Merge pull request ClickHouse#79362 from azat/tests/03393_max_merge_delayed_streams_for_parallel_write

tests: fix 03393_max_merge_delayed_streams_for_parallel_write flakiness (disable for MSan)

Author: alexey-milovidov

tests/queries/0_stateless/03393_max_merge_delayed_streams_for_parallel_write.sql

@@ -1,4 +1,4 @@
--- Tags: no-fasttest, long, no-parallel, no-flaky-check
+-- Tags: no-fasttest, long, no-parallel, no-flaky-check, no-msan
 -- - no-fasttest -- S3 is required
 -- - no-flaky-check -- not compatible with ThreadFuzzer
 
@@ -10,26 +10,25 @@ engine = MergeTree
 partition by ()
 order by ()
 settings
-    -- cache has it's own problem (see filesystem_cache_prefer_bigger_buffer_size)
+    -- cache has it's own problems (see filesystem_cache_prefer_bigger_buffer_size)
     storage_policy = 's3_no_cache',
-    -- horizontal merges does opens all stream at once, so will still huge chunk of memory
+    -- horizontal merges does opens all stream at once, so will still use huge amount of memory
     min_rows_for_wide_part = 0,
     min_bytes_for_wide_part = 0,
     vertical_merge_algorithm_min_rows_to_activate = 0,
     vertical_merge_algorithm_min_columns_to_activate = 1,
     min_bytes_for_full_part_storage = 0,
     --- avoid excessive memory usage (due to default buffer size of 1MiB that is created for each column)
-    max_merge_delayed_streams_for_parallel_write = 1,
+    max_merge_delayed_streams_for_parallel_write = 100,
     -- avoid superfluous merges
     merge_selector_base = 1000
 ;
 
-SET max_execution_time = 300;
 insert into metric_log select * from generateRandom() limit 10;
 
 optimize table metric_log final;
 system flush logs part_log;
-select 'max_merge_delayed_streams_for_parallel_write=1' as test, * from system.part_log where table = 'metric_log' and database = currentDatabase() and event_date >= yesterday() and event_type = 'MergeParts' and peak_memory_usage > 100_000_000 format Vertical;
+select 'max_merge_delayed_streams_for_parallel_write=100' as test, * from system.part_log where table = 'metric_log' and database = currentDatabase() and event_date >= yesterday() and event_type = 'MergeParts' and peak_memory_usage > 1_000_000_000 format Vertical;
 
 alter table metric_log modify setting max_merge_delayed_streams_for_parallel_write = 10000;