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schema.go
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schema.go
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/*
Copyright 2017 Google 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 agreedto in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"flag"
"time"
"golang.org/x/net/context"
"vitess.io/vitess/go/timer"
"vitess.io/vitess/go/vt/log"
"vitess.io/vitess/go/vt/logutil"
"vitess.io/vitess/go/vt/schemamanager"
"vitess.io/vitess/go/vt/servenv"
"vitess.io/vitess/go/vt/vttablet/tmclient"
"vitess.io/vitess/go/vt/wrangler"
)
var (
schemaChangeDir = flag.String("schema_change_dir", "", "directory contains schema changes for all keyspaces. Each keyspace has its own directory and schema changes are expected to live in '$KEYSPACE/input' dir. e.g. test_keyspace/input/*sql, each sql file represents a schema change")
schemaChangeController = flag.String("schema_change_controller", "", "schema change controller is responsible for finding schema changes and responsing schema change events")
schemaChangeCheckInterval = flag.Int("schema_change_check_interval", 60, "this value decides how often we check schema change dir, in seconds")
schemaChangeUser = flag.String("schema_change_user", "", "The user who submits this schema change.")
schemaChangeSlaveTimeout = flag.Duration("schema_change_slave_timeout", 10*time.Second, "how long to wait for slaves to receive the schema change")
)
func initSchema() {
// Start schema manager service if needed.
if *schemaChangeDir != "" {
interval := 60
if *schemaChangeCheckInterval > 0 {
interval = *schemaChangeCheckInterval
}
timer := timer.NewTimer(time.Duration(interval) * time.Second)
controllerFactory, err :=
schemamanager.GetControllerFactory(*schemaChangeController)
if err != nil {
log.Fatalf("unable to get a controller factory, error: %v", err)
}
timer.Start(func() {
controller, err := controllerFactory(map[string]string{
schemamanager.SchemaChangeDirName: *schemaChangeDir,
schemamanager.SchemaChangeUser: *schemaChangeUser,
})
if err != nil {
log.Errorf("failed to get controller, error: %v", err)
return
}
ctx := context.Background()
wr := wrangler.New(logutil.NewConsoleLogger(), ts, tmclient.NewTabletManagerClient())
err = schemamanager.Run(
ctx,
controller,
schemamanager.NewTabletExecutor(wr, *schemaChangeSlaveTimeout),
)
if err != nil {
log.Errorf("Schema change failed, error: %v", err)
}
})
servenv.OnClose(func() { timer.Stop() })
}
}