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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "rocksdb/sst_file_reader.h"
#include "db/arena_wrapped_db_iter.h"
#include "db/db_iter.h"
#include "db/dbformat.h"
#include "file/random_access_file_reader.h"
#include "options/cf_options.h"
#include "rocksdb/env.h"
#include "rocksdb/file_system.h"
#include "table/get_context.h"
#include "table/table_builder.h"
#include "table/table_iterator.h"
#include "table/table_reader.h"
namespace ROCKSDB_NAMESPACE {
struct SstFileReader::Rep {
Options options;
EnvOptions soptions;
ImmutableOptions ioptions;
MutableCFOptions moptions;
// Keep a member variable for this, since `NewIterator()` uses a const
// reference of `ReadOptions`.
ReadOptions roptions_for_table_iter;
std::unique_ptr<TableReader> table_reader;
Rep(const Options& opts)
: options(opts),
soptions(options),
ioptions(options),
moptions(ColumnFamilyOptions(options)) {
roptions_for_table_iter =
ReadOptions(/*_verify_checksums=*/true, /*_fill_cache=*/false);
}
};
SstFileReader::SstFileReader(const Options& options) : rep_(new Rep(options)) {}
SstFileReader::~SstFileReader() = default;
Status SstFileReader::Open(const std::string& file_path) {
auto r = rep_.get();
Status s;
uint64_t file_size = 0;
std::unique_ptr<FSRandomAccessFile> file;
std::unique_ptr<RandomAccessFileReader> file_reader;
FileOptions fopts(r->soptions);
const auto& fs = r->options.env->GetFileSystem();
s = fs->GetFileSize(file_path, fopts.io_options, &file_size, nullptr);
if (s.ok()) {
s = fs->NewRandomAccessFile(file_path, fopts, &file, nullptr);
}
if (s.ok()) {
file_reader.reset(new RandomAccessFileReader(std::move(file), file_path));
}
if (s.ok()) {
TableReaderOptions t_opt(
r->ioptions, r->moptions.prefix_extractor, r->soptions,
r->ioptions.internal_comparator,
r->moptions.block_protection_bytes_per_key,
/*skip_filters*/ false, /*immortal*/ false,
/*force_direct_prefetch*/ false, /*level*/ -1,
/*block_cache_tracer*/ nullptr,
/*max_file_size_for_l0_meta_pin*/ 0, /*cur_db_session_id*/ "",
/*cur_file_num*/ 0,
/* unique_id */ {}, /* largest_seqno */ 0,
/* tail_size */ 0, r->ioptions.persist_user_defined_timestamps);
// Allow open file with global sequence number for backward compatibility.
t_opt.largest_seqno = kMaxSequenceNumber;
s = r->options.table_factory->NewTableReader(t_opt, std::move(file_reader),
file_size, &r->table_reader);
}
return s;
}
std::vector<Status> SstFileReader::MultiGet(const ReadOptions& roptions,
const std::vector<Slice>& keys,
std::vector<std::string>* values) {
const auto num_keys = keys.size();
std::vector<Status> statuses(num_keys, Status::OK());
std::vector<PinnableSlice> pin_values(num_keys);
auto r = rep_.get();
const Comparator* user_comparator =
r->ioptions.internal_comparator.user_comparator();
autovector<KeyContext, MultiGetContext::MAX_BATCH_SIZE> key_context;
autovector<KeyContext*, MultiGetContext::MAX_BATCH_SIZE> sorted_keys;
autovector<GetContext, MultiGetContext::MAX_BATCH_SIZE> get_ctx;
autovector<MergeContext, MultiGetContext::MAX_BATCH_SIZE> merge_ctx;
sorted_keys.resize(num_keys);
for (size_t i = 0; i < num_keys; ++i) {
PinnableSlice* val = &pin_values[i];
val->Reset();
merge_ctx.emplace_back();
key_context.emplace_back(nullptr, keys[i], val, nullptr,
nullptr /* timestamp */, &statuses[i]);
get_ctx.emplace_back(user_comparator, r->ioptions.merge_operator.get(),
nullptr, nullptr, GetContext::kNotFound,
*key_context[i].key, val, nullptr, nullptr, nullptr,
&merge_ctx[i], true,
&key_context[i].max_covering_tombstone_seq, nullptr);
key_context[i].get_context = &get_ctx[i];
}
for (size_t i = 0; i < num_keys; ++i) {
sorted_keys[i] = &key_context[i];
}
struct CompareKeyContext {
explicit CompareKeyContext(const Comparator* comp) : comparator(comp) {}
inline bool operator()(const KeyContext* lhs, const KeyContext* rhs) const {
return comparator->CompareWithoutTimestamp(*(lhs->key), false,
*(rhs->key), false) < 0;
}
const Comparator* comparator;
};
std::sort(sorted_keys.begin(), sorted_keys.end(),
CompareKeyContext(user_comparator));
const auto sequence = roptions.snapshot != nullptr
? roptions.snapshot->GetSequenceNumber()
: kMaxSequenceNumber;
MultiGetContext ctx(&sorted_keys, 0, num_keys, sequence, roptions,
r->ioptions.fs.get(), nullptr);
MultiGetRange range = ctx.GetMultiGetRange();
r->table_reader->MultiGet(roptions, &range,
r->moptions.prefix_extractor.get(),
false /* skip filters */);
values->resize(num_keys);
for (size_t i = 0; i < num_keys; ++i) {
if (statuses[i].ok()) {
switch (get_ctx[i].State()) {
case GetContext::kFound:
(*values)[i].assign(pin_values[i].data(), pin_values[i].size());
break;
case GetContext::kNotFound:
case GetContext::kDeleted:
statuses[i] = Status::NotFound();
break;
case GetContext::kMerge:
statuses[i] = Status::MergeInProgress();
break;
case GetContext::kCorrupt:
case GetContext::kUnexpectedBlobIndex:
case GetContext::kMergeOperatorFailed:
statuses[i] = Status::Corruption();
break;
};
}
}
return statuses;
}
Iterator* SstFileReader::NewIterator(const ReadOptions& roptions) {
assert(roptions.io_activity == Env::IOActivity::kUnknown);
auto r = rep_.get();
auto sequence = roptions.snapshot != nullptr
? roptions.snapshot->GetSequenceNumber()
: kMaxSequenceNumber;
ArenaWrappedDBIter* res = new ArenaWrappedDBIter();
res->Init(
r->options.env, roptions, r->ioptions, r->moptions, nullptr /* version */,
sequence, r->moptions.max_sequential_skip_in_iterations,
0 /* version_number */, nullptr /* read_callback */, nullptr /* cfh */,
true /* expose_blob_index */, false /* allow_refresh */);
auto internal_iter = r->table_reader->NewIterator(
res->GetReadOptions(), r->moptions.prefix_extractor.get(),
res->GetArena(), false /* skip_filters */,
TableReaderCaller::kSSTFileReader);
res->SetIterUnderDBIter(internal_iter);
return res;
}
std::unique_ptr<Iterator> SstFileReader::NewTableIterator() {
auto r = rep_.get();
InternalIterator* internal_iter = r->table_reader->NewIterator(
r->roptions_for_table_iter, r->moptions.prefix_extractor.get(),
/*arena*/ nullptr, false /* skip_filters */,
TableReaderCaller::kSSTFileReader);
assert(internal_iter);
if (internal_iter == nullptr) {
// Do not attempt to create a TableIterator if we cannot get a valid
// InternalIterator.
return nullptr;
}
return std::make_unique<TableIterator>(internal_iter);
}
std::shared_ptr<const TableProperties> SstFileReader::GetTableProperties()
const {
return rep_->table_reader->GetTableProperties();
}
Status SstFileReader::VerifyChecksum(const ReadOptions& read_options) {
assert(read_options.io_activity == Env::IOActivity::kUnknown);
return rep_->table_reader->VerifyChecksum(read_options,
TableReaderCaller::kSSTFileReader);
}
Status SstFileReader::VerifyNumEntries(const ReadOptions& read_options) {
Rep* r = rep_.get();
std::unique_ptr<InternalIterator> internal_iter{r->table_reader->NewIterator(
read_options, r->moptions.prefix_extractor.get(), nullptr,
false /* skip_filters */, TableReaderCaller::kSSTFileReader)};
internal_iter->SeekToFirst();
Status s = internal_iter->status();
if (!s.ok()) {
return s;
}
uint64_t num_read = 0;
for (; internal_iter->Valid(); internal_iter->Next()) {
++num_read;
}
s = internal_iter->status();
if (!s.ok()) {
return s;
}
std::shared_ptr<const TableProperties> tp = GetTableProperties();
if (!tp) {
s = Status::Corruption("table properties not available");
} else {
// TODO: verify num_range_deletions
uint64_t expected = tp->num_entries - tp->num_range_deletions;
if (num_read != expected) {
std::ostringstream oss;
oss << "Table property expects " << expected
<< " entries when excluding range deletions,"
<< " but scanning the table returned " << std::to_string(num_read)
<< " entries";
s = Status::Corruption(oss.str());
}
}
return s;
}
} // namespace ROCKSDB_NAMESPACE
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