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dbms: round subtask size up to multiple of max_block_size [#METR-16457]

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This commit is contained in:
Andrey Mironov 2015-09-02 19:09:32 +03:00
parent 288f46936a
commit 6b642e8749
1 changed files with 7 additions and 5 deletions
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12
dbms/include/DB/Storages/MergeTree/MergeTreeThreadBlockInputStream.h
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@ -20,8 +20,9 @@ public:
const MergeTreeReadPoolPtr & pool, const std::size_t min_marks_to_read, const std::size_t block_size,
MergeTreeData & storage, const bool use_uncompressed_cache, const ExpressionActionsPtr & prewhere_actions,
const String & prewhere_column, const Settings & settings, const Names & virt_column_names)
: thread{thread}, pool{pool}, min_marks_to_read{min_marks_to_read}, block_size{block_size}, storage{storage},
use_uncompressed_cache{use_uncompressed_cache}, prewhere_actions{prewhere_actions},
: thread{thread}, pool{pool}, block_size_marks{block_size / storage.index_granularity},
min_marks_to_read{(min_marks_to_read + block_size_marks - 1) / block_size_marks * block_size_marks},
storage{storage}, use_uncompressed_cache{use_uncompressed_cache}, prewhere_actions{prewhere_actions},
prewhere_column{prewhere_column}, min_bytes_to_use_direct_io{settings.min_bytes_to_use_direct_io},
max_read_buffer_size{settings.max_read_buffer_size},
reuse_buffers(settings.merge_tree_uniform_read_reuse_buffers), virt_column_names{virt_column_names},
@ -33,6 +34,7 @@ public:
String getID() const override
{
std::stringstream res;
/// @todo print some meaningful information
// res << "MergeTreeThread(columns";
//
// for (const auto & column : columns)
@ -128,7 +130,7 @@ private:
do
{
/// Прочитаем полный блок столбцов, нужных для вычисления выражения в PREWHERE.
size_t space_left = std::max(1LU, block_size / storage.index_granularity);
size_t space_left = std::max(1LU, block_size_marks);
MarkRanges ranges_to_read;
while (!task->mark_ranges.empty() && space_left)
{
@ -257,7 +259,7 @@ private:
}
else
{
size_t space_left = std::max(1LU, block_size / storage.index_granularity);
size_t space_left = std::max(1LU, block_size_marks);
while (!task->mark_ranges.empty() && space_left)
{
@ -310,8 +312,8 @@ private:
}
MergeTreeReadPoolPtr pool;
const std::size_t block_size_marks;
const std::size_t min_marks_to_read;
const std::size_t block_size;
MergeTreeData & storage;
const bool use_uncompressed_cache;
ExpressionActionsPtr prewhere_actions;