Re: [Tarantool-patches] [PATCH v3] replication: the truncate method called from within a transaction

[Serge Petrenko via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

25.10.2021 13:44, Yan Shtunder via Tarantool-patches пишет:
> The truncate method could be called from within a transaction. The flag
> of GROUP_LOCAL was set in truncate method after statement row had been
> being checked on the GROUP_LOCAL. Accordingly, after a local transaction
> NOP row was not appended.
>
> Closes #6123

Thanks for the patch!

Please, find 2 comments below.
> ---
> Issue: https://github.com/tarantool/tarantool/issues/6123
> Patch: https://github.com/tarantool/tarantool/tree/yshtunder/gh-6123-truncate-is-local-transaction
>
>   src/box/alter.cc                          |  5 ++
>   test/replication-luatest/gh_6123_test.lua | 62 +++++++++++++++++++++++
>   2 files changed, 67 insertions(+)
>   create mode 100644 test/replication-luatest/gh_6123_test.lua
>
> diff --git a/src/box/alter.cc b/src/box/alter.cc
> index 31ac82fc5..52b9ea4d2 100644
> --- a/src/box/alter.cc
> +++ b/src/box/alter.cc
> @@ -2914,6 +2914,11 @@ on_replace_dd_truncate(struct trigger * /* trigger */, void *event)
>   	if (space_is_temporary(old_space) ||
>   	    space_group_id(old_space) == GROUP_LOCAL) {
>   		stmt->row->group_id = GROUP_LOCAL;
> +		/*
> +		 * The trigger is invoked after txn->n_local_rows
> +		 * is counted, so don't forget to update it here.
> +		 */
> +		++txn->n_local_rows;
>   	}
>
>   	try {

The patch doesn't build on my machine. For the same reason as the other 
patch.
I suppose you'll fix that with the other patch.

> diff --git a/test/replication-luatest/gh_6123_test.lua b/test/replication-luatest/gh_6123_test.lua
> new file mode 100644
> index 000000000..d0ffa0c8b
> --- /dev/null
> +++ b/test/replication-luatest/gh_6123_test.lua

Please, find a better test name.
Like "gh_6123_truncate_temp_space_test.lua"
> @@ -0,0 +1,62 @@
> +local fio = require('fio')
> +local log = require('log')
> +local t = require('luatest')
> +local cluster = require('test.luatest_helpers.cluster')
> +local helpers = require('test.luatest_helpers.helpers')
> +
> +local g = t.group('gh-6123')
> +
> +g.before_test('test_truncate_is_local_transaction', function()
> +    g.cluster = cluster:new({})
> +
> +    local box_cfg = {
> +        replication         = {
> +            helpers.instance_uri('master')
> +        },
> +        replication_timeout = 0.1,
> +        read_only           = false
> +    }
> +
> +    g.master = g.cluster:build_server({alias = 'master'}, engine, box_cfg)
> +
> +    local box_cfg = {
> +        replication         = {
> +            helpers.instance_uri('master'),
> +            helpers.instance_uri('replica')
> +        },
> +        replication_timeout = 0.1,
> +        replication_connect_timeout = 0.5,
> +        read_only           = true
> +    }
> +
> +    g.replica = g.cluster:build_server({alias = 'replica'}, engine, box_cfg)
> +
> +    g.cluster:join_server(g.master)
> +    g.cluster:join_server(g.replica)
> +    g.cluster:start()
> +    log.info('Everything is started')
> +end)
> +
> +g.after_test('test_truncate_is_local_transaction', function()
> +    g.cluster:stop()
> +    fio.rmtree(g.master.workdir)
> +    fio.rmtree(g.replica.workdir)
> +end)
> +
> +g.test_truncate_is_local_transaction = function()
> +    g.master:eval("s = box.schema.space.create('temp', {temporary = true})")
> +    g.master:eval("s:create_index('pk')")
> +
> +    g.master:eval("s:insert{1, 2}")
> +    g.master:eval("s:insert{4}")
> +    t.assert_equals(g.master:eval("return s:select()"), {{1, 2}, {4}})
> +
> +    g.master:eval("box.begin() box.space._schema:replace{'smth'} s:truncate() box.commit()")
> +    t.assert_equals(g.master:eval("return s:select()"), {})
> +    t.assert_equals(g.master:eval("return box.space._schema:select{'smth'}"), {{'smth'}})
> +
> +    -- Checking that replica has received the last transaction,
> +    -- and that replication isn't broken.
> +    t.assert_equals(g.replica:eval("return box.space._schema:select{'smth'}"), {{'smth'}})
> +    t.assert_equals(g.replica:eval("return box.info.replication[1].upstream.status"), 'follow')
> +end
> --
> 2.25.1
>

-- 
Serge Petrenko