mirror of
https://github.com/ClickHouse/ClickHouse.git
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136 lines
4.0 KiB
C++
136 lines
4.0 KiB
C++
#include <list>
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#include <iostream>
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#include <IO/ReadBufferFromFileDescriptor.h>
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#include <IO/Operators.h>
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#include <Storages/MergeTree/SimpleMergeSelector.h>
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#include <Storages/MergeTree/LevelMergeSelector.h>
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#include <Common/formatReadable.h>
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/** This program tests merge-selecting algorithm.
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* Usage:
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clickhouse-client --query="
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SELECT bytes, now() - modification_time, level, name
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FROM system.parts
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WHERE table = 'visits' AND active AND partition = '201610'" | ./merge_selector2
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*/
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int main(int, char **)
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{
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using namespace DB;
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IMergeSelector::Partitions partitions(1);
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IMergeSelector::PartsInPartition & parts = partitions.back();
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/* SimpleMergeSelector::Settings settings;
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SimpleMergeSelector selector(settings);*/
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LevelMergeSelector::Settings settings;
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LevelMergeSelector selector(settings);
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ReadBufferFromFileDescriptor in(STDIN_FILENO);
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size_t sum_parts_size = 0;
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std::list<std::string> part_names;
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while (!in.eof())
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{
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part_names.emplace_back();
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IMergeSelector::Part part;
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in >> part.size >> "\t" >> part.age >> "\t" >> part.level >> "\t" >> part_names.back() >> "\n";
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part.data = part_names.back().data();
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// part.level = 0;
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parts.emplace_back(part);
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sum_parts_size += part.size;
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}
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size_t total_size_merged = 0;
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size_t sum_size_written = sum_parts_size;
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size_t num_merges = 1;
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size_t age_passed = 0;
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while (parts.size() > 1)
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{
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IMergeSelector::PartsInPartition selected_parts = selector.select(partitions, 100ULL * 1024 * 1024 * 1024);
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if (selected_parts.empty())
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{
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++age_passed;
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for (auto & part : parts)
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++part.age;
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if (age_passed > 60 * 86400)
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break;
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if (age_passed % 86400 == 0)
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std::cout << ".";
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continue;
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}
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std::cout << "Time passed: " << age_passed << '\n';
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size_t sum_merged_size = 0;
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size_t start_index = 0;
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size_t max_level = 0;
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bool in_range = false;
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for (size_t i = 0, size = parts.size(); i < size; ++i)
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{
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if (parts[i].data == selected_parts.front().data)
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{
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std::cout << "\033[1;31m";
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in_range = true;
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start_index = i;
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}
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std::cout << (parts[i].size / 1024) << "_" << parts[i].level;
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if (in_range)
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{
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sum_merged_size += parts[i].size;
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if (parts[i].level > max_level)
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max_level = parts[i].level;
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}
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if (parts[i].data == selected_parts.back().data)
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{
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in_range = false;
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std::cout << "\033[0m";
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}
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std::cout << " ";
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}
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parts[start_index].size = sum_merged_size;
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parts[start_index].level = max_level + 1;
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parts[start_index].age = 0;
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parts.erase(parts.begin() + start_index + 1, parts.begin() + start_index + selected_parts.size());
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std::cout << '\n';
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sum_size_written += sum_merged_size;
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total_size_merged += sum_merged_size;
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++num_merges;
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double time_to_merge = sum_merged_size / (1048576 * 10.0);
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age_passed += time_to_merge;
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for (auto & part : parts)
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part.age += time_to_merge;
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std::cout << "Time passed: " << age_passed << ", num parts: " << parts.size()
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<< ", merged " << selected_parts.size() << " parts, " << formatReadableSizeWithBinarySuffix(sum_merged_size)
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<< ", total written: " << formatReadableSizeWithBinarySuffix(total_size_merged) << '\n';
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}
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std::cout << std::fixed << std::setprecision(2)
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<< "Write amplification: " << static_cast<double>(sum_size_written) / sum_parts_size << "\n"
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<< "Num parts: " << part_names.size() << "\n"
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<< "Num merges: " << num_merges << "\n"
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<< "Tree depth: " << parts.front().level << "\n"
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;
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return 0;
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}
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