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rocksdb/utilities/write_batch_with_index/write_batch_with_index.cc
Manuel Ung f622ca2c7c WriteUnPrepared: savepoint support (#5627) 
Summary:
Add savepoint support when the current transaction has flushed unprepared batches.

Rolling back to savepoint is similar to rolling back a transaction. It requires the set of keys that have changed since the savepoint, re-reading the keys at the snapshot at that savepoint, and the restoring the old keys by writing out another unprepared batch.

For this strategy to work though, we must be capable of reading keys at a savepoint. This does not work if keys were written out using the same sequence number before and after a savepoint. Therefore, when we flush out unprepared batches, we must split the batch by savepoint if any savepoints exist.

eg. If we have the following:
```
Put(A)
Put(B)
Put(C)
SetSavePoint()
Put(D)
Put(E)
SetSavePoint()
Put(F)
```

Then we will write out 3 separate unprepared batches:
```
Put(A) 1
Put(B) 1
Put(C) 1
Put(D) 2
Put(E) 2
Put(F) 3
```

This is so that when we rollback to eg. the first savepoint, we can just read keys at snapshot_seq = 1.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5627

Differential Revision: D16584130

Pulled By: lth

fbshipit-source-id: 6d100dd548fb20c4b76661bd0f8a2647e64477fa
2019-07-31 13:39:39 -07:00

1061 lines
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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).
#ifndef ROCKSDB_LITE
#include "rocksdb/utilities/write_batch_with_index.h"
#include <memory>
#include "db/column_family.h"
#include "db/db_impl/db_impl.h"
#include "db/merge_context.h"
#include "db/merge_helper.h"
#include "memory/arena.h"
#include "memtable/skiplist.h"
#include "options/db_options.h"
#include "rocksdb/comparator.h"
#include "rocksdb/iterator.h"
#include "util/cast_util.h"
#include "util/string_util.h"
#include "utilities/write_batch_with_index/write_batch_with_index_internal.h"
namespace rocksdb {
// when direction == forward
// * current_at_base_ <=> base_iterator > delta_iterator
// when direction == backwards
// * current_at_base_ <=> base_iterator < delta_iterator
// always:
// * equal_keys_ <=> base_iterator == delta_iterator
class BaseDeltaIterator : public Iterator {
public:
BaseDeltaIterator(Iterator* base_iterator, WBWIIterator* delta_iterator,
const Comparator* comparator)
: forward_(true),
current_at_base_(true),
equal_keys_(false),
status_(Status::OK()),
base_iterator_(base_iterator),
delta_iterator_(delta_iterator),
comparator_(comparator) {}
~BaseDeltaIterator() override {}
bool Valid() const override {
return current_at_base_ ? BaseValid() : DeltaValid();
}
void SeekToFirst() override {
forward_ = true;
base_iterator_->SeekToFirst();
delta_iterator_->SeekToFirst();
UpdateCurrent();
}
void SeekToLast() override {
forward_ = false;
base_iterator_->SeekToLast();
delta_iterator_->SeekToLast();
UpdateCurrent();
}
void Seek(const Slice& k) override {
forward_ = true;
base_iterator_->Seek(k);
delta_iterator_->Seek(k);
UpdateCurrent();
}
void SeekForPrev(const Slice& k) override {
forward_ = false;
base_iterator_->SeekForPrev(k);
delta_iterator_->SeekForPrev(k);
UpdateCurrent();
}
void Next() override {
if (!Valid()) {
status_ = Status::NotSupported("Next() on invalid iterator");
return;
}
if (!forward_) {
// Need to change direction
// if our direction was backward and we're not equal, we have two states:
// * both iterators are valid: we're already in a good state (current
// shows to smaller)
// * only one iterator is valid: we need to advance that iterator
forward_ = true;
equal_keys_ = false;
if (!BaseValid()) {
assert(DeltaValid());
base_iterator_->SeekToFirst();
} else if (!DeltaValid()) {
delta_iterator_->SeekToFirst();
} else if (current_at_base_) {
// Change delta from larger than base to smaller
AdvanceDelta();
} else {
// Change base from larger than delta to smaller
AdvanceBase();
}
if (DeltaValid() && BaseValid()) {
if (comparator_->Equal(delta_iterator_->Entry().key,
base_iterator_->key())) {
equal_keys_ = true;
}
}
}
Advance();
}
void Prev() override {
if (!Valid()) {
status_ = Status::NotSupported("Prev() on invalid iterator");
return;
}
if (forward_) {
// Need to change direction
// if our direction was backward and we're not equal, we have two states:
// * both iterators are valid: we're already in a good state (current
// shows to smaller)
// * only one iterator is valid: we need to advance that iterator
forward_ = false;
equal_keys_ = false;
if (!BaseValid()) {
assert(DeltaValid());
base_iterator_->SeekToLast();
} else if (!DeltaValid()) {
delta_iterator_->SeekToLast();
} else if (current_at_base_) {
// Change delta from less advanced than base to more advanced
AdvanceDelta();
} else {
// Change base from less advanced than delta to more advanced
AdvanceBase();
}
if (DeltaValid() && BaseValid()) {
if (comparator_->Equal(delta_iterator_->Entry().key,
base_iterator_->key())) {
equal_keys_ = true;
}
}
}
Advance();
}
Slice key() const override {
return current_at_base_ ? base_iterator_->key()
: delta_iterator_->Entry().key;
}
Slice value() const override {
return current_at_base_ ? base_iterator_->value()
: delta_iterator_->Entry().value;
}
Status status() const override {
if (!status_.ok()) {
return status_;
}
if (!base_iterator_->status().ok()) {
return base_iterator_->status();
}
return delta_iterator_->status();
}
private:
void AssertInvariants() {
#ifndef NDEBUG
bool not_ok = false;
if (!base_iterator_->status().ok()) {
assert(!base_iterator_->Valid());
not_ok = true;
}
if (!delta_iterator_->status().ok()) {
assert(!delta_iterator_->Valid());
not_ok = true;
}
if (not_ok) {
assert(!Valid());
assert(!status().ok());
return;
}
if (!Valid()) {
return;
}
if (!BaseValid()) {
assert(!current_at_base_ && delta_iterator_->Valid());
return;
}
if (!DeltaValid()) {
assert(current_at_base_ && base_iterator_->Valid());
return;
}
// we don't support those yet
assert(delta_iterator_->Entry().type != kMergeRecord &&
delta_iterator_->Entry().type != kLogDataRecord);
int compare = comparator_->Compare(delta_iterator_->Entry().key,
base_iterator_->key());
if (forward_) {
// current_at_base -> compare < 0
assert(!current_at_base_ || compare < 0);
// !current_at_base -> compare <= 0
assert(current_at_base_ && compare >= 0);
} else {
// current_at_base -> compare > 0
assert(!current_at_base_ || compare > 0);
// !current_at_base -> compare <= 0
assert(current_at_base_ && compare <= 0);
}
// equal_keys_ <=> compare == 0
assert((equal_keys_ || compare != 0) && (!equal_keys_ || compare == 0));
#endif
}
void Advance() {
if (equal_keys_) {
assert(BaseValid() && DeltaValid());
AdvanceBase();
AdvanceDelta();
} else {
if (current_at_base_) {
assert(BaseValid());
AdvanceBase();
} else {
assert(DeltaValid());
AdvanceDelta();
}
}
UpdateCurrent();
}
void AdvanceDelta() {
if (forward_) {
delta_iterator_->Next();
} else {
delta_iterator_->Prev();
}
}
void AdvanceBase() {
if (forward_) {
base_iterator_->Next();
} else {
base_iterator_->Prev();
}
}
bool BaseValid() const { return base_iterator_->Valid(); }
bool DeltaValid() const { return delta_iterator_->Valid(); }
void UpdateCurrent() {
// Suppress false positive clang analyzer warnings.
#ifndef __clang_analyzer__
status_ = Status::OK();
while (true) {
WriteEntry delta_entry;
if (DeltaValid()) {
assert(delta_iterator_->status().ok());
delta_entry = delta_iterator_->Entry();
} else if (!delta_iterator_->status().ok()) {
// Expose the error status and stop.
current_at_base_ = false;
return;
}
equal_keys_ = false;
if (!BaseValid()) {
if (!base_iterator_->status().ok()) {
// Expose the error status and stop.
current_at_base_ = true;
return;
}
// Base has finished.
if (!DeltaValid()) {
// Finished
return;
}
if (delta_entry.type == kDeleteRecord ||
delta_entry.type == kSingleDeleteRecord) {
AdvanceDelta();
} else {
current_at_base_ = false;
return;
}
} else if (!DeltaValid()) {
// Delta has finished.
current_at_base_ = true;
return;
} else {
int compare =
(forward_ ? 1 : -1) *
comparator_->Compare(delta_entry.key, base_iterator_->key());
if (compare <= 0) { // delta bigger or equal
if (compare == 0) {
equal_keys_ = true;
}
if (delta_entry.type != kDeleteRecord &&
delta_entry.type != kSingleDeleteRecord) {
current_at_base_ = false;
return;
}
// Delta is less advanced and is delete.
AdvanceDelta();
if (equal_keys_) {
AdvanceBase();
}
} else {
current_at_base_ = true;
return;
}
}
}
AssertInvariants();
#endif // __clang_analyzer__
}
bool forward_;
bool current_at_base_;
bool equal_keys_;
Status status_;
std::unique_ptr<Iterator> base_iterator_;
std::unique_ptr<WBWIIterator> delta_iterator_;
const Comparator* comparator_; // not owned
};
typedef SkipList<WriteBatchIndexEntry*, const WriteBatchEntryComparator&>
WriteBatchEntrySkipList;
class WBWIIteratorImpl : public WBWIIterator {
public:
WBWIIteratorImpl(uint32_t column_family_id,
WriteBatchEntrySkipList* skip_list,
const ReadableWriteBatch* write_batch)
: column_family_id_(column_family_id),
skip_list_iter_(skip_list),
write_batch_(write_batch) {}
~WBWIIteratorImpl() override {}
bool Valid() const override {
if (!skip_list_iter_.Valid()) {
return false;
}
const WriteBatchIndexEntry* iter_entry = skip_list_iter_.key();
return (iter_entry != nullptr &&
iter_entry->column_family == column_family_id_);
}
void SeekToFirst() override {
WriteBatchIndexEntry search_entry(
nullptr /* search_key */, column_family_id_,
true /* is_forward_direction */, true /* is_seek_to_first */);
skip_list_iter_.Seek(&search_entry);
}
void SeekToLast() override {
WriteBatchIndexEntry search_entry(
nullptr /* search_key */, column_family_id_ + 1,
true /* is_forward_direction */, true /* is_seek_to_first */);
skip_list_iter_.Seek(&search_entry);
if (!skip_list_iter_.Valid()) {
skip_list_iter_.SeekToLast();
} else {
skip_list_iter_.Prev();
}
}
void Seek(const Slice& key) override {
WriteBatchIndexEntry search_entry(&key, column_family_id_,
true /* is_forward_direction */,
false /* is_seek_to_first */);
skip_list_iter_.Seek(&search_entry);
}
void SeekForPrev(const Slice& key) override {
WriteBatchIndexEntry search_entry(&key, column_family_id_,
false /* is_forward_direction */,
false /* is_seek_to_first */);
skip_list_iter_.SeekForPrev(&search_entry);
}
void Next() override { skip_list_iter_.Next(); }
void Prev() override { skip_list_iter_.Prev(); }
WriteEntry Entry() const override {
WriteEntry ret;
Slice blob, xid;
const WriteBatchIndexEntry* iter_entry = skip_list_iter_.key();
// this is guaranteed with Valid()
assert(iter_entry != nullptr &&
iter_entry->column_family == column_family_id_);
auto s = write_batch_->GetEntryFromDataOffset(
iter_entry->offset, &ret.type, &ret.key, &ret.value, &blob, &xid);
assert(s.ok());
assert(ret.type == kPutRecord || ret.type == kDeleteRecord ||
ret.type == kSingleDeleteRecord || ret.type == kDeleteRangeRecord ||
ret.type == kMergeRecord);
return ret;
}
Status status() const override {
// this is in-memory data structure, so the only way status can be non-ok is
// through memory corruption
return Status::OK();
}
const WriteBatchIndexEntry* GetRawEntry() const {
return skip_list_iter_.key();
}
private:
uint32_t column_family_id_;
WriteBatchEntrySkipList::Iterator skip_list_iter_;
const ReadableWriteBatch* write_batch_;
};
struct WriteBatchWithIndex::Rep {
explicit Rep(const Comparator* index_comparator, size_t reserved_bytes = 0,
size_t max_bytes = 0, bool _overwrite_key = false)
: write_batch(reserved_bytes, max_bytes),
comparator(index_comparator, &write_batch),
skip_list(comparator, &arena),
overwrite_key(_overwrite_key),
last_entry_offset(0),
last_sub_batch_offset(0),
sub_batch_cnt(1) {}
ReadableWriteBatch write_batch;
WriteBatchEntryComparator comparator;
Arena arena;
WriteBatchEntrySkipList skip_list;
bool overwrite_key;
size_t last_entry_offset;
// The starting offset of the last sub-batch. A sub-batch starts right before
// inserting a key that is a duplicate of a key in the last sub-batch. Zero,
// the default, means that no duplicate key is detected so far.
size_t last_sub_batch_offset;
// Total number of sub-batches in the write batch. Default is 1.
size_t sub_batch_cnt;
// Remember current offset of internal write batch, which is used as
// the starting offset of the next record.
void SetLastEntryOffset() { last_entry_offset = write_batch.GetDataSize(); }
// In overwrite mode, find the existing entry for the same key and update it
// to point to the current entry.
// Return true if the key is found and updated.
bool UpdateExistingEntry(ColumnFamilyHandle* column_family, const Slice& key);
bool UpdateExistingEntryWithCfId(uint32_t column_family_id, const Slice& key);
// Add the recent entry to the update.
// In overwrite mode, if key already exists in the index, update it.
void AddOrUpdateIndex(ColumnFamilyHandle* column_family, const Slice& key);
void AddOrUpdateIndex(const Slice& key);
// Allocate an index entry pointing to the last entry in the write batch and
// put it to skip list.
void AddNewEntry(uint32_t column_family_id);
// Clear all updates buffered in this batch.
void Clear();
void ClearIndex();
// Rebuild index by reading all records from the batch.
// Returns non-ok status on corruption.
Status ReBuildIndex();
};
bool WriteBatchWithIndex::Rep::UpdateExistingEntry(
ColumnFamilyHandle* column_family, const Slice& key) {
uint32_t cf_id = GetColumnFamilyID(column_family);
return UpdateExistingEntryWithCfId(cf_id, key);
}
bool WriteBatchWithIndex::Rep::UpdateExistingEntryWithCfId(
uint32_t column_family_id, const Slice& key) {
if (!overwrite_key) {
return false;
}
WBWIIteratorImpl iter(column_family_id, &skip_list, &write_batch);
iter.Seek(key);
if (!iter.Valid()) {
return false;
}
if (comparator.CompareKey(column_family_id, key, iter.Entry().key) != 0) {
return false;
}
WriteBatchIndexEntry* non_const_entry =
const_cast<WriteBatchIndexEntry*>(iter.GetRawEntry());
if (LIKELY(last_sub_batch_offset <= non_const_entry->offset)) {
last_sub_batch_offset = last_entry_offset;
sub_batch_cnt++;
}
non_const_entry->offset = last_entry_offset;
return true;
}
void WriteBatchWithIndex::Rep::AddOrUpdateIndex(
ColumnFamilyHandle* column_family, const Slice& key) {
if (!UpdateExistingEntry(column_family, key)) {
uint32_t cf_id = GetColumnFamilyID(column_family);
const auto* cf_cmp = GetColumnFamilyUserComparator(column_family);
if (cf_cmp != nullptr) {
comparator.SetComparatorForCF(cf_id, cf_cmp);
}
AddNewEntry(cf_id);
}
}
void WriteBatchWithIndex::Rep::AddOrUpdateIndex(const Slice& key) {
if (!UpdateExistingEntryWithCfId(0, key)) {
AddNewEntry(0);
}
}
void WriteBatchWithIndex::Rep::AddNewEntry(uint32_t column_family_id) {
const std::string& wb_data = write_batch.Data();
Slice entry_ptr = Slice(wb_data.data() + last_entry_offset,
wb_data.size() - last_entry_offset);
// Extract key
Slice key;
bool success __attribute__((__unused__));
success =
ReadKeyFromWriteBatchEntry(&entry_ptr, &key, column_family_id != 0);
assert(success);
auto* mem = arena.Allocate(sizeof(WriteBatchIndexEntry));
auto* index_entry =
new (mem) WriteBatchIndexEntry(last_entry_offset, column_family_id,
key.data() - wb_data.data(), key.size());
skip_list.Insert(index_entry);
}
void WriteBatchWithIndex::Rep::Clear() {
write_batch.Clear();
ClearIndex();
}
void WriteBatchWithIndex::Rep::ClearIndex() {
skip_list.~WriteBatchEntrySkipList();
arena.~Arena();
new (&arena) Arena();
new (&skip_list) WriteBatchEntrySkipList(comparator, &arena);
last_entry_offset = 0;
last_sub_batch_offset = 0;
sub_batch_cnt = 1;
}
Status WriteBatchWithIndex::Rep::ReBuildIndex() {
Status s;
ClearIndex();
if (write_batch.Count() == 0) {
// Nothing to re-index
return s;
}
size_t offset = WriteBatchInternal::GetFirstOffset(&write_batch);
Slice input(write_batch.Data());
input.remove_prefix(offset);
// Loop through all entries in Rep and add each one to the index
int found = 0;
while (s.ok() && !input.empty()) {
Slice key, value, blob, xid;
uint32_t column_family_id = 0; // default
char tag = 0;
// set offset of current entry for call to AddNewEntry()
last_entry_offset = input.data() - write_batch.Data().data();
s = ReadRecordFromWriteBatch(&input, &tag, &column_family_id, &key,
&value, &blob, &xid);
if (!s.ok()) {
break;
}
switch (tag) {
case kTypeColumnFamilyValue:
case kTypeValue:
case kTypeColumnFamilyDeletion:
case kTypeDeletion:
case kTypeColumnFamilySingleDeletion:
case kTypeSingleDeletion:
case kTypeColumnFamilyMerge:
case kTypeMerge:
found++;
if (!UpdateExistingEntryWithCfId(column_family_id, key)) {
AddNewEntry(column_family_id);
}
break;
case kTypeLogData:
case kTypeBeginPrepareXID:
case kTypeBeginPersistedPrepareXID:
case kTypeBeginUnprepareXID:
case kTypeEndPrepareXID:
case kTypeCommitXID:
case kTypeRollbackXID:
case kTypeNoop:
break;
default:
return Status::Corruption("unknown WriteBatch tag in ReBuildIndex",
ToString(static_cast<unsigned int>(tag)));
}
}
if (s.ok() && found != write_batch.Count()) {
s = Status::Corruption("WriteBatch has wrong count");
}
return s;
}
WriteBatchWithIndex::WriteBatchWithIndex(
const Comparator* default_index_comparator, size_t reserved_bytes,
bool overwrite_key, size_t max_bytes)
: rep(new Rep(default_index_comparator, reserved_bytes, max_bytes,
overwrite_key)) {}
WriteBatchWithIndex::~WriteBatchWithIndex() {}
WriteBatchWithIndex::WriteBatchWithIndex(WriteBatchWithIndex&&) = default;
WriteBatchWithIndex& WriteBatchWithIndex::operator=(WriteBatchWithIndex&&) =
default;
WriteBatch* WriteBatchWithIndex::GetWriteBatch() { return &rep->write_batch; }
size_t WriteBatchWithIndex::SubBatchCnt() { return rep->sub_batch_cnt; }
WBWIIterator* WriteBatchWithIndex::NewIterator() {
return new WBWIIteratorImpl(0, &(rep->skip_list), &rep->write_batch);
}
WBWIIterator* WriteBatchWithIndex::NewIterator(
ColumnFamilyHandle* column_family) {
return new WBWIIteratorImpl(GetColumnFamilyID(column_family),
&(rep->skip_list), &rep->write_batch);
}
Iterator* WriteBatchWithIndex::NewIteratorWithBase(
ColumnFamilyHandle* column_family, Iterator* base_iterator) {
if (rep->overwrite_key == false) {
assert(false);
return nullptr;
}
return new BaseDeltaIterator(base_iterator, NewIterator(column_family),
GetColumnFamilyUserComparator(column_family));
}
Iterator* WriteBatchWithIndex::NewIteratorWithBase(Iterator* base_iterator) {
if (rep->overwrite_key == false) {
assert(false);
return nullptr;
}
// default column family's comparator
return new BaseDeltaIterator(base_iterator, NewIterator(),
rep->comparator.default_comparator());
}
Status WriteBatchWithIndex::Put(ColumnFamilyHandle* column_family,
const Slice& key, const Slice& value) {
rep->SetLastEntryOffset();
auto s = rep->write_batch.Put(column_family, key, value);
if (s.ok()) {
rep->AddOrUpdateIndex(column_family, key);
}
return s;
}
Status WriteBatchWithIndex::Put(const Slice& key, const Slice& value) {
rep->SetLastEntryOffset();
auto s = rep->write_batch.Put(key, value);
if (s.ok()) {
rep->AddOrUpdateIndex(key);
}
return s;
}
Status WriteBatchWithIndex::Delete(ColumnFamilyHandle* column_family,
const Slice& key) {
rep->SetLastEntryOffset();
auto s = rep->write_batch.Delete(column_family, key);
if (s.ok()) {
rep->AddOrUpdateIndex(column_family, key);
}
return s;
}
Status WriteBatchWithIndex::Delete(const Slice& key) {
rep->SetLastEntryOffset();
auto s = rep->write_batch.Delete(key);
if (s.ok()) {
rep->AddOrUpdateIndex(key);
}
return s;
}
Status WriteBatchWithIndex::SingleDelete(ColumnFamilyHandle* column_family,
const Slice& key) {
rep->SetLastEntryOffset();
auto s = rep->write_batch.SingleDelete(column_family, key);
if (s.ok()) {
rep->AddOrUpdateIndex(column_family, key);
}
return s;
}
Status WriteBatchWithIndex::SingleDelete(const Slice& key) {
rep->SetLastEntryOffset();
auto s = rep->write_batch.SingleDelete(key);
if (s.ok()) {
rep->AddOrUpdateIndex(key);
}
return s;
}
Status WriteBatchWithIndex::DeleteRange(ColumnFamilyHandle* column_family,
const Slice& begin_key,
const Slice& end_key) {
rep->SetLastEntryOffset();
auto s = rep->write_batch.DeleteRange(column_family, begin_key, end_key);
if (s.ok()) {
rep->AddOrUpdateIndex(column_family, begin_key);
}
return s;
}
Status WriteBatchWithIndex::DeleteRange(const Slice& begin_key,
const Slice& end_key) {
rep->SetLastEntryOffset();
auto s = rep->write_batch.DeleteRange(begin_key, end_key);
if (s.ok()) {
rep->AddOrUpdateIndex(begin_key);
}
return s;
}
Status WriteBatchWithIndex::Merge(ColumnFamilyHandle* column_family,
const Slice& key, const Slice& value) {
rep->SetLastEntryOffset();
auto s = rep->write_batch.Merge(column_family, key, value);
if (s.ok()) {
rep->AddOrUpdateIndex(column_family, key);
}
return s;
}
Status WriteBatchWithIndex::Merge(const Slice& key, const Slice& value) {
rep->SetLastEntryOffset();
auto s = rep->write_batch.Merge(key, value);
if (s.ok()) {
rep->AddOrUpdateIndex(key);
}
return s;
}
Status WriteBatchWithIndex::PutLogData(const Slice& blob) {
return rep->write_batch.PutLogData(blob);
}
void WriteBatchWithIndex::Clear() { rep->Clear(); }
Status WriteBatchWithIndex::GetFromBatch(ColumnFamilyHandle* column_family,
const DBOptions& options,
const Slice& key, std::string* value) {
Status s;
MergeContext merge_context;
const ImmutableDBOptions immuable_db_options(options);
WriteBatchWithIndexInternal::Result result =
WriteBatchWithIndexInternal::GetFromBatch(
immuable_db_options, this, column_family, key, &merge_context,
&rep->comparator, value, rep->overwrite_key, &s);
switch (result) {
case WriteBatchWithIndexInternal::Result::kFound:
case WriteBatchWithIndexInternal::Result::kError:
// use returned status
break;
case WriteBatchWithIndexInternal::Result::kDeleted:
case WriteBatchWithIndexInternal::Result::kNotFound:
s = Status::NotFound();
break;
case WriteBatchWithIndexInternal::Result::kMergeInProgress:
s = Status::MergeInProgress();
break;
default:
assert(false);
}
return s;
}
Status WriteBatchWithIndex::GetFromBatchAndDB(DB* db,
const ReadOptions& read_options,
const Slice& key,
std::string* value) {
assert(value != nullptr);
PinnableSlice pinnable_val(value);
assert(!pinnable_val.IsPinned());
auto s = GetFromBatchAndDB(db, read_options, db->DefaultColumnFamily(), key,
&pinnable_val);
if (s.ok() && pinnable_val.IsPinned()) {
value->assign(pinnable_val.data(), pinnable_val.size());
} // else value is already assigned
return s;
}
Status WriteBatchWithIndex::GetFromBatchAndDB(DB* db,
const ReadOptions& read_options,
const Slice& key,
PinnableSlice* pinnable_val) {
return GetFromBatchAndDB(db, read_options, db->DefaultColumnFamily(), key,
pinnable_val);
}
Status WriteBatchWithIndex::GetFromBatchAndDB(DB* db,
const ReadOptions& read_options,
ColumnFamilyHandle* column_family,
const Slice& key,
std::string* value) {
assert(value != nullptr);
PinnableSlice pinnable_val(value);
assert(!pinnable_val.IsPinned());
auto s =
GetFromBatchAndDB(db, read_options, column_family, key, &pinnable_val);
if (s.ok() && pinnable_val.IsPinned()) {
value->assign(pinnable_val.data(), pinnable_val.size());
} // else value is already assigned
return s;
}
Status WriteBatchWithIndex::GetFromBatchAndDB(DB* db,
const ReadOptions& read_options,
ColumnFamilyHandle* column_family,
const Slice& key,
PinnableSlice* pinnable_val) {
return GetFromBatchAndDB(db, read_options, column_family, key, pinnable_val,
nullptr);
}
Status WriteBatchWithIndex::GetFromBatchAndDB(
DB* db, const ReadOptions& read_options, ColumnFamilyHandle* column_family,
const Slice& key, PinnableSlice* pinnable_val, ReadCallback* callback) {
Status s;
MergeContext merge_context;
const ImmutableDBOptions& immuable_db_options =
static_cast_with_check<DBImpl, DB>(db->GetRootDB())
->immutable_db_options();
// Since the lifetime of the WriteBatch is the same as that of the transaction
// we cannot pin it as otherwise the returned value will not be available
// after the transaction finishes.
std::string& batch_value = *pinnable_val->GetSelf();
WriteBatchWithIndexInternal::Result result =
WriteBatchWithIndexInternal::GetFromBatch(
immuable_db_options, this, column_family, key, &merge_context,
&rep->comparator, &batch_value, rep->overwrite_key, &s);
if (result == WriteBatchWithIndexInternal::Result::kFound) {
pinnable_val->PinSelf();
return s;
}
if (result == WriteBatchWithIndexInternal::Result::kDeleted) {
return Status::NotFound();
}
if (result == WriteBatchWithIndexInternal::Result::kError) {
return s;
}
if (result == WriteBatchWithIndexInternal::Result::kMergeInProgress &&
rep->overwrite_key == true) {
// Since we've overwritten keys, we do not know what other operations are
// in this batch for this key, so we cannot do a Merge to compute the
// result. Instead, we will simply return MergeInProgress.
return Status::MergeInProgress();
}
assert(result == WriteBatchWithIndexInternal::Result::kMergeInProgress ||
result == WriteBatchWithIndexInternal::Result::kNotFound);
// Did not find key in batch OR could not resolve Merges. Try DB.
if (!callback) {
s = db->Get(read_options, column_family, key, pinnable_val);
} else {
s = static_cast_with_check<DBImpl, DB>(db->GetRootDB())
->GetImpl(read_options, column_family, key, pinnable_val, nullptr,
callback);
}
if (s.ok() || s.IsNotFound()) { // DB Get Succeeded
if (result == WriteBatchWithIndexInternal::Result::kMergeInProgress) {
// Merge result from DB with merges in Batch
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
const MergeOperator* merge_operator =
cfh->cfd()->ioptions()->merge_operator;
Statistics* statistics = immuable_db_options.statistics.get();
Env* env = immuable_db_options.env;
Logger* logger = immuable_db_options.info_log.get();
Slice* merge_data;
if (s.ok()) {
merge_data = pinnable_val;
} else { // Key not present in db (s.IsNotFound())
merge_data = nullptr;
}
if (merge_operator) {
s = MergeHelper::TimedFullMerge(
merge_operator, key, merge_data, merge_context.GetOperands(),
pinnable_val->GetSelf(), logger, statistics, env);
pinnable_val->PinSelf();
} else {
s = Status::InvalidArgument("Options::merge_operator must be set");
}
}
}
return s;
}
void WriteBatchWithIndex::MultiGetFromBatchAndDB(
DB* db, const ReadOptions& read_options, ColumnFamilyHandle* column_family,
const size_t num_keys, const Slice* keys, PinnableSlice* values,
Status* statuses, bool sorted_input) {
MultiGetFromBatchAndDB(db, read_options, column_family, num_keys, keys,
values, statuses, sorted_input, nullptr);
}
void WriteBatchWithIndex::MultiGetFromBatchAndDB(
DB* db, const ReadOptions& read_options, ColumnFamilyHandle* column_family,
const size_t num_keys, const Slice* keys, PinnableSlice* values,
Status* statuses, bool sorted_input, ReadCallback* callback) {
const ImmutableDBOptions& immuable_db_options =
static_cast_with_check<DBImpl, DB>(db->GetRootDB())
->immutable_db_options();
autovector<KeyContext, MultiGetContext::MAX_BATCH_SIZE> key_context;
// To hold merges from the write batch
autovector<std::pair<WriteBatchWithIndexInternal::Result, MergeContext>,
MultiGetContext::MAX_BATCH_SIZE>
merges;
// Since the lifetime of the WriteBatch is the same as that of the transaction
// we cannot pin it as otherwise the returned value will not be available
// after the transaction finishes.
for (size_t i = 0; i < num_keys; ++i) {
MergeContext merge_context;
PinnableSlice* pinnable_val = &values[i];
std::string& batch_value = *pinnable_val->GetSelf();
Status* s = &statuses[i];
WriteBatchWithIndexInternal::Result result =
WriteBatchWithIndexInternal::GetFromBatch(
immuable_db_options, this, column_family, keys[i], &merge_context,
&rep->comparator, &batch_value, rep->overwrite_key, s);
if (result == WriteBatchWithIndexInternal::Result::kFound) {
pinnable_val->PinSelf();
continue;
}
if (result == WriteBatchWithIndexInternal::Result::kDeleted) {
*s = Status::NotFound();
continue;
}
if (result == WriteBatchWithIndexInternal::Result::kError) {
continue;
}
if (result == WriteBatchWithIndexInternal::Result::kMergeInProgress &&
rep->overwrite_key == true) {
// Since we've overwritten keys, we do not know what other operations are
// in this batch for this key, so we cannot do a Merge to compute the
// result. Instead, we will simply return MergeInProgress.
*s = Status::MergeInProgress();
continue;
}
assert(result == WriteBatchWithIndexInternal::Result::kMergeInProgress ||
result == WriteBatchWithIndexInternal::Result::kNotFound);
key_context.emplace_back(keys[i], &values[i], &statuses[i]);
merges.emplace_back(result, std::move(merge_context));
}
// Did not find key in batch OR could not resolve Merges. Try DB.
static_cast_with_check<DBImpl, DB>(db->GetRootDB())
->MultiGetImpl(read_options, column_family, key_context, sorted_input,
callback);
ColumnFamilyHandleImpl* cfh =
reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
const MergeOperator* merge_operator = cfh->cfd()->ioptions()->merge_operator;
for (auto iter = key_context.begin(); iter != key_context.end(); ++iter) {
KeyContext& key = *iter;
if (key.s->ok() || key.s->IsNotFound()) { // DB Get Succeeded
size_t index = iter - key_context.begin();
std::pair<WriteBatchWithIndexInternal::Result, MergeContext>&
merge_result = merges[index];
if (merge_result.first ==
WriteBatchWithIndexInternal::Result::kMergeInProgress) {
// Merge result from DB with merges in Batch
Statistics* statistics = immuable_db_options.statistics.get();
Env* env = immuable_db_options.env;
Logger* logger = immuable_db_options.info_log.get();
Slice* merge_data;
if (key.s->ok()) {
merge_data = iter->value;
} else { // Key not present in db (s.IsNotFound())
merge_data = nullptr;
}
if (merge_operator) {
*key.s = MergeHelper::TimedFullMerge(
merge_operator, *key.key, merge_data,
merge_result.second.GetOperands(), key.value->GetSelf(), logger,
statistics, env);
key.value->PinSelf();
} else {
*key.s =
Status::InvalidArgument("Options::merge_operator must be set");
}
}
}
}
}
void WriteBatchWithIndex::SetSavePoint() { rep->write_batch.SetSavePoint(); }
Status WriteBatchWithIndex::RollbackToSavePoint() {
Status s = rep->write_batch.RollbackToSavePoint();
if (s.ok()) {
rep->sub_batch_cnt = 1;
rep->last_sub_batch_offset = 0;
s = rep->ReBuildIndex();
}
return s;
}
Status WriteBatchWithIndex::PopSavePoint() {
return rep->write_batch.PopSavePoint();
}
void WriteBatchWithIndex::SetMaxBytes(size_t max_bytes) {
rep->write_batch.SetMaxBytes(max_bytes);
}
size_t WriteBatchWithIndex::GetDataSize() const {
return rep->write_batch.GetDataSize();
}
} // namespace rocksdb
#endif // !ROCKSDB_LITE
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