rocksdb/utilities/column_aware_encoding_util.cc
Siying Dong 21696ba502 Replace dynamic_cast<>
Summary:
Replace dynamic_cast<> so that users can choose to build with RTTI off, so that they can save several bytes per object, and get tiny more memory available.
Some nontrivial changes:
1. Add Comparator::GetRootComparator() to get around the internal comparator hack
2. Add the two experiemental functions to DB
3. Add TableFactory::GetOptionString() to avoid unnecessary casting to get the option string
4. Since 3 is done, move the parsing option functions for table factory to table factory files too, to be symmetric.
Closes https://github.com/facebook/rocksdb/pull/2645

Differential Revision: D5502723

Pulled By: siying

fbshipit-source-id: fd13cec5601cf68a554d87bfcf056f2ffa5fbf7c
2017-07-28 16:27:16 -07:00

491 lines
18 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/column_aware_encoding_util.h"
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <vector>
#include "include/rocksdb/comparator.h"
#include "include/rocksdb/slice.h"
#include "rocksdb/env.h"
#include "rocksdb/status.h"
#include "table/block_based_table_builder.h"
#include "table/block_based_table_factory.h"
#include "table/format.h"
#include "table/table_reader.h"
#include "util/coding.h"
#include "utilities/col_buf_decoder.h"
#include "utilities/col_buf_encoder.h"
#include "port/port.h"
namespace rocksdb {
ColumnAwareEncodingReader::ColumnAwareEncodingReader(
const std::string& file_path)
: file_name_(file_path),
ioptions_(options_),
internal_comparator_(BytewiseComparator()) {
InitTableReader(file_name_);
}
void ColumnAwareEncodingReader::InitTableReader(const std::string& file_path) {
std::unique_ptr<RandomAccessFile> file;
uint64_t file_size;
options_.env->NewRandomAccessFile(file_path, &file, soptions_);
options_.env->GetFileSize(file_path, &file_size);
file_.reset(new RandomAccessFileReader(std::move(file), file_path));
options_.comparator = &internal_comparator_;
options_.table_factory = std::make_shared<BlockBasedTableFactory>();
std::unique_ptr<TableReader> table_reader;
options_.table_factory->NewTableReader(
TableReaderOptions(ioptions_, soptions_, internal_comparator_,
/*skip_filters=*/false),
std::move(file_), file_size, &table_reader, /*enable_prefetch=*/false);
table_reader_.reset(dynamic_cast<BlockBasedTable*>(table_reader.release()));
}
void ColumnAwareEncodingReader::GetKVPairsFromDataBlocks(
std::vector<KVPairBlock>* kv_pair_blocks) {
table_reader_->GetKVPairsFromDataBlocks(kv_pair_blocks);
}
void ColumnAwareEncodingReader::DecodeBlocks(
const KVPairColDeclarations& kvp_col_declarations, WritableFile* out_file,
const std::vector<std::string>* blocks) {
char* decoded_content_base = new char[16384];
Options options;
ImmutableCFOptions ioptions(options);
for (auto& block : *blocks) {
KVPairColBufDecoders kvp_col_bufs(kvp_col_declarations);
auto& key_col_bufs = kvp_col_bufs.key_col_bufs;
auto& value_col_bufs = kvp_col_bufs.value_col_bufs;
auto& value_checksum_buf = kvp_col_bufs.value_checksum_buf;
auto& slice_final_with_bit = block;
uint32_t format_version = 2;
Slice compression_dict;
BlockContents contents;
const char* content_ptr;
CompressionType type =
(CompressionType)slice_final_with_bit[slice_final_with_bit.size() - 1];
if (type != kNoCompression) {
UncompressBlockContents(slice_final_with_bit.c_str(),
slice_final_with_bit.size() - 1, &contents,
format_version, compression_dict, ioptions);
content_ptr = contents.data.data();
} else {
content_ptr = slice_final_with_bit.data();
}
size_t num_kv_pairs;
const char* header_content_ptr = content_ptr;
num_kv_pairs = DecodeFixed64(header_content_ptr);
header_content_ptr += sizeof(size_t);
size_t num_key_columns = key_col_bufs.size();
size_t num_value_columns = value_col_bufs.size();
std::vector<const char*> key_content_ptr(num_key_columns);
std::vector<const char*> value_content_ptr(num_value_columns);
const char* checksum_content_ptr;
size_t num_columns = num_key_columns + num_value_columns;
const char* col_content_ptr =
header_content_ptr + sizeof(size_t) * num_columns;
// Read headers
for (size_t i = 0; i < num_key_columns; ++i) {
key_content_ptr[i] = col_content_ptr;
key_content_ptr[i] += key_col_bufs[i]->Init(key_content_ptr[i]);
size_t offset;
offset = DecodeFixed64(header_content_ptr);
header_content_ptr += sizeof(size_t);
col_content_ptr += offset;
}
for (size_t i = 0; i < num_value_columns; ++i) {
value_content_ptr[i] = col_content_ptr;
value_content_ptr[i] += value_col_bufs[i]->Init(value_content_ptr[i]);
size_t offset;
offset = DecodeFixed64(header_content_ptr);
header_content_ptr += sizeof(size_t);
col_content_ptr += offset;
}
checksum_content_ptr = col_content_ptr;
checksum_content_ptr += value_checksum_buf->Init(checksum_content_ptr);
// Decode block
char* decoded_content = decoded_content_base;
for (size_t j = 0; j < num_kv_pairs; ++j) {
for (size_t i = 0; i < num_key_columns; ++i) {
key_content_ptr[i] +=
key_col_bufs[i]->Decode(key_content_ptr[i], &decoded_content);
}
for (size_t i = 0; i < num_value_columns; ++i) {
value_content_ptr[i] +=
value_col_bufs[i]->Decode(value_content_ptr[i], &decoded_content);
}
checksum_content_ptr +=
value_checksum_buf->Decode(checksum_content_ptr, &decoded_content);
}
size_t offset = decoded_content - decoded_content_base;
Slice output_content(decoded_content, offset);
if (out_file != nullptr) {
out_file->Append(output_content);
}
}
delete[] decoded_content_base;
}
void ColumnAwareEncodingReader::DecodeBlocksFromRowFormat(
WritableFile* out_file, const std::vector<std::string>* blocks) {
Options options;
ImmutableCFOptions ioptions(options);
for (auto& block : *blocks) {
auto& slice_final_with_bit = block;
uint32_t format_version = 2;
Slice compression_dict;
BlockContents contents;
std::string decoded_content;
CompressionType type =
(CompressionType)slice_final_with_bit[slice_final_with_bit.size() - 1];
if (type != kNoCompression) {
UncompressBlockContents(slice_final_with_bit.c_str(),
slice_final_with_bit.size() - 1, &contents,
format_version, compression_dict, ioptions);
decoded_content = std::string(contents.data.data(), contents.data.size());
} else {
decoded_content = std::move(slice_final_with_bit);
}
if (out_file != nullptr) {
out_file->Append(decoded_content);
}
}
}
void ColumnAwareEncodingReader::DumpDataColumns(
const std::string& filename,
const KVPairColDeclarations& kvp_col_declarations,
const std::vector<KVPairBlock>& kv_pair_blocks) {
KVPairColBufEncoders kvp_col_bufs(kvp_col_declarations);
auto& key_col_bufs = kvp_col_bufs.key_col_bufs;
auto& value_col_bufs = kvp_col_bufs.value_col_bufs;
auto& value_checksum_buf = kvp_col_bufs.value_checksum_buf;
FILE* fp = fopen(filename.c_str(), "w");
size_t block_id = 1;
for (auto& kv_pairs : kv_pair_blocks) {
fprintf(fp, "---------------- Block: %-4" ROCKSDB_PRIszt " ----------------\n", block_id);
for (auto& kv_pair : kv_pairs) {
const auto& key = kv_pair.first;
const auto& value = kv_pair.second;
size_t value_offset = 0;
const char* key_ptr = key.data();
for (auto& buf : key_col_bufs) {
size_t col_size = buf->Append(key_ptr);
std::string tmp_buf(key_ptr, col_size);
Slice col(tmp_buf);
fprintf(fp, "%s ", col.ToString(true).c_str());
key_ptr += col_size;
}
fprintf(fp, "|");
const char* value_ptr = value.data();
for (auto& buf : value_col_bufs) {
size_t col_size = buf->Append(value_ptr);
std::string tmp_buf(value_ptr, col_size);
Slice col(tmp_buf);
fprintf(fp, " %s", col.ToString(true).c_str());
value_ptr += col_size;
value_offset += col_size;
}
if (value_offset < value.size()) {
size_t col_size = value_checksum_buf->Append(value_ptr);
std::string tmp_buf(value_ptr, col_size);
Slice col(tmp_buf);
fprintf(fp, "|%s", col.ToString(true).c_str());
} else {
value_checksum_buf->Append(nullptr);
}
fprintf(fp, "\n");
}
block_id++;
}
fclose(fp);
}
namespace {
void CompressDataBlock(const std::string& output_content, Slice* slice_final,
CompressionType* type, std::string* compressed_output) {
CompressionOptions compression_opts;
uint32_t format_version = 2; // hard-coded version
Slice compression_dict;
*slice_final =
CompressBlock(output_content, compression_opts, type, format_version,
compression_dict, compressed_output);
}
} // namespace
void ColumnAwareEncodingReader::EncodeBlocksToRowFormat(
WritableFile* out_file, CompressionType compression_type,
const std::vector<KVPairBlock>& kv_pair_blocks,
std::vector<std::string>* blocks) {
std::string output_content;
for (auto& kv_pairs : kv_pair_blocks) {
output_content.clear();
std::string last_key;
size_t counter = 0;
const size_t block_restart_interval = 16;
for (auto& kv_pair : kv_pairs) {
const auto& key = kv_pair.first;
const auto& value = kv_pair.second;
Slice last_key_piece(last_key);
size_t shared = 0;
if (counter >= block_restart_interval) {
counter = 0;
} else {
const size_t min_length = std::min(last_key_piece.size(), key.size());
while ((shared < min_length) && last_key_piece[shared] == key[shared]) {
shared++;
}
}
const size_t non_shared = key.size() - shared;
output_content.append(key.c_str() + shared, non_shared);
output_content.append(value);
last_key.resize(shared);
last_key.append(key.data() + shared, non_shared);
counter++;
}
Slice slice_final;
auto type = compression_type;
std::string compressed_output;
CompressDataBlock(output_content, &slice_final, &type, &compressed_output);
if (out_file != nullptr) {
out_file->Append(slice_final);
}
// Add a bit in the end for decoding
std::string slice_final_with_bit(slice_final.data(), slice_final.size());
slice_final_with_bit.append(reinterpret_cast<char*>(&type), 1);
blocks->push_back(
std::string(slice_final_with_bit.data(), slice_final_with_bit.size()));
}
}
Status ColumnAwareEncodingReader::EncodeBlocks(
const KVPairColDeclarations& kvp_col_declarations, WritableFile* out_file,
CompressionType compression_type,
const std::vector<KVPairBlock>& kv_pair_blocks,
std::vector<std::string>* blocks, bool print_column_stat) {
std::vector<size_t> key_col_sizes(
kvp_col_declarations.key_col_declarations->size(), 0);
std::vector<size_t> value_col_sizes(
kvp_col_declarations.value_col_declarations->size(), 0);
size_t value_checksum_size = 0;
for (auto& kv_pairs : kv_pair_blocks) {
KVPairColBufEncoders kvp_col_bufs(kvp_col_declarations);
auto& key_col_bufs = kvp_col_bufs.key_col_bufs;
auto& value_col_bufs = kvp_col_bufs.value_col_bufs;
auto& value_checksum_buf = kvp_col_bufs.value_checksum_buf;
size_t num_kv_pairs = 0;
for (auto& kv_pair : kv_pairs) {
const auto& key = kv_pair.first;
const auto& value = kv_pair.second;
size_t value_offset = 0;
num_kv_pairs++;
const char* key_ptr = key.data();
for (auto& buf : key_col_bufs) {
size_t col_size = buf->Append(key_ptr);
key_ptr += col_size;
}
const char* value_ptr = value.data();
for (auto& buf : value_col_bufs) {
size_t col_size = buf->Append(value_ptr);
value_ptr += col_size;
value_offset += col_size;
}
if (value_offset < value.size()) {
value_checksum_buf->Append(value_ptr);
} else {
value_checksum_buf->Append(nullptr);
}
}
kvp_col_bufs.Finish();
// Get stats
// Compress and write a block
if (print_column_stat) {
for (size_t i = 0; i < key_col_bufs.size(); ++i) {
Slice slice_final;
auto type = compression_type;
std::string compressed_output;
CompressDataBlock(key_col_bufs[i]->GetData(), &slice_final, &type,
&compressed_output);
out_file->Append(slice_final);
key_col_sizes[i] += slice_final.size();
}
for (size_t i = 0; i < value_col_bufs.size(); ++i) {
Slice slice_final;
auto type = compression_type;
std::string compressed_output;
CompressDataBlock(value_col_bufs[i]->GetData(), &slice_final, &type,
&compressed_output);
out_file->Append(slice_final);
value_col_sizes[i] += slice_final.size();
}
Slice slice_final;
auto type = compression_type;
std::string compressed_output;
CompressDataBlock(value_checksum_buf->GetData(), &slice_final, &type,
&compressed_output);
out_file->Append(slice_final);
value_checksum_size += slice_final.size();
} else {
std::string output_content;
// Write column sizes
PutFixed64(&output_content, num_kv_pairs);
for (auto& buf : key_col_bufs) {
size_t size = buf->GetData().size();
PutFixed64(&output_content, size);
}
for (auto& buf : value_col_bufs) {
size_t size = buf->GetData().size();
PutFixed64(&output_content, size);
}
// Write data
for (auto& buf : key_col_bufs) {
output_content.append(buf->GetData());
}
for (auto& buf : value_col_bufs) {
output_content.append(buf->GetData());
}
output_content.append(value_checksum_buf->GetData());
Slice slice_final;
auto type = compression_type;
std::string compressed_output;
CompressDataBlock(output_content, &slice_final, &type,
&compressed_output);
if (out_file != nullptr) {
out_file->Append(slice_final);
}
// Add a bit in the end for decoding
std::string slice_final_with_bit(slice_final.data(),
slice_final.size() + 1);
slice_final_with_bit[slice_final.size()] = static_cast<char>(type);
blocks->push_back(std::string(slice_final_with_bit.data(),
slice_final_with_bit.size()));
}
}
if (print_column_stat) {
size_t total_size = 0;
for (size_t i = 0; i < key_col_sizes.size(); ++i)
total_size += key_col_sizes[i];
for (size_t i = 0; i < value_col_sizes.size(); ++i)
total_size += value_col_sizes[i];
total_size += value_checksum_size;
for (size_t i = 0; i < key_col_sizes.size(); ++i)
printf("Key col %" ROCKSDB_PRIszt " size: %" ROCKSDB_PRIszt " percentage %lf%%\n", i, key_col_sizes[i],
100.0 * key_col_sizes[i] / total_size);
for (size_t i = 0; i < value_col_sizes.size(); ++i)
printf("Value col %" ROCKSDB_PRIszt " size: %" ROCKSDB_PRIszt " percentage %lf%%\n", i,
value_col_sizes[i], 100.0 * value_col_sizes[i] / total_size);
printf("Value checksum size: %" ROCKSDB_PRIszt " percentage %lf%%\n", value_checksum_size,
100.0 * value_checksum_size / total_size);
}
return Status::OK();
}
void ColumnAwareEncodingReader::GetColDeclarationsPrimary(
std::vector<ColDeclaration>** key_col_declarations,
std::vector<ColDeclaration>** value_col_declarations,
ColDeclaration** value_checksum_declaration) {
*key_col_declarations = new std::vector<ColDeclaration>{
ColDeclaration("FixedLength", ColCompressionType::kColRleVarint, 4, false,
true),
ColDeclaration("FixedLength", ColCompressionType::kColRleDeltaVarint, 8,
false, true),
ColDeclaration("FixedLength", ColCompressionType::kColDeltaVarint, 8,
false, true),
ColDeclaration("FixedLength", ColCompressionType::kColDeltaVarint, 8,
false, true),
ColDeclaration("FixedLength", ColCompressionType::kColRleVarint, 8)};
*value_col_declarations = new std::vector<ColDeclaration>{
ColDeclaration("FixedLength", ColCompressionType::kColRleVarint, 4),
ColDeclaration("FixedLength", ColCompressionType::kColRleVarint, 4),
ColDeclaration("FixedLength", ColCompressionType::kColRle, 1),
ColDeclaration("VariableLength"),
ColDeclaration("FixedLength", ColCompressionType::kColDeltaVarint, 4),
ColDeclaration("FixedLength", ColCompressionType::kColRleVarint, 8)};
*value_checksum_declaration = new ColDeclaration(
"LongFixedLength", ColCompressionType::kColNoCompression, 9,
true /* nullable */);
}
void ColumnAwareEncodingReader::GetColDeclarationsSecondary(
std::vector<ColDeclaration>** key_col_declarations,
std::vector<ColDeclaration>** value_col_declarations,
ColDeclaration** value_checksum_declaration) {
*key_col_declarations = new std::vector<ColDeclaration>{
ColDeclaration("FixedLength", ColCompressionType::kColRleVarint, 4, false,
true),
ColDeclaration("FixedLength", ColCompressionType::kColDeltaVarint, 8,
false, true),
ColDeclaration("FixedLength", ColCompressionType::kColRleDeltaVarint, 8,
false, true),
ColDeclaration("FixedLength", ColCompressionType::kColRle, 1),
ColDeclaration("FixedLength", ColCompressionType::kColDeltaVarint, 4,
false, true),
ColDeclaration("FixedLength", ColCompressionType::kColDeltaVarint, 8,
false, true),
ColDeclaration("FixedLength", ColCompressionType::kColRleVarint, 8, false,
true),
ColDeclaration("VariableChunk", ColCompressionType::kColNoCompression),
ColDeclaration("FixedLength", ColCompressionType::kColRleVarint, 8)};
*value_col_declarations = new std::vector<ColDeclaration>();
*value_checksum_declaration = new ColDeclaration(
"LongFixedLength", ColCompressionType::kColNoCompression, 9,
true /* nullable */);
}
} // namespace rocksdb
#endif // ROCKSDB_LITE