TODO: cleanupThread.

TODO: support downgrade scenario.

TODO: support downgrade scenario.

Done.

TODO: cleanupThread.

Done.

Build check:

Build failed without build log. It's inner CI problem. Maybe something wrong with docker or host. Just wait for build restart.

@nikitamikhaylov

I have found that the new behaviour in test test_quorum_inserts/test.py::test_insert_quorum_with_ttl is absolutely correct.

Old behaviour:

insert_quorum = 2
two replicas: 0 and 1

create table on replica 0 and 1
replica 0 becomes leader
stop fetches on replica 1
insert on replica 0
quorum is not satisfied
replica 0 cannot assign merges because quorum is not satisfied
resume fetches on replica 1
replica 1 downloaded part and quorum is satisfied
replica 0 can assign merges but sleeps from previous attempt
replica 1 cannot assign merges because it's not a leader
data is not merged and SELECT returns 1 row

New behaviour:

insert_quorum = 2
two replicas: 0 and 1

create table on replica 0 and 1
replica 0 becomes leader
replica 1 also becomes leader
stop fetches on replica 1
insert on replica 0
quorum is not satisfied
replica 0 cannot assign merges because quorum is not satisfied
replica 1 cannot assign merges because there are no parts
resume fetches on replica 1
replica 1 downloaded part and quorum is satisfied
replica 1 start to assign merges immediately
replica 1 assigned merge because quorum is satisfied and merged part from 1 to 0 rows
replica 0 pulls logs from queue and performs the same merge
data is merged and SELECT returns 0 rows

Build check:

Build failed without build log. It's inner CI problem. Maybe something wrong with docker or host. Just wait for build restart.

Build check:

Build failed without build log. It's inner CI problem. Maybe something wrong with docker or host. Just wait for build restart.

It started to be annoying.