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35 lines
1.6 KiB
SQL
35 lines
1.6 KiB
SQL
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create table mut (n int) engine=ReplicatedMergeTree('/test/02440/{database}/mut', '1') order by tuple();
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set insert_keeper_fault_injection_probability=0;
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insert into mut values (1);
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system stop merges mut;
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alter table mut update n = 2 where n = 1;
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-- it will create MUTATE_PART entry, but will not execute it
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system sync replica mut pull;
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select mutation_id, command, parts_to_do_names, is_done from system.mutations where database=currentDatabase() and table='mut';
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-- merges (and mutations) will start again after detach/attach, we need to avoid this somehow...
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create table tmp (n int) engine=MergeTree order by tuple() settings index_granularity=1;
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insert into tmp select * from numbers(1000);
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alter table tmp update n = sleepEachRow(1) where 1;
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select sleepEachRow(2) as higher_probablility_of_reproducing_the_issue format Null;
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-- it will not execute MUTATE_PART, because another mutation is currently executing (in tmp)
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alter table mut modify setting max_number_of_mutations_for_replica=1;
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detach table mut;
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attach table mut;
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-- mutation should not be finished yet
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select * from mut;
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select mutation_id, command, parts_to_do_names, is_done from system.mutations where database=currentDatabase() and table='mut';
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alter table mut modify setting max_number_of_mutations_for_replica=100;
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system sync replica mut;
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-- and now it should (is_done may be 0, but it's okay)
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select * from mut;
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select mutation_id, command, parts_to_do_names from system.mutations where database=currentDatabase() and table='mut';
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drop table tmp; -- btw, it will check that mutation can be cancelled between blocks on shutdown
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