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Use independent io thread pool

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This commit is contained in:
liuneng 2024-09-26 16:35:05 +08:00
parent 341f93d1b8
commit 9ee1652e23
6 changed files with 40 additions and 14 deletions
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3
src/Common/CurrentMetrics.cpp
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@ -216,6 +216,9 @@
M(ParquetDecoderThreads, "Number of threads in the ParquetBlockInputFormat thread pool.") \
M(ParquetDecoderThreadsActive, "Number of threads in the ParquetBlockInputFormat thread pool running a task.") \
M(ParquetDecoderThreadsScheduled, "Number of queued or active jobs in the ParquetBlockInputFormat thread pool.") \
M(ParquetDecoderIOThreads, "Number of threads in the ParquetBlockInputFormat io thread pool.") \
M(ParquetDecoderIOThreadsActive, "Number of threads in the ParquetBlockInputFormat io thread pool running a task.") \
M(ParquetDecoderIOThreadsScheduled, "Number of queued or active jobs in the ParquetBlockInputFormat io thread pool.") \
M(ParquetEncoderThreads, "Number of threads in ParquetBlockOutputFormat thread pool.") \
M(ParquetEncoderThreadsActive, "Number of threads in ParquetBlockOutputFormat thread pool running a task.") \
M(ParquetEncoderThreadsScheduled, "Number of queued or active jobs in ParquetBlockOutputFormat thread pool.") \

2
src/Core/SettingsChangesHistory.cpp
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@ -72,6 +72,7 @@ static std::initializer_list<std::pair<ClickHouseVersion, SettingsChangesHistory
{"parallel_replicas_mode", "read_tasks", "read_tasks", "This setting was introduced as a part of making parallel replicas feature Beta"},
{"show_create_query_identifier_quoting_rule", "when_necessary", "when_necessary", "New setting."},
{"show_create_query_identifier_quoting_style", "Backticks", "Backticks", "New setting."},
{"input_format_parquet_enable_row_group_prefetch", false, true, "Enable row group prefetching during parquet parsing. Currently, only single-threaded parsing can prefetch."},
}
},
{"24.9",
@ -90,7 +91,6 @@ static std::initializer_list<std::pair<ClickHouseVersion, SettingsChangesHistory
{"join_to_sort_maximum_table_rows", 0, 10000, "The maximum number of rows in the right table to determine whether to rerange the right table by key in left or inner join"},
{"allow_experimental_join_right_table_sorting", false, false, "If it is set to true, and the conditions of `join_to_sort_minimum_perkey_rows` and `join_to_sort_maximum_table_rows` are met, rerange the right table by key to improve the performance in left or inner hash join"},
{"mongodb_throw_on_unsupported_query", false, true, "New setting."},
{"input_format_parquet_enable_row_group_prefetch", false, true, "Enable row group prefetching during parquet parsing. Currently, only single-threaded parsing can prefetch."},
}
},
{"24.8",

21
src/Processors/Formats/Impl/ArrowBufferedStreams.cpp
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@ -186,9 +186,10 @@ arrow::Status ArrowInputStreamFromReadBuffer::Close()
return arrow::Status();
}
RandomAccessFileFromRandomAccessReadBuffer::RandomAccessFileFromRandomAccessReadBuffer(SeekableReadBuffer & in_, size_t file_size_) : in(in_), file_size(file_size_)
RandomAccessFileFromRandomAccessReadBuffer::RandomAccessFileFromRandomAccessReadBuffer(SeekableReadBuffer & in_, size_t file_size_, std::shared_ptr<ThreadPool> io_pool_) : in(in_), file_size(file_size_), io_pool(io_pool_)
{
async_runner = threadPoolCallbackRunnerUnsafe<void>(getIOThreadPool().get(), "ArrowFile");
if (io_pool)
async_runner = threadPoolCallbackRunnerUnsafe<void>(*io_pool, "ArrowFile");
}
arrow::Result<int64_t> RandomAccessFileFromRandomAccessReadBuffer::GetSize()
@ -225,7 +226,12 @@ arrow::Result<std::shared_ptr<arrow::Buffer>> RandomAccessFileFromRandomAccessRe
arrow::Future<std::shared_ptr<arrow::Buffer>> RandomAccessFileFromRandomAccessReadBuffer::ReadAsync(const arrow::io::IOContext&, int64_t position, int64_t nbytes)
{
auto future = arrow::Future<std::shared_ptr<arrow::Buffer>>::Make();
async_runner([this, weak_future = arrow::WeakFuture(future), position, nbytes]() mutable { asyncThreadFunction(weak_future, position, nbytes); }, {0});
if (io_pool)
{
async_runner([this, future, position, nbytes]() mutable { asyncThreadFunction(future, position, nbytes); }, {});
return future.Then([=]() {return future.result();});
}
asyncThreadFunction(future, position, nbytes);
return future;
}
@ -237,10 +243,10 @@ arrow::Status RandomAccessFileFromRandomAccessReadBuffer::Close()
return arrow::Status::OK();
}
void RandomAccessFileFromRandomAccessReadBuffer::asyncThreadFunction(
arrow::WeakFuture<std::shared_ptr<arrow::Buffer>> & future, int64_t position, int64_t nbytes)
arrow::Future<std::shared_ptr<arrow::Buffer>> future, int64_t position, int64_t nbytes)
{
auto buffer = ReadAt(position, nbytes);
future.get().MarkFinished(buffer);
future.MarkFinished(buffer);
}
arrow::Status RandomAccessFileFromRandomAccessReadBuffer::Seek(int64_t) { return arrow::Status::NotImplemented(""); }
@ -320,7 +326,8 @@ std::shared_ptr<arrow::io::RandomAccessFile> asArrowFile(
std::atomic<int> & is_cancelled,
const std::string & format_name,
const std::string & magic_bytes,
bool avoid_buffering)
bool avoid_buffering,
std::shared_ptr<ThreadPool> io_pool)
{
bool has_file_size = isBufferWithFileSize(in);
auto * seekable_in = dynamic_cast<SeekableReadBuffer *>(&in);
@ -328,7 +335,7 @@ std::shared_ptr<arrow::io::RandomAccessFile> asArrowFile(
if (has_file_size && seekable_in && settings.seekable_read)
{
if (avoid_buffering && seekable_in->supportsReadAt())
return std::make_shared<RandomAccessFileFromRandomAccessReadBuffer>(*seekable_in, getFileSizeFromReadBuffer(in));
return std::make_shared<RandomAccessFileFromRandomAccessReadBuffer>(*seekable_in, getFileSizeFromReadBuffer(in), io_pool);
if (seekable_in->checkIfActuallySeekable())
return std::make_shared<RandomAccessFileFromSeekableReadBuffer>(*seekable_in, std::nullopt, avoid_buffering);

8
src/Processors/Formats/Impl/ArrowBufferedStreams.h
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@ -83,7 +83,7 @@ private:
class RandomAccessFileFromRandomAccessReadBuffer : public arrow::io::RandomAccessFile
{
public:
explicit RandomAccessFileFromRandomAccessReadBuffer(SeekableReadBuffer & in_, size_t file_size_);
explicit RandomAccessFileFromRandomAccessReadBuffer(SeekableReadBuffer & in_, size_t file_size_, std::shared_ptr<ThreadPool> io_pool = nullptr);
// These are thread safe.
arrow::Result<int64_t> GetSize() override;
@ -102,12 +102,13 @@ public:
bool closed() const override { return !is_open; }
private:
void asyncThreadFunction(arrow::WeakFuture<std::shared_ptr<arrow::Buffer>>& future, int64_t position, int64_t nbytes);
void asyncThreadFunction(arrow::Future<std::shared_ptr<arrow::Buffer>> future, int64_t position, int64_t nbytes);
SeekableReadBuffer & in;
ThreadPoolCallbackRunnerUnsafe<void> async_runner;
size_t file_size;
bool is_open = true;
std::shared_ptr<ThreadPool> io_pool;
ARROW_DISALLOW_COPY_AND_ASSIGN(RandomAccessFileFromRandomAccessReadBuffer);
};
@ -162,7 +163,8 @@ std::shared_ptr<arrow::io::RandomAccessFile> asArrowFile(
// read call will do a new HTTP request. Used in parquet pre-buffered reading mode, which makes
// arrow do its own buffering and coalescing of reads.
// (ReadBuffer is not a good abstraction in this case, but it works.)
bool avoid_buffering = false);
bool avoid_buffering = false,
std::shared_ptr<ThreadPool> io_pool = nullptr);
// Reads the whole file into a memory buffer, owned by the returned RandomAccessFile.
std::shared_ptr<arrow::io::RandomAccessFile> asArrowFileLoadIntoMemory(

17
src/Processors/Formats/Impl/ParquetBlockInputFormat.cpp
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@ -32,6 +32,10 @@ namespace CurrentMetrics
extern const Metric ParquetDecoderThreads;
extern const Metric ParquetDecoderThreadsActive;
extern const Metric ParquetDecoderThreadsScheduled;
extern const Metric ParquetDecoderIOThreads;
extern const Metric ParquetDecoderIOThreadsActive;
extern const Metric ParquetDecoderIOThreadsScheduled;
}
namespace DB
@ -434,16 +438,20 @@ ParquetBlockInputFormat::ParquetBlockInputFormat(
const Block & header_,
const FormatSettings & format_settings_,
size_t max_decoding_threads_,
size_t max_io_threads_,
size_t min_bytes_for_seek_)
: IInputFormat(header_, &buf)
, format_settings(format_settings_)
, skip_row_groups(format_settings.parquet.skip_row_groups)
, max_decoding_threads(max_decoding_threads_)
, max_io_threads(max_io_threads_)
, min_bytes_for_seek(min_bytes_for_seek_)
, pending_chunks(PendingChunk::Compare { .row_group_first = format_settings_.parquet.preserve_order })
{
if (max_decoding_threads > 1)
pool = std::make_unique<ThreadPool>(CurrentMetrics::ParquetDecoderThreads, CurrentMetrics::ParquetDecoderThreadsActive, CurrentMetrics::ParquetDecoderThreadsScheduled, max_decoding_threads);
if (supportPrefetch())
io_pool = std::make_shared<ThreadPool>(CurrentMetrics::ParquetDecoderIOThreads, CurrentMetrics::ParquetDecoderIOThreadsActive, CurrentMetrics::ParquetDecoderIOThreadsScheduled, max_io_threads);
}
ParquetBlockInputFormat::~ParquetBlockInputFormat()
@ -451,6 +459,8 @@ ParquetBlockInputFormat::~ParquetBlockInputFormat()
is_stopped = true;
if (pool)
pool->wait();
if (io_pool)
io_pool->wait();
}
void ParquetBlockInputFormat::initializeIfNeeded()
@ -461,7 +471,7 @@ void ParquetBlockInputFormat::initializeIfNeeded()
// Create arrow file adapter.
// TODO: Make the adapter do prefetching on IO threads, based on the full set of ranges that
// we'll need to read (which we know in advance). Use max_download_threads for that.
arrow_file = asArrowFile(*in, format_settings, is_stopped, "Parquet", PARQUET_MAGIC_BYTES, /* avoid_buffering */ true);
arrow_file = asArrowFile(*in, format_settings, is_stopped, "Parquet", PARQUET_MAGIC_BYTES, /* avoid_buffering */ true, io_pool);
if (is_stopped)
return;
@ -680,7 +690,7 @@ void ParquetBlockInputFormat::threadFunction(size_t row_group_batch_idx)
}
bool ParquetBlockInputFormat::supportPrefetch() const
{
return max_decoding_threads == 1 && format_settings.parquet.enable_row_group_prefetch && !format_settings.parquet.use_native_reader;
return max_decoding_threads == 1 && max_io_threads > 0 && format_settings.parquet.enable_row_group_prefetch && !format_settings.parquet.use_native_reader;
}
std::shared_ptr<arrow::RecordBatchReader> ParquetBlockInputFormat::RowGroupPrefetchIterator::nextRowGroupReader()
@ -953,7 +963,7 @@ void registerInputFormatParquet(FormatFactory & factory)
const FormatSettings & settings,
const ReadSettings & read_settings,
bool is_remote_fs,
size_t /* max_download_threads */,
size_t max_download_threads,
size_t max_parsing_threads)
{
size_t min_bytes_for_seek = is_remote_fs ? read_settings.remote_read_min_bytes_for_seek : settings.parquet.local_read_min_bytes_for_seek;
@ -962,6 +972,7 @@ void registerInputFormatParquet(FormatFactory & factory)
sample,
settings,
max_parsing_threads,
max_download_threads,
min_bytes_for_seek);
});
factory.markFormatSupportsSubsetOfColumns("Parquet");

3
src/Processors/Formats/Impl/ParquetBlockInputFormat.h
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@ -59,6 +59,7 @@ public:
const Block & header,
const FormatSettings & format_settings,
size_t max_decoding_threads,
size_t max_io_threads,
size_t min_bytes_for_seek);
~ParquetBlockInputFormat() override;
@ -293,6 +294,7 @@ private:
const FormatSettings format_settings;
const std::unordered_set<int> & skip_row_groups;
size_t max_decoding_threads;
size_t max_io_threads;
size_t min_bytes_for_seek;
const size_t max_pending_chunks_per_row_group_batch = 2;
@ -324,6 +326,7 @@ private:
// These are only used when max_decoding_threads > 1.
size_t row_group_batches_started = 0;
std::unique_ptr<ThreadPool> pool;
std::shared_ptr<ThreadPool> io_pool;
BlockMissingValues previous_block_missing_values;
size_t previous_approx_bytes_read_for_chunk = 0;