diff --git a/_vendor/src/github.com/pingcap/kvproto/pkg/coprocessor/coprocessor.pb.go b/_vendor/src/github.com/pingcap/kvproto/pkg/coprocessor/coprocessor.pb.go
index dfcb573064792..b4c925788cd38 100644
--- a/_vendor/src/github.com/pingcap/kvproto/pkg/coprocessor/coprocessor.pb.go
+++ b/_vendor/src/github.com/pingcap/kvproto/pkg/coprocessor/coprocessor.pb.go
@@ -954,25 +954,25 @@ var (
 func init() { proto.RegisterFile("coprocessor.proto", fileDescriptorCoprocessor) }
 
 var fileDescriptorCoprocessor = []byte{
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 }
diff --git a/_vendor/src/github.com/pingcap/kvproto/pkg/eraftpb/eraftpb.pb.go b/_vendor/src/github.com/pingcap/kvproto/pkg/eraftpb/eraftpb.pb.go
index 9beb65836b673..523fe65d04be0 100644
--- a/_vendor/src/github.com/pingcap/kvproto/pkg/eraftpb/eraftpb.pb.go
+++ b/_vendor/src/github.com/pingcap/kvproto/pkg/eraftpb/eraftpb.pb.go
@@ -2165,53 +2165,52 @@ var (
 func init() { proto.RegisterFile("eraftpb.proto", fileDescriptorEraftpb) }
 
 var fileDescriptorEraftpb = []byte{
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 }
diff --git a/_vendor/src/github.com/pingcap/kvproto/pkg/errorpb/errorpb.pb.go b/_vendor/src/github.com/pingcap/kvproto/pkg/errorpb/errorpb.pb.go
index cf443dd8bb012..3a81dc323f335 100644
--- a/_vendor/src/github.com/pingcap/kvproto/pkg/errorpb/errorpb.pb.go
+++ b/_vendor/src/github.com/pingcap/kvproto/pkg/errorpb/errorpb.pb.go
@@ -1572,33 +1572,33 @@ var (
 func init() { proto.RegisterFile("errorpb.proto", fileDescriptorErrorpb) }
 
 var fileDescriptorErrorpb = []byte{
-	// 448 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x7c, 0x91, 0x4f, 0x6e, 0xd3, 0x40,
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-	0x3b, 0x78, 0xf2, 0x2f, 0x00, 0x00, 0xff, 0xff, 0x2b, 0x5c, 0x70, 0xcc, 0x30, 0x03, 0x00, 0x00,
+	// 440 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x7c, 0x91, 0xdf, 0x6a, 0xd4, 0x40,
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+	0xa5, 0x4b, 0x2b, 0x87, 0xe7, 0xc7, 0xbd, 0x70, 0x0c, 0x9f, 0xc7, 0x6a, 0x7c, 0x8c, 0x05, 0xdc,
+	0x37, 0x34, 0x48, 0x5f, 0x89, 0x76, 0x63, 0x62, 0x33, 0xf4, 0x18, 0x5f, 0x84, 0xc7, 0xb7, 0xe3,
+	0x0b, 0xbd, 0x84, 0x50, 0xdb, 0x6d, 0x33, 0xb4, 0xf4, 0x92, 0x03, 0x52, 0x3f, 0xe8, 0xd5, 0x5b,
+	0xb0, 0x1c, 0xf4, 0x16, 0xf2, 0x6b, 0x88, 0x35, 0x31, 0xcb, 0x2a, 0x9d, 0x5d, 0x1b, 0x6a, 0xc9,
+	0x94, 0x84, 0x8f, 0xb6, 0xc2, 0x01, 0x52, 0x1e, 0xe9, 0x41, 0xc6, 0x5e, 0xc1, 0x91, 0xfb, 0xe5,
+	0x8d, 0x23, 0x9c, 0xf8, 0xbb, 0xda, 0x01, 0x7e, 0xa3, 0x1d, 0x64, 0x8b, 0xd9, 0xcf, 0x3f, 0xa7,
+	0x93, 0x5f, 0xe6, 0xfb, 0x6d, 0xbe, 0x1f, 0x7f, 0x4f, 0xef, 0xfd, 0x0b, 0x00, 0x00, 0xff, 0xff,
+	0x2b, 0x5c, 0x70, 0xcc, 0x30, 0x03, 0x00, 0x00,
 }
diff --git a/_vendor/src/github.com/pingcap/kvproto/pkg/kvrpcpb/kvrpcpb.pb.go b/_vendor/src/github.com/pingcap/kvproto/pkg/kvrpcpb/kvrpcpb.pb.go
index 2d57bf5edc1ca..18527c993551b 100644
--- a/_vendor/src/github.com/pingcap/kvproto/pkg/kvrpcpb/kvrpcpb.pb.go
+++ b/_vendor/src/github.com/pingcap/kvproto/pkg/kvrpcpb/kvrpcpb.pb.go
@@ -475,10 +475,11 @@ func (m *Mutation) GetValue() []byte {
 type CmdPrewriteRequest struct {
 	Mutations []*Mutation `protobuf:"bytes,1,rep,name=mutations" json:"mutations,omitempty"`
 	// primary_lock_key
-	PrimaryLock      []byte `protobuf:"bytes,2,opt,name=primary_lock,json=primaryLock" json:"primary_lock,omitempty"`
-	StartVersion     uint64 `protobuf:"varint,3,opt,name=start_version,json=startVersion" json:"start_version"`
-	LockTtl          uint64 `protobuf:"varint,4,opt,name=lock_ttl,json=lockTtl" json:"lock_ttl"`
-	XXX_unrecognized []byte `json:"-"`
+	PrimaryLock         []byte `protobuf:"bytes,2,opt,name=primary_lock,json=primaryLock" json:"primary_lock,omitempty"`
+	StartVersion        uint64 `protobuf:"varint,3,opt,name=start_version,json=startVersion" json:"start_version"`
+	LockTtl             uint64 `protobuf:"varint,4,opt,name=lock_ttl,json=lockTtl" json:"lock_ttl"`
+	SkipConstraintCheck bool   `protobuf:"varint,5,opt,name=skip_constraint_check,json=skipConstraintCheck" json:"skip_constraint_check"`
+	XXX_unrecognized    []byte `json:"-"`
 }
 
 func (m *CmdPrewriteRequest) Reset()                    { *m = CmdPrewriteRequest{} }
@@ -514,6 +515,13 @@ func (m *CmdPrewriteRequest) GetLockTtl() uint64 {
 	return 0
 }
 
+func (m *CmdPrewriteRequest) GetSkipConstraintCheck() bool {
+	if m != nil {
+		return m.SkipConstraintCheck
+	}
+	return false
+}
+
 type CmdPrewriteResponse struct {
 	Errors           []*KeyError `protobuf:"bytes,1,rep,name=errors" json:"errors,omitempty"`
 	XXX_unrecognized []byte      `json:"-"`
@@ -1647,6 +1655,14 @@ func (m *CmdPrewriteRequest) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x20
 	i++
 	i = encodeVarintKvrpcpb(dAtA, i, uint64(m.LockTtl))
+	dAtA[i] = 0x28
+	i++
+	if m.SkipConstraintCheck {
+		dAtA[i] = 1
+	} else {
+		dAtA[i] = 0
+	}
+	i++
 	if m.XXX_unrecognized != nil {
 		i += copy(dAtA[i:], m.XXX_unrecognized)
 	}
@@ -2843,6 +2859,7 @@ func (m *CmdPrewriteRequest) Size() (n int) {
 	}
 	n += 1 + sovKvrpcpb(uint64(m.StartVersion))
 	n += 1 + sovKvrpcpb(uint64(m.LockTtl))
+	n += 2
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -4606,6 +4623,26 @@ func (m *CmdPrewriteRequest) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
+		case 5:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SkipConstraintCheck", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowKvrpcpb
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.SkipConstraintCheck = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skipKvrpcpb(dAtA[iNdEx:])
@@ -7746,108 +7783,108 @@ var (
 func init() { proto.RegisterFile("kvrpcpb.proto", fileDescriptorKvrpcpb) }
 
 var fileDescriptorKvrpcpb = []byte{
-	// 1641 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xac, 0x58, 0xdf, 0x72, 0xd3, 0xce,
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-	0x67, 0x77, 0xa5, 0x55, 0xa4, 0xa4, 0x78, 0xe6, 0x77, 0x67, 0x7d, 0xbb, 0xfb, 0xed, 0x77, 0xf6,
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 }
diff --git a/_vendor/src/github.com/pingcap/kvproto/pkg/metapb/metapb.pb.go b/_vendor/src/github.com/pingcap/kvproto/pkg/metapb/metapb.pb.go
index cf445266590bc..614152f406a8e 100644
--- a/_vendor/src/github.com/pingcap/kvproto/pkg/metapb/metapb.pb.go
+++ b/_vendor/src/github.com/pingcap/kvproto/pkg/metapb/metapb.pb.go
@@ -1452,33 +1452,32 @@ var (
 func init() { proto.RegisterFile("metapb.proto", fileDescriptorMetapb) }
 
 var fileDescriptorMetapb = []byte{
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 }
diff --git a/_vendor/src/github.com/pingcap/kvproto/pkg/msgpb/msgpb.pb.go b/_vendor/src/github.com/pingcap/kvproto/pkg/msgpb/msgpb.pb.go
index 3c7817d0ae70b..46e332e409eb6 100644
--- a/_vendor/src/github.com/pingcap/kvproto/pkg/msgpb/msgpb.pb.go
+++ b/_vendor/src/github.com/pingcap/kvproto/pkg/msgpb/msgpb.pb.go
@@ -869,33 +869,32 @@ var (
 func init() { proto.RegisterFile("msgpb.proto", fileDescriptorMsgpb) }
 
 var fileDescriptorMsgpb = []byte{
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 }
diff --git a/_vendor/src/github.com/pingcap/kvproto/pkg/pdpb/pdpb.pb.go b/_vendor/src/github.com/pingcap/kvproto/pkg/pdpb/pdpb.pb.go
index e6bf888062686..1f7cd3eece16a 100644
--- a/_vendor/src/github.com/pingcap/kvproto/pkg/pdpb/pdpb.pb.go
+++ b/_vendor/src/github.com/pingcap/kvproto/pkg/pdpb/pdpb.pb.go
@@ -8692,122 +8692,122 @@ var (
 func init() { proto.RegisterFile("pdpb.proto", fileDescriptorPdpb) }
 
 var fileDescriptorPdpb = []byte{
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 }
diff --git a/_vendor/src/github.com/pingcap/kvproto/pkg/raft_cmdpb/raft_cmdpb.pb.go b/_vendor/src/github.com/pingcap/kvproto/pkg/raft_cmdpb/raft_cmdpb.pb.go
index 2e73c87f7dc75..19027b01475b3 100644
--- a/_vendor/src/github.com/pingcap/kvproto/pkg/raft_cmdpb/raft_cmdpb.pb.go
+++ b/_vendor/src/github.com/pingcap/kvproto/pkg/raft_cmdpb/raft_cmdpb.pb.go
@@ -6733,90 +6733,90 @@ var (
 func init() { proto.RegisterFile("raft_cmdpb.proto", fileDescriptorRaftCmdpb) }
 
 var fileDescriptorRaftCmdpb = []byte{
-	// 1359 bytes of a gzipped FileDescriptorProto
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diff --git a/_vendor/src/github.com/pingcap/kvproto/pkg/raft_serverpb/raft_serverpb.pb.go b/_vendor/src/github.com/pingcap/kvproto/pkg/raft_serverpb/raft_serverpb.pb.go
index a462fbfb68bcb..c94f0805b5222 100644
--- a/_vendor/src/github.com/pingcap/kvproto/pkg/raft_serverpb/raft_serverpb.pb.go
+++ b/_vendor/src/github.com/pingcap/kvproto/pkg/raft_serverpb/raft_serverpb.pb.go
@@ -2020,44 +2020,43 @@ var (
 func init() { proto.RegisterFile("raft_serverpb.proto", fileDescriptorRaftServerpb) }
 
 var fileDescriptorRaftServerpb = []byte{
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+	0x75, 0x9c, 0x73, 0x2d, 0x19, 0x17, 0x1f, 0x5b, 0x10, 0x7d, 0x71, 0x20, 0xd0, 0x49, 0xc7, 0x05,
+	0x29, 0xc5, 0x82, 0xc9, 0x27, 0x44, 0x12, 0x74, 0x0b, 0xda, 0xb6, 0x61, 0xe3, 0xdf, 0x1d, 0xf6,
+	0x77, 0x67, 0x82, 0x2b, 0x55, 0xb7, 0x39, 0x4b, 0x33, 0x1a, 0x8b, 0xf4, 0x13, 0xad, 0x2a, 0x71,
+	0x35, 0x31, 0x56, 0x18, 0xdd, 0x85, 0x66, 0xa2, 0x82, 0xa9, 0x75, 0xed, 0xab, 0x10, 0x87, 0x83,
+	0xdd, 0xcb, 0xaa, 0x0b, 0xc5, 0xc6, 0x28, 0x7a, 0x06, 0x30, 0x96, 0x8c, 0xd3, 0x51, 0x42, 0x0b,
+	0x89, 0xae, 0x01, 0x4c, 0xb3, 0xa5, 0x50, 0x4d, 0x6d, 0xae, 0xc6, 0xab, 0x18, 0x75, 0x36, 0x57,
+	0x40, 0x0d, 0x53, 0x19, 0x6b, 0xd1, 0x66, 0xed, 0x08, 0xeb, 0x1c, 0x4d, 0xa0, 0xaf, 0xbb, 0x79,
+	0xc5, 0xa6, 0x24, 0xb3, 0xe3, 0xbb, 0x07, 0xb0, 0x20, 0x3c, 0x89, 0x85, 0x46, 0x55, 0x3f, 0x68,
+	0x7d, 0x14, 0xcf, 0x95, 0x64, 0xec, 0xb0, 0xb7, 0xa8, 0x9f, 0x3a, 0x7d, 0x46, 0x84, 0x8c, 0xed,
+	0xd8, 0x6d, 0x06, 0x4f, 0x33, 0x23, 0x4d, 0x44, 0x9f, 0x1d, 0x9b, 0xe4, 0x51, 0x59, 0x66, 0x2b,
+	0xeb, 0x71, 0x03, 0x7a, 0x44, 0xa1, 0x94, 0x26, 0xf1, 0xf6, 0xae, 0xfc, 0x8a, 0x34, 0x7e, 0xe8,
+	0x05, 0x5c, 0x92, 0xf5, 0x6a, 0xab, 0x72, 0xec, 0xcd, 0x9f, 0x5c, 0x98, 0xcd, 0xdf, 0x47, 0x80,
+	0xfb, 0x72, 0x07, 0x47, 0xef, 0xd5, 0xd6, 0xcc, 0x0e, 0xb6, 0x3a, 0x1d, 0x40, 0x6b, 0xd3, 0x64,
+	0x7f, 0x18, 0x5e, 0x88, 0xaa, 0xbf, 0x0f, 0x1b, 0xcc, 0x9a, 0x6d, 0x6d, 0xb9, 0xf1, 0xbf, 0x2d,
+	0x9f, 0xde, 0x07, 0x6f, 0xed, 0x8b, 0x00, 0xda, 0x6f, 0x18, 0xcf, 0x49, 0x16, 0xec, 0x21, 0x1f,
+	0x5c, 0x33, 0x83, 0xb4, 0x98, 0x07, 0x0e, 0xea, 0x81, 0xb7, 0xfe, 0x00, 0x82, 0xc6, 0xe3, 0xe0,
+	0xfb, 0xaf, 0x63, 0xe7, 0x87, 0xfa, 0xfd, 0x54, 0xbf, 0xaf, 0xbf, 0x8f, 0xf7, 0xfe, 0x04, 0x00,
+	0x00, 0xff, 0xff, 0xd8, 0xfb, 0xf7, 0xdf, 0x5c, 0x04, 0x00, 0x00,
 }
diff --git a/glide.lock b/glide.lock
index f7a91e47166de..9a0d3507de502 100644
--- a/glide.lock
+++ b/glide.lock
@@ -1,5 +1,5 @@
-hash: b0c192c56de1b76fad1c1aebaeb156490d4bc6ad9274354f4b7f683742f9221f
-updated: 2016-12-12T20:34:04.098737462+08:00
+hash: be41defff914da1590e40b679f2a5f662a932814e1370e175d78703c8fd62e5b
+updated: 2016-12-21T15:06:47.700116062+08:00
 imports:
 - name: bitbucket.org/ww/goautoneg
   version: 75cd24fc2f2c2a2088577d12123ddee5f54e0675
@@ -99,7 +99,7 @@ imports:
   - leveldb/table
   - leveldb/util
 - name: github.com/pingcap/kvproto
-  version: 679b4719adb44bb55780ad2480f29a0f234b039e
+  version: d9952e26f4ac9b0f61e8ef687cfbb50fe2067e44
   subpackages:
   - pkg/coprocessor
   - pkg/eraftpb
diff --git a/glide.yaml b/glide.yaml
index 106b128b9f84f..be7b3faac1cf9 100644
--- a/glide.yaml
+++ b/glide.yaml
@@ -147,7 +147,7 @@ import:
   - go-binlog
   - go-tipb
 - package: github.com/pingcap/kvproto
-  version: 679b4719adb44bb55780ad2480f29a0f234b039e
+  version: d9952e26f4ac9b0f61e8ef687cfbb50fe2067e44
 - package: github.com/gogo/protobuf
   version: ^0.3.0
   subpackages:
diff --git a/kv/kv.go b/kv/kv.go
index 8b6f0b3d9318c..09abe27b8c6ef 100644
--- a/kv/kv.go
+++ b/kv/kv.go
@@ -29,6 +29,8 @@ const (
 	PresumeKeyNotExistsError
 	// BinlogData is the binlog data to write.
 	BinlogData
+	// Skip existing check when "prewrite".
+	SkipCheckForWrite
 )
 
 // Retriever is the interface wraps the basic Get and Seek methods.
diff --git a/store/tikv/2pc.go b/store/tikv/2pc.go
index 57cde6db56568..537e056dfdfee 100644
--- a/store/tikv/2pc.go
+++ b/store/tikv/2pc.go
@@ -250,13 +250,20 @@ func (c *twoPhaseCommitter) prewriteSingleBatch(bo *Backoffer, batch batchKeys)
 	for i, k := range batch.keys {
 		mutations[i] = c.mutations[string(k)]
 	}
+
+	skipCheck := false
+	optSkipCheck := c.txn.us.GetOption(kv.SkipCheckForWrite)
+	if skip, ok := optSkipCheck.(bool); ok && skip {
+		skipCheck = true
+	}
 	req := &pb.Request{
 		Type: pb.MessageType_CmdPrewrite,
 		CmdPrewriteReq: &pb.CmdPrewriteRequest{
-			Mutations:    mutations,
-			PrimaryLock:  c.primary(),
-			StartVersion: c.startTS,
-			LockTtl:      c.lockTTL,
+			Mutations:           mutations,
+			PrimaryLock:         c.primary(),
+			StartVersion:        c.startTS,
+			LockTtl:             c.lockTTL,
+			SkipConstraintCheck: skipCheck,
 		},
 	}
 
diff --git a/table/tables/tables.go b/table/tables/tables.go
index 52fac2ff3f300..c02f20c85c059 100644
--- a/table/tables/tables.go
+++ b/table/tables/tables.go
@@ -319,6 +319,12 @@ func (t *Table) AddRecord(ctx context.Context, r []types.Datum) (recordID int64,
 	if err != nil {
 		return 0, errors.Trace(err)
 	}
+
+	skipCheck := ctx.GetSessionVars().SkipConstraintCheck
+	if skipCheck {
+		txn.SetOption(kv.SkipCheckForWrite, true)
+	}
+
 	bs := kv.NewBufferStore(txn)
 	// Insert new entries into indices.
 	h, err := t.addIndices(ctx, recordID, r, bs)