示例#1
0
文件: db.go 项目: danieldeb/cockroach
// Open creates a new database handle to the cockroach cluster specified by
// addr. The cluster is identified by a URL with the format:
//
//   [<sender>:]//[<user>@]<host>:<port>[?certs=<dir>,priority=<val>]
//
// The URL scheme (<sender>) specifies which transport to use for talking to
// the cockroach cluster. Currently allowable values are: http, https, rpc,
// rpcs. The rpc and rpcs senders use a variant of Go's builtin rpc library for
// communication with the cluster. This protocol is lower overhead and more
// efficient than http. The decision between the encrypted (https, rpcs) and
// unencrypted senders (http, rpc) depends on the settings of the cluster. A
// given cluster supports either encrypted or unencrypted traffic, but not
// both.
//
// If not specified, the <user> field defaults to "root".
//
// The certs parameter can be used to override the default directory to use for
// client certificates. In tests, the directory "test_certs" uses the embedded
// test certificates.
//
// The priority parameter can be used to override the default priority for
// operations.
func Open(stopper *stop.Stopper, addr string) (*DB, error) {
	u, err := url.Parse(addr)
	if err != nil {
		return nil, err
	}
	ctx := &base.Context{}
	ctx.InitDefaults()
	if u.User != nil {
		ctx.User = u.User.Username()
	}

	q := u.Query()
	if dir := q["certs"]; len(dir) > 0 {
		ctx.Certs = dir[0]
	}

	sender, err := newSender(u, ctx, stopper)
	if err != nil {
		return nil, err
	}
	if sender == nil {
		return nil, fmt.Errorf("\"%s\" no sender specified", addr)
	}

	db := &DB{
		sender:          sender,
		userPriority:    roachpb.NormalUserPriority,
		txnRetryOptions: DefaultTxnRetryOptions,
	}

	if priority := q["priority"]; len(priority) > 0 {
		p, err := strconv.ParseFloat(priority[0], 64)
		if err != nil {
			return nil, err
		}
		db.userPriority = roachpb.UserPriority(p)
	}

	return db, nil
}
示例#2
0
// TestSetPriority verifies that the batch UserPriority is correctly set
// depending on the transaction priority.
func TestSetPriority(t *testing.T) {
	defer leaktest.AfterTest(t)()

	var expected roachpb.UserPriority

	db := NewDB(newTestSender(
		func(ba roachpb.BatchRequest) (*roachpb.BatchResponse, *roachpb.Error) {
			if ba.UserPriority != expected {
				pErr := roachpb.NewErrorf("Priority not set correctly in the batch! "+
					"(expected: %s, value: %s)", expected, ba.UserPriority)
				return nil, pErr
			}

			br := &roachpb.BatchResponse{}
			br.Txn = &roachpb.Transaction{}
			br.Txn.Update(ba.Txn) // copy
			return br, nil
		}, nil))

	// Verify the normal priority setting path.
	expected = roachpb.HighUserPriority
	txn := NewTxn(context.Background(), *db)
	if err := txn.SetUserPriority(expected); err != nil {
		t.Fatal(err)
	}
	if _, pErr := txn.db.sender.Send(context.Background(), roachpb.BatchRequest{}); pErr != nil {
		t.Fatal(pErr)
	}

	// Verify the internal (fixed value) priority setting path.
	expected = roachpb.UserPriority(-13)
	txn = NewTxn(context.Background(), *db)
	txn.InternalSetPriority(13)
	if _, pErr := txn.db.sender.Send(context.Background(), roachpb.BatchRequest{}); pErr != nil {
		t.Fatal(pErr)
	}
}
// TestTxnPutOutOfOrder tests a case where a put operation of an older
// timestamp comes after a put operation of a newer timestamp in a
// txn. The test ensures such an out-of-order put succeeds and
// overrides an old value. The test uses a "Writer" and a "Reader"
// to reproduce an out-of-order put.
//
// 1) The Writer executes a put operation and writes a write intent with
//    time T in a txn.
// 2) Before the Writer's txn is committed, the Reader sends a high priority
//    get operation with time T+100. This pushes the Writer txn timestamp to
//    T+100 and triggers the restart of the Writer's txn. The original
//    write intent timestamp is also updated to T+100.
// 3) The Writer starts a new epoch of the txn, but before it writes, the
//    Reader sends another high priority get operation with time T+200. This
//    pushes the Writer txn timestamp to T+200 to trigger a restart of the
//    Writer txn. The Writer will not actually restart until it tries to commit
//    the current epoch of the transaction. The Reader updates the timestamp of
//    the write intent to T+200. The test deliberately fails the Reader get
//    operation, and cockroach doesn't update its read timestamp cache.
// 4) The Writer executes the put operation again. This put operation comes
//    out-of-order since its timestamp is T+100, while the intent timestamp
//    updated at Step 3 is T+200.
// 5) The put operation overrides the old value using timestamp T+100.
// 6) When the Writer attempts to commit its txn, the txn will be restarted
//    again at a new epoch timestamp T+200, which will finally succeed.
func TestTxnPutOutOfOrder(t *testing.T) {
	defer leaktest.AfterTest(t)()

	key := "key"
	// Set up a filter to so that the get operation at Step 3 will return an error.
	var numGets int32

	manualClock := hlc.NewManualClock(0)
	clock := hlc.NewClock(manualClock.UnixNano)
	stopper := stop.NewStopper()
	defer stopper.Stop()
	ctx := storage.TestStoreContext()
	ctx.TestingKnobs.TestingCommandFilter =
		func(filterArgs storagebase.FilterArgs) *roachpb.Error {
			if _, ok := filterArgs.Req.(*roachpb.GetRequest); ok &&
				filterArgs.Req.Header().Key.Equal(roachpb.Key(key)) &&
				filterArgs.Hdr.Txn == nil {
				// The Reader executes two get operations, each of which triggers two get requests
				// (the first request fails and triggers txn push, and then the second request
				// succeeds). Returns an error for the fourth get request to avoid timestamp cache
				// update after the third get operation pushes the txn timestamp.
				if atomic.AddInt32(&numGets, 1) == 4 {
					return roachpb.NewErrorWithTxn(errors.Errorf("Test"), filterArgs.Hdr.Txn)
				}
			}
			return nil
		}
	store := createTestStoreWithEngine(t,
		engine.NewInMem(roachpb.Attributes{}, 10<<20, stopper),
		clock,
		true,
		ctx,
		stopper)

	// Put an initial value.
	initVal := []byte("initVal")
	err := store.DB().Put(key, initVal)
	if err != nil {
		t.Fatalf("failed to put: %s", err)
	}

	waitPut := make(chan struct{})
	waitFirstGet := make(chan struct{})
	waitTxnRestart := make(chan struct{})
	waitSecondGet := make(chan struct{})
	waitTxnComplete := make(chan struct{})

	// Start the Writer.
	go func() {
		epoch := -1
		// Start a txn that does read-after-write.
		// The txn will be restarted twice, and the out-of-order put
		// will happen in the second epoch.
		if err := store.DB().Txn(func(txn *client.Txn) error {
			epoch++

			if epoch == 1 {
				// Wait until the second get operation is issued.
				close(waitTxnRestart)
				<-waitSecondGet
			}

			updatedVal := []byte("updatedVal")
			if err := txn.Put(key, updatedVal); err != nil {
				return err
			}

			// Make sure a get will return the value that was just written.
			actual, err := txn.Get(key)
			if err != nil {
				return err
			}
			if !bytes.Equal(actual.ValueBytes(), updatedVal) {
				t.Fatalf("unexpected get result: %s", actual)
			}

			if epoch == 0 {
				// Wait until the first get operation will push the txn timestamp.
				close(waitPut)
				<-waitFirstGet
			}

			b := txn.NewBatch()
			return txn.CommitInBatch(b)
		}); err != nil {
			t.Fatal(err)
		}

		if epoch != 2 {
			t.Fatalf("unexpected number of txn retries: %d", epoch)
		}

		close(waitTxnComplete)
	}()

	<-waitPut

	// Start the Reader.

	// Advance the clock and send a get operation with higher
	// priority to trigger the txn restart.
	manualClock.Increment(100)

	priority := roachpb.UserPriority(-math.MaxInt32)
	requestHeader := roachpb.Span{
		Key: roachpb.Key(key),
	}
	ts := clock.Now()
	if _, err := client.SendWrappedWith(rg1(store), nil, roachpb.Header{
		Timestamp:    ts,
		UserPriority: priority,
	}, &roachpb.GetRequest{Span: requestHeader}); err != nil {
		t.Fatalf("failed to get: %s", err)
	}

	// Wait until the writer restarts the txn.
	close(waitFirstGet)
	<-waitTxnRestart

	// Advance the clock and send a get operation again. This time
	// we use TestingCommandFilter so that a get operation is not
	// processed after the write intent is resolved (to prevent the
	// timestamp cache from being updated).
	manualClock.Increment(100)

	ts = clock.Now()
	if _, err := client.SendWrappedWith(rg1(store), nil, roachpb.Header{
		Timestamp:    ts,
		UserPriority: priority,
	}, &roachpb.GetRequest{Span: requestHeader}); err == nil {
		t.Fatal("unexpected success of get")
	}

	close(waitSecondGet)
	<-waitTxnComplete
}
示例#4
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// InternalSetPriority sets the transaction priority. It is intended for
// internal (testing) use only.
func (txn *Txn) InternalSetPriority(priority int32) {
	// The negative user priority is translated on the server into a positive,
	// non-randomized, priority for the transaction.
	txn.db.userPriority = roachpb.UserPriority(-priority)
}
示例#5
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func (m *Session_Transaction) Unmarshal(data []byte) error {
	l := len(data)
	iNdEx := 0
	for iNdEx < l {
		preIndex := iNdEx
		var wire uint64
		for shift := uint(0); ; shift += 7 {
			if shift >= 64 {
				return ErrIntOverflowSession
			}
			if iNdEx >= l {
				return io.ErrUnexpectedEOF
			}
			b := data[iNdEx]
			iNdEx++
			wire |= (uint64(b) & 0x7F) << shift
			if b < 0x80 {
				break
			}
		}
		fieldNum := int32(wire >> 3)
		wireType := int(wire & 0x7)
		if wireType == 4 {
			return fmt.Errorf("proto: Transaction: wiretype end group for non-group")
		}
		if fieldNum <= 0 {
			return fmt.Errorf("proto: Transaction: illegal tag %d (wire type %d)", fieldNum, wire)
		}
		switch fieldNum {
		case 1:
			if wireType != 2 {
				return fmt.Errorf("proto: wrong wireType = %d for field Txn", wireType)
			}
			var msglen int
			for shift := uint(0); ; shift += 7 {
				if shift >= 64 {
					return ErrIntOverflowSession
				}
				if iNdEx >= l {
					return io.ErrUnexpectedEOF
				}
				b := data[iNdEx]
				iNdEx++
				msglen |= (int(b) & 0x7F) << shift
				if b < 0x80 {
					break
				}
			}
			if msglen < 0 {
				return ErrInvalidLengthSession
			}
			postIndex := iNdEx + msglen
			if postIndex > l {
				return io.ErrUnexpectedEOF
			}
			if err := m.Txn.Unmarshal(data[iNdEx:postIndex]); err != nil {
				return err
			}
			iNdEx = postIndex
		case 2:
			if wireType != 2 {
				return fmt.Errorf("proto: wrong wireType = %d for field Timestamp", wireType)
			}
			var msglen int
			for shift := uint(0); ; shift += 7 {
				if shift >= 64 {
					return ErrIntOverflowSession
				}
				if iNdEx >= l {
					return io.ErrUnexpectedEOF
				}
				b := data[iNdEx]
				iNdEx++
				msglen |= (int(b) & 0x7F) << shift
				if b < 0x80 {
					break
				}
			}
			if msglen < 0 {
				return ErrInvalidLengthSession
			}
			postIndex := iNdEx + msglen
			if postIndex > l {
				return io.ErrUnexpectedEOF
			}
			if err := m.Timestamp.Unmarshal(data[iNdEx:postIndex]); err != nil {
				return err
			}
			iNdEx = postIndex
		case 3:
			if wireType != 1 {
				return fmt.Errorf("proto: wrong wireType = %d for field UserPriority", wireType)
			}
			var v uint64
			if (iNdEx + 8) > l {
				return io.ErrUnexpectedEOF
			}
			iNdEx += 8
			v = uint64(data[iNdEx-8])
			v |= uint64(data[iNdEx-7]) << 8
			v |= uint64(data[iNdEx-6]) << 16
			v |= uint64(data[iNdEx-5]) << 24
			v |= uint64(data[iNdEx-4]) << 32
			v |= uint64(data[iNdEx-3]) << 40
			v |= uint64(data[iNdEx-2]) << 48
			v |= uint64(data[iNdEx-1]) << 56
			m.UserPriority = github_com_cockroachdb_cockroach_roachpb.UserPriority(math.Float64frombits(v))
		default:
			iNdEx = preIndex
			skippy, err := skipSession(data[iNdEx:])
			if err != nil {
				return err
			}
			if skippy < 0 {
				return ErrInvalidLengthSession
			}
			if (iNdEx + skippy) > l {
				return io.ErrUnexpectedEOF
			}
			iNdEx += skippy
		}
	}

	if iNdEx > l {
		return io.ErrUnexpectedEOF
	}
	return nil
}