mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 02:41:59 +00:00
430 lines
11 KiB
C++
430 lines
11 KiB
C++
#include <DataStreams/IBlockInputStream.h>
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#include <Core/Field.h>
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#include <Interpreters/ProcessList.h>
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#include <Access/EnabledQuota.h>
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#include <Common/CurrentThread.h>
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#include <common/sleep.h>
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namespace ProfileEvents
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{
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extern const Event ThrottlerSleepMicroseconds;
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}
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int QUERY_WAS_CANCELLED;
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extern const int OUTPUT_IS_NOT_SORTED;
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extern const int TOO_MANY_ROWS;
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extern const int TOO_MANY_BYTES;
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extern const int TOO_MANY_ROWS_OR_BYTES;
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extern const int LOGICAL_ERROR;
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extern const int TOO_DEEP_PIPELINE;
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}
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const SortDescription & IBlockInputStream::getSortDescription() const
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{
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throw Exception("Output of " + getName() + " is not sorted", ErrorCodes::OUTPUT_IS_NOT_SORTED);
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}
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/// It's safe to access children without mutex as long as these methods are called before first call to `read()` or `readPrefix()`.
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Block IBlockInputStream::read()
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{
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if (total_rows_approx)
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{
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progressImpl(Progress(0, 0, total_rows_approx));
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total_rows_approx = 0;
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}
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if (!info.started)
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{
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info.total_stopwatch.start();
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info.started = true;
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}
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Block res;
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if (isCancelledOrThrowIfKilled())
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return res;
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if (!checkTimeLimit())
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limit_exceeded_need_break = true;
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if (!limit_exceeded_need_break)
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res = readImpl();
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if (res)
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{
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info.update(res);
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if (enabled_extremes)
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updateExtremes(res);
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if (limits.mode == LIMITS_CURRENT && !limits.size_limits.check(info.rows, info.bytes, "result", ErrorCodes::TOO_MANY_ROWS_OR_BYTES))
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limit_exceeded_need_break = true;
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if (quota)
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checkQuota(res);
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}
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else
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{
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/** If the stream is over, then we will ask all children to abort the execution.
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* This makes sense when running a query with LIMIT
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* - there is a situation when all the necessary data has already been read,
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* but children sources are still working,
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* herewith they can work in separate threads or even remotely.
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*/
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cancel(false);
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}
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progress(Progress(res.rows(), res.bytes()));
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#ifndef NDEBUG
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if (res)
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{
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Block header = getHeader();
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if (header)
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assertBlocksHaveEqualStructure(res, header, getName());
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}
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#endif
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return res;
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}
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void IBlockInputStream::readPrefix()
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{
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#ifndef NDEBUG
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if (!read_prefix_is_called)
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read_prefix_is_called = true;
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else
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throw Exception("readPrefix is called twice for " + getName() + " stream", ErrorCodes::LOGICAL_ERROR);
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#endif
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readPrefixImpl();
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forEachChild([&] (IBlockInputStream & child)
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{
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child.readPrefix();
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return false;
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});
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}
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void IBlockInputStream::readSuffix()
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{
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#ifndef NDEBUG
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if (!read_suffix_is_called)
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read_suffix_is_called = true;
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else
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throw Exception("readSuffix is called twice for " + getName() + " stream", ErrorCodes::LOGICAL_ERROR);
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#endif
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forEachChild([&] (IBlockInputStream & child)
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{
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child.readSuffix();
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return false;
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});
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readSuffixImpl();
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}
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void IBlockInputStream::updateExtremes(Block & block)
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{
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size_t num_columns = block.columns();
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if (!extremes)
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{
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MutableColumns extremes_columns(num_columns);
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for (size_t i = 0; i < num_columns; ++i)
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{
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const ColumnPtr & src = block.safeGetByPosition(i).column;
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if (isColumnConst(*src))
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{
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/// Equal min and max.
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extremes_columns[i] = src->cloneResized(2);
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}
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else
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{
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Field min_value;
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Field max_value;
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src->getExtremes(min_value, max_value);
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extremes_columns[i] = src->cloneEmpty();
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extremes_columns[i]->insert(min_value);
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extremes_columns[i]->insert(max_value);
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}
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}
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extremes = block.cloneWithColumns(std::move(extremes_columns));
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}
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else
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{
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for (size_t i = 0; i < num_columns; ++i)
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{
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ColumnPtr & old_extremes = extremes.safeGetByPosition(i).column;
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if (isColumnConst(*old_extremes))
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continue;
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Field min_value = (*old_extremes)[0];
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Field max_value = (*old_extremes)[1];
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Field cur_min_value;
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Field cur_max_value;
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block.safeGetByPosition(i).column->getExtremes(cur_min_value, cur_max_value);
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if (cur_min_value < min_value)
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min_value = cur_min_value;
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if (cur_max_value > max_value)
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max_value = cur_max_value;
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MutableColumnPtr new_extremes = old_extremes->cloneEmpty();
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new_extremes->insert(min_value);
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new_extremes->insert(max_value);
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old_extremes = std::move(new_extremes);
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}
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}
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}
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bool IBlockInputStream::checkTimeLimit()
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{
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return limits.speed_limits.checkTimeLimit(info.total_stopwatch.elapsed(), limits.timeout_overflow_mode);
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}
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void IBlockInputStream::checkQuota(Block & block)
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{
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switch (limits.mode)
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{
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case LIMITS_TOTAL:
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/// Checked in `progress` method.
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break;
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case LIMITS_CURRENT:
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{
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UInt64 total_elapsed = info.total_stopwatch.elapsedNanoseconds();
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quota->used({Quota::RESULT_ROWS, block.rows()}, {Quota::RESULT_BYTES, block.bytes()}, {Quota::EXECUTION_TIME, total_elapsed - prev_elapsed});
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prev_elapsed = total_elapsed;
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break;
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}
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}
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}
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void IBlockInputStream::progressImpl(const Progress & value)
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{
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if (progress_callback)
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progress_callback(value);
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if (process_list_elem)
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{
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if (!process_list_elem->updateProgressIn(value))
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cancel(/* kill */ true);
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/// The total amount of data processed or intended for processing in all leaf sources, possibly on remote servers.
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ProgressValues progress = process_list_elem->getProgressIn();
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size_t total_rows_estimate = std::max(progress.read_rows, progress.total_rows_to_read);
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/** Check the restrictions on the amount of data to read, the speed of the query, the quota on the amount of data to read.
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* NOTE: Maybe it makes sense to have them checked directly in ProcessList?
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*/
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if (limits.mode == LIMITS_TOTAL)
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{
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if (!limits.size_limits.check(total_rows_estimate, progress.read_bytes, "rows to read",
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ErrorCodes::TOO_MANY_ROWS, ErrorCodes::TOO_MANY_BYTES))
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cancel(false);
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}
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size_t total_rows = progress.total_rows_to_read;
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constexpr UInt64 profile_events_update_period_microseconds = 10 * 1000; // 10 milliseconds
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UInt64 total_elapsed_microseconds = info.total_stopwatch.elapsedMicroseconds();
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if (last_profile_events_update_time + profile_events_update_period_microseconds < total_elapsed_microseconds)
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{
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CurrentThread::updatePerformanceCounters();
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last_profile_events_update_time = total_elapsed_microseconds;
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}
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limits.speed_limits.throttle(progress.read_rows, progress.read_bytes, total_rows, total_elapsed_microseconds);
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if (quota && limits.mode == LIMITS_TOTAL)
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quota->used({Quota::READ_ROWS, value.read_rows}, {Quota::READ_BYTES, value.read_bytes});
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}
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}
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void IBlockInputStream::cancel(bool kill)
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{
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if (kill)
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is_killed = true;
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bool old_val = false;
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if (!is_cancelled.compare_exchange_strong(old_val, true, std::memory_order_seq_cst, std::memory_order_relaxed))
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return;
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forEachChild([&] (IBlockInputStream & child)
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{
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child.cancel(kill);
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return false;
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});
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}
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bool IBlockInputStream::isCancelled() const
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{
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return is_cancelled;
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}
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bool IBlockInputStream::isCancelledOrThrowIfKilled() const
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{
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if (!is_cancelled)
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return false;
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if (is_killed)
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throw Exception("Query was cancelled", ErrorCodes::QUERY_WAS_CANCELLED);
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return true;
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}
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void IBlockInputStream::setProgressCallback(const ProgressCallback & callback)
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{
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progress_callback = callback;
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forEachChild([&] (IBlockInputStream & child)
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{
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child.setProgressCallback(callback);
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return false;
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});
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}
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void IBlockInputStream::setProcessListElement(QueryStatus * elem)
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{
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process_list_elem = elem;
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forEachChild([&] (IBlockInputStream & child)
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{
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child.setProcessListElement(elem);
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return false;
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});
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}
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Block IBlockInputStream::getTotals()
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{
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if (totals)
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return totals;
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Block res;
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forEachChild([&] (IBlockInputStream & child)
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{
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res = child.getTotals();
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return bool(res);
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});
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return res;
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}
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Block IBlockInputStream::getExtremes()
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{
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if (extremes)
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return extremes;
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Block res;
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forEachChild([&] (IBlockInputStream & child)
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{
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res = child.getExtremes();
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return bool(res);
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});
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return res;
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}
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String IBlockInputStream::getTreeID() const
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{
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std::stringstream s;
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s << getName();
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if (!children.empty())
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{
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s << "(";
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for (BlockInputStreams::const_iterator it = children.begin(); it != children.end(); ++it)
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{
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if (it != children.begin())
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s << ", ";
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s << (*it)->getTreeID();
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}
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s << ")";
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}
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return s.str();
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}
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size_t IBlockInputStream::checkDepthImpl(size_t max_depth, size_t level) const
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{
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if (children.empty())
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return 0;
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if (level > max_depth)
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throw Exception("Query pipeline is too deep. Maximum: " + toString(max_depth), ErrorCodes::TOO_DEEP_PIPELINE);
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size_t res = 0;
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for (const auto & child : children)
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{
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size_t child_depth = child->checkDepth(level + 1);
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if (child_depth > res)
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res = child_depth;
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}
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return res + 1;
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}
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void IBlockInputStream::dumpTree(std::ostream & ostr, size_t indent, size_t multiplier) const
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{
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ostr << String(indent, ' ') << getName();
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if (multiplier > 1)
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ostr << " × " << multiplier;
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//ostr << ": " << getHeader().dumpStructure();
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ostr << std::endl;
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++indent;
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/// If the subtree is repeated several times, then we output it once with the multiplier.
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using Multipliers = std::map<String, size_t>;
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Multipliers multipliers;
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for (const auto & child : children)
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++multipliers[child->getTreeID()];
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for (const auto & child : children)
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{
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String id = child->getTreeID();
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size_t & subtree_multiplier = multipliers[id];
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if (subtree_multiplier != 0) /// Already printed subtrees are marked with zero in the array of multipliers.
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{
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child->dumpTree(ostr, indent, subtree_multiplier);
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subtree_multiplier = 0;
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}
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}
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}
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}
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