func commandRestoreFromBackup(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("The RestoreFromBackup command requires the <tablet alias> argument.")
}
tabletAlias, err := topoproto.ParseTabletAlias(subFlags.Arg(0))
if err != nil {
return err
}
tabletInfo, err := wr.TopoServer().GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
stream, err := wr.TabletManagerClient().RestoreFromBackup(ctx, tabletInfo.Tablet)
if err != nil {
return err
}
for {
e, err := stream.Recv()
switch err {
case nil:
logutil.LogEvent(wr.Logger(), e)
case io.EOF:
return nil
default:
return err
}
}
}
func commandDemoteMaster(wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("action DemoteMaster requires <tablet alias|zk tablet path>")
}
tabletAlias, err := tabletParamToTabletAlias(subFlags.Arg(0))
if err != nil {
return err
}
tabletInfo, err := wr.TopoServer().GetTablet(tabletAlias)
if err != nil {
return err
}
return wr.TabletManagerClient().DemoteMaster(tabletInfo, wr.ActionTimeout())
}
func commandDemoteMaster(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("action DemoteMaster requires <tablet alias>")
}
tabletAlias, err := topoproto.ParseTabletAlias(subFlags.Arg(0))
if err != nil {
return err
}
tabletInfo, err := wr.TopoServer().GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
_, err = wr.TabletManagerClient().DemoteMaster(ctx, tabletInfo.Tablet)
return err
}
// 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
}
// 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
}
// executeFetchWithRetries will attempt to run ExecuteFetch for a single command, with a reasonably small timeout.
// If will keep retrying the ExecuteFetch (for a finite but longer duration) if it fails due to a timeout or a
// retriable application error.
//
// executeFetchWithRetries will also re-resolve the topology after errors, to be resistant to a reparent.
// It takes in a tablet record that it will initially attempt to write to, and will return the final tablet
// record that it used.
func executeFetchWithRetries(ctx context.Context, wr *wrangler.Wrangler, ti *topo.TabletInfo, r Resolver, shard string, command string) (*topo.TabletInfo, error) {
retryDuration := 2 * time.Hour
// We should keep retrying up until the retryCtx runs out
retryCtx, retryCancel := context.WithTimeout(ctx, retryDuration)
defer retryCancel()
// Is this current attempt a retry of a previous attempt?
isRetry := false
for {
tryCtx, cancel := context.WithTimeout(retryCtx, 2*time.Minute)
_, err := wr.TabletManagerClient().ExecuteFetchAsApp(tryCtx, ti, command, 0, false)
cancel()
if err == nil {
// success!
return ti, nil
}
// If the ExecuteFetch call failed because of an application error, we will try to figure out why.
// We need to extract the MySQL error number, and will attempt to retry if we think the error is recoverable.
match := errExtract.FindStringSubmatch(err.Error())
var errNo string
if len(match) == 2 {
errNo = match[1]
}
switch {
case wr.TabletManagerClient().IsTimeoutError(err):
wr.Logger().Warningf("ExecuteFetch failed on %v; will retry because it was a timeout error: %v", ti, err)
statsRetryCounters.Add("TimeoutError", 1)
case errNo == "1290":
wr.Logger().Warningf("ExecuteFetch failed on %v; will reresolve and retry because it's due to a MySQL read-only error: %v", ti, err)
statsRetryCounters.Add("ReadOnly", 1)
case errNo == "2002" || errNo == "2006":
wr.Logger().Warningf("ExecuteFetch failed on %v; will reresolve and retry because it's due to a MySQL connection error: %v", ti, err)
statsRetryCounters.Add("ConnectionError", 1)
case errNo == "1062":
if !isRetry {
return ti, fmt.Errorf("ExecuteFetch failed on %v on the first attempt; not retrying as this is not a recoverable error: %v", ti, err)
}
wr.Logger().Infof("ExecuteFetch failed on %v with a duplicate entry error; marking this as a success, because of the likelihood that this query has already succeeded before being retried: %v", ti, err)
return ti, nil
default:
// Unknown error
return ti, err
}
t := time.NewTimer(*executeFetchRetryTime)
// don't leak memory if the timer isn't triggered
defer t.Stop()
select {
case <-retryCtx.Done():
if retryCtx.Err() == context.DeadlineExceeded {
return ti, fmt.Errorf("failed to connect to destination tablet %v after retrying for %v", ti, retryDuration)
}
return ti, fmt.Errorf("interrupted while trying to run %v on tablet %v", command, ti)
case <-t.C:
// Re-resolve and retry 30s after the failure
err = r.ResolveDestinationMasters(ctx)
if err != nil {
return ti, fmt.Errorf("unable to re-resolve masters for ExecuteFetch, due to: %v", err)
}
ti, err = r.GetDestinationMaster(shard)
if err != nil {
// At this point, we probably don't have a valid tablet record to return
return nil, fmt.Errorf("unable to run ExecuteFetch due to: %v", err)
}
}
isRetry = true
}
}
// generateChunks 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
// whose first column is a numeric type.
func generateChunks(ctx context.Context, wr *wrangler.Wrangler, tablet *topodatapb.Tablet, td *tabletmanagerdatapb.TableDefinition, chunkCount, minRowsPerChunk int) ([]chunk, error) {
if len(td.PrimaryKeyColumns) == 0 {
// No explicit primary key. Cannot chunk the rows then.
wr.Logger().Infof("table=%v: Not splitting the table into multiple chunks because it has no primary key columns. This will reduce the performance of the clone.", td.Name)
return singleCompleteChunk, nil
}
if td.RowCount < 2*uint64(minRowsPerChunk) {
// The automatic adjustment of "chunkCount" based on "minRowsPerChunk"
// below would set "chunkCount" to less than 2 i.e. 1 or 0 chunks.
// In practice in this case there should be exactly one chunk.
// Return early in this case and notice the user about this.
wr.Logger().Infof("table=%v: Not splitting the table into multiple chunks because it has only %d rows.", td.Name, td.RowCount)
return singleCompleteChunk, nil
}
if chunkCount == 1 {
return singleCompleteChunk, 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", escape(td.PrimaryKeyColumns[0]), escape(td.PrimaryKeyColumns[0]), escape(topoproto.TabletDbName(tablet)), escape(td.Name))
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
qr, err := wr.TabletManagerClient().ExecuteFetchAsApp(shortCtx, tablet, true, []byte(query), 1)
cancel()
if err != nil {
return nil, fmt.Errorf("Cannot determine MIN and MAX of the first primary key column. ExecuteFetchAsApp: %v", err)
}
if len(qr.Rows) != 1 {
return nil, fmt.Errorf("Cannot determine MIN and MAX of the first primary key column. Zero rows were returned for the following query: %v", query)
}
result := sqltypes.Proto3ToResult(qr)
min := result.Rows[0][0].ToNative()
max := result.Rows[0][1].ToNative()
if min == nil || max == nil {
wr.Logger().Infof("table=%v: Not splitting the table into multiple chunks, min or max is NULL: %v", td.Name, qr.Rows[0])
return singleCompleteChunk, nil
}
// Determine the average number of rows per chunk for the given chunkCount.
avgRowsPerChunk := td.RowCount / uint64(chunkCount)
if avgRowsPerChunk < uint64(minRowsPerChunk) {
// Reduce the chunkCount to fulfill minRowsPerChunk.
newChunkCount := td.RowCount / uint64(minRowsPerChunk)
wr.Logger().Infof("table=%v: Reducing the number of chunks from the default %d to %d to make sure that each chunk has at least %d rows.", td.Name, chunkCount, newChunkCount, minRowsPerChunk)
chunkCount = int(newChunkCount)
}
// TODO(mberlin): Write a unit test for this part of the function.
var interval interface{}
chunks := make([]chunk, chunkCount)
switch min := min.(type) {
case int64:
max := max.(int64)
interval = (max - min) / int64(chunkCount)
if interval == 0 {
wr.Logger().Infof("table=%v: Not splitting the table into multiple chunks, interval=0: %v to %v", td.Name, min, max)
return singleCompleteChunk, nil
}
case uint64:
max := max.(uint64)
interval = (max - min) / uint64(chunkCount)
if interval == 0 {
wr.Logger().Infof("table=%v: Not splitting the table into multiple chunks, interval=0: %v to %v", td.Name, min, max)
return singleCompleteChunk, nil
}
case float64:
max := max.(float64)
interval = (max - min) / float64(chunkCount)
if interval == 0 {
wr.Logger().Infof("table=%v: Not splitting the table into multiple chunks, interval=0: %v to %v", td.Name, min, max)
return singleCompleteChunk, nil
}
default:
wr.Logger().Infof("table=%v: Not splitting the table into multiple chunks, primary key not numeric.", td.Name)
return singleCompleteChunk, nil
}
// Create chunks.
start := min
for i := 0; i < chunkCount; i++ {
end := add(start, interval)
chunk, err := toChunk(start, end, i+1, chunkCount)
if err != nil {
return nil, err
}
chunks[i] = chunk
start = end
}
// Clear out the MIN and MAX on the first and last chunk respectively
// because other shards might have smaller or higher values than the one we
// looked at.
chunks[0].start = sqltypes.NULL
chunks[chunkCount-1].end = sqltypes.NULL
return chunks, nil
}
// generateChunks 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
// whose first column is a numeric type.
func generateChunks(ctx context.Context, wr *wrangler.Wrangler, tablet *topodatapb.Tablet, td *tabletmanagerdatapb.TableDefinition, minTableSizeForSplit uint64, chunkCount int) ([]chunk, error) {
if len(td.PrimaryKeyColumns) == 0 {
// No explicit primary key. Cannot chunk the rows then.
return singleCompleteChunk, nil
}
if td.DataLength < minTableSizeForSplit {
// Table is too small to split up.
return singleCompleteChunk, nil
}
if chunkCount == 1 {
return singleCompleteChunk, 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], topoproto.TabletDbName(tablet), td.Name)
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
qr, err := wr.TabletManagerClient().ExecuteFetchAsApp(shortCtx, tablet, true, []byte(query), 1)
cancel()
if err != nil {
return nil, fmt.Errorf("Cannot determine MIN and MAX of the first primary key column. ExecuteFetchAsApp: %v", err)
}
if len(qr.Rows) != 1 {
return nil, fmt.Errorf("Cannot determine MIN and MAX of the first primary key column. Zero rows were returned for the following query: %v", query)
}
result := sqltypes.Proto3ToResult(qr)
min := result.Rows[0][0].ToNative()
max := result.Rows[0][1].ToNative()
if min == nil || max == nil {
wr.Logger().Infof("Not splitting table %v into multiple chunks, min or max is NULL: %v", td.Name, qr.Rows[0])
return singleCompleteChunk, nil
}
// TODO(mberlin): Write a unit test for this part of the function.
chunks := make([]chunk, chunkCount)
switch min := min.(type) {
case int64:
max := max.(int64)
interval := (max - min) / int64(chunkCount)
if interval == 0 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, interval=0: %v to %v", td.Name, min, max)
return singleCompleteChunk, nil
}
start := min
for i := 0; i < chunkCount; i++ {
end := start + interval
chunk, err := toChunk(start, end)
if err != nil {
return nil, err
}
chunks[i] = chunk
start = end
}
case uint64:
max := max.(uint64)
interval := (max - min) / uint64(chunkCount)
if interval == 0 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, interval=0: %v to %v", td.Name, min, max)
return singleCompleteChunk, nil
}
start := min
for i := 0; i < chunkCount; i++ {
end := start + interval
chunk, err := toChunk(start, end)
if err != nil {
return nil, err
}
chunks[i] = chunk
start = end
}
case float64:
max := max.(float64)
interval := (max - min) / float64(chunkCount)
if interval == 0 {
wr.Logger().Infof("Not splitting table %v into multiple chunks, interval=0: %v to %v", td.Name, min, max)
return singleCompleteChunk, nil
}
start := min
for i := 0; i < chunkCount; i++ {
end := start + interval
chunk, err := toChunk(start, end)
if err != nil {
return nil, err
}
chunks[i] = chunk
start = end
}
default:
wr.Logger().Infof("Not splitting table %v into multiple chunks, primary key not numeric.", td.Name)
return singleCompleteChunk, nil
}
// Clear out the MIN and MAX on the first and last chunk respectively
// because other shards might have smaller or higher values than the one we
// looked at.
chunks[0].start = sqltypes.NULL
chunks[chunkCount-1].end = sqltypes.NULL
return chunks, 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
}