0acaa1a846
Summary: Currently, we are tracking keys we need to rollback via a separate structure specific to WriteUnprepared in write_set_keys_. We already have a data structure called tracked_keys_ used to track which keys to unlock on transaction termination. This is exactly what we want, since we should only rollback keys that we have locked anyway. Save some memory by reusing that data structure instead of making our own. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5562 Differential Revision: D16206484 Pulled By: lth fbshipit-source-id: 5894d2b824a4b19062d84adbd6e6e86f00047488
563 lines
22 KiB
C++
563 lines
22 KiB
C++
// 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 "utilities/transactions/write_unprepared_txn.h"
|
|
#include "db/db_impl/db_impl.h"
|
|
#include "util/cast_util.h"
|
|
#include "utilities/transactions/write_unprepared_txn_db.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
bool WriteUnpreparedTxnReadCallback::IsVisibleFullCheck(SequenceNumber seq) {
|
|
auto unprep_seqs = txn_->GetUnpreparedSequenceNumbers();
|
|
|
|
// Since unprep_seqs maps prep_seq => prepare_batch_cnt, to check if seq is
|
|
// in unprep_seqs, we have to check if seq is equal to prep_seq or any of
|
|
// the prepare_batch_cnt seq nums after it.
|
|
//
|
|
// TODO(lth): Can be optimized with std::lower_bound if unprep_seqs is
|
|
// large.
|
|
for (const auto& it : unprep_seqs) {
|
|
if (it.first <= seq && seq < it.first + it.second) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return db_->IsInSnapshot(seq, wup_snapshot_, min_uncommitted_);
|
|
}
|
|
|
|
SequenceNumber WriteUnpreparedTxnReadCallback::CalcMaxUnpreparedSequenceNumber(
|
|
WriteUnpreparedTxn* txn) {
|
|
auto unprep_seqs = txn->GetUnpreparedSequenceNumbers();
|
|
if (unprep_seqs.size()) {
|
|
return unprep_seqs.rbegin()->first + unprep_seqs.rbegin()->second - 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
WriteUnpreparedTxn::WriteUnpreparedTxn(WriteUnpreparedTxnDB* txn_db,
|
|
const WriteOptions& write_options,
|
|
const TransactionOptions& txn_options)
|
|
: WritePreparedTxn(txn_db, write_options, txn_options),
|
|
wupt_db_(txn_db),
|
|
recovered_txn_(false) {
|
|
max_write_batch_size_ = txn_options.max_write_batch_size;
|
|
// We set max bytes to zero so that we don't get a memory limit error.
|
|
// Instead of trying to keep write batch strictly under the size limit, we
|
|
// just flush to DB when the limit is exceeded in write unprepared, to avoid
|
|
// having retry logic. This also allows very big key-value pairs that exceed
|
|
// max bytes to succeed.
|
|
write_batch_.SetMaxBytes(0);
|
|
}
|
|
|
|
WriteUnpreparedTxn::~WriteUnpreparedTxn() {
|
|
if (!unprep_seqs_.empty()) {
|
|
assert(log_number_ > 0);
|
|
assert(GetId() > 0);
|
|
assert(!name_.empty());
|
|
|
|
// We should rollback regardless of GetState, but some unit tests that
|
|
// test crash recovery run the destructor assuming that rollback does not
|
|
// happen, so that rollback during recovery can be exercised.
|
|
if (GetState() == STARTED) {
|
|
auto s __attribute__((__unused__)) = RollbackInternal();
|
|
// TODO(lth): Better error handling.
|
|
assert(s.ok());
|
|
dbimpl_->logs_with_prep_tracker()->MarkLogAsHavingPrepSectionFlushed(
|
|
log_number_);
|
|
}
|
|
}
|
|
|
|
// Call tracked_keys_.clear() so that ~PessimisticTransaction does not
|
|
// try to unlock keys for recovered transactions.
|
|
if (recovered_txn_) {
|
|
tracked_keys_.clear();
|
|
}
|
|
}
|
|
|
|
void WriteUnpreparedTxn::Initialize(const TransactionOptions& txn_options) {
|
|
PessimisticTransaction::Initialize(txn_options);
|
|
max_write_batch_size_ = txn_options.max_write_batch_size;
|
|
write_batch_.SetMaxBytes(0);
|
|
unprep_seqs_.clear();
|
|
recovered_txn_ = false;
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::Put(ColumnFamilyHandle* column_family,
|
|
const Slice& key, const Slice& value,
|
|
const bool assume_tracked) {
|
|
Status s = MaybeFlushWriteBatchToDB();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
return TransactionBaseImpl::Put(column_family, key, value, assume_tracked);
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::Put(ColumnFamilyHandle* column_family,
|
|
const SliceParts& key, const SliceParts& value,
|
|
const bool assume_tracked) {
|
|
Status s = MaybeFlushWriteBatchToDB();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
return TransactionBaseImpl::Put(column_family, key, value, assume_tracked);
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::Merge(ColumnFamilyHandle* column_family,
|
|
const Slice& key, const Slice& value,
|
|
const bool assume_tracked) {
|
|
Status s = MaybeFlushWriteBatchToDB();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
return TransactionBaseImpl::Merge(column_family, key, value, assume_tracked);
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::Delete(ColumnFamilyHandle* column_family,
|
|
const Slice& key, const bool assume_tracked) {
|
|
Status s = MaybeFlushWriteBatchToDB();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
return TransactionBaseImpl::Delete(column_family, key, assume_tracked);
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::Delete(ColumnFamilyHandle* column_family,
|
|
const SliceParts& key,
|
|
const bool assume_tracked) {
|
|
Status s = MaybeFlushWriteBatchToDB();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
return TransactionBaseImpl::Delete(column_family, key, assume_tracked);
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::SingleDelete(ColumnFamilyHandle* column_family,
|
|
const Slice& key,
|
|
const bool assume_tracked) {
|
|
Status s = MaybeFlushWriteBatchToDB();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
return TransactionBaseImpl::SingleDelete(column_family, key, assume_tracked);
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::SingleDelete(ColumnFamilyHandle* column_family,
|
|
const SliceParts& key,
|
|
const bool assume_tracked) {
|
|
Status s = MaybeFlushWriteBatchToDB();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
return TransactionBaseImpl::SingleDelete(column_family, key, assume_tracked);
|
|
}
|
|
|
|
// WriteUnpreparedTxn::RebuildFromWriteBatch is only called on recovery. For
|
|
// WriteUnprepared, the write batches have already been written into the
|
|
// database during WAL replay, so all we have to do is just to "retrack" the key
|
|
// so that rollbacks are possible.
|
|
//
|
|
// Calling TryLock instead of TrackKey is also possible, but as an optimization,
|
|
// recovered transactions do not hold locks on their keys. This follows the
|
|
// implementation in PessimisticTransactionDB::Initialize where we set
|
|
// skip_concurrency_control to true.
|
|
Status WriteUnpreparedTxn::RebuildFromWriteBatch(WriteBatch* wb) {
|
|
struct TrackKeyHandler : public WriteBatch::Handler {
|
|
WriteUnpreparedTxn* txn_;
|
|
bool rollback_merge_operands_;
|
|
|
|
TrackKeyHandler(WriteUnpreparedTxn* txn, bool rollback_merge_operands)
|
|
: txn_(txn), rollback_merge_operands_(rollback_merge_operands) {}
|
|
|
|
Status PutCF(uint32_t cf, const Slice& key, const Slice&) override {
|
|
txn_->TrackKey(cf, key.ToString(), kMaxSequenceNumber,
|
|
false /* read_only */, true /* exclusive */);
|
|
return Status::OK();
|
|
}
|
|
|
|
Status DeleteCF(uint32_t cf, const Slice& key) override {
|
|
txn_->TrackKey(cf, key.ToString(), kMaxSequenceNumber,
|
|
false /* read_only */, true /* exclusive */);
|
|
return Status::OK();
|
|
}
|
|
|
|
Status SingleDeleteCF(uint32_t cf, const Slice& key) override {
|
|
txn_->TrackKey(cf, key.ToString(), kMaxSequenceNumber,
|
|
false /* read_only */, true /* exclusive */);
|
|
return Status::OK();
|
|
}
|
|
|
|
Status MergeCF(uint32_t cf, const Slice& key, const Slice&) override {
|
|
if (rollback_merge_operands_) {
|
|
txn_->TrackKey(cf, key.ToString(), kMaxSequenceNumber,
|
|
false /* read_only */, true /* exclusive */);
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
// Recovered batches do not contain 2PC markers.
|
|
Status MarkBeginPrepare(bool) override { return Status::InvalidArgument(); }
|
|
|
|
Status MarkEndPrepare(const Slice&) override {
|
|
return Status::InvalidArgument();
|
|
}
|
|
|
|
Status MarkNoop(bool) override { return Status::InvalidArgument(); }
|
|
|
|
Status MarkCommit(const Slice&) override {
|
|
return Status::InvalidArgument();
|
|
}
|
|
|
|
Status MarkRollback(const Slice&) override {
|
|
return Status::InvalidArgument();
|
|
}
|
|
};
|
|
|
|
TrackKeyHandler handler(this,
|
|
wupt_db_->txn_db_options_.rollback_merge_operands);
|
|
return wb->Iterate(&handler);
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::MaybeFlushWriteBatchToDB() {
|
|
const bool kPrepared = true;
|
|
Status s;
|
|
if (max_write_batch_size_ != 0 &&
|
|
write_batch_.GetDataSize() > max_write_batch_size_) {
|
|
assert(GetState() != PREPARED);
|
|
s = FlushWriteBatchToDB(!kPrepared);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::FlushWriteBatchToDB(bool prepared) {
|
|
if (name_.empty()) {
|
|
return Status::InvalidArgument("Cannot write to DB without SetName.");
|
|
}
|
|
|
|
// TODO(lth): Reduce duplicate code with WritePrepared prepare logic.
|
|
WriteOptions write_options = write_options_;
|
|
write_options.disableWAL = false;
|
|
const bool WRITE_AFTER_COMMIT = true;
|
|
const bool first_prepare_batch = log_number_ == 0;
|
|
// MarkEndPrepare will change Noop marker to the appropriate marker.
|
|
WriteBatchInternal::MarkEndPrepare(GetWriteBatch()->GetWriteBatch(), name_,
|
|
!WRITE_AFTER_COMMIT, !prepared);
|
|
// For each duplicate key we account for a new sub-batch
|
|
prepare_batch_cnt_ = GetWriteBatch()->SubBatchCnt();
|
|
// AddPrepared better to be called in the pre-release callback otherwise there
|
|
// is a non-zero chance of max advancing prepare_seq and readers assume the
|
|
// data as committed.
|
|
// Also having it in the PreReleaseCallback allows in-order addition of
|
|
// prepared entries to PreparedHeap and hence enables an optimization. Refer
|
|
// to SmallestUnCommittedSeq for more details.
|
|
AddPreparedCallback add_prepared_callback(
|
|
wpt_db_, db_impl_, prepare_batch_cnt_,
|
|
db_impl_->immutable_db_options().two_write_queues, first_prepare_batch);
|
|
const bool DISABLE_MEMTABLE = true;
|
|
uint64_t seq_used = kMaxSequenceNumber;
|
|
// log_number_ should refer to the oldest log containing uncommitted data
|
|
// from the current transaction. This means that if log_number_ is set,
|
|
// WriteImpl should not overwrite that value, so set log_used to nullptr if
|
|
// log_number_ is already set.
|
|
uint64_t* log_used = log_number_ ? nullptr : &log_number_;
|
|
auto s = db_impl_->WriteImpl(write_options, GetWriteBatch()->GetWriteBatch(),
|
|
/*callback*/ nullptr, log_used, /*log ref*/
|
|
0, !DISABLE_MEMTABLE, &seq_used,
|
|
prepare_batch_cnt_, &add_prepared_callback);
|
|
assert(!s.ok() || seq_used != kMaxSequenceNumber);
|
|
auto prepare_seq = seq_used;
|
|
|
|
// Only call SetId if it hasn't been set yet.
|
|
if (GetId() == 0) {
|
|
SetId(prepare_seq);
|
|
}
|
|
// unprep_seqs_ will also contain prepared seqnos since they are treated in
|
|
// the same way in the prepare/commit callbacks. See the comment on the
|
|
// definition of unprep_seqs_.
|
|
unprep_seqs_[prepare_seq] = prepare_batch_cnt_;
|
|
|
|
// Reset transaction state.
|
|
if (!prepared) {
|
|
prepare_batch_cnt_ = 0;
|
|
write_batch_.Clear();
|
|
WriteBatchInternal::InsertNoop(write_batch_.GetWriteBatch());
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::PrepareInternal() {
|
|
const bool kPrepared = true;
|
|
return FlushWriteBatchToDB(kPrepared);
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::CommitWithoutPrepareInternal() {
|
|
if (unprep_seqs_.empty()) {
|
|
assert(log_number_ == 0);
|
|
assert(GetId() == 0);
|
|
return WritePreparedTxn::CommitWithoutPrepareInternal();
|
|
}
|
|
|
|
// TODO(lth): We should optimize commit without prepare to not perform
|
|
// a prepare under the hood.
|
|
auto s = PrepareInternal();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
return CommitInternal();
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::CommitInternal() {
|
|
// TODO(lth): Reduce duplicate code with WritePrepared commit logic.
|
|
|
|
// We take the commit-time batch and append the Commit marker. The Memtable
|
|
// will ignore the Commit marker in non-recovery mode
|
|
WriteBatch* working_batch = GetCommitTimeWriteBatch();
|
|
const bool empty = working_batch->Count() == 0;
|
|
WriteBatchInternal::MarkCommit(working_batch, name_);
|
|
|
|
const bool for_recovery = use_only_the_last_commit_time_batch_for_recovery_;
|
|
if (!empty && for_recovery) {
|
|
// When not writing to memtable, we can still cache the latest write batch.
|
|
// The cached batch will be written to memtable in WriteRecoverableState
|
|
// during FlushMemTable
|
|
WriteBatchInternal::SetAsLastestPersistentState(working_batch);
|
|
}
|
|
|
|
const bool includes_data = !empty && !for_recovery;
|
|
size_t commit_batch_cnt = 0;
|
|
if (UNLIKELY(includes_data)) {
|
|
ROCKS_LOG_WARN(db_impl_->immutable_db_options().info_log,
|
|
"Duplicate key overhead");
|
|
SubBatchCounter counter(*wpt_db_->GetCFComparatorMap());
|
|
auto s = working_batch->Iterate(&counter);
|
|
assert(s.ok());
|
|
commit_batch_cnt = counter.BatchCount();
|
|
}
|
|
const bool disable_memtable = !includes_data;
|
|
const bool do_one_write =
|
|
!db_impl_->immutable_db_options().two_write_queues || disable_memtable;
|
|
|
|
WriteUnpreparedCommitEntryPreReleaseCallback update_commit_map(
|
|
wpt_db_, db_impl_, unprep_seqs_, commit_batch_cnt);
|
|
const bool kFirstPrepareBatch = true;
|
|
AddPreparedCallback add_prepared_callback(
|
|
wpt_db_, db_impl_, commit_batch_cnt,
|
|
db_impl_->immutable_db_options().two_write_queues, !kFirstPrepareBatch);
|
|
PreReleaseCallback* pre_release_callback;
|
|
if (do_one_write) {
|
|
pre_release_callback = &update_commit_map;
|
|
} else {
|
|
pre_release_callback = &add_prepared_callback;
|
|
}
|
|
uint64_t seq_used = kMaxSequenceNumber;
|
|
// Since the prepared batch is directly written to memtable, there is
|
|
// already a connection between the memtable and its WAL, so there is no
|
|
// need to redundantly reference the log that contains the prepared data.
|
|
const uint64_t zero_log_number = 0ull;
|
|
size_t batch_cnt = UNLIKELY(commit_batch_cnt) ? commit_batch_cnt : 1;
|
|
auto s = db_impl_->WriteImpl(write_options_, working_batch, nullptr, nullptr,
|
|
zero_log_number, disable_memtable, &seq_used,
|
|
batch_cnt, pre_release_callback);
|
|
assert(!s.ok() || seq_used != kMaxSequenceNumber);
|
|
const SequenceNumber commit_batch_seq = seq_used;
|
|
if (LIKELY(do_one_write || !s.ok())) {
|
|
if (LIKELY(s.ok())) {
|
|
// Note RemovePrepared should be called after WriteImpl that publishsed
|
|
// the seq. Otherwise SmallestUnCommittedSeq optimization breaks.
|
|
for (const auto& seq : unprep_seqs_) {
|
|
wpt_db_->RemovePrepared(seq.first, seq.second);
|
|
}
|
|
}
|
|
if (UNLIKELY(!do_one_write)) {
|
|
wpt_db_->RemovePrepared(commit_batch_seq, commit_batch_cnt);
|
|
}
|
|
unprep_seqs_.clear();
|
|
return s;
|
|
} // else do the 2nd write to publish seq
|
|
|
|
// Populate unprep_seqs_ with commit_batch_seq, since we treat data in the
|
|
// commit write batch as just another "unprepared" batch. This will also
|
|
// update the unprep_seqs_ in the update_commit_map callback.
|
|
unprep_seqs_[commit_batch_seq] = commit_batch_cnt;
|
|
|
|
// Note: the 2nd write comes with a performance penality. So if we have too
|
|
// many of commits accompanied with ComitTimeWriteBatch and yet we cannot
|
|
// enable use_only_the_last_commit_time_batch_for_recovery_ optimization,
|
|
// two_write_queues should be disabled to avoid many additional writes here.
|
|
|
|
// Update commit map only from the 2nd queue
|
|
WriteBatch empty_batch;
|
|
empty_batch.PutLogData(Slice());
|
|
// In the absence of Prepare markers, use Noop as a batch separator
|
|
WriteBatchInternal::InsertNoop(&empty_batch);
|
|
const bool DISABLE_MEMTABLE = true;
|
|
const size_t ONE_BATCH = 1;
|
|
const uint64_t NO_REF_LOG = 0;
|
|
s = db_impl_->WriteImpl(write_options_, &empty_batch, nullptr, nullptr,
|
|
NO_REF_LOG, DISABLE_MEMTABLE, &seq_used, ONE_BATCH,
|
|
&update_commit_map);
|
|
assert(!s.ok() || seq_used != kMaxSequenceNumber);
|
|
// Note RemovePrepared should be called after WriteImpl that publishsed the
|
|
// seq. Otherwise SmallestUnCommittedSeq optimization breaks.
|
|
for (const auto& seq : unprep_seqs_) {
|
|
wpt_db_->RemovePrepared(seq.first, seq.second);
|
|
}
|
|
unprep_seqs_.clear();
|
|
return s;
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::RollbackInternal() {
|
|
// TODO(lth): Reduce duplicate code with WritePrepared rollback logic.
|
|
WriteBatchWithIndex rollback_batch(
|
|
wpt_db_->DefaultColumnFamily()->GetComparator(), 0, true, 0);
|
|
assert(GetId() != kMaxSequenceNumber);
|
|
assert(GetId() > 0);
|
|
Status s;
|
|
const auto& cf_map = *wupt_db_->GetCFHandleMap();
|
|
auto read_at_seq = kMaxSequenceNumber;
|
|
|
|
ReadOptions roptions;
|
|
// Note that we do not use WriteUnpreparedTxnReadCallback because we do not
|
|
// need to read our own writes when reading prior versions of the key for
|
|
// rollback.
|
|
const auto& tracked_keys = GetTrackedKeys();
|
|
WritePreparedTxnReadCallback callback(wpt_db_, read_at_seq);
|
|
for (const auto& cfkey : tracked_keys) {
|
|
const auto cfid = cfkey.first;
|
|
const auto& keys = cfkey.second;
|
|
for (const auto& pair : keys) {
|
|
const auto& key = pair.first;
|
|
const auto& cf_handle = cf_map.at(cfid);
|
|
PinnableSlice pinnable_val;
|
|
bool not_used;
|
|
s = db_impl_->GetImpl(roptions, cf_handle, key, &pinnable_val, ¬_used,
|
|
&callback);
|
|
|
|
if (s.ok()) {
|
|
s = rollback_batch.Put(cf_handle, key, pinnable_val);
|
|
assert(s.ok());
|
|
} else if (s.IsNotFound()) {
|
|
s = rollback_batch.Delete(cf_handle, key);
|
|
assert(s.ok());
|
|
} else {
|
|
return s;
|
|
}
|
|
}
|
|
}
|
|
|
|
// The Rollback marker will be used as a batch separator
|
|
WriteBatchInternal::MarkRollback(rollback_batch.GetWriteBatch(), name_);
|
|
bool do_one_write = !db_impl_->immutable_db_options().two_write_queues;
|
|
const bool DISABLE_MEMTABLE = true;
|
|
const uint64_t NO_REF_LOG = 0;
|
|
uint64_t seq_used = kMaxSequenceNumber;
|
|
// TODO(lth): We write rollback batch all in a single batch here, but this
|
|
// should be subdivded into multiple batches as well. In phase 2, when key
|
|
// sets are read from WAL, this will happen naturally.
|
|
const size_t ONE_BATCH = 1;
|
|
// We commit the rolled back prepared batches. ALthough this is
|
|
// counter-intuitive, i) it is safe to do so, since the prepared batches are
|
|
// already canceled out by the rollback batch, ii) adding the commit entry to
|
|
// CommitCache will allow us to benefit from the existing mechanism in
|
|
// CommitCache that keeps an entry evicted due to max advance and yet overlaps
|
|
// with a live snapshot around so that the live snapshot properly skips the
|
|
// entry even if its prepare seq is lower than max_evicted_seq_.
|
|
WriteUnpreparedCommitEntryPreReleaseCallback update_commit_map(
|
|
wpt_db_, db_impl_, unprep_seqs_, ONE_BATCH);
|
|
// Note: the rollback batch does not need AddPrepared since it is written to
|
|
// DB in one shot. min_uncommitted still works since it requires capturing
|
|
// data that is written to DB but not yet committed, while the roolback
|
|
// batch commits with PreReleaseCallback.
|
|
s = db_impl_->WriteImpl(write_options_, rollback_batch.GetWriteBatch(),
|
|
nullptr, nullptr, NO_REF_LOG, !DISABLE_MEMTABLE,
|
|
&seq_used, rollback_batch.SubBatchCnt(),
|
|
do_one_write ? &update_commit_map : nullptr);
|
|
assert(!s.ok() || seq_used != kMaxSequenceNumber);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (do_one_write) {
|
|
for (const auto& seq : unprep_seqs_) {
|
|
wpt_db_->RemovePrepared(seq.first, seq.second);
|
|
}
|
|
unprep_seqs_.clear();
|
|
return s;
|
|
} // else do the 2nd write for commit
|
|
uint64_t& prepare_seq = seq_used;
|
|
ROCKS_LOG_DETAILS(db_impl_->immutable_db_options().info_log,
|
|
"RollbackInternal 2nd write prepare_seq: %" PRIu64,
|
|
prepare_seq);
|
|
// Commit the batch by writing an empty batch to the queue that will release
|
|
// the commit sequence number to readers.
|
|
WriteUnpreparedRollbackPreReleaseCallback update_commit_map_with_prepare(
|
|
wpt_db_, db_impl_, unprep_seqs_, prepare_seq);
|
|
WriteBatch empty_batch;
|
|
empty_batch.PutLogData(Slice());
|
|
// In the absence of Prepare markers, use Noop as a batch separator
|
|
WriteBatchInternal::InsertNoop(&empty_batch);
|
|
s = db_impl_->WriteImpl(write_options_, &empty_batch, nullptr, nullptr,
|
|
NO_REF_LOG, DISABLE_MEMTABLE, &seq_used, ONE_BATCH,
|
|
&update_commit_map_with_prepare);
|
|
assert(!s.ok() || seq_used != kMaxSequenceNumber);
|
|
// Mark the txn as rolled back
|
|
if (s.ok()) {
|
|
for (const auto& seq : unprep_seqs_) {
|
|
wpt_db_->RemovePrepared(seq.first, seq.second);
|
|
}
|
|
}
|
|
|
|
unprep_seqs_.clear();
|
|
return s;
|
|
}
|
|
|
|
void WriteUnpreparedTxn::Clear() {
|
|
if (!recovered_txn_) {
|
|
txn_db_impl_->UnLock(this, &GetTrackedKeys());
|
|
}
|
|
TransactionBaseImpl::Clear();
|
|
}
|
|
|
|
Status WriteUnpreparedTxn::Get(const ReadOptions& options,
|
|
ColumnFamilyHandle* column_family,
|
|
const Slice& key, PinnableSlice* value) {
|
|
SequenceNumber min_uncommitted, snap_seq;
|
|
const bool backed_by_snapshot =
|
|
wupt_db_->AssignMinMaxSeqs(options.snapshot, &min_uncommitted, &snap_seq);
|
|
WriteUnpreparedTxnReadCallback callback(wupt_db_, snap_seq, min_uncommitted,
|
|
this);
|
|
auto res = write_batch_.GetFromBatchAndDB(db_, options, column_family, key,
|
|
value, &callback);
|
|
if (LIKELY(wupt_db_->ValidateSnapshot(snap_seq, backed_by_snapshot))) {
|
|
return res;
|
|
} else {
|
|
return Status::TryAgain();
|
|
}
|
|
}
|
|
|
|
Iterator* WriteUnpreparedTxn::GetIterator(const ReadOptions& options) {
|
|
return GetIterator(options, wupt_db_->DefaultColumnFamily());
|
|
}
|
|
|
|
Iterator* WriteUnpreparedTxn::GetIterator(const ReadOptions& options,
|
|
ColumnFamilyHandle* column_family) {
|
|
// Make sure to get iterator from WriteUnprepareTxnDB, not the root db.
|
|
Iterator* db_iter = wupt_db_->NewIterator(options, column_family, this);
|
|
assert(db_iter);
|
|
|
|
return write_batch_.NewIteratorWithBase(column_family, db_iter);
|
|
}
|
|
|
|
const std::map<SequenceNumber, size_t>&
|
|
WriteUnpreparedTxn::GetUnpreparedSequenceNumbers() {
|
|
return unprep_seqs_;
|
|
}
|
|
|
|
} // namespace rocksdb
|
|
|
|
#endif // ROCKSDB_LITE
|