fix(test): fix unsplittable_tables test (#3630)

* debug

* fix unsplittable_tables

Author: wlwilliamx

tests/integration_tests/unsplittable_tables/run.sh

@@ -21,11 +21,13 @@ function run() {
 	run_cdc_server --workdir $WORK_DIR --binary $CDC_BINARY
 
 	SINK_URI="mysql://root:@127.0.0.1:3306/"
-	cdc_cli_changefeed create --sink-uri="$SINK_URI" -c "test" --config="$CUR/conf/changefeed.toml"
 
 	run_sql "use test;create table t1 (a int primary key, b int, unique key uk(b));" ${UP_TIDB_HOST} ${UP_TIDB_PORT}
+	run_sql "use test;create table t1 (a int primary key, b int, unique key uk(b));" ${DOWN_TIDB_HOST} ${DOWN_TIDB_PORT}
 	run_sql "split table test.t1 between (1) and (100000) regions 50;" ${UP_TIDB_HOST} ${UP_TIDB_PORT}
 
+	cdc_cli_changefeed create --sink-uri="$SINK_URI" -c "test" --config="$CUR/conf/changefeed.toml"
+
 	sleep 60 # sleep enough for try to split table
 	check_sync_diff $WORK_DIR $CUR/conf/diff_config.toml 50
 
@@ -49,6 +51,7 @@ function run_for_force_split() {
 	SINK_URI="mysql://root:@127.0.0.1:3306/"
 
 	run_sql "use test;create table t1 (a int primary key, b int, unique key uk(b));" ${UP_TIDB_HOST} ${UP_TIDB_PORT}
+	run_sql "use test;create table t1 (a int primary key, b int, unique key uk(b));" ${DOWN_TIDB_HOST} ${DOWN_TIDB_PORT}
 	run_sql "split table test.t1 between (1) and (100000) regions 50;" ${UP_TIDB_HOST} ${UP_TIDB_PORT}
 
 	sleep 10