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

Yan Shtunder ya.shtunder at gmail.com
Mon Oct 25 13:44:49 MSK 2021


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
---
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 {
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
@@ -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



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