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92b4401566
rocksdb/tools/trace_analyzer_tool.cc
Zhichao Cao 7ca1a1f0d8 Fix trace_analyzer potential huge memory wasting due to no valid query analyzed (#4473) 
Summary:
If the query types being analyzed do not appear in the trace, the current trace_analyzer will use 0 as the begin time, which create the time duration from 1970/01/01 to the now time. It will waste huge memory. Fixed by adding the trace_create_time to limit the duration.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4473

Differential Revision: D10246204

Pulled By: zhichao-cao

fbshipit-source-id: 42850b080b2e62f586fe73afd7737c2246d1a8c8
2018-10-10 10:00:00 -07:00

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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
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#ifdef GFLAGS
#ifdef NUMA
#include <numa.h>
#include <numaif.h>
#endif
#ifndef OS_WIN
#include <unistd.h>
#endif
#include <cinttypes>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <memory>
#include <sstream>
#include <stdexcept>
#include "db/db_impl.h"
#include "db/memtable.h"
#include "db/write_batch_internal.h"
#include "options/cf_options.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/iterator.h"
#include "rocksdb/slice.h"
#include "rocksdb/slice_transform.h"
#include "rocksdb/status.h"
#include "rocksdb/table_properties.h"
#include "rocksdb/utilities/ldb_cmd.h"
#include "rocksdb/write_batch.h"
#include "table/meta_blocks.h"
#include "table/plain_table_factory.h"
#include "table/table_reader.h"
#include "tools/trace_analyzer_tool.h"
#include "util/coding.h"
#include "util/compression.h"
#include "util/file_reader_writer.h"
#include "util/gflags_compat.h"
#include "util/random.h"
#include "util/string_util.h"
#include "util/trace_replay.h"
using GFLAGS_NAMESPACE::ParseCommandLineFlags;
using GFLAGS_NAMESPACE::RegisterFlagValidator;
using GFLAGS_NAMESPACE::SetUsageMessage;
DEFINE_string(trace_path, "", "The trace file path.");
DEFINE_string(output_dir, "", "The directory to store the output files.");
DEFINE_string(output_prefix, "trace",
"The prefix used for all the output files.");
DEFINE_bool(output_key_stats, false,
"Output the key access count statistics to file\n"
"for accessed keys:\n"
"file name: <prefix>-<query_type>-<cf_id>-accessed_key_stats.txt\n"
"Format:[cf_id value_size access_keyid access_count]\n"
"for the whole key space keys:\n"
"File name: <prefix>-<query_type>-<cf_id>-whole_key_stats.txt\n"
"Format:[whole_key_space_keyid access_count]");
DEFINE_bool(output_access_count_stats, false,
"Output the access count distribution statistics to file.\n"
"File name: <prefix>-<query_type>-<cf_id>-accessed_"
"key_count_distribution.txt \n"
"Format:[access_count number_of_access_count]");
DEFINE_bool(output_time_series, false,
"Output the access time in second of each key, "
"such that we can have the time series data of the queries \n"
"File name: <prefix>-<query_type>-<cf_id>-time_series.txt\n"
"Format:[type_id time_in_sec access_keyid].");
DEFINE_int32(output_prefix_cut, 0,
"The number of bytes as prefix to cut the keys.\n"
"If it is enabled, it will generate the following:\n"
"For accessed keys:\n"
"File name: <prefix>-<query_type>-<cf_id>-"
"accessed_key_prefix_cut.txt \n"
"Format:[acessed_keyid access_count_of_prefix "
"number_of_keys_in_prefix average_key_access "
"prefix_succ_ratio prefix]\n"
"For whole key space keys:\n"
"File name: <prefix>-<query_type>-<cf_id>"
"-whole_key_prefix_cut.txt\n"
"Format:[start_keyid_in_whole_keyspace prefix]\n"
"if 'output_qps_stats' and 'top_k' are enabled, it will output:\n"
"File name: <prefix>-<query_type>-<cf_id>"
"-accessed_top_k_qps_prefix_cut.txt\n"
"Format:[the_top_ith_qps_time QPS], [prefix qps_of_this_second].");
DEFINE_bool(convert_to_human_readable_trace, false,
"Convert the binary trace file to a human readable txt file "
"for further processing. "
"This file will be extremely large "
"(similar size as the original binary trace file). "
"You can specify 'no_key' to reduce the size, if key is not "
"needed in the next step.\n"
"File name: <prefix>_human_readable_trace.txt\n"
"Format:[type_id cf_id value_size time_in_micorsec <key>].");
DEFINE_bool(output_qps_stats, false,
"Output the query per second(qps) statistics \n"
"For the overall qps, it will contain all qps of each query type. "
"The time is started from the first trace record\n"
"File name: <prefix>_qps_stats.txt\n"
"Format: [qps_type_1 qps_type_2 ...... overall_qps]\n"
"For each cf and query, it will have its own qps output.\n"
"File name: <prefix>-<query_type>-<cf_id>_qps_stats.txt \n"
"Format:[query_count_in_this_second].");
DEFINE_bool(no_print, false, "Do not print out any result");
DEFINE_string(
print_correlation, "",
"intput format: [correlation pairs][.,.]\n"
"Output the query correlations between the pairs of query types "
"listed in the parameter, input should select the operations from:\n"
"get, put, delete, single_delete, rangle_delete, merge. No space "
"between the pairs separated by commar. Example: =[get,get]... "
"It will print out the number of pairs of 'A after B' and "
"the average time interval between the two query.");
DEFINE_string(key_space_dir, "",
"<the directory stores full key space files> \n"
"The key space files should be: <column family id>.txt");
DEFINE_bool(analyze_get, false, "Analyze the Get query.");
DEFINE_bool(analyze_put, false, "Analyze the Put query.");
DEFINE_bool(analyze_delete, false, "Analyze the Delete query.");
DEFINE_bool(analyze_single_delete, false, "Analyze the SingleDelete query.");
DEFINE_bool(analyze_range_delete, false, "Analyze the DeleteRange query.");
DEFINE_bool(analyze_merge, false, "Analyze the Merge query.");
DEFINE_bool(analyze_iterator, false,
" Analyze the iterate query like seek() and seekForPrev().");
DEFINE_bool(no_key, false,
" Does not output the key to the result files to make smaller.");
DEFINE_bool(print_overall_stats, true,
" Print the stats of the whole trace, "
"like total requests, keys, and etc.");
DEFINE_bool(print_key_distribution, false, "Print the key size distribution.");
DEFINE_bool(
output_value_distribution, false,
"Out put the value size distribution, only available for Put and Merge.\n"
"File name: <prefix>-<query_type>-<cf_id>"
"-accessed_value_size_distribution.txt\n"
"Format:[Number_of_value_size_between x and "
"x+value_interval is: <the count>]");
DEFINE_int32(print_top_k_access, 1,
"<top K of the variables to be printed> "
"Print the top k accessed keys, top k accessed prefix "
"and etc.");
DEFINE_int32(output_ignore_count, 0,
"<threshold>, ignores the access count <= this value, "
"it will shorter the output.");
DEFINE_int32(value_interval, 8,
"To output the value distribution, we need to set the value "
"intervals and make the statistic of the value size distribution "
"in different intervals. The default is 8.");
namespace rocksdb {
std::map<std::string, int> taOptToIndex = {
{"get", 0}, {"put", 1},
{"delete", 2}, {"single_delete", 3},
{"range_delete", 4}, {"merge", 5},
{"iterator_Seek", 6}, {"iterator_SeekForPrev", 7}};
std::map<int, std::string> taIndexToOpt = {
{0, "get"}, {1, "put"},
{2, "delete"}, {3, "single_delete"},
{4, "range_delete"}, {5, "merge"},
{6, "iterator_Seek"}, {7, "iterator_SeekForPrev"}};
namespace {
uint64_t MultiplyCheckOverflow(uint64_t op1, uint64_t op2) {
if (op1 == 0 || op2 == 0) {
return 0;
}
if (port::kMaxUint64 / op1 < op2) {
return op1;
}
return (op1 * op2);
}
void DecodeCFAndKeyFromString(std::string& buffer, uint32_t* cf_id, Slice* key) {
Slice buf(buffer);
GetFixed32(&buf, cf_id);
GetLengthPrefixedSlice(&buf, key);
}
} // namespace
// The default constructor of AnalyzerOptions
AnalyzerOptions::AnalyzerOptions()
: correlation_map(kTaTypeNum, std::vector<int>(kTaTypeNum, -1)) {}
AnalyzerOptions::~AnalyzerOptions() {}
void AnalyzerOptions::SparseCorrelationInput(const std::string& in_str) {
std::string cur = in_str;
if (cur.size() == 0) {
return;
}
while (!cur.empty()) {
if (cur.compare(0, 1, "[") != 0) {
fprintf(stderr, "Invalid correlation input: %s\n", in_str.c_str());
exit(1);
}
std::string opt1, opt2;
std::size_t split = cur.find_first_of(",");
if (split != std::string::npos) {
opt1 = cur.substr(1, split - 1);
} else {
fprintf(stderr, "Invalid correlation input: %s\n", in_str.c_str());
exit(1);
}
std::size_t end = cur.find_first_of("]");
if (end != std::string::npos) {
opt2 = cur.substr(split + 1, end - split - 1);
} else {
fprintf(stderr, "Invalid correlation input: %s\n", in_str.c_str());
exit(1);
}
cur = cur.substr(end + 1);
if (taOptToIndex.find(opt1) != taOptToIndex.end() &&
taOptToIndex.find(opt2) != taOptToIndex.end()) {
correlation_list.push_back(
std::make_pair(taOptToIndex[opt1], taOptToIndex[opt2]));
} else {
fprintf(stderr, "Invalid correlation input: %s\n", in_str.c_str());
exit(1);
}
}
int sequence = 0;
for (auto& it : correlation_list) {
correlation_map[it.first][it.second] = sequence;
sequence++;
}
return;
}
// The trace statistic struct constructor
TraceStats::TraceStats() {
cf_id = 0;
cf_name = "0";
a_count = 0;
a_key_id = 0;
a_key_size_sqsum = 0;
a_key_size_sum = 0;
a_key_mid = 0;
a_value_size_sqsum = 0;
a_value_size_sum = 0;
a_value_mid = 0;
a_peak_qps = 0;
a_ave_qps = 0.0;
}
TraceStats::~TraceStats() {}
// The trace analyzer constructor
TraceAnalyzer::TraceAnalyzer(std::string& trace_path, std::string& output_path,
AnalyzerOptions _analyzer_opts)
: trace_name_(trace_path),
output_path_(output_path),
analyzer_opts_(_analyzer_opts) {
rocksdb::EnvOptions env_options;
env_ = rocksdb::Env::Default();
offset_ = 0;
c_time_ = 0;
total_requests_ = 0;
total_access_keys_ = 0;
total_gets_ = 0;
total_writes_ = 0;
trace_create_time_ = 0;
begin_time_ = 0;
end_time_ = 0;
time_series_start_ = 0;
ta_.resize(kTaTypeNum);
ta_[0].type_name = "get";
if (FLAGS_analyze_get) {
ta_[0].enabled = true;
} else {
ta_[0].enabled = false;
}
ta_[1].type_name = "put";
if (FLAGS_analyze_put) {
ta_[1].enabled = true;
} else {
ta_[1].enabled = false;
}
ta_[2].type_name = "delete";
if (FLAGS_analyze_delete) {
ta_[2].enabled = true;
} else {
ta_[2].enabled = false;
}
ta_[3].type_name = "single_delete";
if (FLAGS_analyze_single_delete) {
ta_[3].enabled = true;
} else {
ta_[3].enabled = false;
}
ta_[4].type_name = "range_delete";
if (FLAGS_analyze_range_delete) {
ta_[4].enabled = true;
} else {
ta_[4].enabled = false;
}
ta_[5].type_name = "merge";
if (FLAGS_analyze_merge) {
ta_[5].enabled = true;
} else {
ta_[5].enabled = false;
}
ta_[6].type_name = "iterator_Seek";
if (FLAGS_analyze_iterator) {
ta_[6].enabled = true;
} else {
ta_[6].enabled = false;
}
ta_[7].type_name = "iterator_SeekForPrev";
if (FLAGS_analyze_iterator) {
ta_[7].enabled = true;
} else {
ta_[7].enabled = false;
}
}
TraceAnalyzer::~TraceAnalyzer() {}
// Prepare the processing
// Initiate the global trace reader and writer here
Status TraceAnalyzer::PrepareProcessing() {
Status s;
// Prepare the trace reader
s = NewFileTraceReader(env_, env_options_, trace_name_, &trace_reader_);
if (!s.ok()) {
return s;
}
// Prepare and open the trace sequence file writer if needed
if (FLAGS_convert_to_human_readable_trace) {
std::string trace_sequence_name;
trace_sequence_name =
output_path_ + "/" + FLAGS_output_prefix + "-human_readable_trace.txt";
s = env_->NewWritableFile(trace_sequence_name, &trace_sequence_f_,
env_options_);
if (!s.ok()) {
return s;
}
}
// prepare the general QPS file writer
if (FLAGS_output_qps_stats) {
std::string qps_stats_name;
qps_stats_name =
output_path_ + "/" + FLAGS_output_prefix + "-qps_stats.txt";
s = env_->NewWritableFile(qps_stats_name, &qps_f_, env_options_);
if (!s.ok()) {
return s;
}
}
return Status::OK();
}
Status TraceAnalyzer::ReadTraceHeader(Trace* header) {
assert(header != nullptr);
Status s = ReadTraceRecord(header);
if (!s.ok()) {
return s;
}
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;
}
Status TraceAnalyzer::ReadTraceFooter(Trace* footer) {
assert(footer != nullptr);
Status s = ReadTraceRecord(footer);
if (!s.ok()) {
return s;
}
if (footer->type != kTraceEnd) {
return Status::Corruption("Corrupted trace file. Incorrect footer.");
}
return s;
}
Status TraceAnalyzer::ReadTraceRecord(Trace* trace) {
assert(trace != nullptr);
std::string encoded_trace;
Status s = trace_reader_->Read(&encoded_trace);
if (!s.ok()) {
return s;
}
Slice enc_slice = Slice(encoded_trace);
GetFixed64(&enc_slice, &trace->ts);
trace->type = static_cast<TraceType>(enc_slice[0]);
enc_slice.remove_prefix(kTraceTypeSize + kTracePayloadLengthSize);
trace->payload = enc_slice.ToString();
return s;
}
// process the trace itself and redirect the trace content
// to different operation type handler. With different race
// format, this function can be changed
Status TraceAnalyzer::StartProcessing() {
Status s;
Trace header;
s = ReadTraceHeader(&header);
if (!s.ok()) {
fprintf(stderr, "Cannot read the header\n");
return s;
}
trace_create_time_ = header.ts;
if (FLAGS_output_time_series) {
time_series_start_ = header.ts;
}
Trace trace;
while (s.ok()) {
trace.reset();
s = ReadTraceRecord(&trace);
if (!s.ok()) {
break;
}
total_requests_++;
end_time_ = trace.ts;
if (trace.type == kTraceWrite) {
total_writes_++;
c_time_ = trace.ts;
WriteBatch batch(trace.payload);
// Note that, if the write happens in a transaction,
// 'Write' will be called twice, one for Prepare, one for
// Commit. Thus, in the trace, for the same WriteBatch, there
// will be two reords if it is in a transaction. Here, we only
// process the reord that is committed. If write is non-transaction,
// HasBeginPrepare()==false, so we process it normally.
if (batch.HasBeginPrepare() && !batch.HasCommit()) {
continue;
}
TraceWriteHandler write_handler(this);
s = batch.Iterate(&write_handler);
if (!s.ok()) {
fprintf(stderr, "Cannot process the write batch in the trace\n");
return s;
}
} else if (trace.type == kTraceGet) {
uint32_t cf_id = 0;
Slice key;
DecodeCFAndKeyFromString(trace.payload, &cf_id, &key);
total_gets_++;
s = HandleGet(cf_id, key.ToString(), trace.ts, 1);
if (!s.ok()) {
fprintf(stderr, "Cannot process the get in the trace\n");
return s;
}
} else if (trace.type == kTraceIteratorSeek ||
trace.type == kTraceIteratorSeekForPrev) {
uint32_t cf_id = 0;
Slice key;
DecodeCFAndKeyFromString(trace.payload, &cf_id, &key);
s = HandleIter(cf_id, key.ToString(), trace.ts, trace.type);
if (!s.ok()) {
fprintf(stderr, "Cannot process the iterator in the trace\n");
return s;
}
} else if (trace.type == kTraceEnd) {
break;
}
}
if (s.IsIncomplete()) {
// Fix it: Reaching eof returns Incomplete status at the moment.
//
return Status::OK();
}
return s;
}
// After the trace is processed by StartProcessing, the statistic data
// is stored in the map or other in memory data structures. To get the
// other statistic result such as key size distribution, value size
// distribution, these data structures are re-processed here.
Status TraceAnalyzer::MakeStatistics() {
int ret;
Status s;
for (int type = 0; type < kTaTypeNum; type++) {
if (!ta_[type].enabled) {
continue;
}
for (auto& stat : ta_[type].stats) {
stat.second.a_key_id = 0;
for (auto& record : stat.second.a_key_stats) {
record.second.key_id = stat.second.a_key_id;
stat.second.a_key_id++;
if (record.second.access_count <=
static_cast<uint64_t>(FLAGS_output_ignore_count)) {
continue;
}
// Generate the key access count distribution data
if (FLAGS_output_access_count_stats) {
if (stat.second.a_count_stats.find(record.second.access_count) ==
stat.second.a_count_stats.end()) {
stat.second.a_count_stats[record.second.access_count] = 1;
} else {
stat.second.a_count_stats[record.second.access_count]++;
}
}
// Generate the key size distribution data
if (FLAGS_print_key_distribution) {
if (stat.second.a_key_size_stats.find(record.first.size()) ==
stat.second.a_key_size_stats.end()) {
stat.second.a_key_size_stats[record.first.size()] = 1;
} else {
stat.second.a_key_size_stats[record.first.size()]++;
}
}
if (!FLAGS_print_correlation.empty()) {
s = MakeStatisticCorrelation(stat.second, record.second);
if (!s.ok()) {
return s;
}
}
}
// Output the prefix cut or the whole content of the accessed key space
if (FLAGS_output_key_stats || FLAGS_output_prefix_cut > 0) {
s = MakeStatisticKeyStatsOrPrefix(stat.second);
if (!s.ok()) {
return s;
}
}
// output the access count distribution
if (FLAGS_output_access_count_stats && stat.second.a_count_dist_f) {
for (auto& record : stat.second.a_count_stats) {
ret = sprintf(buffer_, "access_count: %" PRIu64 " num: %" PRIu64 "\n",
record.first, record.second);
if (ret < 0) {
return Status::IOError("Format the output failed");
}
std::string printout(buffer_);
s = stat.second.a_count_dist_f->Append(printout);
if (!s.ok()) {
fprintf(stderr, "Write access count distribution file failed\n");
return s;
}
}
}
// find the medium of the key size
uint64_t k_count = 0;
for (auto& record : stat.second.a_key_size_stats) {
k_count += record.second;
if (k_count >= stat.second.a_key_mid) {
stat.second.a_key_mid = record.first;
break;
}
}
// output the value size distribution
uint64_t v_begin = 0, v_end = 0, v_count = 0;
bool get_mid = false;
for (auto& record : stat.second.a_value_size_stats) {
v_begin = v_end;
v_end = (record.first + 1) * FLAGS_value_interval;
v_count += record.second;
if (!get_mid && v_count >= stat.second.a_count / 2) {
stat.second.a_value_mid = (v_begin + v_end) / 2;
get_mid = true;
}
if (FLAGS_output_value_distribution && stat.second.a_value_size_f &&
(type == TraceOperationType::kPut ||
type == TraceOperationType::kMerge)) {
ret = sprintf(buffer_,
"Number_of_value_size_between %" PRIu64 " and %" PRIu64
" is: %" PRIu64 "\n",
v_begin, v_end, record.second);
if (ret < 0) {
return Status::IOError("Format output failed");
}
std::string printout(buffer_);
s = stat.second.a_value_size_f->Append(printout);
if (!s.ok()) {
fprintf(stderr, "Write value size distribution file failed\n");
return s;
}
}
}
}
}
// Make the QPS statistics
if (FLAGS_output_qps_stats) {
s = MakeStatisticQPS();
if (!s.ok()) {
return s;
}
}
return Status::OK();
}
// Process the statistics of the key access and
// prefix of the accessed keys if required
Status TraceAnalyzer::MakeStatisticKeyStatsOrPrefix(TraceStats& stats) {
int ret;
Status s;
std::string prefix = "0";
uint64_t prefix_access = 0;
uint64_t prefix_count = 0;
uint64_t prefix_succ_access = 0;
double prefix_ave_access = 0.0;
stats.a_succ_count = 0;
for (auto& record : stats.a_key_stats) {
// write the key access statistic file
if (!stats.a_key_f) {
return Status::IOError("Failed to open accessed_key_stats file.");
}
stats.a_succ_count += record.second.succ_count;
double succ_ratio = 0.0;
if (record.second.access_count > 0) {
succ_ratio = (static_cast<double>(record.second.succ_count)) /
record.second.access_count;
}
ret = sprintf(buffer_, "%u %zu %" PRIu64 " %" PRIu64 " %f\n",
record.second.cf_id, record.second.value_size,
record.second.key_id, record.second.access_count, succ_ratio);
if (ret < 0) {
return Status::IOError("Format output failed");
}
std::string printout(buffer_);
s = stats.a_key_f->Append(printout);
if (!s.ok()) {
fprintf(stderr, "Write key access file failed\n");
return s;
}
// write the prefix cut of the accessed keys
if (FLAGS_output_prefix_cut > 0 && stats.a_prefix_cut_f) {
if (record.first.compare(0, FLAGS_output_prefix_cut, prefix) != 0) {
std::string prefix_out = rocksdb::LDBCommand::StringToHex(prefix);
if (prefix_count == 0) {
prefix_ave_access = 0.0;
} else {
prefix_ave_access =
(static_cast<double>(prefix_access)) / prefix_count;
}
double prefix_succ_ratio = 0.0;
if (prefix_access > 0) {
prefix_succ_ratio =
(static_cast<double>(prefix_succ_access)) / prefix_access;
}
ret = sprintf(buffer_, "%" PRIu64 " %" PRIu64 " %" PRIu64 " %f %f %s\n",
record.second.key_id, prefix_access, prefix_count,
prefix_ave_access, prefix_succ_ratio, prefix_out.c_str());
if (ret < 0) {
return Status::IOError("Format output failed");
}
std::string pout(buffer_);
s = stats.a_prefix_cut_f->Append(pout);
if (!s.ok()) {
fprintf(stderr, "Write accessed key prefix file failed\n");
return s;
}
// make the top k statistic for the prefix
if (static_cast<int32_t>(stats.top_k_prefix_access.size()) <
FLAGS_print_top_k_access) {
stats.top_k_prefix_access.push(
std::make_pair(prefix_access, prefix_out));
} else {
if (prefix_access > stats.top_k_prefix_access.top().first) {
stats.top_k_prefix_access.pop();
stats.top_k_prefix_access.push(
std::make_pair(prefix_access, prefix_out));
}
}
if (static_cast<int32_t>(stats.top_k_prefix_ave.size()) <
FLAGS_print_top_k_access) {
stats.top_k_prefix_ave.push(
std::make_pair(prefix_ave_access, prefix_out));
} else {
if (prefix_ave_access > stats.top_k_prefix_ave.top().first) {
stats.top_k_prefix_ave.pop();
stats.top_k_prefix_ave.push(
std::make_pair(prefix_ave_access, prefix_out));
}
}
prefix = record.first.substr(0, FLAGS_output_prefix_cut);
prefix_access = 0;
prefix_count = 0;
prefix_succ_access = 0;
}
prefix_access += record.second.access_count;
prefix_count += 1;
prefix_succ_access += record.second.succ_count;
}
}
return Status::OK();
}
// Process the statistics of different query type
// correlations
Status TraceAnalyzer::MakeStatisticCorrelation(TraceStats& stats,
StatsUnit& unit) {
if (stats.correlation_output.size() !=
analyzer_opts_.correlation_list.size()) {
return Status::Corruption("Cannot make the statistic of correlation.");
}
for (int i = 0; i < static_cast<int>(analyzer_opts_.correlation_list.size());
i++) {
if (i >= static_cast<int>(stats.correlation_output.size()) ||
i >= static_cast<int>(unit.v_correlation.size())) {
break;
}
stats.correlation_output[i].first += unit.v_correlation[i].count;
stats.correlation_output[i].second += unit.v_correlation[i].total_ts;
}
return Status::OK();
}
// Process the statistics of QPS
Status TraceAnalyzer::MakeStatisticQPS() {
if(begin_time_ == 0) {
begin_time_ = trace_create_time_;
}
uint32_t duration =
static_cast<uint32_t>((end_time_ - begin_time_) / 1000000);
int ret;
Status s;
std::vector<std::vector<uint32_t>> type_qps(
duration, std::vector<uint32_t>(kTaTypeNum + 1, 0));
std::vector<uint64_t> qps_sum(kTaTypeNum + 1, 0);
std::vector<uint32_t> qps_peak(kTaTypeNum + 1, 0);
qps_ave_.resize(kTaTypeNum + 1);
for (int type = 0; type < kTaTypeNum; type++) {
if (!ta_[type].enabled) {
continue;
}
for (auto& stat : ta_[type].stats) {
uint32_t time_line = 0;
uint64_t cf_qps_sum = 0;
for (auto& time_it : stat.second.a_qps_stats) {
if (time_it.first >= duration) {
continue;
}
type_qps[time_it.first][kTaTypeNum] += time_it.second;
type_qps[time_it.first][type] += time_it.second;
cf_qps_sum += time_it.second;
if (time_it.second > stat.second.a_peak_qps) {
stat.second.a_peak_qps = time_it.second;
}
if (stat.second.a_qps_f) {
while (time_line < time_it.first) {
ret = sprintf(buffer_, "%u\n", 0);
if (ret < 0) {
return Status::IOError("Format the output failed");
}
std::string printout(buffer_);
s = stat.second.a_qps_f->Append(printout);
if (!s.ok()) {
fprintf(stderr, "Write QPS file failed\n");
return s;
}
time_line++;
}
ret = sprintf(buffer_, "%u\n", time_it.second);
if (ret < 0) {
return Status::IOError("Format the output failed");
}
std::string printout(buffer_);
s = stat.second.a_qps_f->Append(printout);
if (!s.ok()) {
fprintf(stderr, "Write QPS file failed\n");
return s;
}
if (time_line == time_it.first) {
time_line++;
}
}
// Process the top k QPS peaks
if (FLAGS_output_prefix_cut > 0) {
if (static_cast<int32_t>(stat.second.top_k_qps_sec.size()) <
FLAGS_print_top_k_access) {
stat.second.top_k_qps_sec.push(
std::make_pair(time_it.second, time_it.first));
} else {
if (stat.second.top_k_qps_sec.size() > 0 &&
stat.second.top_k_qps_sec.top().first < time_it.second) {
stat.second.top_k_qps_sec.pop();
stat.second.top_k_qps_sec.push(
std::make_pair(time_it.second, time_it.first));
}
}
}
}
if (duration == 0) {
stat.second.a_ave_qps = 0;
} else {
stat.second.a_ave_qps = (static_cast<double>(cf_qps_sum)) / duration;
}
// output the prefix of top k access peak
if (FLAGS_output_prefix_cut > 0 && stat.second.a_top_qps_prefix_f) {
while (!stat.second.top_k_qps_sec.empty()) {
ret = sprintf(buffer_, "At time: %u with QPS: %u\n",
stat.second.top_k_qps_sec.top().second,
stat.second.top_k_qps_sec.top().first);
if (ret < 0) {
return Status::IOError("Format the output failed");
}
std::string printout(buffer_);
s = stat.second.a_top_qps_prefix_f->Append(printout);
if (!s.ok()) {
fprintf(stderr, "Write prefix QPS top K file failed\n");
return s;
}
uint32_t qps_time = stat.second.top_k_qps_sec.top().second;
stat.second.top_k_qps_sec.pop();
if (stat.second.a_qps_prefix_stats.find(qps_time) !=
stat.second.a_qps_prefix_stats.end()) {
for (auto& qps_prefix : stat.second.a_qps_prefix_stats[qps_time]) {
std::string qps_prefix_out =
rocksdb::LDBCommand::StringToHex(qps_prefix.first);
ret = sprintf(buffer_, "The prefix: %s Access count: %u\n",
qps_prefix_out.c_str(), qps_prefix.second);
if (ret < 0) {
return Status::IOError("Format the output failed");
}
std::string pout(buffer_);
s = stat.second.a_top_qps_prefix_f->Append(pout);
if (!s.ok()) {
fprintf(stderr, "Write prefix QPS top K file failed\n");
return s;
}
}
}
}
}
}
}
if (qps_f_) {
for (uint32_t i = 0; i < duration; i++) {
for (int type = 0; type <= kTaTypeNum; type++) {
if (type < kTaTypeNum) {
ret = sprintf(buffer_, "%u ", type_qps[i][type]);
} else {
ret = sprintf(buffer_, "%u\n", type_qps[i][type]);
}
if (ret < 0) {
return Status::IOError("Format the output failed");
}
std::string printout(buffer_);
s = qps_f_->Append(printout);
if (!s.ok()) {
return s;
}
qps_sum[type] += type_qps[i][type];
if (type_qps[i][type] > qps_peak[type]) {
qps_peak[type] = type_qps[i][type];
}
}
}
}
qps_peak_ = qps_peak;
for (int type = 0; type <= kTaTypeNum; type++) {
if (duration == 0) {
qps_ave_[type] = 0;
} else {
qps_ave_[type] = (static_cast<double>(qps_sum[type])) / duration;
}
}
return Status::OK();
}
// In reprocessing, if we have the whole key space
// we can output the access count of all keys in a cf
// we can make some statistics of the whole key space
// also, we output the top k accessed keys here
Status TraceAnalyzer::ReProcessing() {
int ret;
Status s;
for (auto& cf_it : cfs_) {
uint32_t cf_id = cf_it.first;
// output the time series;
if (FLAGS_output_time_series) {
for (int type = 0; type < kTaTypeNum; type++) {
if (!ta_[type].enabled ||
ta_[type].stats.find(cf_id) == ta_[type].stats.end()) {
continue;
}
TraceStats& stat = ta_[type].stats[cf_id];
if (!stat.time_series_f) {
fprintf(stderr, "Cannot write time_series of '%s' in '%u'\n",
ta_[type].type_name.c_str(), cf_id);
continue;
}
while (!stat.time_series.empty()) {
uint64_t key_id = 0;
auto found = stat.a_key_stats.find(stat.time_series.front().key);
if (found != stat.a_key_stats.end()) {
key_id = found->second.key_id;
}
ret = sprintf(buffer_, "%u %" PRIu64 " %" PRIu64 "\n",
stat.time_series.front().type,
stat.time_series.front().ts, key_id);
if (ret < 0) {
return Status::IOError("Format the output failed");
}
std::string printout(buffer_);
s = stat.time_series_f->Append(printout);
if (!s.ok()) {
fprintf(stderr, "Write time series file failed\n");
return s;
}
stat.time_series.pop_front();
}
}
}
// process the whole key space if needed
if (!FLAGS_key_space_dir.empty()) {
std::string whole_key_path =
FLAGS_key_space_dir + "/" + std::to_string(cf_id) + ".txt";
std::string input_key, get_key;
std::vector<std::string> prefix(kTaTypeNum);
std::istringstream iss;
bool has_data = true;
s = env_->NewSequentialFile(whole_key_path, &wkey_input_f_, env_options_);
if (!s.ok()) {
fprintf(stderr, "Cannot open the whole key space file of CF: %u\n",
cf_id);
wkey_input_f_.reset();
}
if (wkey_input_f_) {
for (cfs_[cf_id].w_count = 0;
ReadOneLine(&iss, wkey_input_f_.get(), &get_key, &has_data, &s);
++cfs_[cf_id].w_count) {
if (!s.ok()) {
fprintf(stderr, "Read whole key space file failed\n");
return s;
}
input_key = rocksdb::LDBCommand::HexToString(get_key);
for (int type = 0; type < kTaTypeNum; type++) {
if (!ta_[type].enabled) {
continue;
}
TraceStats& stat = ta_[type].stats[cf_id];
if (stat.w_key_f) {
if (stat.a_key_stats.find(input_key) != stat.a_key_stats.end()) {
ret = sprintf(buffer_, "%" PRIu64 " %" PRIu64 "\n",
cfs_[cf_id].w_count,
stat.a_key_stats[input_key].access_count);
if (ret < 0) {
return Status::IOError("Format the output failed");
}
std::string printout(buffer_);
s = stat.w_key_f->Append(printout);
if (!s.ok()) {
fprintf(stderr, "Write whole key space access file failed\n");
return s;
}
}
}
// Output the prefix cut file of the whole key space
if (FLAGS_output_prefix_cut > 0 && stat.w_prefix_cut_f) {
if (input_key.compare(0, FLAGS_output_prefix_cut, prefix[type]) !=
0) {
prefix[type] = input_key.substr(0, FLAGS_output_prefix_cut);
std::string prefix_out =
rocksdb::LDBCommand::StringToHex(prefix[type]);
ret = sprintf(buffer_, "%" PRIu64 " %s\n", cfs_[cf_id].w_count,
prefix_out.c_str());
if (ret < 0) {
return Status::IOError("Format the output failed");
}
std::string printout(buffer_);
s = stat.w_prefix_cut_f->Append(printout);
if (!s.ok()) {
fprintf(stderr,
"Write whole key space prefix cut file failed\n");
return s;
}
}
}
}
// Make the statistics fo the key size distribution
if (FLAGS_print_key_distribution) {
if (cfs_[cf_id].w_key_size_stats.find(input_key.size()) ==
cfs_[cf_id].w_key_size_stats.end()) {
cfs_[cf_id].w_key_size_stats[input_key.size()] = 1;
} else {
cfs_[cf_id].w_key_size_stats[input_key.size()]++;
}
}
}
}
}
// process the top k accessed keys
if (FLAGS_print_top_k_access > 0) {
for (int type = 0; type < kTaTypeNum; type++) {
if (!ta_[type].enabled ||
ta_[type].stats.find(cf_id) == ta_[type].stats.end()) {
continue;
}
TraceStats& stat = ta_[type].stats[cf_id];
for (auto& record : stat.a_key_stats) {
if (static_cast<int32_t>(stat.top_k_queue.size()) <
FLAGS_print_top_k_access) {
stat.top_k_queue.push(
std::make_pair(record.second.access_count, record.first));
} else {
if (record.second.access_count > stat.top_k_queue.top().first) {
stat.top_k_queue.pop();
stat.top_k_queue.push(
std::make_pair(record.second.access_count, record.first));
}
}
}
}
}
}
return Status::OK();
}
// End the processing, print the requested results
Status TraceAnalyzer::EndProcessing() {
if (trace_sequence_f_) {
trace_sequence_f_->Close();
}
if (FLAGS_no_print) {
return Status::OK();
}
PrintStatistics();
CloseOutputFiles();
return Status::OK();
}
// Insert the corresponding key statistics to the correct type
// and correct CF, output the time-series file if needed
Status TraceAnalyzer::KeyStatsInsertion(const uint32_t& type,
const uint32_t& cf_id,
const std::string& key,
const size_t value_size,
const uint64_t ts) {
Status s;
StatsUnit unit;
unit.key_id = 0;
unit.cf_id = cf_id;
unit.value_size = value_size;
unit.access_count = 1;
unit.latest_ts = ts;
if (type != TraceOperationType::kGet || value_size > 0) {
unit.succ_count = 1;
} else {
unit.succ_count = 0;
}
unit.v_correlation.resize(analyzer_opts_.correlation_list.size());
for (int i = 0;
i < (static_cast<int>(analyzer_opts_.correlation_list.size())); i++) {
unit.v_correlation[i].count = 0;
unit.v_correlation[i].total_ts = 0;
}
std::string prefix;
if (FLAGS_output_prefix_cut > 0) {
prefix = key.substr(0, FLAGS_output_prefix_cut);
}
if (begin_time_ == 0) {
begin_time_ = ts;
}
uint32_t time_in_sec;
if (ts < begin_time_) {
time_in_sec = 0;
} else {
time_in_sec = static_cast<uint32_t>((ts - begin_time_) / 1000000);
}
uint64_t dist_value_size = value_size / FLAGS_value_interval;
auto found_stats = ta_[type].stats.find(cf_id);
if (found_stats == ta_[type].stats.end()) {
ta_[type].stats[cf_id].cf_id = cf_id;
ta_[type].stats[cf_id].cf_name = std::to_string(cf_id);
ta_[type].stats[cf_id].a_count = 1;
ta_[type].stats[cf_id].a_key_id = 0;
ta_[type].stats[cf_id].a_key_size_sqsum = MultiplyCheckOverflow(
static_cast<uint64_t>(key.size()), static_cast<uint64_t>(key.size()));
ta_[type].stats[cf_id].a_key_size_sum = key.size();
ta_[type].stats[cf_id].a_value_size_sqsum = MultiplyCheckOverflow(
static_cast<uint64_t>(value_size), static_cast<uint64_t>(value_size));
ta_[type].stats[cf_id].a_value_size_sum = value_size;
s = OpenStatsOutputFiles(ta_[type].type_name, ta_[type].stats[cf_id]);
if (!FLAGS_print_correlation.empty()) {
s = StatsUnitCorrelationUpdate(unit, type, ts, key);
}
ta_[type].stats[cf_id].a_key_stats[key] = unit;
ta_[type].stats[cf_id].a_value_size_stats[dist_value_size] = 1;
ta_[type].stats[cf_id].a_qps_stats[time_in_sec] = 1;
ta_[type].stats[cf_id].correlation_output.resize(
analyzer_opts_.correlation_list.size());
if (FLAGS_output_prefix_cut > 0) {
std::map<std::string, uint32_t> tmp_qps_map;
tmp_qps_map[prefix] = 1;
ta_[type].stats[cf_id].a_qps_prefix_stats[time_in_sec] = tmp_qps_map;
}
} else {
found_stats->second.a_count++;
found_stats->second.a_key_size_sqsum += MultiplyCheckOverflow(
static_cast<uint64_t>(key.size()), static_cast<uint64_t>(key.size()));
found_stats->second.a_key_size_sum += key.size();
found_stats->second.a_value_size_sqsum += MultiplyCheckOverflow(
static_cast<uint64_t>(value_size), static_cast<uint64_t>(value_size));
found_stats->second.a_value_size_sum += value_size;
auto found_key = found_stats->second.a_key_stats.find(key);
if (found_key == found_stats->second.a_key_stats.end()) {
found_stats->second.a_key_stats[key] = unit;
} else {
found_key->second.access_count++;
if (type != TraceOperationType::kGet || value_size > 0) {
found_key->second.succ_count++;
}
if (!FLAGS_print_correlation.empty()) {
s = StatsUnitCorrelationUpdate(found_key->second, type, ts, key);
}
}
auto found_value =
found_stats->second.a_value_size_stats.find(dist_value_size);
if (found_value == found_stats->second.a_value_size_stats.end()) {
found_stats->second.a_value_size_stats[dist_value_size] = 1;
} else {
found_value->second++;
}
auto found_qps = found_stats->second.a_qps_stats.find(time_in_sec);
if (found_qps == found_stats->second.a_qps_stats.end()) {
found_stats->second.a_qps_stats[time_in_sec] = 1;
} else {
found_qps->second++;
}
if (FLAGS_output_prefix_cut > 0) {
auto found_qps_prefix =
found_stats->second.a_qps_prefix_stats.find(time_in_sec);
if (found_qps_prefix == found_stats->second.a_qps_prefix_stats.end()) {
std::map<std::string, uint32_t> tmp_qps_map;
found_stats->second.a_qps_prefix_stats[time_in_sec] = tmp_qps_map;
}
if (found_stats->second.a_qps_prefix_stats[time_in_sec].find(prefix) ==
found_stats->second.a_qps_prefix_stats[time_in_sec].end()) {
found_stats->second.a_qps_prefix_stats[time_in_sec][prefix] = 1;
} else {
found_stats->second.a_qps_prefix_stats[time_in_sec][prefix]++;
}
}
}
if (cfs_.find(cf_id) == cfs_.end()) {
CfUnit cf_unit;
cf_unit.cf_id = cf_id;
cf_unit.w_count = 0;
cf_unit.a_count = 0;
cfs_[cf_id] = cf_unit;
}
if (FLAGS_output_time_series) {
TraceUnit trace_u;
trace_u.type = type;
trace_u.key = key;
trace_u.value_size = value_size;
trace_u.ts = (ts - time_series_start_) / 1000000;
trace_u.cf_id = cf_id;
ta_[type].stats[cf_id].time_series.push_back(trace_u);
}
return Status::OK();
}
// Update the correlation unit of each key if enabled
Status TraceAnalyzer::StatsUnitCorrelationUpdate(StatsUnit& unit,
const uint32_t& type_second,
const uint64_t& ts,
const std::string& key) {
if (type_second >= kTaTypeNum) {
fprintf(stderr, "Unknown Type Id: %u\n", type_second);
return Status::NotFound();
}
for (int type_first = 0; type_first < kTaTypeNum; type_first++) {
if (type_first >= static_cast<int>(ta_.size()) ||
type_first >= static_cast<int>(analyzer_opts_.correlation_map.size())) {
break;
}
if (analyzer_opts_.correlation_map[type_first][type_second] < 0 ||
ta_[type_first].stats.find(unit.cf_id) == ta_[type_first].stats.end() ||
ta_[type_first].stats[unit.cf_id].a_key_stats.find(key) ==
ta_[type_first].stats[unit.cf_id].a_key_stats.end() ||
ta_[type_first].stats[unit.cf_id].a_key_stats[key].latest_ts == ts) {
continue;
}
int correlation_id =
analyzer_opts_.correlation_map[type_first][type_second];
// after get the x-y operation time or x, update;
if (correlation_id < 0 ||
correlation_id >= static_cast<int>(unit.v_correlation.size())) {
continue;
}
unit.v_correlation[correlation_id].count++;
unit.v_correlation[correlation_id].total_ts +=
(ts - ta_[type_first].stats[unit.cf_id].a_key_stats[key].latest_ts);
}
unit.latest_ts = ts;
return Status::OK();
}
// when a new trace statistic is created, the file handler
// pointers should be initiated if needed according to
// the trace analyzer options
Status TraceAnalyzer::OpenStatsOutputFiles(const std::string& type,
TraceStats& new_stats) {
Status s;
if (FLAGS_output_key_stats) {
s = CreateOutputFile(type, new_stats.cf_name, "accessed_key_stats.txt",
&new_stats.a_key_f);
if (!FLAGS_key_space_dir.empty()) {
s = CreateOutputFile(type, new_stats.cf_name, "whole_key_stats.txt",
&new_stats.w_key_f);
}
}
if (FLAGS_output_access_count_stats) {
s = CreateOutputFile(type, new_stats.cf_name,
"accessed_key_count_distribution.txt",
&new_stats.a_count_dist_f);
}
if (FLAGS_output_prefix_cut > 0) {
s = CreateOutputFile(type, new_stats.cf_name, "accessed_key_prefix_cut.txt",
&new_stats.a_prefix_cut_f);
if (!FLAGS_key_space_dir.empty()) {
s = CreateOutputFile(type, new_stats.cf_name, "whole_key_prefix_cut.txt",
&new_stats.w_prefix_cut_f);
}
if (FLAGS_output_qps_stats) {
s = CreateOutputFile(type, new_stats.cf_name,
"accessed_top_k_qps_prefix_cut.txt",
&new_stats.a_top_qps_prefix_f);
}
}
if (FLAGS_output_time_series) {
s = CreateOutputFile(type, new_stats.cf_name, "time_series.txt",
&new_stats.time_series_f);
}
if (FLAGS_output_value_distribution) {
s = CreateOutputFile(type, new_stats.cf_name,
"accessed_value_size_distribution.txt",
&new_stats.a_value_size_f);
}
if (FLAGS_output_qps_stats) {
s = CreateOutputFile(type, new_stats.cf_name, "qps_stats.txt",
&new_stats.a_qps_f);
}
return Status::OK();
}
// create the output path of the files to be opened
Status TraceAnalyzer::CreateOutputFile(
const std::string& type, const std::string& cf_name,
const std::string& ending, std::unique_ptr<rocksdb::WritableFile>* f_ptr) {
std::string path;
path = output_path_ + "/" + FLAGS_output_prefix + "-" + type + "-" + cf_name +
"-" + ending;
Status s;
s = env_->NewWritableFile(path, f_ptr, env_options_);
if (!s.ok()) {
fprintf(stderr, "Cannot open file: %s\n", path.c_str());
exit(1);
}
return Status::OK();
}
// Close the output files in the TraceStats if they are opened
void TraceAnalyzer::CloseOutputFiles() {
for (int type = 0; type < kTaTypeNum; type++) {
if (!ta_[type].enabled) {
continue;
}
for (auto& stat : ta_[type].stats) {
if (stat.second.time_series_f) {
stat.second.time_series_f->Close();
}
if (stat.second.a_key_f) {
stat.second.a_key_f->Close();
}
if (stat.second.a_count_dist_f) {
stat.second.a_count_dist_f->Close();
}
if (stat.second.a_prefix_cut_f) {
stat.second.a_prefix_cut_f->Close();
}
if (stat.second.a_value_size_f) {
stat.second.a_value_size_f->Close();
}
if (stat.second.a_qps_f) {
stat.second.a_qps_f->Close();
}
if (stat.second.a_top_qps_prefix_f) {
stat.second.a_top_qps_prefix_f->Close();
}
if (stat.second.w_key_f) {
stat.second.w_key_f->Close();
}
if (stat.second.w_prefix_cut_f) {
stat.second.w_prefix_cut_f->Close();
}
}
}
return;
}
// Handle the Get request in the trace
Status TraceAnalyzer::HandleGet(uint32_t column_family_id,
const std::string& key, const uint64_t& ts,
const uint32_t& get_ret) {
Status s;
size_t value_size = 0;
if (FLAGS_convert_to_human_readable_trace && trace_sequence_f_) {
s = WriteTraceSequence(TraceOperationType::kGet, column_family_id, key,
value_size, ts);
if (!s.ok()) {
return Status::Corruption("Failed to write the trace sequence to file");
}
}
if (!ta_[TraceOperationType::kGet].enabled) {
return Status::OK();
}
if (get_ret == 1) {
value_size = 10;
}
s = KeyStatsInsertion(TraceOperationType::kGet, column_family_id, key,
value_size, ts);
if (!s.ok()) {
return Status::Corruption("Failed to insert key statistics");
}
return s;
}
// Handle the Put request in the write batch of the trace
Status TraceAnalyzer::HandlePut(uint32_t column_family_id, const Slice& key,
const Slice& value) {
Status s;
size_t value_size = value.ToString().size();
if (FLAGS_convert_to_human_readable_trace && trace_sequence_f_) {
s = WriteTraceSequence(TraceOperationType::kPut, column_family_id,
key.ToString(), value_size, c_time_);
if (!s.ok()) {
return Status::Corruption("Failed to write the trace sequence to file");
}
}
if (!ta_[TraceOperationType::kPut].enabled) {
return Status::OK();
}
s = KeyStatsInsertion(TraceOperationType::kPut, column_family_id,
key.ToString(), value_size, c_time_);
if (!s.ok()) {
return Status::Corruption("Failed to insert key statistics");
}
return s;
}
// Handle the Delete request in the write batch of the trace
Status TraceAnalyzer::HandleDelete(uint32_t column_family_id,
const Slice& key) {
Status s;
size_t value_size = 0;
if (FLAGS_convert_to_human_readable_trace && trace_sequence_f_) {
s = WriteTraceSequence(TraceOperationType::kDelete, column_family_id,
key.ToString(), value_size, c_time_);
if (!s.ok()) {
return Status::Corruption("Failed to write the trace sequence to file");
}
}
if (!ta_[TraceOperationType::kDelete].enabled) {
return Status::OK();
}
s = KeyStatsInsertion(TraceOperationType::kDelete, column_family_id,
key.ToString(), value_size, c_time_);
if (!s.ok()) {
return Status::Corruption("Failed to insert key statistics");
}
return s;
}
// Handle the SingleDelete request in the write batch of the trace
Status TraceAnalyzer::HandleSingleDelete(uint32_t column_family_id,
const Slice& key) {
Status s;
size_t value_size = 0;
if (FLAGS_convert_to_human_readable_trace && trace_sequence_f_) {
s = WriteTraceSequence(TraceOperationType::kSingleDelete, column_family_id,
key.ToString(), value_size, c_time_);
if (!s.ok()) {
return Status::Corruption("Failed to write the trace sequence to file");
}
}
if (!ta_[TraceOperationType::kSingleDelete].enabled) {
return Status::OK();
}
s = KeyStatsInsertion(TraceOperationType::kSingleDelete, column_family_id,
key.ToString(), value_size, c_time_);
if (!s.ok()) {
return Status::Corruption("Failed to insert key statistics");
}
return s;
}
// Handle the DeleteRange request in the write batch of the trace
Status TraceAnalyzer::HandleDeleteRange(uint32_t column_family_id,
const Slice& begin_key,
const Slice& end_key) {
Status s;
size_t value_size = 0;
if (FLAGS_convert_to_human_readable_trace && trace_sequence_f_) {
s = WriteTraceSequence(TraceOperationType::kRangeDelete, column_family_id,
begin_key.ToString(), value_size, c_time_);
if (!s.ok()) {
return Status::Corruption("Failed to write the trace sequence to file");
}
}
if (!ta_[TraceOperationType::kRangeDelete].enabled) {
return Status::OK();
}
s = KeyStatsInsertion(TraceOperationType::kRangeDelete, column_family_id,
begin_key.ToString(), value_size, c_time_);
s = KeyStatsInsertion(TraceOperationType::kRangeDelete, column_family_id,
end_key.ToString(), value_size, c_time_);
if (!s.ok()) {
return Status::Corruption("Failed to insert key statistics");
}
return s;
}
// Handle the Merge request in the write batch of the trace
Status TraceAnalyzer::HandleMerge(uint32_t column_family_id, const Slice& key,
const Slice& value) {
Status s;
size_t value_size = value.ToString().size();
if (FLAGS_convert_to_human_readable_trace && trace_sequence_f_) {
s = WriteTraceSequence(TraceOperationType::kMerge, column_family_id,
key.ToString(), value_size, c_time_);
if (!s.ok()) {
return Status::Corruption("Failed to write the trace sequence to file");
}
}
if (!ta_[TraceOperationType::kMerge].enabled) {
return Status::OK();
}
s = KeyStatsInsertion(TraceOperationType::kMerge, column_family_id,
key.ToString(), value_size, c_time_);
if (!s.ok()) {
return Status::Corruption("Failed to insert key statistics");
}
return s;
}
// Handle the Iterator request in the trace
Status TraceAnalyzer::HandleIter(uint32_t column_family_id,
const std::string& key, const uint64_t& ts,
TraceType& trace_type) {
Status s;
size_t value_size = 0;
int type = -1;
if (trace_type == kTraceIteratorSeek) {
type = TraceOperationType::kIteratorSeek;
} else if (trace_type == kTraceIteratorSeekForPrev) {
type = TraceOperationType::kIteratorSeekForPrev;
} else {
return s;
}
if (type == -1) {
return s;
}
if (FLAGS_convert_to_human_readable_trace && trace_sequence_f_) {
s = WriteTraceSequence(type, column_family_id, key, value_size, ts);
if (!s.ok()) {
return Status::Corruption("Failed to write the trace sequence to file");
}
}
if (!ta_[type].enabled) {
return Status::OK();
}
s = KeyStatsInsertion(type, column_family_id, key, value_size, ts);
if (!s.ok()) {
return Status::Corruption("Failed to insert key statistics");
}
return s;
}
// Before the analyzer is closed, the requested general statistic results are
// printed out here. In current stage, these information are not output to
// the files.
// -----type
// |__cf_id
// |_statistics
void TraceAnalyzer::PrintStatistics() {
for (int type = 0; type < kTaTypeNum; type++) {
if (!ta_[type].enabled) {
continue;
}
ta_[type].total_keys = 0;
ta_[type].total_access = 0;
ta_[type].total_succ_access = 0;
printf("\n################# Operation Type: %s #####################\n",
ta_[type].type_name.c_str());
if (qps_ave_.size() == kTaTypeNum + 1) {
printf("Peak QPS is: %u Average QPS is: %f\n", qps_peak_[type],
qps_ave_[type]);
}
for (auto& stat_it : ta_[type].stats) {
if (stat_it.second.a_count == 0) {
continue;
}
TraceStats& stat = stat_it.second;
uint64_t total_a_keys = static_cast<uint64_t>(stat.a_key_stats.size());
double key_size_ave = 0.0;
double value_size_ave = 0.0;
double key_size_vari = 0.0;
double value_size_vari = 0.0;
if (stat.a_count > 0) {
key_size_ave =
(static_cast<double>(stat.a_key_size_sum)) / stat.a_count;
value_size_ave =
(static_cast<double>(stat.a_value_size_sum)) / stat.a_count;
key_size_vari = std::sqrt((static_cast<double>(stat.a_key_size_sqsum)) /
stat.a_count -
key_size_ave * key_size_ave);
value_size_vari = std::sqrt(
(static_cast<double>(stat.a_value_size_sqsum)) / stat.a_count -
value_size_ave * value_size_ave);
}
if (value_size_ave == 0.0) {
stat.a_value_mid = 0;
}
cfs_[stat.cf_id].a_count += total_a_keys;
ta_[type].total_keys += total_a_keys;
ta_[type].total_access += stat.a_count;
ta_[type].total_succ_access += stat.a_succ_count;
printf("*********************************************************\n");
printf("colume family id: %u\n", stat.cf_id);
printf("Total unique keys in this cf: %" PRIu64 "\n", total_a_keys);
printf("Average key size: %f key size medium: %" PRIu64
" Key size Variation: %f\n",
key_size_ave, stat.a_key_mid, key_size_vari);
if (type == kPut || type == kMerge) {
printf("Average value size: %f Value size medium: %" PRIu64
" Value size variation: %f\n",
value_size_ave, stat.a_value_mid, value_size_vari);
}
printf("Peak QPS is: %u Average QPS is: %f\n", stat.a_peak_qps,
stat.a_ave_qps);
// print the top k accessed key and its access count
if (FLAGS_print_top_k_access > 0) {
printf("The Top %d keys that are accessed:\n",
FLAGS_print_top_k_access);
while (!stat.top_k_queue.empty()) {
std::string hex_key =
rocksdb::LDBCommand::StringToHex(stat.top_k_queue.top().second);
printf("Access_count: %" PRIu64 " %s\n", stat.top_k_queue.top().first,
hex_key.c_str());
stat.top_k_queue.pop();
}
}
// print the top k access prefix range and
// top k prefix range with highest average access per key
if (FLAGS_output_prefix_cut > 0) {
printf("The Top %d accessed prefix range:\n", FLAGS_print_top_k_access);
while (!stat.top_k_prefix_access.empty()) {
printf("Prefix: %s Access count: %" PRIu64 "\n",
stat.top_k_prefix_access.top().second.c_str(),
stat.top_k_prefix_access.top().first);
stat.top_k_prefix_access.pop();
}
printf("The Top %d prefix with highest access per key:\n",
FLAGS_print_top_k_access);
while (!stat.top_k_prefix_ave.empty()) {
printf("Prefix: %s access per key: %f\n",
stat.top_k_prefix_ave.top().second.c_str(),
stat.top_k_prefix_ave.top().first);
stat.top_k_prefix_ave.pop();
}
}
// print the key size distribution
if (FLAGS_print_key_distribution) {
printf("The key size distribution\n");
for (auto& record : stat.a_key_size_stats) {
printf("key_size %" PRIu64 " nums: %" PRIu64 "\n", record.first,
record.second);
}
}
// print the operation correlations
if (!FLAGS_print_correlation.empty()) {
for (int correlation = 0;
correlation <
static_cast<int>(analyzer_opts_.correlation_list.size());
correlation++) {
printf(
"The correlation statistics of '%s' after '%s' is:",
taIndexToOpt[analyzer_opts_.correlation_list[correlation].second]
.c_str(),
taIndexToOpt[analyzer_opts_.correlation_list[correlation].first]
.c_str());
double correlation_ave = 0.0;
if (stat.correlation_output[correlation].first > 0) {
correlation_ave =
(static_cast<double>(
stat.correlation_output[correlation].second)) /
(stat.correlation_output[correlation].first * 1000);
}
printf(" total numbers: %" PRIu64 " average time: %f(ms)\n",
stat.correlation_output[correlation].first, correlation_ave);
}
}
}
printf("*********************************************************\n");
printf("Total keys of '%s' is: %" PRIu64 "\n", ta_[type].type_name.c_str(),
ta_[type].total_keys);
printf("Total access is: %" PRIu64 "\n", ta_[type].total_access);
total_access_keys_ += ta_[type].total_keys;
}
// Print the overall statistic information of the trace
printf("\n*********************************************************\n");
printf("*********************************************************\n");
printf("The column family based statistics\n");
for (auto& cf : cfs_) {
printf("The column family id: %u\n", cf.first);
printf("The whole key space key numbers: %" PRIu64 "\n", cf.second.w_count);
printf("The accessed key space key numbers: %" PRIu64 "\n",
cf.second.a_count);
}
if (FLAGS_print_overall_stats) {
printf("\n*********************************************************\n");
printf("*********************************************************\n");
if (qps_peak_.size() == kTaTypeNum + 1) {
printf("Average QPS per second: %f Peak QPS: %u\n", qps_ave_[kTaTypeNum],
qps_peak_[kTaTypeNum]);
}
printf("Total_requests: %" PRIu64 " Total_accessed_keys: %" PRIu64
" Total_gets: %" PRIu64 " Total_write_batch: %" PRIu64 "\n",
total_requests_, total_access_keys_, total_gets_, total_writes_);
for (int type = 0; type < kTaTypeNum; type++) {
if (!ta_[type].enabled) {
continue;
}
printf("Operation: '%s' has: %" PRIu64 "\n", ta_[type].type_name.c_str(),
ta_[type].total_access);
}
}
}
// Write the trace sequence to file
Status TraceAnalyzer::WriteTraceSequence(const uint32_t& type,
const uint32_t& cf_id,
const std::string& key,
const size_t value_size,
const uint64_t ts) {
std::string hex_key = rocksdb::LDBCommand::StringToHex(key);
int ret;
ret =
sprintf(buffer_, "%u %u %zu %" PRIu64 "\n", type, cf_id, value_size, ts);
if (ret < 0) {
return Status::IOError("failed to format the output");
}
std::string printout(buffer_);
if (!FLAGS_no_key) {
printout = hex_key + " " + printout;
}
return trace_sequence_f_->Append(printout);
}
// The entrance function of Trace_Analyzer
int trace_analyzer_tool(int argc, char** argv) {
std::string trace_path;
std::string output_path;
AnalyzerOptions analyzer_opts;
ParseCommandLineFlags(&argc, &argv, true);
if (!FLAGS_print_correlation.empty()) {
analyzer_opts.SparseCorrelationInput(FLAGS_print_correlation);
}
std::unique_ptr<TraceAnalyzer> analyzer(
new TraceAnalyzer(FLAGS_trace_path, FLAGS_output_dir, analyzer_opts));
if (!analyzer) {
fprintf(stderr, "Cannot initiate the trace analyzer\n");
exit(1);
}
rocksdb::Status s = analyzer->PrepareProcessing();
if (!s.ok()) {
fprintf(stderr, "%s\n", s.getState());
fprintf(stderr, "Cannot initiate the trace reader\n");
exit(1);
}
s = analyzer->StartProcessing();
if (!s.ok()) {
fprintf(stderr, "%s\n", s.getState());
fprintf(stderr, "Cannot processing the trace\n");
exit(1);
}
s = analyzer->MakeStatistics();
if (!s.ok()) {
fprintf(stderr, "%s\n", s.getState());
analyzer->EndProcessing();
fprintf(stderr, "Cannot make the statistics\n");
exit(1);
}
s = analyzer->ReProcessing();
if (!s.ok()) {
fprintf(stderr, "%s\n", s.getState());
fprintf(stderr, "Cannot re-process the trace for more statistics\n");
analyzer->EndProcessing();
exit(1);
}
s = analyzer->EndProcessing();
if (!s.ok()) {
fprintf(stderr, "%s\n", s.getState());
fprintf(stderr, "Cannot close the trace analyzer\n");
exit(1);
}
return 0;
}
} // namespace rocksdb
#endif // Endif of Gflag
#endif // RocksDB LITE
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