enable tidb config by default (#230)

* enable tidb config by default

pkg/task/restore.go

@@ -148,16 +148,11 @@ func RunRestore(c context.Context, g glue.Glue, cmdName string, cfg *RestoreConf
 	if err != nil {
 		return err
 	}
-	// execute DDL first
 
-	// set max-index-length before execute DDLs and create tables
-	// we set this value to max(3072*4), otherwise we might not restore table
-	// when upstream and downstream both set this value greater than default(3072)
-	conf := config.GetGlobalConfig()
-	conf.MaxIndexLength = config.DefMaxOfMaxIndexLength
-	config.StoreGlobalConfig(conf)
-	log.Warn("set max-index-length to max(3072*4) to skip check index length in DDL")
+	// pre-set TiDB config for restore
+	enableTiDBConfig()
 
+	// execute DDL first
 	err = client.ExecDDLs(ddlJobs)
 	if err != nil {
 		return errors.Trace(err)
@@ -467,3 +462,18 @@ func RunRestoreTiflashReplica(c context.Context, g glue.Glue, cmdName string, cf
 	summary.SetSuccessStatus(true)
 	return nil
 }
+
+func enableTiDBConfig() {
+	// set max-index-length before execute DDLs and create tables
+	// we set this value to max(3072*4), otherwise we might not restore table
+	// when upstream and downstream both set this value greater than default(3072)
+	conf := config.GetGlobalConfig()
+	conf.MaxIndexLength = config.DefMaxOfMaxIndexLength
+	log.Warn("set max-index-length to max(3072*4) to skip check index length in DDL")
+
+	// set this to true for some auto random DDL execute normally during incremental restore
+	conf.Experimental.AllowAutoRandom = true
+	conf.Experimental.AllowsExpressionIndex = true
+
+	config.StoreGlobalConfig(conf)
+}

tests/br_alter_pk_server/config/tidb.toml → tests/br_incompatible_tidb_config/config/tidb.toml

@@ -6,3 +6,6 @@
 lease = "360s"
 
 alter-primary-key = true
+
+max-index-length = 12288
+

tests/br_incompatible_tidb_config/run.sh

@@ -0,0 +1,98 @@
+#!/bin/bash
+#
+# Copyright 2020 PingCAP, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eu
+
+cur=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+source $cur/../_utils/run_services
+
+DB="$TEST_NAME"
+
+# prepare database
+echo "Restart cluster with alter-primary-key = true, max-index-length=12288"
+start_services "$cur"
+
+run_sql "drop schema if exists $DB;"
+run_sql "create schema $DB;"
+
+# test alter pk issue https://github.com/pingcap/br/issues/215
+TABLE="t1"
+
+run_sql "create table $DB.$TABLE (a int primary key, b int unique);"
+run_sql "insert into $DB.$TABLE values (42, 42);"
+
+# backup
+run_br --pd $PD_ADDR backup db --db "$DB" -s "local://$TEST_DIR/$DB$TABLE"
+
+# restore
+run_sql "drop schema $DB;"
+run_br --pd $PD_ADDR restore db --db "$DB" -s "local://$TEST_DIR/$DB$TABLE"
+
+run_sql "drop schema $DB;"
+run_sql "create schema $DB;"
+
+# test max-index-length issue https://github.com/pingcap/br/issues/217
+TABLE="t2"
+run_sql "create table $DB.$TABLE (a varchar(3072) primary key);"
+run_sql "insert into $DB.$TABLE values ('42');"
+
+# backup
+run_br --pd $PD_ADDR backup db --db "$DB" -s "local://$TEST_DIR/$DB$TABLE"
+
+# restore
+run_sql "drop schema $DB;"
+run_br --pd $PD_ADDR restore db --db "$DB" -s "local://$TEST_DIR/$DB$TABLE"
+
+run_sql "drop schema $DB;"
+
+# we need set auto_random to true and remove alter-primary-key otherwise we will get error
+# invalid config allow-auto-random is unavailable when alter-primary-key is enabled
+
+# enable column attribute `auto_random` to be defined on the primary key column.
+cat > $cur/config/tidb.toml << EOF
+[experimental]
+allow-auto-random = true
+EOF
+
+echo "Restart cluster with allow-auto-random=true"
+start_services "$cur"
+
+# test auto random issue issue https://github.com/pingcap/br/issues/228
+TABLE="t3"
+INCREMENTAL_TABLE="t3inc"
+run_sql "create schema $DB;"
+run_sql "create table $DB.$TABLE (a int(11) NOT NULL /*T!30100 AUTO_RANDOM(5) */, PRIMARY KEY (a))"
+run_sql "insert into $DB.$TABLE values ('42');"
+
+# Full backup
+run_br --pd $PD_ADDR backup db --db "$DB" -s "local://$TEST_DIR/$DB$TABLE"
+
+run_sql "create table $DB.$INCREMENTAL_TABLE (a int(11) NOT NULL /*T!30100 AUTO_RANDOM(5) */, PRIMARY KEY (a))"
+run_sql "insert into $DB.$INCREMENTAL_TABLE values ('42');"
+
+# incremental backup test for execute DDL
+run_br --pd $PD_ADDR backup db --db "$DB" -s "local://$TEST_DIR/$DB$INCREMENTAL_TABLE"
+
+run_sql "drop schema $DB;"
+
+# full restore
+run_br --pd $PD_ADDR restore db --db "$DB" -s "local://$TEST_DIR/$DB$TABLE"
+# incremental restore
+run_br --pd $PD_ADDR restore db --db "$DB" -s "local://$TEST_DIR/$DB$INCREMENTAL_TABLE"
+
+run_sql "drop schema $DB;"
+
+echo "Restart service with normal"
+start_services