func (sc *SchemaChanger) maybeWriteResumeSpan(
txn *client.Txn,
version sqlbase.DescriptorVersion,
resume roachpb.Span,
mutationIdx int,
lastCheckpoint *time.Time,
) error {
checkpointInterval := checkpointInterval
if sc.testingKnobs.WriteCheckpointInterval > 0 {
checkpointInterval = sc.testingKnobs.WriteCheckpointInterval
}
if timeutil.Since(*lastCheckpoint) < checkpointInterval {
return nil
}
tableDesc, err := sqlbase.GetTableDescFromID(txn, sc.tableID)
if err != nil {
return err
}
if tableDesc.Version != version {
return errVersionMismatch
}
tableDesc.Mutations[mutationIdx].ResumeSpan = resume
txn.SetSystemConfigTrigger()
if err := txn.Put(sqlbase.MakeDescMetadataKey(tableDesc.GetID()),
sqlbase.WrapDescriptor(tableDesc)); err != nil {
return err
}
*lastCheckpoint = timeutil.Now()
return nil
}
// writeCmd sums values from the env (and possibly numeric constants)
// and writes the value to the db. "c.endKey" here needs to be parsed
// in the context of this command, which is a "+"-separated list of
// keys from the env or numeric constants to sum.
func writeCmd(c *cmd, txn *client.Txn, t *testing.T) error {
sum := int64(0)
for _, sp := range strings.Split(c.endKey, "+") {
if constant, err := strconv.Atoi(sp); err != nil {
sum += c.env[sp]
} else {
sum += int64(constant)
}
}
err := txn.Put(c.getKey(), sum)
c.debug = fmt.Sprintf("[%d]", sum)
return err
}
// incCmd adds one to the value of c.key in the env (as determined by
// a previous read or write, or else assumed to be zero) and writes it
// to the db.
func incCmd(c *cmd, txn *client.Txn, t *testing.T) error {
val, ok := c.env[c.key]
if !ok {
panic(fmt.Sprintf("can't increment key %q; not yet read", c.key))
}
r := val + 1
if err := txn.Put(c.getKey(), r); err != nil {
return err
}
c.env[c.key] = r
c.debug = fmt.Sprintf("[%d]", r)
return nil
}