Summary:
This reverts the previous commit 1d7048c598
, which broke the build.
Did a `git revert 1d7048c`.
Closes https://github.com/facebook/rocksdb/pull/2627
Differential Revision: D5476473
Pulled By: sagar0
fbshipit-source-id: 4756ff5c0dfc88c17eceb00e02c36176de728d06
206 lines
6.8 KiB
C++
206 lines
6.8 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).
|
|
|
|
#include "table/get_context.h"
|
|
#include "db/merge_helper.h"
|
|
#include "db/pinned_iterators_manager.h"
|
|
#include "monitoring/file_read_sample.h"
|
|
#include "monitoring/perf_context_imp.h"
|
|
#include "monitoring/statistics.h"
|
|
#include "rocksdb/env.h"
|
|
#include "rocksdb/merge_operator.h"
|
|
#include "rocksdb/statistics.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
namespace {
|
|
|
|
void appendToReplayLog(std::string* replay_log, ValueType type, Slice value) {
|
|
#ifndef ROCKSDB_LITE
|
|
if (replay_log) {
|
|
if (replay_log->empty()) {
|
|
// Optimization: in the common case of only one operation in the
|
|
// log, we allocate the exact amount of space needed.
|
|
replay_log->reserve(1 + VarintLength(value.size()) + value.size());
|
|
}
|
|
replay_log->push_back(type);
|
|
PutLengthPrefixedSlice(replay_log, value);
|
|
}
|
|
#endif // ROCKSDB_LITE
|
|
}
|
|
|
|
} // namespace
|
|
|
|
GetContext::GetContext(const Comparator* ucmp,
|
|
const MergeOperator* merge_operator, Logger* logger,
|
|
Statistics* statistics, GetState init_state,
|
|
const Slice& user_key, PinnableSlice* pinnable_val,
|
|
bool* value_found, MergeContext* merge_context,
|
|
RangeDelAggregator* _range_del_agg, Env* env,
|
|
SequenceNumber* seq,
|
|
PinnedIteratorsManager* _pinned_iters_mgr)
|
|
: ucmp_(ucmp),
|
|
merge_operator_(merge_operator),
|
|
logger_(logger),
|
|
statistics_(statistics),
|
|
state_(init_state),
|
|
user_key_(user_key),
|
|
pinnable_val_(pinnable_val),
|
|
value_found_(value_found),
|
|
merge_context_(merge_context),
|
|
range_del_agg_(_range_del_agg),
|
|
env_(env),
|
|
seq_(seq),
|
|
replay_log_(nullptr),
|
|
pinned_iters_mgr_(_pinned_iters_mgr) {
|
|
if (seq_) {
|
|
*seq_ = kMaxSequenceNumber;
|
|
}
|
|
sample_ = should_sample_file_read();
|
|
}
|
|
|
|
// Called from TableCache::Get and Table::Get when file/block in which
|
|
// key may exist are not there in TableCache/BlockCache respectively. In this
|
|
// case we can't guarantee that key does not exist and are not permitted to do
|
|
// IO to be certain.Set the status=kFound and value_found=false to let the
|
|
// caller know that key may exist but is not there in memory
|
|
void GetContext::MarkKeyMayExist() {
|
|
state_ = kFound;
|
|
if (value_found_ != nullptr) {
|
|
*value_found_ = false;
|
|
}
|
|
}
|
|
|
|
void GetContext::SaveValue(const Slice& value, SequenceNumber seq) {
|
|
assert(state_ == kNotFound);
|
|
appendToReplayLog(replay_log_, kTypeValue, value);
|
|
|
|
state_ = kFound;
|
|
if (LIKELY(pinnable_val_ != nullptr)) {
|
|
pinnable_val_->PinSelf(value);
|
|
}
|
|
}
|
|
|
|
bool GetContext::SaveValue(const ParsedInternalKey& parsed_key,
|
|
const Slice& value, Cleanable* value_pinner) {
|
|
assert((state_ != kMerge && parsed_key.type != kTypeMerge) ||
|
|
merge_context_ != nullptr);
|
|
if (ucmp_->Equal(parsed_key.user_key, user_key_)) {
|
|
appendToReplayLog(replay_log_, parsed_key.type, value);
|
|
|
|
if (seq_ != nullptr) {
|
|
// Set the sequence number if it is uninitialized
|
|
if (*seq_ == kMaxSequenceNumber) {
|
|
*seq_ = parsed_key.sequence;
|
|
}
|
|
}
|
|
|
|
auto type = parsed_key.type;
|
|
// Key matches. Process it
|
|
if ((type == kTypeValue || type == kTypeMerge) &&
|
|
range_del_agg_ != nullptr && range_del_agg_->ShouldDelete(parsed_key)) {
|
|
type = kTypeRangeDeletion;
|
|
}
|
|
switch (type) {
|
|
case kTypeValue:
|
|
assert(state_ == kNotFound || state_ == kMerge);
|
|
if (kNotFound == state_) {
|
|
state_ = kFound;
|
|
if (LIKELY(pinnable_val_ != nullptr)) {
|
|
if (LIKELY(value_pinner != nullptr)) {
|
|
// If the backing resources for the value are provided, pin them
|
|
pinnable_val_->PinSlice(value, value_pinner);
|
|
} else {
|
|
// Otherwise copy the value
|
|
pinnable_val_->PinSelf(value);
|
|
}
|
|
}
|
|
} else if (kMerge == state_) {
|
|
assert(merge_operator_ != nullptr);
|
|
state_ = kFound;
|
|
if (LIKELY(pinnable_val_ != nullptr)) {
|
|
Status merge_status = MergeHelper::TimedFullMerge(
|
|
merge_operator_, user_key_, &value,
|
|
merge_context_->GetOperands(), pinnable_val_->GetSelf(),
|
|
logger_, statistics_, env_);
|
|
pinnable_val_->PinSelf();
|
|
if (!merge_status.ok()) {
|
|
state_ = kCorrupt;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
|
|
case kTypeDeletion:
|
|
case kTypeSingleDeletion:
|
|
case kTypeRangeDeletion:
|
|
// TODO(noetzli): Verify correctness once merge of single-deletes
|
|
// is supported
|
|
assert(state_ == kNotFound || state_ == kMerge);
|
|
if (kNotFound == state_) {
|
|
state_ = kDeleted;
|
|
} else if (kMerge == state_) {
|
|
state_ = kFound;
|
|
if (LIKELY(pinnable_val_ != nullptr)) {
|
|
Status merge_status = MergeHelper::TimedFullMerge(
|
|
merge_operator_, user_key_, nullptr,
|
|
merge_context_->GetOperands(), pinnable_val_->GetSelf(),
|
|
logger_, statistics_, env_);
|
|
pinnable_val_->PinSelf();
|
|
if (!merge_status.ok()) {
|
|
state_ = kCorrupt;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
|
|
case kTypeMerge:
|
|
assert(state_ == kNotFound || state_ == kMerge);
|
|
state_ = kMerge;
|
|
// value_pinner is not set from plain_table_reader.cc for example.
|
|
if (pinned_iters_mgr() && pinned_iters_mgr()->PinningEnabled() &&
|
|
value_pinner != nullptr) {
|
|
value_pinner->DelegateCleanupsTo(pinned_iters_mgr());
|
|
merge_context_->PushOperand(value, true /*value_pinned*/);
|
|
} else {
|
|
merge_context_->PushOperand(value, false);
|
|
}
|
|
return true;
|
|
|
|
default:
|
|
assert(false);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// state_ could be Corrupt, merge or notfound
|
|
return false;
|
|
}
|
|
|
|
void replayGetContextLog(const Slice& replay_log, const Slice& user_key,
|
|
GetContext* get_context, Cleanable* value_pinner) {
|
|
#ifndef ROCKSDB_LITE
|
|
Slice s = replay_log;
|
|
while (s.size()) {
|
|
auto type = static_cast<ValueType>(*s.data());
|
|
s.remove_prefix(1);
|
|
Slice value;
|
|
bool ret = GetLengthPrefixedSlice(&s, &value);
|
|
assert(ret);
|
|
(void)ret;
|
|
|
|
// Since SequenceNumber is not stored and unknown, we will use
|
|
// kMaxSequenceNumber.
|
|
get_context->SaveValue(
|
|
ParsedInternalKey(user_key, kMaxSequenceNumber, type), value,
|
|
value_pinner);
|
|
}
|
|
#else // ROCKSDB_LITE
|
|
assert(false);
|
|
#endif // ROCKSDB_LITE
|
|
}
|
|
|
|
} // namespace rocksdb
|