Hawkin
/
arangodb
mirror of https://gitee.com/bigwinds/arangodb
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
arangodb/arangod/StorageEngine/MMFilesCollection.cpp

771 lines
22 KiB
C++
Raw Blame History

////////////////////////////////////////////////////////////////////////////////
/// 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 "MMFilesCollection.h"
#include "Basics/FileUtils.h"
#include "Basics/ReadLocker.h"
#include "Basics/WriteLocker.h"
#include "Basics/memory-map.h"
#include "Logger/Logger.h"
#include "VocBase/DatafileHelper.h"
#include "VocBase/LogicalCollection.h"
#include "VocBase/collection.h"
#include "VocBase/datafile.h"
using namespace arangodb;
namespace {
/// @brief ensures that an error code is set in all required places
static void EnsureErrorCode(int code) {
if (code == TRI_ERROR_NO_ERROR) {
// must have an error code
code = TRI_ERROR_INTERNAL;
}
TRI_set_errno(code);
errno = code;
}
}
MMFilesCollection::MMFilesCollection(LogicalCollection* collection)
: PhysicalCollection(collection) {}
MMFilesCollection::~MMFilesCollection() {
close();
for (auto& it : _datafiles) {
TRI_FreeDatafile(it);
}
for (auto& it : _journals) {
TRI_FreeDatafile(it);
}
for (auto& it : _compactors) {
TRI_FreeDatafile(it);
}
}
TRI_voc_rid_t MMFilesCollection::revision() const {
return 0;
}
void MMFilesCollection::setRevision(TRI_voc_rid_t revision, bool force) {
}
int64_t MMFilesCollection::initialCount() const {
return 0;
}
/// @brief closes an open collection
int MMFilesCollection::close() {
// close compactor files
closeDatafiles(_compactors);
_compactors.clear();
// close journal files
closeDatafiles(_journals);
_journals.clear();
// close datafiles
closeDatafiles(_datafiles);
_datafiles.clear();
return TRI_ERROR_NO_ERROR;
}
/// @brief seal a datafile
int MMFilesCollection::sealDatafile(TRI_datafile_t* datafile, bool isCompactor) {
int res = TRI_SealDatafile(datafile);
if (res != TRI_ERROR_NO_ERROR) {
LOG(ERR) << "failed to seal journal '" << datafile->getName(datafile)
<< "': " << TRI_errno_string(res);
return res;
}
if (!isCompactor && datafile->isPhysical(datafile)) {
// rename the file
std::string dname("datafile-" + std::to_string(datafile->_fid) + ".db");
std::string filename = arangodb::basics::FileUtils::buildFilename(_logicalCollection->path(), dname);
res = TRI_RenameDatafile(datafile, filename.c_str());
if (res == TRI_ERROR_NO_ERROR) {
LOG(TRACE) << "closed file '" << datafile->getName(datafile) << "'";
} else {
LOG(ERR) << "failed to rename datafile '" << datafile->getName(datafile)
<< "' to '" << filename << "': " << TRI_errno_string(res);
}
}
return res;
}
/// @brief rotate the active journal - will do nothing if there is no journal
int MMFilesCollection::rotateActiveJournal() {
WRITE_LOCKER(writeLocker, _filesLock);
// note: only journals need to be handled here as the journal is the
// only place that's ever written to. if a journal is full, it will have been
// sealed and synced already
if (_journals.empty()) {
return TRI_ERROR_ARANGO_NO_JOURNAL;
}
TRI_datafile_t* datafile = _journals[0];
TRI_ASSERT(datafile != nullptr);
// make sure we have enough room in the target vector before we go on
_datafiles.reserve(_datafiles.size() + 1);
int res = sealDatafile(datafile, false);
if (res != TRI_ERROR_NO_ERROR) {
return res;
}
// shouldn't throw as we reserved enough space before
_datafiles.emplace_back(datafile);
TRI_ASSERT(!_journals.empty());
_journals.erase(_journals.begin());
TRI_ASSERT(_journals.empty());
return res;
}
/// @brief sync the active journal - will do nothing if there is no journal
/// or if the journal is volatile
int MMFilesCollection::syncActiveJournal() {
WRITE_LOCKER(writeLocker, _filesLock);
// note: only journals need to be handled here as the journal is the
// only place that's ever written to. if a journal is full, it will have been
// sealed and synced already
if (_journals.empty()) {
// nothing to do
return TRI_ERROR_NO_ERROR;
}
TRI_datafile_t* datafile = _journals[0];
TRI_ASSERT(datafile != nullptr);
int res = TRI_ERROR_NO_ERROR;
// we only need to care about physical datafiles
// anonymous regions do not need to be synced
if (datafile->isPhysical(datafile)) {
char const* synced = datafile->_synced;
char* written = datafile->_written;
if (synced < written) {
bool ok = datafile->sync(datafile, synced, written);
if (ok) {
LOG_TOPIC(TRACE, Logger::COLLECTOR) << "msync succeeded "
<< (void*)synced << ", size "
<< (written - synced);
datafile->_synced = written;
} else {
res = TRI_errno();
if (res == TRI_ERROR_NO_ERROR) {
// oops, error code got lost
res = TRI_ERROR_INTERNAL;
}
LOG_TOPIC(ERR, Logger::COLLECTOR)
<< "msync failed with: " << TRI_last_error();
datafile->_state = TRI_DF_STATE_WRITE_ERROR;
}
}
}
return res;
}
/// @brief reserve space in the current journal. if no create exists or the
/// current journal cannot provide enough space, close the old journal and
/// create a new one
int MMFilesCollection::reserveJournalSpace(TRI_voc_tick_t tick,
TRI_voc_size_t size,
char*& resultPosition,
TRI_datafile_t*& resultDatafile) {
// reset results
resultPosition = nullptr;
resultDatafile = nullptr;
WRITE_LOCKER(writeLocker, _filesLock);
// start with configured journal size
TRI_voc_size_t targetSize = static_cast<TRI_voc_size_t>(_logicalCollection->journalSize());
// make sure that the document fits
while (targetSize - 256 < size) {
targetSize *= 2;
}
while (true) {
TRI_datafile_t* datafile = nullptr;
if (_journals.empty()) {
// create enough room in the journals vector
_journals.reserve(_journals.size() + 1);
datafile = createDatafile(tick, targetSize, false);
if (datafile == nullptr) {
int res = TRI_errno();
// could not create a datafile, this is a serious error
if (res == TRI_ERROR_NO_ERROR) {
// oops, error code got lost
res = TRI_ERROR_INTERNAL;
}
return res;
}
// shouldn't throw as we reserved enough space before
_journals.emplace_back(datafile);
} else {
// select datafile
datafile = _journals[0];
}
TRI_ASSERT(datafile != nullptr);
// try to reserve space in the datafile
TRI_df_marker_t* position = nullptr;
int res = TRI_ReserveElementDatafile(datafile, size, &position, targetSize);
// found a datafile with enough space left
if (res == TRI_ERROR_NO_ERROR) {
datafile->_written = ((char*)position) + size;
// set result
resultPosition = reinterpret_cast<char*>(position);
resultDatafile = datafile;
return TRI_ERROR_NO_ERROR;
}
if (res != TRI_ERROR_ARANGO_DATAFILE_FULL) {
// some other error
LOG_TOPIC(ERR, Logger::COLLECTOR) << "cannot select journal: '"
<< TRI_last_error() << "'";
return res;
}
// TRI_ERROR_ARANGO_DATAFILE_FULL...
// journal is full, close it and sync
LOG_TOPIC(DEBUG, Logger::COLLECTOR) << "closing full journal '"
<< datafile->getName(datafile) << "'";
// make sure we have enough room in the target vector before we go on
_datafiles.reserve(_datafiles.size() + 1);
res = sealDatafile(datafile, false);
// move journal into datafiles vector, regardless of whether an error
// occurred
TRI_ASSERT(!_journals.empty());
_journals.erase(_journals.begin());
TRI_ASSERT(_journals.empty());
// this shouldn't fail, as we have reserved space before already
_datafiles.emplace_back(datafile);
if (res != TRI_ERROR_NO_ERROR) {
// an error occurred, we must stop here
return res;
}
} // otherwise, next iteration!
return TRI_ERROR_ARANGO_NO_JOURNAL;
}
/// @brief create compactor file
TRI_datafile_t* MMFilesCollection::createCompactor(TRI_voc_fid_t fid,
TRI_voc_size_t maximalSize) {
try {
WRITE_LOCKER(writeLocker, _filesLock);
TRI_ASSERT(_compactors.empty());
// reserve enough space for the later addition
_compactors.reserve(_compactors.size() + 1);
TRI_datafile_t* compactor =
createDatafile(fid, static_cast<TRI_voc_size_t>(maximalSize), true);
if (compactor != nullptr) {
// should not throw, as we've reserved enough space before
_compactors.emplace_back(compactor);
}
return compactor;
} catch (...) {
return nullptr;
}
}
/// @brief close an existing compactor
int MMFilesCollection::closeCompactor(TRI_datafile_t* datafile) {
WRITE_LOCKER(writeLocker, _filesLock);
if (_compactors.size() != 1) {
return TRI_ERROR_ARANGO_NO_JOURNAL;
}
TRI_datafile_t* compactor = _compactors[0];
if (datafile != compactor) {
// wrong compactor file specified... should not happen
return TRI_ERROR_INTERNAL;
}
return sealDatafile(datafile, true);
}
/// @brief replace a datafile with a compactor
int MMFilesCollection::replaceDatafileWithCompactor(TRI_datafile_t* datafile,
TRI_datafile_t* compactor) {
TRI_ASSERT(datafile != nullptr);
TRI_ASSERT(compactor != nullptr);
WRITE_LOCKER(writeLocker, _filesLock);
TRI_ASSERT(!_compactors.empty());
for (size_t i = 0; i < _datafiles.size(); ++i) {
if (_datafiles[i]->_fid == datafile->_fid) {
// found!
// now put the compactor in place of the datafile
_datafiles[i] = compactor;
// remove the compactor file from the list of compactors
TRI_ASSERT(_compactors[0] != nullptr);
TRI_ASSERT(_compactors[0]->_fid == compactor->_fid);
_compactors.erase(_compactors.begin());
TRI_ASSERT(_compactors.empty());
return TRI_ERROR_NO_ERROR;
}
}
return TRI_ERROR_INTERNAL;
}
/// @brief creates a datafile
TRI_datafile_t* MMFilesCollection::createDatafile(TRI_voc_fid_t fid,
TRI_voc_size_t journalSize,
bool isCompactor) {
TRI_ASSERT(fid > 0);
// create an entry for the new datafile
try {
_logicalCollection->_collection->_datafileStatistics.create(fid);
} catch (...) {
EnsureErrorCode(TRI_ERROR_OUT_OF_MEMORY);
return nullptr;
}
TRI_datafile_t* datafile;
if (_logicalCollection->isVolatile()) {
// in-memory collection
datafile = TRI_CreateDatafile(nullptr, fid, journalSize, true);
} else {
// construct a suitable filename (which may be temporary at the beginning)
std::string jname;
if (isCompactor) {
jname = "compaction-";
} else {
jname = "temp-";
}
jname.append(std::to_string(fid) + ".db");
std::string filename = arangodb::basics::FileUtils::buildFilename(_logicalCollection->path(), jname);
TRI_IF_FAILURE("CreateJournalDocumentCollection") {
// simulate disk full
EnsureErrorCode(TRI_ERROR_ARANGO_FILESYSTEM_FULL);
return nullptr;
}
// remove an existing temporary file first
if (TRI_ExistsFile(filename.c_str())) {
// remove an existing file first
TRI_UnlinkFile(filename.c_str());
}
datafile = TRI_CreateDatafile(filename.c_str(), fid, journalSize, true);
}
if (datafile == nullptr) {
if (TRI_errno() == TRI_ERROR_OUT_OF_MEMORY_MMAP) {
EnsureErrorCode(TRI_ERROR_OUT_OF_MEMORY_MMAP);
} else {
EnsureErrorCode(TRI_ERROR_ARANGO_NO_JOURNAL);
}
return nullptr;
}
// datafile is there now
TRI_ASSERT(datafile != nullptr);
if (isCompactor) {
LOG(TRACE) << "created new compactor '" << datafile->getName(datafile)
<< "'";
} else {
LOG(TRACE) << "created new journal '" << datafile->getName(datafile) << "'";
}
// create a collection header, still in the temporary file
TRI_df_marker_t* position;
int res = TRI_ReserveElementDatafile(
datafile, sizeof(TRI_col_header_marker_t), &position, journalSize);
TRI_IF_FAILURE("CreateJournalDocumentCollectionReserve1") {
res = TRI_ERROR_DEBUG;
}
if (res != TRI_ERROR_NO_ERROR) {
LOG(ERR) << "cannot create collection header in file '"
<< datafile->getName(datafile) << "': " << TRI_errno_string(res);
// close the journal and remove it
TRI_CloseDatafile(datafile);
TRI_UnlinkFile(datafile->getName(datafile));
TRI_FreeDatafile(datafile);
EnsureErrorCode(res);
return nullptr;
}
TRI_col_header_marker_t cm;
DatafileHelper::InitMarker(
reinterpret_cast<TRI_df_marker_t*>(&cm), TRI_DF_MARKER_COL_HEADER,
sizeof(TRI_col_header_marker_t), static_cast<TRI_voc_tick_t>(fid));
cm._cid = _logicalCollection->cid();
res = TRI_WriteCrcElementDatafile(datafile, position, &cm.base, false);
TRI_IF_FAILURE("CreateJournalDocumentCollectionReserve2") {
res = TRI_ERROR_DEBUG;
}
if (res != TRI_ERROR_NO_ERROR) {
int res = datafile->_lastError;
LOG(ERR) << "cannot create collection header in file '"
<< datafile->getName(datafile) << "': " << TRI_last_error();
// close the datafile and remove it
TRI_CloseDatafile(datafile);
TRI_UnlinkFile(datafile->getName(datafile));
TRI_FreeDatafile(datafile);
EnsureErrorCode(res);
return nullptr;
}
TRI_ASSERT(fid == datafile->_fid);
// if a physical file, we can rename it from the temporary name to the correct
// name
if (!isCompactor && datafile->isPhysical(datafile)) {
// and use the correct name
std::string jname("journal-" + std::to_string(datafile->_fid) + ".db");
std::string filename = arangodb::basics::FileUtils::buildFilename(_logicalCollection->path(), jname);
int res = TRI_RenameDatafile(datafile, filename.c_str());
if (res != TRI_ERROR_NO_ERROR) {
LOG(ERR) << "failed to rename journal '" << datafile->getName(datafile)
<< "' to '" << filename << "': " << TRI_errno_string(res);
TRI_CloseDatafile(datafile);
TRI_UnlinkFile(datafile->getName(datafile));
TRI_FreeDatafile(datafile);
EnsureErrorCode(res);
return nullptr;
}
LOG(TRACE) << "renamed journal from '" << datafile->getName(datafile)
<< "' to '" << filename << "'";
}
return datafile;
}
/// @brief remove a compactor file from the list of compactors
bool MMFilesCollection::removeCompactor(TRI_datafile_t* df) {
WRITE_LOCKER(writeLocker, _filesLock);
for (auto it = _compactors.begin(); it != _compactors.end(); ++it) {
if ((*it) == df) {
// and finally remove the file from the _compactors vector
_compactors.erase(it);
return true;
}
}
// not found
return false;
}
/// @brief remove a datafile from the list of datafiles
bool MMFilesCollection::removeDatafile(TRI_datafile_t* df) {
WRITE_LOCKER(writeLocker, _filesLock);
for (auto it = _datafiles.begin(); it != _datafiles.end(); ++it) {
if ((*it) == df) {
// and finally remove the file from the _compactors vector
_datafiles.erase(it);
return true;
}
}
// not found
return false;
}
/// @brief iterates over a collection
bool MMFilesCollection::iterateDatafiles(std::function<bool(TRI_df_marker_t const*, TRI_datafile_t*)> const& cb) {
if (!iterateDatafilesVector(_datafiles, cb) ||
!iterateDatafilesVector(_compactors, cb) ||
!iterateDatafilesVector(_journals, cb)) {
return false;
}
return true;
}
/// @brief iterate over all datafiles in a vector
bool MMFilesCollection::iterateDatafilesVector(std::vector<TRI_datafile_t*> const& files,
std::function<bool(TRI_df_marker_t const*, TRI_datafile_t*)> const& cb) {
for (auto const& datafile : files) {
if (!TRI_IterateDatafile(datafile, cb)) {
return false;
}
if (datafile->isPhysical(datafile) && datafile->_isSealed) {
TRI_MMFileAdvise(datafile->_data, datafile->_maximalSize,
TRI_MADVISE_RANDOM);
}
}
return true;
}
/// @brief closes the datafiles passed in the vector
bool MMFilesCollection::closeDatafiles(std::vector<TRI_datafile_t*> const& files) {
bool result = true;
for (auto const& datafile : files) {
TRI_ASSERT(datafile != nullptr);
if (datafile->_state == TRI_DF_STATE_CLOSED) {
continue;
}
int res = TRI_CloseDatafile(datafile);
if (res != TRI_ERROR_NO_ERROR) {
result = false;
}
}
return result;
}
void MMFilesCollection::figures(std::shared_ptr<arangodb::velocypack::Builder>& builder) {
READ_LOCKER(readLocker, _filesLock);
size_t sizeDatafiles = 0;
builder->add("datafiles", VPackValue(VPackValueType::Object));
for (auto const& it : _datafiles) {
sizeDatafiles += it->_initSize;
}
builder->add("count", VPackValue(_datafiles.size()));
builder->add("fileSize", VPackValue(sizeDatafiles));
builder->close(); // datafiles
size_t sizeJournals = 0;
for (auto const& it : _journals) {
sizeJournals += it->_initSize;
}
builder->add("journals", VPackValue(VPackValueType::Object));
builder->add("count", VPackValue(_journals.size()));
builder->add("fileSize", VPackValue(sizeJournals));
builder->close(); // journals
size_t sizeCompactors = 0;
for (auto const& it : _compactors) {
sizeCompactors += it->_initSize;
}
builder->add("compactors", VPackValue(VPackValueType::Object));
builder->add("count", VPackValue(_compactors.size()));
builder->add("fileSize", VPackValue(sizeCompactors));
builder->close(); // compactors
}
/// @brief iterate over a vector of datafiles and pick those with a specific
/// data range
std::vector<DatafileDescription> MMFilesCollection::datafilesInRange(TRI_voc_tick_t dataMin, TRI_voc_tick_t dataMax) {
std::vector<DatafileDescription> result;
auto apply = [&dataMin, &dataMax, &result](TRI_datafile_t const* datafile, bool isJournal) {
DatafileDescription entry = {datafile, datafile->_dataMin, datafile->_dataMax, datafile->_tickMax, isJournal};
LOG(TRACE) << "checking datafile " << datafile->_fid << " with data range " << datafile->_dataMin << " - " << datafile->_dataMax << ", tick max: " << datafile->_tickMax;
if (datafile->_dataMin == 0 || datafile->_dataMax == 0) {
// datafile doesn't have any data
return;
}
TRI_ASSERT(datafile->_tickMin <= datafile->_tickMax);
TRI_ASSERT(datafile->_dataMin <= datafile->_dataMax);
if (dataMax < datafile->_dataMin) {
// datafile is newer than requested range
return;
}
if (dataMin > datafile->_dataMax) {
// datafile is older than requested range
return;
}
result.emplace_back(entry);
};
READ_LOCKER(readLocker, _filesLock);
for (auto& it : _datafiles) {
apply(it, false);
}
for (auto& it : _journals) {
apply(it, true);
}
return result;
}
int MMFilesCollection::applyForTickRange(TRI_voc_tick_t dataMin, TRI_voc_tick_t dataMax,
std::function<bool(TRI_voc_tick_t foundTick, TRI_df_marker_t const* marker)> const& callback) {
LOG(TRACE) << "getting datafiles in data range " << dataMin << " - " << dataMax;
std::vector<DatafileDescription> datafiles = datafilesInRange(dataMin, dataMax);
// now we have a list of datafiles...
size_t const n = datafiles.size();
for (size_t i = 0; i < n; ++i) {
auto const& e = datafiles[i];
TRI_datafile_t const* datafile = e._data;
// we are reading from a journal that might be modified in parallel
// so we must read-lock it
CONDITIONAL_READ_LOCKER(readLocker, _filesLock, e._isJournal);
if (!e._isJournal) {
TRI_ASSERT(datafile->_isSealed);
}
char const* ptr = datafile->_data;
char const* end = ptr + datafile->_currentSize;
while (ptr < end) {
auto const* marker = reinterpret_cast<TRI_df_marker_t const*>(ptr);
if (marker->getSize() == 0) {
// end of datafile
break;
}
TRI_df_marker_type_t type = marker->getType();
if (type <= TRI_DF_MARKER_MIN) {
break;
}
ptr += DatafileHelper::AlignedMarkerSize<size_t>(marker);
if (type == TRI_DF_MARKER_BLANK) {
// fully ignore these marker types. they don't need to be replicated,
// but we also cannot stop iteration if we find one of these
continue;
}
// get the marker's tick and check whether we should include it
TRI_voc_tick_t foundTick = marker->getTick();
if (foundTick <= dataMin) {
// marker too old
continue;
}
if (foundTick > dataMax) {
// marker too new
return false; // hasMore = false
}
if (type != TRI_DF_MARKER_VPACK_DOCUMENT &&
type != TRI_DF_MARKER_VPACK_REMOVE) {
// found a non-data marker...
// check if we can abort searching
if (foundTick >= dataMax || (foundTick > e._tickMax && i == (n - 1))) {
// fetched the last available marker
return false; // hasMore = false
}
continue;
}
// note the last tick we processed
bool doAbort = false;
if (!callback(foundTick, marker)) {
doAbort = true;
}
if (foundTick >= dataMax || (foundTick >= e._tickMax && i == (n - 1))) {
// fetched the last available marker
return false; // hasMore = false
}
if (doAbort) {
return true; // hasMore = true
}
} // next marker in datafile
} // next datafile
return false; // hasMore = false
}
Reference in New Issue View Git Blame Copy Permalink