forked from vitessio/vitess
/
schema.go
62 lines (56 loc) · 2.32 KB
/
schema.go
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package main
import (
"flag"
"time"
"golang.org/x/net/context"
log "github.com/golang/glog"
"github.com/youtube/vitess/go/timer"
"github.com/youtube/vitess/go/vt/logutil"
"github.com/youtube/vitess/go/vt/schemamanager"
"github.com/youtube/vitess/go/vt/servenv"
"github.com/youtube/vitess/go/vt/vttablet/tmclient"
"github.com/youtube/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() })
}
}