fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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220 lines
7.7 KiB
220 lines
7.7 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "db/db_impl_readonly.h"
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#include "db/compacted_db_impl.h"
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#include "db/db_impl.h"
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#include "db/db_iter.h"
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#include "db/merge_context.h"
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#include "monitoring/perf_context_imp.h"
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namespace rocksdb {
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#ifndef ROCKSDB_LITE
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DBImplReadOnly::DBImplReadOnly(const DBOptions& db_options,
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const std::string& dbname)
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: DBImpl(db_options, dbname) {
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ROCKS_LOG_INFO(immutable_db_options_.info_log,
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"Opening the db in read only mode");
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LogFlush(immutable_db_options_.info_log);
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}
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DBImplReadOnly::~DBImplReadOnly() {}
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// Implementations of the DB interface
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Status DBImplReadOnly::Get(const ReadOptions& read_options,
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ColumnFamilyHandle* column_family, const Slice& key,
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PinnableSlice* pinnable_val) {
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assert(pinnable_val != nullptr);
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// TODO: stopwatch DB_GET needed?, perf timer needed?
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PERF_TIMER_GUARD(get_snapshot_time);
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Status s;
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SequenceNumber snapshot = versions_->LastSequence();
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auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
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auto cfd = cfh->cfd();
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if (tracer_) {
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InstrumentedMutexLock lock(&trace_mutex_);
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if (tracer_) {
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tracer_->Get(column_family, key);
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}
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}
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SuperVersion* super_version = cfd->GetSuperVersion();
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MergeContext merge_context;
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SequenceNumber max_covering_tombstone_seq = 0;
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LookupKey lkey(key, snapshot);
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PERF_TIMER_STOP(get_snapshot_time);
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if (super_version->mem->Get(lkey, pinnable_val->GetSelf(), &s, &merge_context,
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&max_covering_tombstone_seq, read_options)) {
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pinnable_val->PinSelf();
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RecordTick(stats_, MEMTABLE_HIT);
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} else {
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PERF_TIMER_GUARD(get_from_output_files_time);
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super_version->current->Get(read_options, lkey, pinnable_val, &s,
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&merge_context, &max_covering_tombstone_seq);
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RecordTick(stats_, MEMTABLE_MISS);
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}
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RecordTick(stats_, NUMBER_KEYS_READ);
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size_t size = pinnable_val->size();
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RecordTick(stats_, BYTES_READ, size);
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RecordInHistogram(stats_, BYTES_PER_READ, size);
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PERF_COUNTER_ADD(get_read_bytes, size);
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return s;
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}
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Iterator* DBImplReadOnly::NewIterator(const ReadOptions& read_options,
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ColumnFamilyHandle* column_family) {
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auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
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auto cfd = cfh->cfd();
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SuperVersion* super_version = cfd->GetSuperVersion()->Ref();
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SequenceNumber latest_snapshot = versions_->LastSequence();
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SequenceNumber read_seq =
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read_options.snapshot != nullptr
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? reinterpret_cast<const SnapshotImpl*>(read_options.snapshot)
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->number_
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: latest_snapshot;
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ReadCallback* read_callback = nullptr; // No read callback provided.
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auto db_iter = NewArenaWrappedDbIterator(
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env_, read_options, *cfd->ioptions(), super_version->mutable_cf_options,
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read_seq,
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super_version->mutable_cf_options.max_sequential_skip_in_iterations,
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super_version->version_number, read_callback);
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auto internal_iter =
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NewInternalIterator(read_options, cfd, super_version, db_iter->GetArena(),
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db_iter->GetRangeDelAggregator(), read_seq);
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db_iter->SetIterUnderDBIter(internal_iter);
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return db_iter;
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}
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Status DBImplReadOnly::NewIterators(
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const ReadOptions& read_options,
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const std::vector<ColumnFamilyHandle*>& column_families,
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std::vector<Iterator*>* iterators) {
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ReadCallback* read_callback = nullptr; // No read callback provided.
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if (iterators == nullptr) {
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return Status::InvalidArgument("iterators not allowed to be nullptr");
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}
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iterators->clear();
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iterators->reserve(column_families.size());
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SequenceNumber latest_snapshot = versions_->LastSequence();
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SequenceNumber read_seq =
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read_options.snapshot != nullptr
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? reinterpret_cast<const SnapshotImpl*>(read_options.snapshot)
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->number_
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: latest_snapshot;
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for (auto cfh : column_families) {
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auto* cfd = reinterpret_cast<ColumnFamilyHandleImpl*>(cfh)->cfd();
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auto* sv = cfd->GetSuperVersion()->Ref();
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auto* db_iter = NewArenaWrappedDbIterator(
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env_, read_options, *cfd->ioptions(), sv->mutable_cf_options, read_seq,
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sv->mutable_cf_options.max_sequential_skip_in_iterations,
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sv->version_number, read_callback);
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auto* internal_iter =
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NewInternalIterator(read_options, cfd, sv, db_iter->GetArena(),
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db_iter->GetRangeDelAggregator(), read_seq);
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db_iter->SetIterUnderDBIter(internal_iter);
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iterators->push_back(db_iter);
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}
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return Status::OK();
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}
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Status DB::OpenForReadOnly(const Options& options, const std::string& dbname,
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DB** dbptr, bool /*error_if_log_file_exist*/) {
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*dbptr = nullptr;
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// Try to first open DB as fully compacted DB
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Status s;
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s = CompactedDBImpl::Open(options, dbname, dbptr);
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if (s.ok()) {
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return s;
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}
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DBOptions db_options(options);
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ColumnFamilyOptions cf_options(options);
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std::vector<ColumnFamilyDescriptor> column_families;
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column_families.push_back(
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ColumnFamilyDescriptor(kDefaultColumnFamilyName, cf_options));
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std::vector<ColumnFamilyHandle*> handles;
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s = DB::OpenForReadOnly(db_options, dbname, column_families, &handles, dbptr);
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if (s.ok()) {
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assert(handles.size() == 1);
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// i can delete the handle since DBImpl is always holding a
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// reference to default column family
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delete handles[0];
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}
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return s;
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}
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Status DB::OpenForReadOnly(
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const DBOptions& db_options, const std::string& dbname,
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const std::vector<ColumnFamilyDescriptor>& column_families,
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std::vector<ColumnFamilyHandle*>* handles, DB** dbptr,
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bool error_if_log_file_exist) {
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*dbptr = nullptr;
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handles->clear();
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SuperVersionContext sv_context(/* create_superversion */ true);
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DBImplReadOnly* impl = new DBImplReadOnly(db_options, dbname);
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impl->mutex_.Lock();
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Status s = impl->Recover(column_families, true /* read only */,
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error_if_log_file_exist);
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if (s.ok()) {
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// set column family handles
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for (auto cf : column_families) {
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auto cfd =
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impl->versions_->GetColumnFamilySet()->GetColumnFamily(cf.name);
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if (cfd == nullptr) {
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s = Status::InvalidArgument("Column family not found: ", cf.name);
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break;
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}
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handles->push_back(new ColumnFamilyHandleImpl(cfd, impl, &impl->mutex_));
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}
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}
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if (s.ok()) {
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for (auto cfd : *impl->versions_->GetColumnFamilySet()) {
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sv_context.NewSuperVersion();
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cfd->InstallSuperVersion(&sv_context, &impl->mutex_);
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}
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}
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impl->mutex_.Unlock();
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sv_context.Clean();
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if (s.ok()) {
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*dbptr = impl;
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for (auto* h : *handles) {
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impl->NewThreadStatusCfInfo(
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reinterpret_cast<ColumnFamilyHandleImpl*>(h)->cfd());
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}
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} else {
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for (auto h : *handles) {
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delete h;
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}
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handles->clear();
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delete impl;
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}
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return s;
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}
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#else // !ROCKSDB_LITE
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Status DB::OpenForReadOnly(const Options& /*options*/,
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const std::string& /*dbname*/, DB** /*dbptr*/,
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bool /*error_if_log_file_exist*/) {
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return Status::NotSupported("Not supported in ROCKSDB_LITE.");
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}
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Status DB::OpenForReadOnly(
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const DBOptions& /*db_options*/, const std::string& /*dbname*/,
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const std::vector<ColumnFamilyDescriptor>& /*column_families*/,
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std::vector<ColumnFamilyHandle*>* /*handles*/, DB** /*dbptr*/,
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bool /*error_if_log_file_exist*/) {
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return Status::NotSupported("Not supported in ROCKSDB_LITE.");
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}
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#endif // !ROCKSDB_LITE
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} // namespace rocksdb
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