectionId]++;
break;
}
case TRI_DF_MARKER_VPACK_BEGIN_TRANSACTION:
case TRI_DF_MARKER_VPACK_COMMIT_TRANSACTION: {
break;
}
case TRI_DF_MARKER_VPACK_ABORT_TRANSACTION: {
TRI_voc_tid_t const tid = MMFilesDatafileHelper::TransactionId(marker);
// note which abort markers we found
state->handledTransactions.emplace(tid);
break;
}
case TRI_DF_MARKER_VPACK_CREATE_COLLECTION: {
TRI_voc_cid_t const collectionId = MMFilesDatafileHelper::CollectionId(marker);
// note that the collection is now considered not dropped
state->droppedCollections.erase(collectionId);
break;
}
case TRI_DF_MARKER_VPACK_DROP_COLLECTION: {
TRI_voc_cid_t const collectionId = MMFilesDatafileHelper::CollectionId(marker);
// note that the collection was dropped and doesn't need to be collected
state->droppedCollections.emplace(collectionId);
state->structuralOperations.erase(collectionId);
state->documentOperations.erase(collectionId);
state->operationsCount.erase(collectionId);
state->collections.erase(collectionId);
break;
}
case TRI_DF_MARKER_VPACK_CREATE_DATABASE: {
TRI_voc_tick_t const database = MMFilesDatafileHelper::DatabaseId(marker);
// note that the database is now considered not dropped
state->droppedDatabases.erase(database);
break;
}
case TRI_DF_MARKER_VPACK_DROP_DATABASE: {
TRI_voc_tick_t const database = MMFilesDatafileHelper::DatabaseId(marker);
// note that the database was dropped and doesn't need to be collected
state->droppedDatabases.emplace(database);
// find all collections for the same database and erase their state, too
for (auto it = state->collections.begin(); it != state->collections.end();
/* no hoisting */) {
if ((*it).second == database) {
state->droppedCollections.emplace((*it).first);
state->structuralOperations.erase((*it).first);
state->documentOperations.erase((*it).first);
state->operationsCount.erase((*it).first);
it = state->collections.erase(it);
} else {
++it;
}
}
break;
}
case TRI_DF_MARKER_HEADER:
case TRI_DF_MARKER_FOOTER: {
// new datafile or end of datafile. forget state!
state->resetCollection();
break;
}
default: {
// do nothing intentionally
}
}
return true;
}
/// @brief wait interval for the collector thread when idle
uint64_t const MMFilesCollectorThread::Interval = 1000000;
/// @brief create the collector thread
MMFilesCollectorThread::MMFilesCollectorThread(MMFilesLogfileManager* logfileManager)
: Thread("WalCollector"),
_logfileManager(logfileManager),
_condition(),
_operationsQueueLock(),
_operationsQueue(),
_operationsQueueInUse(false),
_numPendingOperations(0),
_collectorResultCondition(),
_collectorResult(TRI_ERROR_NO_ERROR) {}
/// @brief wait for the collector result
int MMFilesCollectorThread::waitForResult(uint64_t timeout) {
CONDITION_LOCKER(guard, _collectorResultCondition);
if (_collectorResult == TRI_ERROR_NO_ERROR) {
if (!guard.wait(timeout)) {
return TRI_ERROR_LOCK_TIMEOUT;
}
}
return _collectorResult;
}
/// @brief begin shutdown sequence
void MMFilesCollectorThread::beginShutdown() {
Thread::beginShutdown();
// deactivate write-throttling on shutdown
_logfileManager->throttleWhenPending(0);
CONDITION_LOCKER(guard, _condition);
guard.signal();
}
/// @brief signal the thread that there is something to do
void MMFilesCollectorThread::signal() {
CONDITION_LOCKER(guard, _condition);
guard.signal();
}
/// @brief main loop
void MMFilesCollectorThread::run() {
int counter = 0;
while (true) {
bool hasWorked = false;
bool doDelay = false;
try {
// step 1: collect a logfile if any qualifies
if (!isStopping()) {
// don't collect additional logfiles in case we want to shut down
bool worked;
int res = this->collectLogfiles(worked);
if (res == TRI_ERROR_NO_ERROR) {
hasWorked |= worked;
} else if (res == TRI_ERROR_ARANGO_FILESYSTEM_FULL) {
doDelay = true;
}
}
// step 2: update master pointers
try {
bool worked;
int res = this->processQueuedOperations(worked);
if (res == TRI_ERROR_NO_ERROR) {
hasWorked |= worked;
} else if (res == TRI_ERROR_ARANGO_FILESYSTEM_FULL) {
doDelay = true;
}
} catch (...) {
// re-activate the queue
MUTEX_LOCKER(mutexLocker, _operationsQueueLock);
_operationsQueueInUse = false;
throw;
}
} catch (arangodb::basics::Exception const& ex) {
int res = ex.code();
LOG_TOPIC(ERR, Logger::COLLECTOR) << "got unexpected error in collectorThread::run: "
<< TRI_errno_string(res);
} catch (...) {
LOG_TOPIC(ERR, Logger::COLLECTOR) << "got unspecific error in collectorThread::run";
}
uint64_t interval = Interval;
if (doDelay) {
hasWorked = false;
// wait longer before retrying in case disk is full
interval *= 2;
}
CONDITION_LOCKER(guard, _condition);
if (!isStopping() && !hasWorked) {
// sleep only if there was nothing to do
if (!guard.wait(interval)) {
if (++counter > 10) {
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "wal collector has queued operations: "
<< numQueuedOperations();
counter = 0;
}
}
} else if (isStopping() && !hasQueuedOperations()) {
// no operations left to execute, we can exit
break;
}
}
// all queues are empty, so we can exit
TRI_ASSERT(!hasQueuedOperations());
}
/// @brief check whether there are queued operations left
bool MMFilesCollectorThread::hasQueuedOperations() {
MUTEX_LOCKER(mutexLocker, _operationsQueueLock);
return !_operationsQueue.empty();
}
/// @brief check whether there are queued operations left
bool MMFilesCollectorThread::hasQueuedOperations(TRI_voc_cid_t cid) {
MUTEX_LOCKER(mutexLocker, _operationsQueueLock);
return (_operationsQueue.find(cid) != _operationsQueue.end());
}
// execute a callback during a phase in which the collector has nothing
// queued. This is used in the DatabaseManagerThread when dropping
// a database to avoid existence of ditches of type DOCUMENT.
bool MMFilesCollectorThread::executeWhileNothingQueued(std::function<void()> const& cb) {
MUTEX_LOCKER(mutexLocker, _operationsQueueLock);
if (!_operationsQueue.empty()) {
return false;
}
cb();
return true;
}
/// @brief step 1: perform collection of a logfile (if any)
int MMFilesCollectorThread::collectLogfiles(bool& worked) {
// always init result variable
worked = false;
TRI_IF_FAILURE("CollectorThreadCollect") { return TRI_ERROR_NO_ERROR; }
MMFilesWalLogfile* logfile = _logfileManager->getCollectableLogfile();
if (logfile == nullptr) {
return TRI_ERROR_NO_ERROR;
}
worked = true;
_logfileManager->setCollectionRequested(logfile);
try {
int res = collect(logfile);
// LOG_TOPIC(TRACE, Logger::COLLECTOR) << "collected logfile: " << logfile->id() << ". result: " << res;
if (res == TRI_ERROR_NO_ERROR) {
// reset collector status
broadcastCollectorResult(res);
PersistentIndexFeature::syncWal();
_logfileManager->setCollectionDone(logfile);
} else {
// return the logfile to the logfile manager in case of errors
_logfileManager->forceStatus(logfile, MMFilesWalLogfile::StatusType::SEALED);
// set error in collector
broadcastCollectorResult(res);
}
return res;
} catch (arangodb::basics::Exception const& ex) {
_logfileManager->forceStatus(logfile, MMFilesWalLogfile::StatusType::SEALED);
int res = ex.code();
LOG_TOPIC(DEBUG, Logger::COLLECTOR) << "collecting logfile " << logfile->id()
<< " failed: " << TRI_errno_string(res);
return res;
} catch (...) {
_logfileManager->forceStatus(logfile, MMFilesWalLogfile::StatusType::SEALED);
LOG_TOPIC(DEBUG, Logger::COLLECTOR) << "collecting logfile " << logfile->id() << " failed";
return TRI_ERROR_INTERNAL;
}
}
/// @brief step 2: process all still-queued collection operations
int MMFilesCollectorThread::processQueuedOperations(bool& worked) {
// always init result variable
worked = false;
TRI_IF_FAILURE("CollectorThreadProcessQueuedOperations") {
return TRI_ERROR_NO_ERROR;
}
{
MUTEX_LOCKER(mutexLocker, _operationsQueueLock);
TRI_ASSERT(!_operationsQueueInUse);
if (_operationsQueue.empty()) {
// nothing to do
return TRI_ERROR_NO_ERROR;
}
// this flag indicates that no one else must write to the queue
_operationsQueueInUse = true;
}
// go on without the mutex!
// process operations for each collection
for (auto it = _operationsQueue.begin(); it != _operationsQueue.end(); ++it) {
auto& operations = (*it).second;
TRI_ASSERT(!operations.empty());
for (auto it2 = operations.begin(); it2 != operations.end();
/* no hoisting */) {
MMFilesWalLogfile* logfile = (*it2)->logfile;
int res = TRI_ERROR_INTERNAL;
try {
res = processCollectionOperations((*it2));
} catch (arangodb::basics::Exception const& ex) {
res = ex.code();
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "caught exception while applying queued operations: " << ex.what();
} catch (std::exception const& ex) {
res = TRI_ERROR_INTERNAL;
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "caught exception while applying queued operations: " << ex.what();
} catch (...) {
res = TRI_ERROR_INTERNAL;
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "caught unknown exception while applying queued operations";
}
if (res == TRI_ERROR_LOCK_TIMEOUT) {
// could not acquire write-lock for collection in time
// do not delete the operations
++it2;
continue;
}
if (res == TRI_ERROR_NO_ERROR) {
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "queued operations applied successfully";
} else if (res == TRI_ERROR_ARANGO_DATABASE_NOT_FOUND ||
res == TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND) {
// these are expected errors
LOG_TOPIC(TRACE, Logger::COLLECTOR)
<< "removing queued operations for already deleted collection";
res = TRI_ERROR_NO_ERROR;
} else {
LOG_TOPIC(WARN, Logger::COLLECTOR)
<< "got unexpected error code while applying queued operations: "
<< TRI_errno_string(res);
}
if (res == TRI_ERROR_NO_ERROR) {
uint64_t numOperations = (*it2)->operations->size();
uint64_t maxNumPendingOperations =
_logfileManager->throttleWhenPending();
if (maxNumPendingOperations > 0 &&
_numPendingOperations >= maxNumPendingOperations &&
(_numPendingOperations - numOperations) < maxNumPendingOperations) {
// write-throttling was active, but can be turned off now
_logfileManager->deactivateWriteThrottling();
LOG_TOPIC(INFO, Logger::COLLECTOR) << "deactivating write-throttling";
}
_numPendingOperations -= numOperations;
// delete the object
delete (*it2);
// delete the element from the vector while iterating over the vector
it2 = operations.erase(it2);
_logfileManager->decreaseCollectQueueSize(logfile);
} else {
// do not delete the object but advance in the operations vector
++it2;
}
}
// next collection
}
// finally remove all entries from the map with empty vectors
{
MUTEX_LOCKER(mutexLocker, _operationsQueueLock);
for (auto it = _operationsQueue.begin(); it != _operationsQueue.end();
/* no hoisting */) {
if ((*it).second.empty()) {
it = _operationsQueue.erase(it);
} else {
++it;
}
}
// the queue can now be used by others, too
_operationsQueueInUse = false;
}
worked = true;
return TRI_ERROR_NO_ERROR;
}
/// @brief return the number of queued operations
size_t MMFilesCollectorThread::numQueuedOperations() {
MUTEX_LOCKER(mutexLocker, _operationsQueueLock);
return _operationsQueue.size();
}
/// @brief process a single marker in collector step 2
void MMFilesCollectorThread::processCollectionMarker(
arangodb::SingleCollectionTransaction& trx,
LogicalCollection* collection, MMFilesCollectorCache* cache,
MMFilesCollectorOperation const& operation) {
auto const* walMarker = reinterpret_cast<TRI_df_marker_t const*>(operation.walPosition);
TRI_ASSERT(walMarker != nullptr);
TRI_ASSERT(reinterpret_cast<TRI_df_marker_t const*>(operation.datafilePosition));
TRI_voc_size_t const datafileMarkerSize = operation.datafileMarkerSize;
TRI_voc_fid_t const fid = operation.datafileId;
TRI_df_marker_type_t const type = walMarker->getType();
if (type == TRI_DF_MARKER_VPACK_DOCUMENT) {
auto& dfi = cache->createDfi(fid);
dfi.numberUncollected--;
VPackSlice slice(reinterpret_cast<char const*>(walMarker) + MMFilesDatafileHelper::VPackOffset(type));
TRI_ASSERT(slice.isObject());
VPackSlice keySlice;
TRI_voc_rid_t revisionId = 0;
transaction::helpers::extractKeyAndRevFromDocument(slice, keySlice, revisionId);
bool wasAdjusted = false;
MMFilesSimpleIndexElement element = collection->primaryIndex()->lookupKey(&trx, keySlice);
if (element &&
element.revisionId() == revisionId) {
// make it point to datafile now
TRI_df_marker_t const* newPosition = reinterpret_cast<TRI_df_marker_t const*>(operation.datafilePosition);
wasAdjusted = collection->updateRevisionConditional(element.revisionId(), walMarker, newPosition, fid, false);
}
if (wasAdjusted) {
// revision is still active
dfi.numberAlive++;
dfi.sizeAlive += encoding::alignedSize<int64_t>(datafileMarkerSize);
} else {
// somebody inserted a new revision of the document or the revision
// was already moved by the compactor
dfi.numberDead++;
dfi.sizeDead += encoding::alignedSize<int64_t>(datafileMarkerSize);
}
} else if (type == TRI_DF_MARKER_VPACK_REMOVE) {
auto& dfi = cache->createDfi(fid);
dfi.numberUncollected--;
dfi.numberDeletions++;
VPackSlice slice(reinterpret_cast<char const*>(walMarker) + MMFilesDatafileHelper::VPackOffset(type));
TRI_ASSERT(slice.isObject());
VPackSlice keySlice;
TRI_voc_rid_t revisionId = 0;
transaction::helpers::extractKeyAndRevFromDocument(slice, keySlice, revisionId);
MMFilesSimpleIndexElement found = collection->primaryIndex()->lookupKey(&trx, keySlice);
if (found &&
found.revisionId() > revisionId) {
// somebody re-created the document with a newer revision
dfi.numberDead++;
dfi.sizeDead += encoding::alignedSize<int64_t>(datafileMarkerSize);
}
}
}
/// @brief process all operations for a single collection
int MMFilesCollectorThread::processCollectionOperations(MMFilesCollectorCache* cache) {
arangodb::DatabaseGuard dbGuard(cache->databaseId);
TRI_vocbase_t* vocbase = dbGuard.database();
TRI_ASSERT(vocbase != nullptr);
arangodb::CollectionGuard collectionGuard(vocbase, cache->collectionId, true);
arangodb::LogicalCollection* collection = collectionGuard.collection();
TRI_ASSERT(collection != nullptr);
// first try to read-lock the compactor-lock, afterwards try to write-lock the
// collection
// if any locking attempt fails, release and try again next time
TryCompactionPreventer compactionPreventer(logicalToMMFiles(collection));
if (!compactionPreventer.isLocked()) {
return TRI_ERROR_LOCK_TIMEOUT;
}
arangodb::SingleCollectionTransaction trx(
arangodb::StandaloneTransactionContext::Create(collection->vocbase()),
collection->cid(), AccessMode::Type::WRITE);
trx.addHint(transaction::Hints::Hint::NO_USAGE_LOCK); // already locked by guard above
trx.addHint(transaction::Hints::Hint::NO_COMPACTION_LOCK); // already locked above
trx.addHint(transaction::Hints::Hint::NO_THROTTLING);
trx.addHint(transaction::Hints::Hint::NO_BEGIN_MARKER);
trx.addHint(transaction::Hints::Hint::NO_ABORT_MARKER);
trx.addHint(transaction::Hints::Hint::TRY_LOCK);
int res = trx.begin();
if (res != TRI_ERROR_NO_ERROR) {
// this includes TRI_ERROR_LOCK_TIMEOUT!
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "wal collector couldn't acquire write lock for collection '"
<< collection->name() << "': " << TRI_errno_string(res);
return res;
}
try {
// now we have the write lock on the collection
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "wal collector processing operations for collection '"
<< collection->name() << "'";
TRI_ASSERT(!cache->operations->empty());
for (auto const& it : *(cache->operations)) {
processCollectionMarker(trx, collection, cache, it);
}
// finally update all datafile statistics
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "updating datafile statistics for collection '"
<< collection->name() << "'";
updateDatafileStatistics(collection, cache);
static_cast<arangodb::MMFilesCollection*>(collection->getPhysical())->decreaseUncollectedLogfileEntries(cache->totalOperationsCount);
res = TRI_ERROR_NO_ERROR;
} catch (arangodb::basics::Exception const& ex) {
res = ex.code();
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "wal collector caught exception: " << ex.what();
} catch (std::exception const& ex) {
res = TRI_ERROR_INTERNAL;
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "wal collector caught exception: " << ex.what();
} catch (...) {
res = TRI_ERROR_INTERNAL;
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "wal collector caught unknown exception";
}
// always release the locks
trx.finish(res);
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "wal collector processed operations for collection '"
<< collection->name() << "' with status: " << TRI_errno_string(res);
return res;
}
/// @brief collect one logfile
int MMFilesCollectorThread::collect(MMFilesWalLogfile* logfile) {
TRI_ASSERT(logfile != nullptr);
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "collecting logfile " << logfile->id();
MMFilesDatafile* df = logfile->df();
TRI_ASSERT(df != nullptr);
TRI_IF_FAILURE("CollectorThreadCollectException") {
THROW_ARANGO_EXCEPTION(TRI_ERROR_DEBUG);
}
// We will sequentially scan the logfile for collection:
df->sequentialAccess();
df->willNeed();
TRI_DEFER(df->randomAccess());
// create a state for the collector, beginning with the list of failed
// transactions
CollectorState state;
state.failedTransactions = TransactionManagerFeature::MANAGER->getFailedTransactions();
/*
if (_inRecovery) {
state.droppedCollections = _logfileManager->getDroppedCollections();
state.droppedDatabases = _logfileManager->getDroppedDatabases();
}
*/
// scan all markers in logfile, this will fill the state
bool result =
TRI_IterateDatafile(df, &ScanMarker, static_cast<void*>(&state));
if (!result) {
return TRI_ERROR_INTERNAL;
}
// get an aggregated list of all collection ids
std::set<TRI_voc_cid_t> collectionIds;
for (auto it = state.structuralOperations.begin();
it != state.structuralOperations.end(); ++it) {
auto cid = (*it).first;
if (!ShouldIgnoreCollection(&state, cid)) {
collectionIds.emplace((*it).first);
}
}
for (auto it = state.documentOperations.begin();
it != state.documentOperations.end(); ++it) {
auto cid = (*it).first;
if (state.structuralOperations.find(cid) ==
state.structuralOperations.end() &&
!ShouldIgnoreCollection(&state, cid)) {
collectionIds.emplace(cid);
}
}
MMFilesOperationsType sortedOperations;
// now for each collection, write all surviving markers into collection
// datafiles
for (auto it = collectionIds.begin(); it != collectionIds.end(); ++it) {
auto cid = (*it);
// calculate required size for sortedOperations vector
sortedOperations.clear();
{
size_t requiredSize = 0;
auto it1 = state.structuralOperations.find(cid);
if (it1 != state.structuralOperations.end()) {
requiredSize += (*it1).second.size();
}
auto it2 = state.documentOperations.find(cid);
if (it2 != state.documentOperations.end()) {
requiredSize += (*it2).second.size();
}
sortedOperations.reserve(requiredSize);
}
// insert structural operations - those are already sorted by tick
if (state.structuralOperations.find(cid) !=
state.structuralOperations.end()) {
MMFilesOperationsType const& ops = state.structuralOperations[cid];
sortedOperations.insert(sortedOperations.begin(), ops.begin(), ops.end());
TRI_ASSERT(sortedOperations.size() == ops.size());
}
// insert document operations - those are sorted by key, not by tick
if (state.documentOperations.find(cid) != state.documentOperations.end()) {
MMFilesDocumentOperationsType const& ops = state.documentOperations[cid];
for (auto it2 = ops.begin(); it2 != ops.end(); ++it2) {
sortedOperations.push_back((*it2).second);
}
// sort vector by marker tick
std::sort(sortedOperations.begin(), sortedOperations.end(),
[](TRI_df_marker_t const* left, TRI_df_marker_t const* right) {
return (left->getTick() < right->getTick());
});
}
if (!sortedOperations.empty()) {
int res = TRI_ERROR_INTERNAL;
try {
res = transferMarkers(logfile, cid, state.collections[cid],
state.operationsCount[cid], sortedOperations);
TRI_IF_FAILURE("failDuringCollect") {
THROW_ARANGO_EXCEPTION(TRI_ERROR_DEBUG);
}
} catch (arangodb::basics::Exception const& ex) {
res = ex.code();
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "caught exception in collect: " << ex.what();
} catch (std::exception const& ex) {
res = TRI_ERROR_INTERNAL;
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "caught exception in collect: " << ex.what();
} catch (...) {
res = TRI_ERROR_INTERNAL;
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "caught unknown exception in collect";
}
if (res != TRI_ERROR_NO_ERROR &&
res != TRI_ERROR_ARANGO_DATABASE_NOT_FOUND &&
res != TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND) {
if (res != TRI_ERROR_ARANGO_FILESYSTEM_FULL) {
// other places already log this error, and making the logging
// conditional here
// prevents the log message from being shown over and over again in
// case the
// file system is full
LOG_TOPIC(WARN, Logger::COLLECTOR) << "got unexpected error in MMFilesCollectorThread::collect: "
<< TRI_errno_string(res);
}
// abort early
return res;
}
}
}
// Error conditions TRI_ERROR_ARANGO_DATABASE_NOT_FOUND and
// TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND are intentionally ignored
// here since this can actually happen if someone has dropped things
// in between.
// remove all handled transactions from failedTransactions list
if (!state.handledTransactions.empty()) {
TransactionManagerFeature::MANAGER->unregisterFailedTransactions(state.handledTransactions);
}
return TRI_ERROR_NO_ERROR;
}
/// @brief transfer markers into a collection
int MMFilesCollectorThread::transferMarkers(MMFilesWalLogfile* logfile,
TRI_voc_cid_t collectionId,
TRI_voc_tick_t databaseId,
int64_t totalOperationsCount,
MMFilesOperationsType const& operations) {
TRI_ASSERT(!operations.empty());
// prepare database and collection
arangodb::DatabaseGuard dbGuard(databaseId);
TRI_vocbase_t* vocbase = dbGuard.database();
TRI_ASSERT(vocbase != nullptr);
arangodb::CollectionGuard collectionGuard(vocbase, collectionId, true);
arangodb::LogicalCollection* collection = collectionGuard.collection();
TRI_ASSERT(collection != nullptr);
// no need to go on if the collection is already deleted
if (collection->status() == TRI_VOC_COL_STATUS_DELETED) {
return TRI_ERROR_NO_ERROR;
}
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "collector transferring markers for '"
<< collection->name()
<< "', totalOperationsCount: " << totalOperationsCount;
auto cache = std::make_unique<MMFilesCollectorCache>(collectionId, databaseId, logfile,
totalOperationsCount, operations.size());
StorageEngine* engine = EngineSelectorFeature::ENGINE;
int res = TRI_ERROR_INTERNAL;
try {
res = engine->transferMarkers(collection, cache.get(), operations);
if (res == TRI_ERROR_NO_ERROR && !cache->operations->empty()) {
queueOperations(logfile, cache);
}
} catch (arangodb::basics::Exception const& ex) {
res = ex.code();
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "caught exception in transferMarkers: " << ex.what();
} catch (std::exception const& ex) {
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "caught exception in transferMarkers: " << ex.what();
res = TRI_ERROR_INTERNAL;
} catch (...) {
res = TRI_ERROR_INTERNAL;
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "caught unknown exception in transferMarkers";
}
return res;
}
/// @brief insert the collect operations into a per-collection queue
int MMFilesCollectorThread::queueOperations(arangodb::MMFilesWalLogfile* logfile,
std::unique_ptr<MMFilesCollectorCache>& cache) {
TRI_ASSERT(cache != nullptr);
TRI_voc_cid_t cid = cache->collectionId;
uint64_t numOperations = cache->operations->size();
uint64_t maxNumPendingOperations = _logfileManager->throttleWhenPending();
TRI_ASSERT(!cache->operations->empty());
while (true) {
{
MUTEX_LOCKER(mutexLocker, _operationsQueueLock);
if (!_operationsQueueInUse) {
// it is only safe to access the queue if this flag is not set
auto it = _operationsQueue.find(cid);
if (it == _operationsQueue.end()) {
_operationsQueue.emplace(cid, std::vector<MMFilesCollectorCache*>({cache.get()}));
_logfileManager->increaseCollectQueueSize(logfile);
} else {
(*it).second.push_back(cache.get());
_logfileManager->increaseCollectQueueSize(logfile);
}
// now _operationsQueue is responsible for managing the cache entry
cache.release();
// exit the loop
break;
}
}
// wait outside the mutex for the flag to be cleared
usleep(10000);
}
if (maxNumPendingOperations > 0 &&
_numPendingOperations < maxNumPendingOperations &&
(_numPendingOperations + numOperations) >= maxNumPendingOperations &&
!isStopping()) {
// activate write-throttling!
_logfileManager->activateWriteThrottling();
LOG_TOPIC(WARN, Logger::COLLECTOR)
<< "queued more than " << maxNumPendingOperations
<< " pending WAL collector operations."
<< " current queue size: " << (_numPendingOperations + numOperations)
<< ". now activating write-throttling";
}
_numPendingOperations += numOperations;
return TRI_ERROR_NO_ERROR;
}
/// @brief update a collection's datafile information
int MMFilesCollectorThread::updateDatafileStatistics(
LogicalCollection* collection, MMFilesCollectorCache* cache) {
// iterate over all datafile infos and update the collection's datafile stats
for (auto it = cache->dfi.begin(); it != cache->dfi.end();
/* no hoisting */) {
collection->updateStats((*it).first, (*it).second);
// flush the local datafile info so we don't update the statistics twice
// with the same values
(*it).second.reset();
it = cache->dfi.erase(it);
}
return TRI_ERROR_NO_ERROR;
}
void MMFilesCollectorThread::broadcastCollectorResult(int res) {
CONDITION_LOCKER(guard, _collectorResultCondition);
_collectorResult = res;
_collectorResultCondition.broadcast();
}
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