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304 lines
9.8 KiB
C++
304 lines
9.8 KiB
C++
#include <Columns/ColumnSparse.h>
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#include <Columns/FilterDescription.h>
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#include <Columns/IColumn.h>
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#include <Core/ColumnsWithTypeAndName.h>
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#include <Core/NamesAndTypes.h>
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#include <DataTypes/DataTypeLowCardinality.h>
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#include <Interpreters/ConcurrentHashJoin.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/ExpressionActions.h>
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#include <Interpreters/PreparedSets.h>
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#include <Interpreters/TableJoin.h>
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#include <Interpreters/createBlockSelector.h>
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#include <Parsers/DumpASTNode.h>
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#include <Parsers/ExpressionListParsers.h>
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#include <Parsers/IAST_fwd.h>
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#include <Parsers/parseQuery.h>
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#include <Common/CurrentThread.h>
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#include <Common/Exception.h>
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#include <Common/ThreadPool.h>
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#include <Common/WeakHash.h>
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#include <Common/scope_guard_safe.h>
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#include <Common/setThreadName.h>
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#include <Common/typeid_cast.h>
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namespace CurrentMetrics
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{
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extern const Metric ConcurrentHashJoinPoolThreads;
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extern const Metric ConcurrentHashJoinPoolThreadsActive;
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extern const Metric ConcurrentHashJoinPoolThreadsScheduled;
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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 LOGICAL_ERROR;
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extern const int SET_SIZE_LIMIT_EXCEEDED;
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}
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static UInt32 toPowerOfTwo(UInt32 x)
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{
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if (x <= 1)
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return 1;
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return static_cast<UInt32>(1) << (32 - std::countl_zero(x - 1));
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}
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ConcurrentHashJoin::ConcurrentHashJoin(
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ContextPtr context_, std::shared_ptr<TableJoin> table_join_, size_t slots_, const Block & right_sample_block, bool any_take_last_row_)
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: context(context_)
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, table_join(table_join_)
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, slots(toPowerOfTwo(std::min<UInt32>(static_cast<UInt32>(slots_), 256)))
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, pool(std::make_unique<ThreadPool>(
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CurrentMetrics::ConcurrentHashJoinPoolThreads,
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CurrentMetrics::ConcurrentHashJoinPoolThreadsActive,
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CurrentMetrics::ConcurrentHashJoinPoolThreadsScheduled,
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slots))
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{
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hash_joins.resize(slots);
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try
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{
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for (size_t i = 0; i < slots; ++i)
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{
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pool->scheduleOrThrow(
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[&, idx = i, thread_group = CurrentThread::getGroup()]()
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{
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SCOPE_EXIT_SAFE({
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if (thread_group)
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CurrentThread::detachFromGroupIfNotDetached();
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});
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if (thread_group)
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CurrentThread::attachToGroupIfDetached(thread_group);
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setThreadName("ConcurrentJoin");
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auto inner_hash_join = std::make_shared<InternalHashJoin>();
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inner_hash_join->data = std::make_unique<HashJoin>(
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table_join_, right_sample_block, any_take_last_row_, 0, fmt::format("concurrent{}", idx));
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/// Non zero `max_joined_block_rows` allows to process block partially and return not processed part.
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/// TODO: It's not handled properly in ConcurrentHashJoin case, so we set it to 0 to disable this feature.
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inner_hash_join->data->setMaxJoinedBlockRows(0);
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hash_joins[idx] = std::move(inner_hash_join);
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});
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}
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pool->wait();
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}
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catch (...)
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{
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tryLogCurrentException(__PRETTY_FUNCTION__);
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pool->wait();
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throw;
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}
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}
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ConcurrentHashJoin::~ConcurrentHashJoin()
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{
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try
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{
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for (size_t i = 0; i < slots; ++i)
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{
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// Hash tables destruction may be very time-consuming.
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// Without the following code, they would be destroyed in the current thread (i.e. sequentially).
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// `InternalHashJoin` is moved here and will be destroyed in the destructor of the lambda function.
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pool->scheduleOrThrow(
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[join = std::move(hash_joins[i]), thread_group = CurrentThread::getGroup()]()
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{
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SCOPE_EXIT_SAFE({
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if (thread_group)
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CurrentThread::detachFromGroupIfNotDetached();
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});
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if (thread_group)
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CurrentThread::attachToGroupIfDetached(thread_group);
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setThreadName("ConcurrentJoin");
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});
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}
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pool->wait();
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}
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catch (...)
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{
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tryLogCurrentException(__PRETTY_FUNCTION__);
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pool->wait();
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}
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}
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bool ConcurrentHashJoin::addBlockToJoin(const Block & right_block, bool check_limits)
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{
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Blocks dispatched_blocks = dispatchBlock(table_join->getOnlyClause().key_names_right, right_block);
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size_t blocks_left = 0;
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for (const auto & block : dispatched_blocks)
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{
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if (block)
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{
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++blocks_left;
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}
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}
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while (blocks_left > 0)
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{
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/// insert blocks into corresponding HashJoin instances
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for (size_t i = 0; i < dispatched_blocks.size(); ++i)
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{
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auto & hash_join = hash_joins[i];
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auto & dispatched_block = dispatched_blocks[i];
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if (dispatched_block)
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{
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/// if current hash_join is already processed by another thread, skip it and try later
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std::unique_lock<std::mutex> lock(hash_join->mutex, std::try_to_lock);
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if (!lock.owns_lock())
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continue;
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bool limit_exceeded = !hash_join->data->addBlockToJoin(dispatched_block, check_limits);
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dispatched_block = {};
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blocks_left--;
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if (limit_exceeded)
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return false;
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}
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}
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}
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if (check_limits)
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return table_join->sizeLimits().check(getTotalRowCount(), getTotalByteCount(), "JOIN", ErrorCodes::SET_SIZE_LIMIT_EXCEEDED);
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return true;
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}
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void ConcurrentHashJoin::joinBlock(Block & block, std::shared_ptr<ExtraBlock> & /*not_processed*/)
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{
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Blocks dispatched_blocks = dispatchBlock(table_join->getOnlyClause().key_names_left, block);
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block = {};
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for (size_t i = 0; i < dispatched_blocks.size(); ++i)
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{
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std::shared_ptr<ExtraBlock> none_extra_block;
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auto & hash_join = hash_joins[i];
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auto & dispatched_block = dispatched_blocks[i];
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hash_join->data->joinBlock(dispatched_block, none_extra_block);
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if (none_extra_block && !none_extra_block->empty())
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throw Exception(ErrorCodes::LOGICAL_ERROR, "not_processed should be empty");
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}
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block = concatenateBlocks(dispatched_blocks);
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}
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void ConcurrentHashJoin::checkTypesOfKeys(const Block & block) const
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{
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hash_joins[0]->data->checkTypesOfKeys(block);
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}
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void ConcurrentHashJoin::setTotals(const Block & block)
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{
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if (block)
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{
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std::lock_guard lock(totals_mutex);
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totals = block;
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}
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}
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const Block & ConcurrentHashJoin::getTotals() const
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{
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return totals;
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}
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size_t ConcurrentHashJoin::getTotalRowCount() const
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{
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size_t res = 0;
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for (const auto & hash_join : hash_joins)
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{
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std::lock_guard lock(hash_join->mutex);
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res += hash_join->data->getTotalRowCount();
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}
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return res;
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}
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size_t ConcurrentHashJoin::getTotalByteCount() const
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{
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size_t res = 0;
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for (const auto & hash_join : hash_joins)
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{
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std::lock_guard lock(hash_join->mutex);
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res += hash_join->data->getTotalByteCount();
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}
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return res;
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}
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bool ConcurrentHashJoin::alwaysReturnsEmptySet() const
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{
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for (const auto & hash_join : hash_joins)
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{
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std::lock_guard lock(hash_join->mutex);
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if (!hash_join->data->alwaysReturnsEmptySet())
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return false;
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}
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return true;
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}
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IBlocksStreamPtr ConcurrentHashJoin::getNonJoinedBlocks(
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const Block & /*left_sample_block*/, const Block & /*result_sample_block*/, UInt64 /*max_block_size*/) const
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{
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if (!JoinCommon::hasNonJoinedBlocks(*table_join))
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return {};
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Invalid join type. join kind: {}, strictness: {}",
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table_join->kind(), table_join->strictness());
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}
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static ALWAYS_INLINE IColumn::Selector hashToSelector(const WeakHash32 & hash, size_t num_shards)
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{
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assert(num_shards > 0 && (num_shards & (num_shards - 1)) == 0);
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const auto & data = hash.getData();
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size_t num_rows = data.size();
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IColumn::Selector selector(num_rows);
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for (size_t i = 0; i < num_rows; ++i)
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/// Apply intHash64 to mix bits in data.
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/// HashTable internally uses WeakHash32, and we need to get different lower bits not to cause collisions.
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selector[i] = intHash64(data[i]) & (num_shards - 1);
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return selector;
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}
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IColumn::Selector ConcurrentHashJoin::selectDispatchBlock(const Strings & key_columns_names, const Block & from_block)
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{
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size_t num_rows = from_block.rows();
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size_t num_shards = hash_joins.size();
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WeakHash32 hash(num_rows);
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for (const auto & key_name : key_columns_names)
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{
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const auto & key_col = from_block.getByName(key_name).column->convertToFullColumnIfConst();
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const auto & key_col_no_lc = recursiveRemoveLowCardinality(recursiveRemoveSparse(key_col));
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key_col_no_lc->updateWeakHash32(hash);
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}
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return hashToSelector(hash, num_shards);
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}
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Blocks ConcurrentHashJoin::dispatchBlock(const Strings & key_columns_names, const Block & from_block)
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{
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/// TODO: use JoinCommon::scatterBlockByHash
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size_t num_shards = hash_joins.size();
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size_t num_cols = from_block.columns();
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IColumn::Selector selector = selectDispatchBlock(key_columns_names, from_block);
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Blocks result(num_shards);
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for (size_t i = 0; i < num_shards; ++i)
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result[i] = from_block.cloneEmpty();
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for (size_t i = 0; i < num_cols; ++i)
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{
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auto dispatched_columns = from_block.getByPosition(i).column->scatter(num_shards, selector);
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assert(result.size() == dispatched_columns.size());
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for (size_t block_index = 0; block_index < num_shards; ++block_index)
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{
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result[block_index].getByPosition(i).column = std::move(dispatched_columns[block_index]);
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}
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}
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return result;
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}
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}
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