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* Configure keeper for perf tests Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com> * Improve performance of SELECTs with active mutations getAlterMutationCommandsForPart() can be a hot path for query execution when there are pending mutations. - LOG_TEST - it is not only check one bool, but actually a bunch of atomics as well. - Return std::vector over std::map (map is not required there) - no changes in performance. - Copy only RENAME_COLUMN (since only this mutation is required by AlterConversions). And here are results: run|result -|- SELECT w/o ALTER|queries: 1565, QPS: 355.259, RPS: 355.259 SELECT w/ ALTER unpatched|queries: 2099, QPS: 220.623, RPS: 220.623 SELECT w/ ALTER and w/o LOG_TEST|queries: 2730, QPS: 235.859, RPS: 235.859 SELECT w/ ALTER and w/o LOG_TEST and w/ RENAME_COLUMN only|queries: 2995, QPS: 290.982, RPS: 290.982 But there are still room for improvements, at least MergeTree engines could implement getStorageSnapshotForQuery(). Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com> * Add AlterConversions::supportsMutationCommandType(), flatten vector<vector<MutationCommand>> * Work around what appears to be a clang static analysis bug --------- Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com> Co-authored-by: Michael Kolupaev <michael.kolupaev@clickhouse.com>
36 lines
1.4 KiB
XML
36 lines
1.4 KiB
XML
<test>
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<substitutions>
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<substitution>
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<name>engine</name>
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<values>
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<value>mt</value>
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<value>rmt</value>
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</values>
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</substitution>
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</substitutions>
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<create_query>create table alter_select_mt (part_id String, col_0 String) engine=MergeTree() partition by part_id order by tuple() settings max_parts_to_merge_at_once=1</create_query>
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<create_query>create table alter_select_rmt (part_id String, col_0 String) engine=ReplicatedMergeTree('/tables/{{database}}', '{{table}}') partition by part_id order by tuple() settings max_parts_to_merge_at_once=1</create_query>
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<create_query>system stop merges alter_select_{engine}</create_query>
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<fill_query>
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insert into alter_select_{engine} (part_id, col_0)
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select toString(number % 5000), 0 from numbers(10000)
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settings
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max_block_size=1,
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max_insert_threads=32,
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min_insert_block_size_rows=1,
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insert_deduplicate=false,
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parts_to_delay_insert=100000,
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parts_to_throw_insert=100000
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</fill_query>
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<fill_query>alter table alter_select_{engine} drop column col_0 settings alter_sync = 0</fill_query>
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<query>select count() from alter_select_{engine} format Null settings max_threads=1</query>
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<query>select * from alter_select_{engine} format Null settings max_threads=1</query>
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<drop_query>drop table alter_select_{engine}</drop_query>
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</test>
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