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#include <Formats/FormatFactory.h>
#include <Interpreters/Context.h>
#include <Processors/Executors/StreamingFormatExecutor.h>
#include <Storages/FileLog/FileLogSource.h>
#include <Storages/FileLog/ReadBufferFromFileLog.h>
#include <Common/Stopwatch.h>
#include <Common/logger_useful.h>
namespace DB
{
static constexpr auto MAX_FAILED_POLL_ATTEMPTS = 10;
FileLogSource::FileLogSource(
StorageFileLog & storage_,
const StorageSnapshotPtr & storage_snapshot_,
const ContextPtr & context_,
const Names & columns,
size_t max_block_size_,
size_t poll_time_out_,
size_t stream_number_,
size_t max_streams_number_)
: ISource(storage_snapshot_->getSampleBlockForColumns(columns))
, storage(storage_)
, storage_snapshot(storage_snapshot_)
, context(context_)
, column_names(columns)
, max_block_size(max_block_size_)
, poll_time_out(poll_time_out_)
, stream_number(stream_number_)
, max_streams_number(max_streams_number_)
, non_virtual_header(storage_snapshot->metadata->getSampleBlockNonMaterialized())
, virtual_header(storage_snapshot->getSampleBlockForColumns(storage.getVirtualColumnNames()))
{
buffer = std::make_unique<ReadBufferFromFileLog>(storage, max_block_size, poll_time_out, context, stream_number_, max_streams_number_);
const auto & file_infos = storage.getFileInfos();
size_t files_per_stream = file_infos.file_names.size() / max_streams_number;
start = stream_number * files_per_stream;
end = stream_number == max_streams_number - 1 ? file_infos.file_names.size() : (stream_number + 1) * files_per_stream;
storage.increaseStreams();
}
FileLogSource::~FileLogSource()
{
try
{
if (!finished)
onFinish();
}
catch (...)
{
tryLogCurrentException(__PRETTY_FUNCTION__);
}
}
void FileLogSource::onFinish()
{
storage.closeFilesAndStoreMeta(start, end);
storage.reduceStreams();
finished = true;
}
Chunk FileLogSource::generate()
{
/// Store metas of last written chunk into disk
storage.storeMetas(start, end);
if (!buffer || buffer->noRecords())
{
/// There is no onFinish for ISource, we call it
/// when no records return to close files
onFinish();
return {};
}
MutableColumns virtual_columns = virtual_header.cloneEmptyColumns();
auto input_format = FormatFactory::instance().getInput(
storage.getFormatName(), *buffer, non_virtual_header, context, max_block_size, std::nullopt, 1);
StreamingFormatExecutor executor(non_virtual_header, input_format);
size_t total_rows = 0;
size_t failed_poll_attempts = 0;
Stopwatch watch;
while (true)
{
size_t new_rows = 0;
if (buffer->poll())
new_rows = executor.execute();
if (new_rows)
{
auto file_name = buffer->getFileName();
auto offset = buffer->getOffset();
for (size_t i = 0; i < new_rows; ++i)
{
virtual_columns[0]->insert(file_name);
virtual_columns[1]->insert(offset);
}
total_rows = total_rows + new_rows;
}
else /// poll succeed, but parse failed
{
++failed_poll_attempts;
}
if (!buffer->hasMorePolledRecords()
&& ((total_rows >= max_block_size) || watch.elapsedMilliseconds() > poll_time_out
|| failed_poll_attempts >= MAX_FAILED_POLL_ATTEMPTS))
{
break;
}
}
if (total_rows == 0)
{
onFinish();
return {};
}
auto result_block = non_virtual_header.cloneWithColumns(executor.getResultColumns());
auto virtual_block = virtual_header.cloneWithColumns(std::move(virtual_columns));
for (const auto & column : virtual_block.getColumnsWithTypeAndName())
result_block.insert(column);
auto converting_dag = ActionsDAG::makeConvertingActions(
result_block.cloneEmpty().getColumnsWithTypeAndName(),
getPort().getHeader().getColumnsWithTypeAndName(),
ActionsDAG::MatchColumnsMode::Name);
auto converting_actions = std::make_shared<ExpressionActions>(std::move(converting_dag));
converting_actions->execute(result_block);
return Chunk(result_block.getColumns(), result_block.rows());
}
}
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