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rocksdb/trace_replay/trace_replay.cc

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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 "trace_replay/trace_replay.h"
#include <chrono>
#include <sstream>
#include <thread>
#include "db/db_impl/db_impl.h"
#include "rocksdb/env.h"
#include "rocksdb/iterator.h"
#include "rocksdb/options.h"
#include "rocksdb/slice.h"
#include "rocksdb/system_clock.h"
#include "rocksdb/trace_reader_writer.h"
#include "rocksdb/write_batch.h"
#include "util/coding.h"
#include "util/string_util.h"
namespace ROCKSDB_NAMESPACE {
const std::string kTraceMagic = "feedcafedeadbeef";
namespace {
void DecodeCFAndKey(std::string& buffer, uint32_t* cf_id, Slice* key) {
Slice buf(buffer);
GetFixed32(&buf, cf_id);
GetLengthPrefixedSlice(&buf, key);
}
} // namespace
Status TracerHelper::ParseVersionStr(std::string& v_string, int* v_num) {
if (v_string.find_first_of('.') == std::string::npos ||
v_string.find_first_of('.') != v_string.find_last_of('.')) {
return Status::Corruption(
"Corrupted trace file. Incorrect version format.");
}
int tmp_num = 0;
for (int i = 0; i < static_cast<int>(v_string.size()); i++) {
if (v_string[i] == '.') {
continue;
} else if (isdigit(v_string[i])) {
tmp_num = tmp_num * 10 + (v_string[i] - '0');
} else {
return Status::Corruption(
"Corrupted trace file. Incorrect version format");
}
}
*v_num = tmp_num;
return Status::OK();
}
Status TracerHelper::ParseTraceHeader(const Trace& header, int* trace_version,
int* db_version) {
std::vector<std::string> s_vec;
int begin = 0, end;
for (int i = 0; i < 3; i++) {
assert(header.payload.find("\t", begin) != std::string::npos);
end = static_cast<int>(header.payload.find("\t", begin));
s_vec.push_back(header.payload.substr(begin, end - begin));
begin = end + 1;
}
std::string t_v_str, db_v_str;
assert(s_vec.size() == 3);
assert(s_vec[1].find("Trace Version: ") != std::string::npos);
t_v_str = s_vec[1].substr(15);
assert(s_vec[2].find("RocksDB Version: ") != std::string::npos);
db_v_str = s_vec[2].substr(17);
Status s;
s = ParseVersionStr(t_v_str, trace_version);
if (s != Status::OK()) {
return s;
}
s = ParseVersionStr(db_v_str, db_version);
return s;
}
void TracerHelper::EncodeTrace(const Trace& trace, std::string* encoded_trace) {
assert(encoded_trace);
PutFixed64(encoded_trace, trace.ts);
encoded_trace->push_back(trace.type);
PutFixed32(encoded_trace, static_cast<uint32_t>(trace.payload.size()));
encoded_trace->append(trace.payload);
}
Status TracerHelper::DecodeTrace(const std::string& encoded_trace,
Trace* trace) {
assert(trace != nullptr);
Slice enc_slice = Slice(encoded_trace);
if (!GetFixed64(&enc_slice, &trace->ts)) {
return Status::Incomplete("Decode trace string failed");
}
if (enc_slice.size() < kTraceTypeSize + kTracePayloadLengthSize) {
return Status::Incomplete("Decode trace string failed");
}
trace->type = static_cast<TraceType>(enc_slice[0]);
enc_slice.remove_prefix(kTraceTypeSize + kTracePayloadLengthSize);
trace->payload = enc_slice.ToString();
return Status::OK();
}
Status TracerHelper::DecodeHeader(const std::string& encoded_trace,
Trace* header) {
Status s = TracerHelper::DecodeTrace(encoded_trace, header);
if (header->type != kTraceBegin) {
return Status::Corruption("Corrupted trace file. Incorrect header.");
}
if (header->payload.substr(0, kTraceMagic.length()) != kTraceMagic) {
return Status::Corruption("Corrupted trace file. Incorrect magic.");
}
return s;
}
bool TracerHelper::SetPayloadMap(uint64_t& payload_map,
const TracePayloadType payload_type) {
uint64_t old_state = payload_map;
uint64_t tmp = 1;
payload_map |= (tmp << payload_type);
return old_state != payload_map;
}
Status TracerHelper::DecodeTraceRecord(Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record) {
assert(trace != nullptr);
if (record != nullptr) {
record->reset(nullptr);
}
switch (trace->type) {
// Write
case kTraceWrite: {
PinnableSlice rep;
if (trace_file_version < 2) {
rep.PinSelf(trace->payload);
} else {
Slice buf(trace->payload);
GetFixed64(&buf, &trace->payload_map);
int64_t payload_map = static_cast<int64_t>(trace->payload_map);
Slice write_batch_data;
while (payload_map) {
// Find the rightmost set bit.
uint32_t set_pos =
static_cast<uint32_t>(log2(payload_map & -payload_map));
switch (set_pos) {
case TracePayloadType::kWriteBatchData: {
GetLengthPrefixedSlice(&buf, &write_batch_data);
break;
}
default: {
assert(false);
}
}
// unset the rightmost bit.
payload_map &= (payload_map - 1);
}
rep.PinSelf(write_batch_data);
}
if (record != nullptr) {
record->reset(new WriteQueryTraceRecord(std::move(rep), trace->ts));
}
return Status::OK();
}
// Get
case kTraceGet: {
uint32_t cf_id = 0;
Slice get_key;
if (trace_file_version < 2) {
DecodeCFAndKey(trace->payload, &cf_id, &get_key);
} else {
Slice buf(trace->payload);
GetFixed64(&buf, &trace->payload_map);
int64_t payload_map = static_cast<int64_t>(trace->payload_map);
while (payload_map) {
// Find the rightmost set bit.
uint32_t set_pos =
static_cast<uint32_t>(log2(payload_map & -payload_map));
switch (set_pos) {
case TracePayloadType::kGetCFID: {
GetFixed32(&buf, &cf_id);
break;
}
case TracePayloadType::kGetKey: {
GetLengthPrefixedSlice(&buf, &get_key);
break;
}
default: {
assert(false);
}
}
// unset the rightmost bit.
payload_map &= (payload_map - 1);
}
}
if (record != nullptr) {
PinnableSlice ps;
ps.PinSelf(get_key);
record->reset(new GetQueryTraceRecord(cf_id, std::move(ps), trace->ts));
}
return Status::OK();
}
// Iterator Seek and SeekForPrev
case kTraceIteratorSeek:
case kTraceIteratorSeekForPrev: {
uint32_t cf_id = 0;
Slice iter_key;
Slice lower_bound;
Slice upper_bound;
if (trace_file_version < 2) {
DecodeCFAndKey(trace->payload, &cf_id, &iter_key);
} else {
Slice buf(trace->payload);
GetFixed64(&buf, &trace->payload_map);
int64_t payload_map = static_cast<int64_t>(trace->payload_map);
while (payload_map) {
// Find the rightmost set bit.
uint32_t set_pos =
static_cast<uint32_t>(log2(payload_map & -payload_map));
switch (set_pos) {
case TracePayloadType::kIterCFID: {
GetFixed32(&buf, &cf_id);
break;
}
case TracePayloadType::kIterKey: {
GetLengthPrefixedSlice(&buf, &iter_key);
break;
}
case TracePayloadType::kIterLowerBound: {
GetLengthPrefixedSlice(&buf, &lower_bound);
break;
}
case TracePayloadType::kIterUpperBound: {
GetLengthPrefixedSlice(&buf, &upper_bound);
break;
}
default: {
assert(false);
}
}
// unset the rightmost bit.
payload_map &= (payload_map - 1);
}
}
if (record != nullptr) {
PinnableSlice ps_key;
ps_key.PinSelf(iter_key);
PinnableSlice ps_lower;
ps_lower.PinSelf(lower_bound);
PinnableSlice ps_upper;
ps_upper.PinSelf(upper_bound);
record->reset(new IteratorSeekQueryTraceRecord(
static_cast<IteratorSeekQueryTraceRecord::SeekType>(trace->type),
cf_id, std::move(ps_key), std::move(ps_lower), std::move(ps_upper),
trace->ts));
}
return Status::OK();
}
// MultiGet
case kTraceMultiGet: {
if (trace_file_version < 2) {
return Status::Corruption("MultiGet is not supported.");
}
uint32_t multiget_size = 0;
std::vector<uint32_t> cf_ids;
std::vector<PinnableSlice> multiget_keys;
Slice cfids_payload;
Slice keys_payload;
Slice buf(trace->payload);
GetFixed64(&buf, &trace->payload_map);
int64_t payload_map = static_cast<int64_t>(trace->payload_map);
while (payload_map) {
// Find the rightmost set bit.
uint32_t set_pos =
static_cast<uint32_t>(log2(payload_map & -payload_map));
switch (set_pos) {
case TracePayloadType::kMultiGetSize: {
GetFixed32(&buf, &multiget_size);
break;
}
case TracePayloadType::kMultiGetCFIDs: {
GetLengthPrefixedSlice(&buf, &cfids_payload);
break;
}
case TracePayloadType::kMultiGetKeys: {
GetLengthPrefixedSlice(&buf, &keys_payload);
break;
}
default: {
assert(false);
}
}
// unset the rightmost bit.
payload_map &= (payload_map - 1);
}
if (multiget_size == 0) {
return Status::InvalidArgument("Empty MultiGet cf_ids or keys.");
}
// Decode the cfids_payload and keys_payload
cf_ids.reserve(multiget_size);
multiget_keys.reserve(multiget_size);
for (uint32_t i = 0; i < multiget_size; i++) {
uint32_t tmp_cfid;
Slice tmp_key;
GetFixed32(&cfids_payload, &tmp_cfid);
GetLengthPrefixedSlice(&keys_payload, &tmp_key);
cf_ids.push_back(tmp_cfid);
Slice s(tmp_key);
PinnableSlice ps;
ps.PinSelf(s);
multiget_keys.push_back(std::move(ps));
}
if (record != nullptr) {
record->reset(new MultiGetQueryTraceRecord(
std::move(cf_ids), std::move(multiget_keys), trace->ts));
}
return Status::OK();
}
default:
return Status::NotSupported("Unsupported trace type.");
}
}
Tracer::Tracer(SystemClock* clock, const TraceOptions& trace_options,
std::unique_ptr<TraceWriter>&& trace_writer)
: clock_(clock),
trace_options_(trace_options),
trace_writer_(std::move(trace_writer)),
trace_request_count_(0) {
// TODO: What if this fails?
WriteHeader().PermitUncheckedError();
}
Tracer::~Tracer() { trace_writer_.reset(); }
Status Tracer::Write(WriteBatch* write_batch) {
TraceType trace_type = kTraceWrite;
if (ShouldSkipTrace(trace_type)) {
return Status::OK();
}
Trace trace;
trace.ts = clock_->NowMicros();
trace.type = trace_type;
TracerHelper::SetPayloadMap(trace.payload_map,
TracePayloadType::kWriteBatchData);
PutFixed64(&trace.payload, trace.payload_map);
PutLengthPrefixedSlice(&trace.payload, Slice(write_batch->Data()));
return WriteTrace(trace);
}
Status Tracer::Get(ColumnFamilyHandle* column_family, const Slice& key) {
TraceType trace_type = kTraceGet;
if (ShouldSkipTrace(trace_type)) {
return Status::OK();
}
Trace trace;
trace.ts = clock_->NowMicros();
trace.type = trace_type;
// Set the payloadmap of the struct member that will be encoded in the
// payload.
TracerHelper::SetPayloadMap(trace.payload_map, TracePayloadType::kGetCFID);
TracerHelper::SetPayloadMap(trace.payload_map, TracePayloadType::kGetKey);
// Encode the Get struct members into payload. Make sure add them in order.
PutFixed64(&trace.payload, trace.payload_map);
PutFixed32(&trace.payload, column_family->GetID());
PutLengthPrefixedSlice(&trace.payload, key);
return WriteTrace(trace);
}
Status Tracer::IteratorSeek(const uint32_t& cf_id, const Slice& key,
const Slice& lower_bound, const Slice upper_bound) {
TraceType trace_type = kTraceIteratorSeek;
if (ShouldSkipTrace(trace_type)) {
return Status::OK();
}
Trace trace;
trace.ts = clock_->NowMicros();
trace.type = trace_type;
// Set the payloadmap of the struct member that will be encoded in the
// payload.
TracerHelper::SetPayloadMap(trace.payload_map, TracePayloadType::kIterCFID);
TracerHelper::SetPayloadMap(trace.payload_map, TracePayloadType::kIterKey);
if (lower_bound.size() > 0) {
TracerHelper::SetPayloadMap(trace.payload_map,
TracePayloadType::kIterLowerBound);
}
if (upper_bound.size() > 0) {
TracerHelper::SetPayloadMap(trace.payload_map,
TracePayloadType::kIterUpperBound);
}
// Encode the Iterator struct members into payload. Make sure add them in
// order.
PutFixed64(&trace.payload, trace.payload_map);
PutFixed32(&trace.payload, cf_id);
PutLengthPrefixedSlice(&trace.payload, key);
if (lower_bound.size() > 0) {
PutLengthPrefixedSlice(&trace.payload, lower_bound);
}
if (upper_bound.size() > 0) {
PutLengthPrefixedSlice(&trace.payload, upper_bound);
}
return WriteTrace(trace);
}
Status Tracer::IteratorSeekForPrev(const uint32_t& cf_id, const Slice& key,
const Slice& lower_bound,
const Slice upper_bound) {
TraceType trace_type = kTraceIteratorSeekForPrev;
if (ShouldSkipTrace(trace_type)) {
return Status::OK();
}
Trace trace;
trace.ts = clock_->NowMicros();
trace.type = trace_type;
// Set the payloadmap of the struct member that will be encoded in the
// payload.
TracerHelper::SetPayloadMap(trace.payload_map, TracePayloadType::kIterCFID);
TracerHelper::SetPayloadMap(trace.payload_map, TracePayloadType::kIterKey);
if (lower_bound.size() > 0) {
TracerHelper::SetPayloadMap(trace.payload_map,
TracePayloadType::kIterLowerBound);
}
if (upper_bound.size() > 0) {
TracerHelper::SetPayloadMap(trace.payload_map,
TracePayloadType::kIterUpperBound);
}
// Encode the Iterator struct members into payload. Make sure add them in
// order.
PutFixed64(&trace.payload, trace.payload_map);
PutFixed32(&trace.payload, cf_id);
PutLengthPrefixedSlice(&trace.payload, key);
if (lower_bound.size() > 0) {
PutLengthPrefixedSlice(&trace.payload, lower_bound);
}
if (upper_bound.size() > 0) {
PutLengthPrefixedSlice(&trace.payload, upper_bound);
}
return WriteTrace(trace);
}
Status Tracer::MultiGet(const size_t num_keys,
ColumnFamilyHandle** column_families,
const Slice* keys) {
if (num_keys == 0) {
return Status::OK();
}
std::vector<ColumnFamilyHandle*> v_column_families;
std::vector<Slice> v_keys;
v_column_families.resize(num_keys);
v_keys.resize(num_keys);
for (size_t i = 0; i < num_keys; i++) {
v_column_families[i] = column_families[i];
v_keys[i] = keys[i];
}
return MultiGet(v_column_families, v_keys);
}
Status Tracer::MultiGet(const size_t num_keys,
ColumnFamilyHandle* column_family, const Slice* keys) {
if (num_keys == 0) {
return Status::OK();
}
std::vector<ColumnFamilyHandle*> column_families;
std::vector<Slice> v_keys;
column_families.resize(num_keys);
v_keys.resize(num_keys);
for (size_t i = 0; i < num_keys; i++) {
column_families[i] = column_family;
v_keys[i] = keys[i];
}
return MultiGet(column_families, v_keys);
}
Status Tracer::MultiGet(const std::vector<ColumnFamilyHandle*>& column_families,
const std::vector<Slice>& keys) {
if (column_families.size() != keys.size()) {
return Status::Corruption("the CFs size and keys size does not match!");
}
TraceType trace_type = kTraceMultiGet;
if (ShouldSkipTrace(trace_type)) {
return Status::OK();
}
uint32_t multiget_size = static_cast<uint32_t>(keys.size());
Trace trace;
trace.ts = clock_->NowMicros();
trace.type = trace_type;
// Set the payloadmap of the struct member that will be encoded in the
// payload.
TracerHelper::SetPayloadMap(trace.payload_map,
TracePayloadType::kMultiGetSize);
TracerHelper::SetPayloadMap(trace.payload_map,
TracePayloadType::kMultiGetCFIDs);
TracerHelper::SetPayloadMap(trace.payload_map,
TracePayloadType::kMultiGetKeys);
// Encode the CFIDs inorder
std::string cfids_payload;
std::string keys_payload;
for (uint32_t i = 0; i < multiget_size; i++) {
assert(i < column_families.size());
assert(i < keys.size());
PutFixed32(&cfids_payload, column_families[i]->GetID());
PutLengthPrefixedSlice(&keys_payload, keys[i]);
}
// Encode the Get struct members into payload. Make sure add them in order.
PutFixed64(&trace.payload, trace.payload_map);
PutFixed32(&trace.payload, multiget_size);
PutLengthPrefixedSlice(&trace.payload, cfids_payload);
PutLengthPrefixedSlice(&trace.payload, keys_payload);
return WriteTrace(trace);
}
bool Tracer::ShouldSkipTrace(const TraceType& trace_type) {
if (IsTraceFileOverMax()) {
return true;
}
if ((trace_options_.filter & kTraceFilterGet && trace_type == kTraceGet) ||
(trace_options_.filter & kTraceFilterWrite &&
trace_type == kTraceWrite)) {
return true;
}
++trace_request_count_;
if (trace_request_count_ < trace_options_.sampling_frequency) {
return true;
}
trace_request_count_ = 0;
return false;
}
bool Tracer::IsTraceFileOverMax() {
uint64_t trace_file_size = trace_writer_->GetFileSize();
return (trace_file_size > trace_options_.max_trace_file_size);
}
Status Tracer::WriteHeader() {
std::ostringstream s;
s << kTraceMagic << "\t"
<< "Trace Version: " << kTraceFileMajorVersion << "."
<< kTraceFileMinorVersion << "\t"
<< "RocksDB Version: " << kMajorVersion << "." << kMinorVersion << "\t"
<< "Format: Timestamp OpType Payload\n";
std::string header(s.str());
Trace trace;
trace.ts = clock_->NowMicros();
trace.type = kTraceBegin;
trace.payload = header;
return WriteTrace(trace);
}
Status Tracer::WriteFooter() {
Trace trace;
trace.ts = clock_->NowMicros();
trace.type = kTraceEnd;
TracerHelper::SetPayloadMap(trace.payload_map,
TracePayloadType::kEmptyPayload);
trace.payload = "";
return WriteTrace(trace);
}
Status Tracer::WriteTrace(const Trace& trace) {
std::string encoded_trace;
TracerHelper::EncodeTrace(trace, &encoded_trace);
return trace_writer_->Write(Slice(encoded_trace));
}
Status Tracer::Close() { return WriteFooter(); }
} // namespace ROCKSDB_NAMESPACE
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