func (client *fakeTabletManagerClient) GetSchema(ctx context.Context, tablet *topo.TabletInfo, tables, excludeTables []string, includeViews bool) (*proto.SchemaDefinition, error) {
result, ok := client.schemaDefinitions[tablet.DbName()]
if !ok {
return nil, fmt.Errorf("unknown database: %s", tablet.DbName())
}
return result, nil
}
// applySQLShard applies a given SQL change on a given tablet alias. It allows executing arbitrary
// SQL statements, but doesn't return any results, so it's only useful for SQL statements
// that would be run for their effects (e.g., CREATE).
// It works by applying the SQL statement on the shard's master tablet with replication turned on.
// Thus it should be used only for changes that can be applied on a live instance without causing issues;
// it shouldn't be used for anything that will require a pivot.
// The SQL statement string is expected to have {{.DatabaseName}} in place of the actual db name.
func (wr *Wrangler) applySQLShard(ctx context.Context, tabletInfo *topo.TabletInfo, change string, reloadSchema bool) error {
filledChange, err := fillStringTemplate(change, map[string]string{"DatabaseName": tabletInfo.DbName()})
if err != nil {
return fmt.Errorf("fillStringTemplate failed: %v", err)
}
ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
defer cancel()
// Need to make sure that we enable binlog, since we're only applying the statement on masters.
_, err = wr.tmc.ExecuteFetchAsDba(ctx, tabletInfo, filledChange, 0, false, false, reloadSchema)
return err
}
// ExecuteFetchAsDba is part of the tmclient.TabletManagerClient interface
func (client *GoRPCTabletManagerClient) ExecuteFetchAsDba(ctx context.Context, tablet *topo.TabletInfo, query string, maxRows int, wantFields, disableBinlogs, reloadSchema bool) (*mproto.QueryResult, error) {
var qr mproto.QueryResult
if err := client.rpcCallTablet(ctx, tablet, actionnode.TabletActionExecuteFetchAsDba, &gorpcproto.ExecuteFetchArgs{
Query: query,
DbName: tablet.DbName(),
MaxRows: maxRows,
WantFields: wantFields,
DisableBinlogs: disableBinlogs,
ReloadSchema: reloadSchema,
}, &qr); err != nil {
return nil, err
}
return &qr, nil
}
// ExecuteFetchAsDba is part of the tmclient.TabletManagerClient interface
func (client *Client) ExecuteFetchAsDba(ctx context.Context, tablet *topo.TabletInfo, query string, maxRows int, disableBinlogs, reloadSchema bool) (*querypb.QueryResult, error) {
cc, c, err := client.dial(ctx, tablet)
if err != nil {
return nil, err
}
defer cc.Close()
response, err := c.ExecuteFetchAsDba(ctx, &tabletmanagerdatapb.ExecuteFetchAsDbaRequest{
Query: query,
DbName: tablet.DbName(),
MaxRows: uint64(maxRows),
DisableBinlogs: disableBinlogs,
ReloadSchema: reloadSchema,
})
if err != nil {
return nil, err
}
return response.Result, nil
}
// ExecuteFetchAsDba is part of the tmclient.TabletManagerClient interface
func (client *Client) ExecuteFetchAsDba(ctx context.Context, tablet *topo.TabletInfo, query string, maxRows int, wantFields, disableBinlogs, reloadSchema bool) (*mproto.QueryResult, error) {
cc, c, err := client.dial(ctx, tablet)
if err != nil {
return nil, err
}
defer cc.Close()
response, err := c.ExecuteFetchAsDba(ctx, &pb.ExecuteFetchAsDbaRequest{
Query: query,
DbName: tablet.DbName(),
MaxRows: uint64(maxRows),
WantFields: wantFields,
DisableBinlogs: disableBinlogs,
ReloadSchema: reloadSchema,
})
if err != nil {
return nil, err
}
return mproto.Proto3ToQueryResult(response.Result), nil
}
// executeFetchLoop loops over the provided insertChannel
// and sends the commands to the provided tablet.
func executeFetchLoop(wr *wrangler.Wrangler, ti *topo.TabletInfo, insertChannel chan string, abort chan struct{}) error {
for {
select {
case cmd, ok := <-insertChannel:
if !ok {
// no more to read, we're done
return nil
}
cmd = "INSERT INTO `" + ti.DbName() + "`." + cmd
_, err := wr.TabletManagerClient().ExecuteFetch(ti, cmd, 0, false, true, 30*time.Second)
if err != nil {
return fmt.Errorf("ExecuteFetch failed: %v", err)
}
case <-abort:
// FIXME(alainjobart): note this select case
// could be starved here, and we might miss
// the abort in some corner cases.
return nil
}
}
}
// runSqlCommands will send the sql commands to the remote tablet.
func runSqlCommands(wr *wrangler.Wrangler, ti *topo.TabletInfo, commands []string, abort chan struct{}) error {
for _, command := range commands {
command, err := fillStringTemplate(command, map[string]string{"DatabaseName": ti.DbName()})
if err != nil {
return fmt.Errorf("fillStringTemplate failed: %v", err)
}
_, err = wr.TabletManagerClient().ExecuteFetch(ti, command, 0, false, true, 30*time.Second)
if err != nil {
return err
}
// check on abort
select {
case <-abort:
return nil
default:
break
}
}
return nil
}
func (vscw *VerticalSplitCloneWorker) runSqlCommands(ti *topo.TabletInfo, commands []string, abort chan struct{}) error {
for _, command := range commands {
command, err := fillStringTemplate(command, map[string]string{"DatabaseName": ti.DbName()})
if err != nil {
return fmt.Errorf("fillStringTemplate failed: %v", err)
}
_, err = vscw.wr.ActionInitiator().ExecuteFetch(ti, command, 0, false, true, 30*time.Second)
if err != nil {
return err
}
// check on abort
select {
case <-abort:
return nil
default:
break
}
}
return nil
}
// FindChunks returns an array of chunks to use for splitting up a table
// into multiple data chunks. It only works for tables with a primary key
// (and the primary key first column is an integer type).
// The array will always look like:
// "", "value1", "value2", ""
// A non-split tablet will just return:
// "", ""
func FindChunks(ctx context.Context, wr *wrangler.Wrangler, ti *topo.TabletInfo, td *myproto.TableDefinition, minTableSizeForSplit uint64, sourceReaderCount int) ([]string, error) {
result := []string{"", ""}
// eliminate a few cases we don't split tables for
if len(td.PrimaryKeyColumns) == 0 {
// no primary key, what can we do?
return result, nil
}
if td.DataLength < minTableSizeForSplit {
// table is too small to split up
return result, nil
}
// get the min and max of the leading column of the primary key
query := fmt.Sprintf("SELECT MIN(%v), MAX(%v) FROM %v.%v", td.PrimaryKeyColumns[0], td.PrimaryKeyColumns[0], ti.DbName(), td.Name)
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
qr, err := wr.TabletManagerClient().ExecuteFetchAsApp(shortCtx, ti, query, 1, true)
cancel()
if err != nil {
return nil, fmt.Errorf("ExecuteFetchAsApp: %v", err)
}
if len(qr.Rows) != 1 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot get min and max", td.Name)
return result, nil
}
if qr.Rows[0][0].IsNull() || qr.Rows[0][1].IsNull() {
wr.Logger().Infof("Not splitting table %v into multiple chunks, min or max is NULL: %v %v", td.Name, qr.Rows[0][0], qr.Rows[0][1])
return result, nil
}
switch qr.Fields[0].Type {
case mproto.VT_TINY, mproto.VT_SHORT, mproto.VT_LONG, mproto.VT_LONGLONG, mproto.VT_INT24:
minNumeric := sqltypes.MakeNumeric(qr.Rows[0][0].Raw())
maxNumeric := sqltypes.MakeNumeric(qr.Rows[0][1].Raw())
if (qr.Fields[0].Flags & mproto.VT_UNSIGNED_FLAG) == 0 {
// signed values, use int64
min, err := minNumeric.ParseInt64()
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert min: %v %v", td.Name, minNumeric, err)
return result, nil
}
max, err := maxNumeric.ParseInt64()
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert max: %v %v", td.Name, maxNumeric, err)
return result, nil
}
interval := (max - min) / int64(sourceReaderCount)
if interval == 0 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, interval=0: %v %v", td.Name, max, min)
return result, nil
}
result = make([]string, sourceReaderCount+1)
result[0] = ""
result[sourceReaderCount] = ""
for i := int64(1); i < int64(sourceReaderCount); i++ {
result[i] = fmt.Sprintf("%v", min+interval*i)
}
return result, nil
}
// unsigned values, use uint64
min, err := minNumeric.ParseUint64()
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert min: %v %v", td.Name, minNumeric, err)
return result, nil
}
max, err := maxNumeric.ParseUint64()
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert max: %v %v", td.Name, maxNumeric, err)
return result, nil
}
interval := (max - min) / uint64(sourceReaderCount)
if interval == 0 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, interval=0: %v %v", td.Name, max, min)
return result, nil
}
result = make([]string, sourceReaderCount+1)
result[0] = ""
result[sourceReaderCount] = ""
for i := uint64(1); i < uint64(sourceReaderCount); i++ {
result[i] = fmt.Sprintf("%v", min+interval*i)
}
return result, nil
case mproto.VT_FLOAT, mproto.VT_DOUBLE:
min, err := strconv.ParseFloat(qr.Rows[0][0].String(), 64)
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert min: %v %v", td.Name, qr.Rows[0][0], err)
return result, nil
}
max, err := strconv.ParseFloat(qr.Rows[0][1].String(), 64)
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert max: %v %v", td.Name, qr.Rows[0][1].String(), err)
return result, nil
}
interval := (max - min) / float64(sourceReaderCount)
if interval == 0 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, interval=0: %v %v", td.Name, max, min)
return result, nil
}
result = make([]string, sourceReaderCount+1)
result[0] = ""
result[sourceReaderCount] = ""
for i := 1; i < sourceReaderCount; i++ {
result[i] = fmt.Sprintf("%v", min+interval*float64(i))
}
return result, nil
}
wr.Logger().Infof("Not splitting table %v into multiple chunks, primary key not numeric", td.Name)
return result, nil
}
// FindChunks returns an array of chunks to use for splitting up a table
// into multiple data chunks. It only works for tables with a primary key
// (and the primary key first column is an integer type).
// The array will always look like:
// "", "value1", "value2", ""
// A non-split tablet will just return:
// "", ""
func FindChunks(ctx context.Context, wr *wrangler.Wrangler, ti *topo.TabletInfo, td *tabletmanagerdatapb.TableDefinition, minTableSizeForSplit uint64, sourceReaderCount int) ([]string, error) {
result := []string{"", ""}
// eliminate a few cases we don't split tables for
if len(td.PrimaryKeyColumns) == 0 {
// no primary key, what can we do?
return result, nil
}
if td.DataLength < minTableSizeForSplit {
// table is too small to split up
return result, nil
}
// get the min and max of the leading column of the primary key
query := fmt.Sprintf("SELECT MIN(%v), MAX(%v) FROM %v.%v", td.PrimaryKeyColumns[0], td.PrimaryKeyColumns[0], ti.DbName(), td.Name)
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
qr, err := wr.TabletManagerClient().ExecuteFetchAsApp(shortCtx, ti, query, 1, true)
cancel()
if err != nil {
return nil, fmt.Errorf("ExecuteFetchAsApp: %v", err)
}
if len(qr.Rows) != 1 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot get min and max", td.Name)
return result, nil
}
// FIXME(alainjobart) this code is a bit clunky. I'd like to
// convert the first row into an array of Values, and then
// see which type they are and go from there. Can only happen after
// Value has a full type.
l0 := qr.Rows[0].Lengths[0]
l1 := qr.Rows[0].Lengths[1]
if l0 < 0 || l1 < 0 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, min or max is NULL: %v", td.Name, qr.Rows[0])
return result, nil
}
minValue := qr.Rows[0].Values[:l0]
maxValue := qr.Rows[0].Values[l0 : l0+l1]
switch {
case sqltypes.IsSigned(qr.Fields[0].Type):
minNumeric := sqltypes.MakeNumeric(minValue)
maxNumeric := sqltypes.MakeNumeric(maxValue)
min, err := minNumeric.ParseInt64()
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert min: %v %v", td.Name, minNumeric, err)
return result, nil
}
max, err := maxNumeric.ParseInt64()
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert max: %v %v", td.Name, maxNumeric, err)
return result, nil
}
interval := (max - min) / int64(sourceReaderCount)
if interval == 0 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, interval=0: %v %v", td.Name, max, min)
return result, nil
}
result = make([]string, sourceReaderCount+1)
result[0] = ""
result[sourceReaderCount] = ""
for i := int64(1); i < int64(sourceReaderCount); i++ {
result[i] = fmt.Sprintf("%v", min+interval*i)
}
return result, nil
case sqltypes.IsUnsigned(qr.Fields[0].Type):
minNumeric := sqltypes.MakeNumeric(minValue)
maxNumeric := sqltypes.MakeNumeric(maxValue)
min, err := minNumeric.ParseUint64()
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert min: %v %v", td.Name, minNumeric, err)
return result, nil
}
max, err := maxNumeric.ParseUint64()
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert max: %v %v", td.Name, maxNumeric, err)
return result, nil
}
interval := (max - min) / uint64(sourceReaderCount)
if interval == 0 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, interval=0: %v %v", td.Name, max, min)
return result, nil
}
result = make([]string, sourceReaderCount+1)
result[0] = ""
result[sourceReaderCount] = ""
for i := uint64(1); i < uint64(sourceReaderCount); i++ {
result[i] = fmt.Sprintf("%v", min+interval*i)
}
return result, nil
case sqltypes.IsFloat(qr.Fields[0].Type):
min, err := strconv.ParseFloat(string(minValue), 64)
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert min: %v %v", td.Name, string(minValue), err)
return result, nil
}
max, err := strconv.ParseFloat(string(maxValue), 64)
if err != nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, cannot convert max: %v %v", td.Name, string(maxValue), err)
return result, nil
}
interval := (max - min) / float64(sourceReaderCount)
if interval == 0 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, interval=0: %v %v", td.Name, max, min)
return result, nil
}
result = make([]string, sourceReaderCount+1)
result[0] = ""
result[sourceReaderCount] = ""
for i := 1; i < sourceReaderCount; i++ {
result[i] = fmt.Sprintf("%v", min+interval*float64(i))
}
return result, nil
}
wr.Logger().Infof("Not splitting table %v into multiple chunks, primary key not numeric", td.Name)
return result, nil
}
// findChunks returns an array of chunks to use for splitting up a table
// into multiple data chunks. It only works for tables with a primary key
// (and the primary key first column is an integer type).
// The array will always look like:
// "", "value1", "value2", ""
// A non-split tablet will just return:
// "", ""
func (vscw *VerticalSplitCloneWorker) findChunks(ti *topo.TabletInfo, td myproto.TableDefinition) ([]string, error) {
result := []string{"", ""}
// eliminate a few cases we don't split tables for
if len(td.PrimaryKeyColumns) == 0 {
// no primary key, what can we do?
return result, nil
}
if td.DataLength < vscw.minTableSizeForSplit {
// table is too small to split up
return result, nil
}
// get the min and max of the leading column of the primary key
query := fmt.Sprintf("SELECT MIN(%v), MAX(%v) FROM %v.%v", td.PrimaryKeyColumns[0], td.PrimaryKeyColumns[0], ti.DbName(), td.Name)
qr, err := vscw.wr.ActionInitiator().ExecuteFetch(ti, query, 1, true, false, 30*time.Second)
if err != nil {
log.Infof("Not splitting table %v into multiple chunks: %v", td.Name, err)
return result, nil
}
if len(qr.Rows) != 1 {
log.Infof("Not splitting table %v into multiple chunks, cannot get min and max", td.Name)
return result, nil
}
if qr.Rows[0][0].IsNull() || qr.Rows[0][1].IsNull() {
log.Infof("Not splitting table %v into multiple chunks, min or max is NULL: %v %v", td.Name, qr.Rows[0][0], qr.Rows[0][1])
return result, nil
}
switch qr.Fields[0].Type {
case mproto.VT_TINY, mproto.VT_SHORT, mproto.VT_LONG, mproto.VT_LONGLONG, mproto.VT_INT24:
minNumeric := sqltypes.MakeNumeric(qr.Rows[0][0].Raw())
maxNumeric := sqltypes.MakeNumeric(qr.Rows[0][1].Raw())
if qr.Rows[0][0].Raw()[0] == '-' {
// signed values, use int64
min, err := minNumeric.ParseInt64()
if err != nil {
log.Infof("Not splitting table %v into multiple chunks, cannot convert min: %v %v", td.Name, minNumeric, err)
return result, nil
}
max, err := maxNumeric.ParseInt64()
if err != nil {
log.Infof("Not splitting table %v into multiple chunks, cannot convert max: %v %v", td.Name, maxNumeric, err)
return result, nil
}
interval := (max - min) / int64(vscw.sourceReaderCount)
if interval == 0 {
log.Infof("Not splitting table %v into multiple chunks, interval=0: %v %v", max, min)
return result, nil
}
result = make([]string, vscw.sourceReaderCount+1)
result[0] = ""
result[vscw.sourceReaderCount] = ""
for i := int64(1); i < int64(vscw.sourceReaderCount); i++ {
result[i] = fmt.Sprintf("%v", min+interval*i)
}
return result, nil
}
// unsigned values, use uint64
min, err := minNumeric.ParseUint64()
if err != nil {
log.Infof("Not splitting table %v into multiple chunks, cannot convert min: %v %v", td.Name, minNumeric, err)
return result, nil
}
max, err := maxNumeric.ParseUint64()
if err != nil {
log.Infof("Not splitting table %v into multiple chunks, cannot convert max: %v %v", td.Name, maxNumeric, err)
return result, nil
}
interval := (max - min) / uint64(vscw.sourceReaderCount)
if interval == 0 {
log.Infof("Not splitting table %v into multiple chunks, interval=0: %v %v", max, min)
return result, nil
}
result = make([]string, vscw.sourceReaderCount+1)
result[0] = ""
result[vscw.sourceReaderCount] = ""
for i := uint64(1); i < uint64(vscw.sourceReaderCount); i++ {
result[i] = fmt.Sprintf("%v", min+interval*i)
}
return result, nil
case mproto.VT_FLOAT, mproto.VT_DOUBLE:
min, err := strconv.ParseFloat(qr.Rows[0][0].String(), 64)
if err != nil {
log.Infof("Not splitting table %v into multiple chunks, cannot convert min: %v %v", td.Name, qr.Rows[0][0], err)
return result, nil
}
max, err := strconv.ParseFloat(qr.Rows[0][1].String(), 64)
if err != nil {
log.Infof("Not splitting table %v into multiple chunks, cannot convert max: %v %v", td.Name, qr.Rows[0][1].String(), err)
return result, nil
}
interval := (max - min) / float64(vscw.sourceReaderCount)
if interval == 0 {
log.Infof("Not splitting table %v into multiple chunks, interval=0: %v %v", max, min)
return result, nil
}
result = make([]string, vscw.sourceReaderCount+1)
result[0] = ""
result[vscw.sourceReaderCount] = ""
for i := 1; i < vscw.sourceReaderCount; i++ {
result[i] = fmt.Sprintf("%v", min+interval*float64(i))
}
return result, nil
}
log.Infof("Not splitting table %v into multiple chunks, primary key not numeric", td.Name)
return result, nil
}