// deleteRow adds to the batch the kv operations necessary to delete a table row
// with the given values.
func (rd *rowDeleter) deleteRow(b *client.Batch, values []parser.Datum) error {
if err := rd.fks.checkAll(values); err != nil {
return err
}
primaryIndexKey, secondaryIndexEntries, err := rd.helper.encodeIndexes(rd.fetchColIDtoRowIndex, values)
if err != nil {
return err
}
for _, secondaryIndexEntry := range secondaryIndexEntries {
if log.V(2) {
log.Infof("Del %s", secondaryIndexEntry.Key)
}
b.Del(secondaryIndexEntry.Key)
}
// Delete the row.
rd.startKey = roachpb.Key(primaryIndexKey)
rd.endKey = roachpb.Key(encoding.EncodeNotNullDescending(primaryIndexKey))
if log.V(2) {
log.Infof("DelRange %s - %s", rd.startKey, rd.endKey)
}
b.DelRange(&rd.startKey, &rd.endKey, false)
rd.startKey, rd.endKey = nil, nil
return nil
}
// RenameDatabase renames the database.
// Privileges: security.RootUser user.
// Notes: postgres requires superuser, db owner, or "CREATEDB".
// mysql >= 5.1.23 does not allow database renames.
func (p *planner) RenameDatabase(n *parser.RenameDatabase) (planNode, error) {
if n.Name == "" || n.NewName == "" {
return nil, errEmptyDatabaseName
}
if p.session.User != security.RootUser {
return nil, fmt.Errorf("only %s is allowed to rename databases", security.RootUser)
}
dbDesc, err := p.getDatabaseDesc(string(n.Name))
if err != nil {
return nil, err
}
if dbDesc == nil {
return nil, sqlbase.NewUndefinedDatabaseError(string(n.Name))
}
if n.Name == n.NewName {
// Noop.
return &emptyNode{}, nil
}
// Now update the nameMetadataKey and the descriptor.
descKey := sqlbase.MakeDescMetadataKey(dbDesc.GetID())
dbDesc.SetName(string(n.NewName))
if err := dbDesc.Validate(); err != nil {
return nil, err
}
newKey := databaseKey{string(n.NewName)}.Key()
oldKey := databaseKey{string(n.Name)}.Key()
descID := dbDesc.GetID()
descDesc := sqlbase.WrapDescriptor(dbDesc)
b := client.Batch{}
b.CPut(newKey, descID, nil)
b.Put(descKey, descDesc)
b.Del(oldKey)
if err := p.txn.Run(&b); err != nil {
if _, ok := err.(*roachpb.ConditionFailedError); ok {
return nil, fmt.Errorf("the new database name %q already exists", string(n.NewName))
}
return nil, err
}
p.setTestingVerifyMetadata(func(systemConfig config.SystemConfig) error {
if err := expectDescriptorID(systemConfig, newKey, descID); err != nil {
return err
}
if err := expectDescriptor(systemConfig, descKey, descDesc); err != nil {
return err
}
return expectDeleted(systemConfig, oldKey)
})
return &emptyNode{}, nil
}
// flush writes all dirty nodes and the tree to the transaction.
func (tc *treeContext) flush(b *client.Batch) {
if tc.dirty {
b.Put(keys.RangeTreeRoot, tc.tree)
}
for key, cachedNode := range tc.nodes {
if cachedNode.dirty {
if cachedNode.node == nil {
b.Del(keys.RangeTreeNodeKey(roachpb.RKey(key)))
} else {
b.Put(keys.RangeTreeNodeKey(roachpb.RKey(key)), cachedNode.node)
}
}
}
}
// deleteIndexRow adds to the batch the kv operations necessary to delete a
// table row from the given index.
func (rd *rowDeleter) deleteIndexRow(
ctx context.Context, b *client.Batch, idx *sqlbase.IndexDescriptor, values []parser.Datum,
) error {
if err := rd.fks.checkAll(values); err != nil {
return err
}
secondaryIndexEntry, err := sqlbase.EncodeSecondaryIndex(
rd.helper.tableDesc, idx, rd.fetchColIDtoRowIndex, values)
if err != nil {
return err
}
if log.V(2) {
log.Infof(ctx, "Del %s", secondaryIndexEntry.Key)
}
b.Del(secondaryIndexEntry.Key)
return nil
}
func runDel(cmd *cobra.Command, args []string) {
if len(args) == 0 {
mustUsage(cmd)
return
}
var b client.Batch
for _, arg := range args {
b.Del(unquoteArg(arg, true /* disallow system keys */))
}
kvDB, stopper := makeDBClient()
defer stopper.Stop()
if err := kvDB.Run(&b); err != nil {
panicf("delete failed: %s", err)
}
}
func delMeta(b *client.Batch, key roachpb.Key, desc *roachpb.RangeDescriptor) {
b.Del(key)
}
// updateRow adds to the batch the kv operations necessary to update a table row
// with the given values.
//
// The row corresponding to oldValues is updated with the ones in updateValues.
// Note that updateValues only contains the ones that are changing.
//
// The return value is only good until the next call to UpdateRow.
func (ru *rowUpdater) updateRow(
b *client.Batch,
oldValues []parser.Datum,
updateValues []parser.Datum,
) ([]parser.Datum, error) {
if len(oldValues) != len(ru.fetchCols) {
return nil, errors.Errorf("got %d values but expected %d", len(oldValues), len(ru.fetchCols))
}
if len(updateValues) != len(ru.updateCols) {
return nil, errors.Errorf("got %d values but expected %d", len(updateValues), len(ru.updateCols))
}
primaryIndexKey, secondaryIndexEntries, err := ru.helper.encodeIndexes(ru.fetchColIDtoRowIndex, oldValues)
if err != nil {
return nil, err
}
// The secondary index entries returned by rowHelper.encodeIndexes are only
// valid until the next call to encodeIndexes. We need to copy them so that
// we can compare against the new secondary index entries.
secondaryIndexEntries = append(ru.indexEntriesBuf[:0], secondaryIndexEntries...)
ru.indexEntriesBuf = secondaryIndexEntries
// Check that the new value types match the column types. This needs to
// happen before index encoding because certain datum types (i.e. tuple)
// cannot be used as index values.
for i, val := range updateValues {
if ru.marshalled[i], err = sqlbase.MarshalColumnValue(ru.updateCols[i], val); err != nil {
return nil, err
}
}
// Update the row values.
copy(ru.newValues, oldValues)
for i, updateCol := range ru.updateCols {
ru.newValues[ru.fetchColIDtoRowIndex[updateCol.ID]] = updateValues[i]
}
rowPrimaryKeyChanged := false
var newSecondaryIndexEntries []sqlbase.IndexEntry
if ru.primaryKeyColChange {
var newPrimaryIndexKey []byte
newPrimaryIndexKey, newSecondaryIndexEntries, err =
ru.helper.encodeIndexes(ru.fetchColIDtoRowIndex, ru.newValues)
if err != nil {
return nil, err
}
rowPrimaryKeyChanged = !bytes.Equal(primaryIndexKey, newPrimaryIndexKey)
} else {
newSecondaryIndexEntries, err =
ru.helper.encodeSecondaryIndexes(ru.fetchColIDtoRowIndex, ru.newValues)
if err != nil {
return nil, err
}
}
if rowPrimaryKeyChanged {
if err := ru.fks.checkIdx(ru.helper.tableDesc.PrimaryIndex.ID, oldValues, ru.newValues); err != nil {
return nil, err
}
for i := range newSecondaryIndexEntries {
if !bytes.Equal(newSecondaryIndexEntries[i].Key, secondaryIndexEntries[i].Key) {
if err := ru.fks.checkIdx(ru.helper.indexes[i].ID, oldValues, ru.newValues); err != nil {
return nil, err
}
}
}
if err := ru.rd.deleteRow(b, oldValues); err != nil {
return nil, err
}
if err := ru.ri.insertRow(b, ru.newValues, false); err != nil {
return nil, err
}
return ru.newValues, nil
}
// Add the new values.
// TODO(dan): This has gotten very similar to the loop in insertRow, see if
// they can be DRY'd. Ideally, this would also work for
// truncateAndBackfillColumnsChunk, which is currently abusing rowUdpdater.
for i, family := range ru.helper.tableDesc.Families {
update := false
for _, colID := range family.ColumnIDs {
if _, ok := ru.updateColIDtoRowIndex[colID]; ok {
update = true
break
}
}
if !update {
continue
}
if i > 0 {
// HACK: MakeFamilyKey appends to its argument, so on every loop iteration
// after the first, trim primaryIndexKey so nothing gets overwritten.
// TODO(dan): Instead of this, use something like engine.ChunkAllocator.
primaryIndexKey = primaryIndexKey[:len(primaryIndexKey):len(primaryIndexKey)]
}
if len(family.ColumnIDs) == 1 && family.ColumnIDs[0] == family.DefaultColumnID {
// Storage optimization to store DefaultColumnID directly as a value. Also
// backwards compatible with the original BaseFormatVersion.
idx, ok := ru.updateColIDtoRowIndex[family.DefaultColumnID]
if !ok {
continue
}
ru.key = keys.MakeFamilyKey(primaryIndexKey, uint32(family.ID))
if log.V(2) {
log.Infof("Put %s -> %v", ru.key, ru.marshalled[idx].PrettyPrint())
}
b.Put(&ru.key, &ru.marshalled[idx])
ru.key = nil
continue
}
ru.key = keys.MakeFamilyKey(primaryIndexKey, uint32(family.ID))
ru.valueBuf = ru.valueBuf[:0]
var lastColID sqlbase.ColumnID
familySortedColumnIDs, ok := ru.helper.sortedColumnFamily(family.ID)
if !ok {
panic("invalid family sorted column id map")
}
for _, colID := range familySortedColumnIDs {
if ru.helper.columnInPK(colID) {
if family.ID != 0 {
return nil, errors.Errorf("primary index column %d must be in family 0, was %d", colID, family.ID)
}
// Skip primary key columns as their values are encoded in the key of
// each family. Family 0 is guaranteed to exist and acts as a sentinel.
continue
}
idx, ok := ru.fetchColIDtoRowIndex[colID]
if !ok {
return nil, errors.Errorf("column %d was expected to be fetched, but wasn't", colID)
}
col := ru.fetchCols[idx]
if ru.newValues[idx].Compare(parser.DNull) == 0 {
continue
}
if lastColID > col.ID {
panic(fmt.Errorf("cannot write column id %d after %d", col.ID, lastColID))
}
colIDDiff := col.ID - lastColID
lastColID = col.ID
ru.valueBuf, err = sqlbase.EncodeTableValue(ru.valueBuf, colIDDiff, ru.newValues[idx])
if err != nil {
return nil, err
}
}
if family.ID != 0 && len(ru.valueBuf) == 0 {
// The family might have already existed but every column in it is being
// set to NULL, so delete it.
if log.V(2) {
log.Infof("Del %s", ru.key)
}
b.Del(&ru.key)
} else {
ru.value.SetTuple(ru.valueBuf)
if log.V(2) {
log.Infof("Put %s -> %v", ru.key, ru.value.PrettyPrint())
}
b.Put(&ru.key, &ru.value)
}
ru.key = nil
}
// Update secondary indexes.
for i, newSecondaryIndexEntry := range newSecondaryIndexEntries {
secondaryIndexEntry := secondaryIndexEntries[i]
secondaryKeyChanged := !bytes.Equal(newSecondaryIndexEntry.Key, secondaryIndexEntry.Key)
if secondaryKeyChanged {
if err := ru.fks.checkIdx(ru.helper.indexes[i].ID, oldValues, ru.newValues); err != nil {
return nil, err
}
if log.V(2) {
log.Infof("Del %s", secondaryIndexEntry.Key)
}
b.Del(secondaryIndexEntry.Key)
// Do not update Indexes in the DELETE_ONLY state.
if _, ok := ru.deleteOnlyIndex[i]; !ok {
if log.V(2) {
log.Infof("CPut %s -> %v", newSecondaryIndexEntry.Key, newSecondaryIndexEntry.Value.PrettyPrint())
}
b.CPut(newSecondaryIndexEntry.Key, &newSecondaryIndexEntry.Value, nil)
}
}
}
return ru.newValues, nil
}
// Execute the entire schema change in steps. startBackfillNotification is
// called before the backfill starts; it can be nil.
func (sc SchemaChanger) exec(
startBackfillNotification func() error,
oldNameNotInUseNotification func(),
) error {
// Acquire lease.
lease, err := sc.AcquireLease()
if err != nil {
return err
}
needRelease := true
// Always try to release lease.
defer func(l *sqlbase.TableDescriptor_SchemaChangeLease) {
// If the schema changer deleted the descriptor, there's no longer a lease to be
// released.
if !needRelease {
return
}
if err := sc.ReleaseLease(*l); err != nil {
log.Warning(err)
}
}(&lease)
// Increment the version and unset tableDescriptor.UpVersion.
desc, err := sc.MaybeIncrementVersion()
if err != nil {
return err
}
if desc.GetTable().Deleted() {
lease, err = sc.ExtendLease(lease)
if err != nil {
return err
}
// Wait for everybody to see the version with the deleted bit set. When
// this returns, nobody has any leases on the table, nor can get new leases,
// so the table will no longer be modified.
if err := sc.waitToUpdateLeases(); err != nil {
return err
}
// Truncate the table and delete the descriptor.
if err := sc.truncateAndDropTable(&lease, desc.GetTable()); err != nil {
return err
}
needRelease = false
return nil
}
if desc.GetTable().Renamed() {
lease, err = sc.ExtendLease(lease)
if err != nil {
return err
}
// Wait for everyone to see the version with the new name. When this
// returns, no new transactions will be using the old name for the table, so
// the old name can now be re-used (by CREATE).
if err := sc.waitToUpdateLeases(); err != nil {
return err
}
if oldNameNotInUseNotification != nil {
oldNameNotInUseNotification()
}
// Free up the old name(s).
err := sc.db.Txn(func(txn *client.Txn) error {
b := client.Batch{}
for _, renameDetails := range desc.GetTable().Renames {
tbKey := tableKey{
sqlbase.ID(renameDetails.OldParentID), renameDetails.OldName}.Key()
b.Del(tbKey)
}
if err := txn.Run(&b); err != nil {
return err
}
return nil
})
if err != nil {
return err
}
// Clean up - clear the descriptor's state.
_, err = sc.leaseMgr.Publish(sc.tableID, func(desc *sqlbase.TableDescriptor) error {
desc.Renames = nil
return nil
}, nil)
if err != nil {
return err
}
}
// Wait for the schema change to propagate to all nodes after this function
// returns, so that the new schema is live everywhere. This is not needed for
// correctness but is done to make the UI experience/tests predictable.
defer func() {
if err := sc.waitToUpdateLeases(); err != nil {
log.Warning(err)
}
}()
if sc.mutationID == sqlbase.InvalidMutationID {
// Nothing more to do.
return nil
}
// Another transaction might set the up_version bit again,
// but we're no longer responsible for taking care of that.
// Run through mutation state machine and backfill.
err = sc.runStateMachineAndBackfill(&lease, startBackfillNotification)
// Purge the mutations if the application of the mutations failed due to
// an integrity constraint violation. All other errors are transient
// errors that are resolved by retrying the backfill.
if sqlbase.IsIntegrityConstraintError(err) {
log.Warningf("reversing schema change due to irrecoverable error: %s", err)
if errReverse := sc.reverseMutations(err); errReverse != nil {
// Although the backfill did hit an integrity constraint violation
// and made a decision to reverse the mutations,
// reverseMutations() failed. If exec() is called again the entire
// schema change will be retried.
return errReverse
}
// After this point the schema change has been reversed and any retry
// of the schema change will act upon the reversed schema change.
if errPurge := sc.runStateMachineAndBackfill(
&lease, startBackfillNotification,
); errPurge != nil {
// Don't return this error because we do want the caller to know
// that an integrity constraint was violated with the original
// schema change. The reversed schema change will be
// retried via the async schema change manager.
log.Warningf("error purging mutation: %s, after error: %s", errPurge, err)
}
}
return err
}