[Tarantool-patches] [PATCH v2 2/3] test: add a test for wal_cleanup_delay option

[Vladislav Shpilevoy]

I appreciate the work you did here!

See 4 comments below.

> diff --git a/test/replication/gh-5806-xlog-cleanup.result b/test/replication/gh-5806-xlog-cleanup.result
> new file mode 100644
> index 000000000..26e7519fc
> --- /dev/null
> +++ b/test/replication/gh-5806-xlog-cleanup.result
> @@ -0,0 +1,397 @@
> +--
> +-- Keep small number of snaps to force cleanup
> +-- procedure be more intensive.
> +box.cfg{checkpoint_count = 1}
> + | ---
> + | ...
> +
> +engine = test_run:get_cfg('engine')
> + | ---
> + | ...
> +s = box.schema.space.create('test', {engine = engine})
> + | ---
> + | ...
> +_ = s:create_index('pk')
> + | ---
> + | ...
> +
> +test_run:switch('default')
> + | ---
> + | - true
> + | ...
> +test_run:cmd('create server replica with rpl_master=master,\
> +              script="replication/gh-5806-slave.lua"')
> + | ---
> + | - true
> + | ...
> +test_run:cmd('start server replica with wait=True, wait_load=True')
> + | ---
> + | - true
> + | ...
> +
> +--
> +-- On replica we create an own space which allows us to
> +-- use more complex scenario and disableds replica from

1. disableds -> disables.

2. Please, be more specific. Why does it prevent from automatic
rejoin? Because it would lead to loss of the replica's own
data.

> +-- automatic rejoin. Otherwise XlogGapError won't happen.
> +test_run:switch('replica')
> + | ---
> + | - true
> + | ...
> +box.cfg{checkpoint_count = 1}
> + | ---
> + | ...
> +s = box.schema.space.create('testtemp', {temporary = true})

3. Why do you need it to be temporary = true?

> + | ---
> + | ...
> +_ = s:create_index('pk')
> + | ---
> + | ...
> +box.space.testtemp:insert({1})
> + | ---
> + | - [1]
> + | ...
> +box.snapshot()
> + | ---
> + | - ok
> + | ...
> +box.space.testtemp:insert({2})
> + | ---
> + | - [2]
> + | ...
> +box.snapshot()
> + | ---
> + | - ok
> + | ...
> +
> +--
> +-- Stop the replica node and generate
> +-- first range of xlogs on the master.
> +test_run:switch('default')
> + | ---
> + | - true
> + | ...
> +test_run:cmd('stop server replica')
> + | ---
> + | - true
> + | ...
> +
> +test_run:switch('master')
> + | ---
> + | - true
> + | ...
> +box.space.test:insert({1})
> + | ---
> + | - [1]
> + | ...
> +box.snapshot()
> + | ---
> + | - ok
> + | ...
> +box.space.test:insert({2})
> + | ---
> + | - [2]
> + | ...
> +box.snapshot()
> + | ---
> + | - ok
> + | ...
> +
> +--
> +-- Restart the master and generate the
> +-- next range of xlogs.

4. I think I already asked, but why do you need to restart the
master and generate a second pair of snapshots? Why isn't it enough
to have 1 pair created before the restart? Whatever is the answer,
it must be in the comments.

> +test_run:switch('default')
> + | ---
> + | - true
> + | ...