ClickHouse/tests/queries/0_stateless/02448_clone_replica_lost_part.sql

-- Tags: long

SET insert_keeper_fault_injection_probability=0; -- disable fault injection; part ids are non-deterministic in case of insert retries

drop table if exists rmt1;
drop table if exists rmt2;
create table rmt1 (n int) engine=ReplicatedMergeTree('/test/02448/{database}/rmt', '1') order by tuple()
    settings min_replicated_logs_to_keep=1, max_replicated_logs_to_keep=2, cleanup_delay_period=0, cleanup_delay_period_random_add=1, old_parts_lifetime=0, max_parts_to_merge_at_once=4;
create table rmt2 (n int) engine=ReplicatedMergeTree('/test/02448/{database}/rmt', '2') order by tuple()
    settings min_replicated_logs_to_keep=1, max_replicated_logs_to_keep=2, cleanup_delay_period=0, cleanup_delay_period_random_add=1, old_parts_lifetime=0, max_parts_to_merge_at_once=4;

-- insert part only on one replica
system stop replicated sends rmt1;
insert into rmt1 values (1);
detach table rmt1;      -- make replica inactive
system start replicated sends rmt1;

-- trigger log rotation, rmt1 will be lost
insert into rmt2 values (2);
insert into rmt2 values (3);
insert into rmt2 values (4);
insert into rmt2 values (5);
-- check that entry was not removed from the queue (part is not lost)
set receive_timeout=5;
system sync replica rmt2; -- {serverError TIMEOUT_EXCEEDED}
set receive_timeout=300;

select 1, arraySort(groupArray(n)) from rmt2;

-- rmt1 will mimic rmt2
attach table rmt1;
system sync replica rmt1;
system sync replica rmt2;

-- check that no parts are lost
select 2, arraySort(groupArray(n)) from rmt1;
select 3, arraySort(groupArray(n)) from rmt2;


truncate table rmt1;
truncate table rmt2;


-- insert parts only on one replica and merge them
system stop replicated sends rmt2;
insert into rmt2 values (1);
insert into rmt2 values (2);
system sync replica rmt2;
optimize table rmt2 final;
system sync replica rmt2;
-- give it a chance to remove source parts
select sleep(2) format Null; -- increases probability of reproducing the issue
detach table rmt2;
system start replicated sends rmt2;


-- trigger log rotation, rmt2 will be lost
insert into rmt1 values (3);
insert into rmt1 values (4);
insert into rmt1 values (5);
set receive_timeout=5;
-- check that entry was not removed from the queue (part is not lost)
system sync replica rmt1; -- {serverError TIMEOUT_EXCEEDED}
set receive_timeout=300;

select 4, arraySort(groupArray(n)) from rmt1;

-- rmt1 will mimic rmt2
system stop fetches rmt1;
attach table rmt2;
system sync replica rmt2;
-- give rmt2 a chance to remove merged part (but it should not do it)
select sleep(2) format Null; -- increases probability of reproducing the issue
system start fetches rmt1;
system sync replica rmt1;

-- check that no parts are lost
select 5, arraySort(groupArray(n)) from rmt1;
select 6, arraySort(groupArray(n)) from rmt2;


-- insert part only on one replica
system stop replicated sends rmt1;
insert into rmt1 values (123);
alter table rmt1 update n=10 where n=123 settings mutations_sync=1;
-- give it a chance to remove source part
select sleep(2) format Null; -- increases probability of reproducing the issue
detach table rmt1;      -- make replica inactive
system start replicated sends rmt1;

-- trigger log rotation, rmt1 will be lost
insert into rmt2 values (20);
insert into rmt2 values (30);
insert into rmt2 values (40);
insert into rmt2 values (50);
-- check that entry was not removed from the queue (part is not lost)
set receive_timeout=5;
system sync replica rmt2; -- {serverError TIMEOUT_EXCEEDED}
set receive_timeout=300;

select 7, arraySort(groupArray(n)) from rmt2;

-- rmt1 will mimic rmt2
system stop fetches rmt2;
attach table rmt1;
system sync replica rmt1;
-- give rmt1 a chance to remove mutated part (but it should not do it)
select sleep(2) format Null; -- increases probability of reproducing the issue
system start fetches rmt2;
system sync replica rmt2;

-- check that no parts are lost
select 8, arraySort(groupArray(n)) from rmt1;
select 9, arraySort(groupArray(n)) from rmt2;

-- avoid arbitrary merges after inserting
optimize table rmt2 final;
-- insert parts (all_18_18_0, all_19_19_0) on both replicas (will be deduplicated, but it does not matter)
insert into rmt1 values (100);
insert into rmt2 values (100);
insert into rmt1 values (200);
insert into rmt2 values (200);

-- otherwise we can get exception on drop part
system sync replica rmt2;
system sync replica rmt1;

detach table rmt1;

-- create a gap in block numbers by dropping part
insert into rmt2 values (300);
alter table rmt2 drop part 'all_19_19_0';   -- remove 200
insert into rmt2 values (400);
insert into rmt2 values (500);
insert into rmt2 values (600);
system sync replica rmt2;
-- merge through gap
optimize table rmt2;
-- give it a chance to cleanup log
select sleep(2) format Null; -- increases probability of reproducing the issue

-- rmt1 will mimic rmt2, but will not be able to fetch parts for a while
system stop replicated sends rmt2;
attach table rmt1;
-- rmt1 should not show the value (200) from dropped part
select throwIf(n = 200) from rmt1 format Null;
select 11, arraySort(groupArray(n)) from rmt2;

system start replicated sends rmt2;
system sync replica rmt1;
select 12, arraySort(groupArray(n)) from rmt1;

drop table rmt1;
drop table rmt2;