ClickHouse/src/Storages/MergeTree/MergeList.cpp

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#include <Storages/MergeTree/MergeList.h>
#include <Storages/MergeTree/MergeTreeDataMergerMutator.h>
#include <Common/CurrentMetrics.h>
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#include <common/getThreadId.h>
#include <Common/CurrentThread.h>
namespace DB
{
MergeListElement::MergeListElement(const StorageID & table_id_, const FutureMergedMutatedPart & future_part)
: table_id{table_id_}
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, partition_id{future_part.part_info.partition_id}
, result_part_name{future_part.name}
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, result_part_path{future_part.path}
, result_data_version{future_part.part_info.getDataVersion()}
, num_parts{future_part.parts.size()}
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, thread_id{getThreadId()}
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, merge_type{future_part.merge_type}
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, merge_algorithm{MergeAlgorithm::Undecided}
{
for (const auto & source_part : future_part.parts)
{
source_part_names.emplace_back(source_part->name);
source_part_paths.emplace_back(source_part->getFullPath());
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total_size_bytes_compressed += source_part->getBytesOnDisk();
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total_size_marks += source_part->getMarksCount();
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total_rows_count += source_part->index_granularity.getTotalRows();
}
if (!future_part.parts.empty())
{
source_data_version = future_part.parts[0]->info.getDataVersion();
is_mutation = (result_data_version != source_data_version);
}
/// Each merge is executed into separate background processing pool thread
background_thread_memory_tracker = CurrentThread::getMemoryTracker();
if (background_thread_memory_tracker)
{
/// From the query context it will be ("for thread") memory tracker with VariableContext::Thread level,
/// which does not have any limits and sampling settings configured.
/// And parent for this memory tracker should be ("(for query)") with VariableContext::Process level,
/// that has limits and sampling configured.
MemoryTracker * parent;
if (background_thread_memory_tracker->level == VariableContext::Thread &&
(parent = background_thread_memory_tracker->getParent()) &&
parent != &total_memory_tracker)
{
background_thread_memory_tracker = parent;
}
background_thread_memory_tracker_prev_parent = background_thread_memory_tracker->getParent();
background_thread_memory_tracker->setParent(&memory_tracker);
}
}
MergeInfo MergeListElement::getInfo() const
{
MergeInfo res;
res.database = table_id.getDatabaseName();
res.table = table_id.getTableName();
res.result_part_name = result_part_name;
res.result_part_path = result_part_path;
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res.partition_id = partition_id;
res.is_mutation = is_mutation;
res.elapsed = watch.elapsedSeconds();
res.progress = progress.load(std::memory_order_relaxed);
res.num_parts = num_parts;
res.total_size_bytes_compressed = total_size_bytes_compressed;
res.total_size_marks = total_size_marks;
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res.total_rows_count = total_rows_count;
res.bytes_read_uncompressed = bytes_read_uncompressed.load(std::memory_order_relaxed);
res.bytes_written_uncompressed = bytes_written_uncompressed.load(std::memory_order_relaxed);
res.rows_read = rows_read.load(std::memory_order_relaxed);
res.rows_written = rows_written.load(std::memory_order_relaxed);
res.columns_written = columns_written.load(std::memory_order_relaxed);
res.memory_usage = memory_tracker.get();
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res.thread_id = thread_id;
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res.merge_type = toString(merge_type);
res.merge_algorithm = toString(merge_algorithm.load(std::memory_order_relaxed));
for (const auto & source_part_name : source_part_names)
res.source_part_names.emplace_back(source_part_name);
for (const auto & source_part_path : source_part_paths)
res.source_part_paths.emplace_back(source_part_path);
return res;
}
MergeListElement::~MergeListElement()
{
/// Unplug memory_tracker from current background processing pool thread
if (background_thread_memory_tracker)
background_thread_memory_tracker->setParent(background_thread_memory_tracker_prev_parent);
}
}