diff --git a/cluster/internal/data.pb.go b/cluster/internal/data.pb.go
index 667cea9fb1..54c44951cd 100644
--- a/cluster/internal/data.pb.go
+++ b/cluster/internal/data.pb.go
@@ -19,23 +19,23 @@ It has these top-level messages:
 	FieldDimensionsResponse
 	SeriesKeysRequest
 	SeriesKeysResponse
+	ExpandSourcesRequest
+	ExpandSourcesResponse
 */
 package internal
 
 import proto "github.com/gogo/protobuf/proto"
-import fmt "fmt"
 import math "math"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
-var _ = fmt.Errorf
 var _ = math.Inf
 
 type WriteShardRequest struct {
-	ShardID          *uint64  `protobuf:"varint,1,req,name=ShardID" json:"ShardID,omitempty"`
-	Points           [][]byte `protobuf:"bytes,2,rep,name=Points" json:"Points,omitempty"`
-	Database         *string  `protobuf:"bytes,3,opt,name=Database" json:"Database,omitempty"`
-	RetentionPolicy  *string  `protobuf:"bytes,4,opt,name=RetentionPolicy" json:"RetentionPolicy,omitempty"`
+	ShardID          *uint64  `protobuf:"varint,1,req" json:"ShardID,omitempty"`
+	Points           [][]byte `protobuf:"bytes,2,rep" json:"Points,omitempty"`
+	Database         *string  `protobuf:"bytes,3,opt" json:"Database,omitempty"`
+	RetentionPolicy  *string  `protobuf:"bytes,4,opt" json:"RetentionPolicy,omitempty"`
 	XXX_unrecognized []byte   `json:"-"`
 }
 
@@ -72,8 +72,8 @@ func (m *WriteShardRequest) GetRetentionPolicy() string {
 }
 
 type WriteShardResponse struct {
-	Code             *int32  `protobuf:"varint,1,req,name=Code" json:"Code,omitempty"`
-	Message          *string `protobuf:"bytes,2,opt,name=Message" json:"Message,omitempty"`
+	Code             *int32  `protobuf:"varint,1,req" json:"Code,omitempty"`
+	Message          *string `protobuf:"bytes,2,opt" json:"Message,omitempty"`
 	XXX_unrecognized []byte  `json:"-"`
 }
 
@@ -96,8 +96,8 @@ func (m *WriteShardResponse) GetMessage() string {
 }
 
 type ExecuteStatementRequest struct {
-	Statement        *string `protobuf:"bytes,1,req,name=Statement" json:"Statement,omitempty"`
-	Database         *string `protobuf:"bytes,2,req,name=Database" json:"Database,omitempty"`
+	Statement        *string `protobuf:"bytes,1,req" json:"Statement,omitempty"`
+	Database         *string `protobuf:"bytes,2,req" json:"Database,omitempty"`
 	XXX_unrecognized []byte  `json:"-"`
 }
 
@@ -120,8 +120,8 @@ func (m *ExecuteStatementRequest) GetDatabase() string {
 }
 
 type ExecuteStatementResponse struct {
-	Code             *int32  `protobuf:"varint,1,req,name=Code" json:"Code,omitempty"`
-	Message          *string `protobuf:"bytes,2,opt,name=Message" json:"Message,omitempty"`
+	Code             *int32  `protobuf:"varint,1,req" json:"Code,omitempty"`
+	Message          *string `protobuf:"bytes,2,opt" json:"Message,omitempty"`
 	XXX_unrecognized []byte  `json:"-"`
 }
 
@@ -144,8 +144,8 @@ func (m *ExecuteStatementResponse) GetMessage() string {
 }
 
 type CreateIteratorRequest struct {
-	ShardIDs         []uint64 `protobuf:"varint,1,rep,name=ShardIDs" json:"ShardIDs,omitempty"`
-	Opt              []byte   `protobuf:"bytes,2,req,name=Opt" json:"Opt,omitempty"`
+	ShardIDs         []uint64 `protobuf:"varint,1,rep" json:"ShardIDs,omitempty"`
+	Opt              []byte   `protobuf:"bytes,2,req" json:"Opt,omitempty"`
 	XXX_unrecognized []byte   `json:"-"`
 }
 
@@ -168,7 +168,7 @@ func (m *CreateIteratorRequest) GetOpt() []byte {
 }
 
 type CreateIteratorResponse struct {
-	Err              *string `protobuf:"bytes,1,opt,name=Err" json:"Err,omitempty"`
+	Err              *string `protobuf:"bytes,1,opt" json:"Err,omitempty"`
 	XXX_unrecognized []byte  `json:"-"`
 }
 
@@ -184,8 +184,8 @@ func (m *CreateIteratorResponse) GetErr() string {
 }
 
 type FieldDimensionsRequest struct {
-	ShardIDs         []uint64 `protobuf:"varint,1,rep,name=ShardIDs" json:"ShardIDs,omitempty"`
-	Sources          []byte   `protobuf:"bytes,2,req,name=Sources" json:"Sources,omitempty"`
+	ShardIDs         []uint64 `protobuf:"varint,1,rep" json:"ShardIDs,omitempty"`
+	Sources          []byte   `protobuf:"bytes,2,req" json:"Sources,omitempty"`
 	XXX_unrecognized []byte   `json:"-"`
 }
 
@@ -208,9 +208,9 @@ func (m *FieldDimensionsRequest) GetSources() []byte {
 }
 
 type FieldDimensionsResponse struct {
-	Fields           []string `protobuf:"bytes,1,rep,name=Fields" json:"Fields,omitempty"`
-	Dimensions       []string `protobuf:"bytes,2,rep,name=Dimensions" json:"Dimensions,omitempty"`
-	Err              *string  `protobuf:"bytes,3,opt,name=Err" json:"Err,omitempty"`
+	Fields           []string `protobuf:"bytes,1,rep" json:"Fields,omitempty"`
+	Dimensions       []string `protobuf:"bytes,2,rep" json:"Dimensions,omitempty"`
+	Err              *string  `protobuf:"bytes,3,opt" json:"Err,omitempty"`
 	XXX_unrecognized []byte   `json:"-"`
 }
 
@@ -240,8 +240,8 @@ func (m *FieldDimensionsResponse) GetErr() string {
 }
 
 type SeriesKeysRequest struct {
-	ShardIDs         []uint64 `protobuf:"varint,1,rep,name=ShardIDs" json:"ShardIDs,omitempty"`
-	Opt              []byte   `protobuf:"bytes,2,req,name=Opt" json:"Opt,omitempty"`
+	ShardIDs         []uint64 `protobuf:"varint,1,rep" json:"ShardIDs,omitempty"`
+	Opt              []byte   `protobuf:"bytes,2,req" json:"Opt,omitempty"`
 	XXX_unrecognized []byte   `json:"-"`
 }
 
@@ -264,8 +264,8 @@ func (m *SeriesKeysRequest) GetOpt() []byte {
 }
 
 type SeriesKeysResponse struct {
-	SeriesList       []byte  `protobuf:"bytes,1,opt,name=SeriesList" json:"SeriesList,omitempty"`
-	Err              *string `protobuf:"bytes,2,opt,name=Err" json:"Err,omitempty"`
+	SeriesList       []byte  `protobuf:"bytes,1,opt" json:"SeriesList,omitempty"`
+	Err              *string `protobuf:"bytes,2,opt" json:"Err,omitempty"`
 	XXX_unrecognized []byte  `json:"-"`
 }
 
@@ -287,15 +287,53 @@ func (m *SeriesKeysResponse) GetErr() string {
 	return ""
 }
 
-func init() {
-	proto.RegisterType((*WriteShardRequest)(nil), "internal.WriteShardRequest")
-	proto.RegisterType((*WriteShardResponse)(nil), "internal.WriteShardResponse")
-	proto.RegisterType((*ExecuteStatementRequest)(nil), "internal.ExecuteStatementRequest")
-	proto.RegisterType((*ExecuteStatementResponse)(nil), "internal.ExecuteStatementResponse")
-	proto.RegisterType((*CreateIteratorRequest)(nil), "internal.CreateIteratorRequest")
-	proto.RegisterType((*CreateIteratorResponse)(nil), "internal.CreateIteratorResponse")
-	proto.RegisterType((*FieldDimensionsRequest)(nil), "internal.FieldDimensionsRequest")
-	proto.RegisterType((*FieldDimensionsResponse)(nil), "internal.FieldDimensionsResponse")
-	proto.RegisterType((*SeriesKeysRequest)(nil), "internal.SeriesKeysRequest")
-	proto.RegisterType((*SeriesKeysResponse)(nil), "internal.SeriesKeysResponse")
+type ExpandSourcesRequest struct {
+	ShardIDs         []uint64 `protobuf:"varint,1,rep" json:"ShardIDs,omitempty"`
+	Sources          []byte   `protobuf:"bytes,2,req" json:"Sources,omitempty"`
+	XXX_unrecognized []byte   `json:"-"`
+}
+
+func (m *ExpandSourcesRequest) Reset()         { *m = ExpandSourcesRequest{} }
+func (m *ExpandSourcesRequest) String() string { return proto.CompactTextString(m) }
+func (*ExpandSourcesRequest) ProtoMessage()    {}
+
+func (m *ExpandSourcesRequest) GetShardIDs() []uint64 {
+	if m != nil {
+		return m.ShardIDs
+	}
+	return nil
+}
+
+func (m *ExpandSourcesRequest) GetSources() []byte {
+	if m != nil {
+		return m.Sources
+	}
+	return nil
+}
+
+type ExpandSourcesResponse struct {
+	Sources          []byte  `protobuf:"bytes,1,req" json:"Sources,omitempty"`
+	Err              *string `protobuf:"bytes,2,opt" json:"Err,omitempty"`
+	XXX_unrecognized []byte  `json:"-"`
+}
+
+func (m *ExpandSourcesResponse) Reset()         { *m = ExpandSourcesResponse{} }
+func (m *ExpandSourcesResponse) String() string { return proto.CompactTextString(m) }
+func (*ExpandSourcesResponse) ProtoMessage()    {}
+
+func (m *ExpandSourcesResponse) GetSources() []byte {
+	if m != nil {
+		return m.Sources
+	}
+	return nil
+}
+
+func (m *ExpandSourcesResponse) GetErr() string {
+	if m != nil && m.Err != nil {
+		return *m.Err
+	}
+	return ""
+}
+
+func init() {
 }
diff --git a/cluster/internal/data.proto b/cluster/internal/data.proto
index 97e686e306..a1579035e0 100644
--- a/cluster/internal/data.proto
+++ b/cluster/internal/data.proto
@@ -52,3 +52,12 @@ message SeriesKeysResponse {
     optional string Err        = 2;
 }
 
+message ExpandSourcesRequest {
+    repeated uint64 ShardIDs = 1;
+    required bytes  Sources  = 2;
+}
+
+message ExpandSourcesResponse {
+    required bytes  Sources  = 1;
+    optional string Err      = 2;
+}
diff --git a/cluster/query_executor.go b/cluster/query_executor.go
index 937b41594c..e8e83928a1 100644
--- a/cluster/query_executor.go
+++ b/cluster/query_executor.go
@@ -415,13 +415,6 @@ func (e *QueryExecutor) executeSelectStatement(stmt *influxql.SelectStatement, c
 		opt.MinTime = time.Unix(0, 0)
 	}
 
-	// Expand regex sources to their actual source names.
-	sources, err := e.TSDBStore.ExpandSources(stmt.Sources)
-	if err != nil {
-		return err
-	}
-	stmt.Sources = sources
-
 	// Convert DISTINCT into a call.
 	stmt.RewriteDistinct()
 
@@ -434,6 +427,15 @@ func (e *QueryExecutor) executeSelectStatement(stmt *influxql.SelectStatement, c
 		return err
 	}
 
+	// Expand regex sources to their actual source names.
+	if stmt.Sources.HasRegex() {
+		sources, err := ic.ExpandSources(stmt.Sources)
+		if err != nil {
+			return err
+		}
+		stmt.Sources = sources
+	}
+
 	// Rewrite wildcards, if any exist.
 	tmp, err := stmt.RewriteWildcards(ic)
 	if err != nil {
@@ -1056,6 +1058,30 @@ func (ic *remoteIteratorCreator) SeriesKeys(opt influxql.IteratorOptions) (influ
 	return resp.SeriesList, resp.Err
 }
 
+// ExpandSources expands regex sources on a remote iterator creator.
+func (ic *remoteIteratorCreator) ExpandSources(sources influxql.Sources) (influxql.Sources, error) {
+	conn, err := ic.dialer.DialNode(ic.nodeID)
+	if err != nil {
+		return nil, err
+	}
+	defer conn.Close()
+
+	// Write request.
+	if err := EncodeTLV(conn, expandSourcesRequestMessage, &ExpandSourcesRequest{
+		ShardIDs: ic.shardIDs,
+		Sources:  sources,
+	}); err != nil {
+		return nil, err
+	}
+
+	// Read the response.
+	var resp ExpandSourcesResponse
+	if _, err := DecodeTLV(conn, &resp); err != nil {
+		return nil, err
+	}
+	return resp.Sources, resp.Err
+}
+
 // NodeDialer dials connections to a given node.
 type NodeDialer struct {
 	MetaClient MetaClient
diff --git a/cluster/query_executor_test.go b/cluster/query_executor_test.go
index f14a810c18..6a171cad10 100644
--- a/cluster/query_executor_test.go
+++ b/cluster/query_executor_test.go
@@ -275,6 +275,7 @@ type IteratorCreator struct {
 	CreateIteratorFn  func(opt influxql.IteratorOptions) (influxql.Iterator, error)
 	FieldDimensionsFn func(sources influxql.Sources) (fields, dimensions map[string]struct{}, err error)
 	SeriesKeysFn      func(opt influxql.IteratorOptions) (influxql.SeriesList, error)
+	ExpandSourcesFn   func(sources influxql.Sources) (influxql.Sources, error)
 }
 
 func (ic *IteratorCreator) CreateIterator(opt influxql.IteratorOptions) (influxql.Iterator, error) {
@@ -289,6 +290,10 @@ func (ic *IteratorCreator) SeriesKeys(opt influxql.IteratorOptions) (influxql.Se
 	return ic.SeriesKeysFn(opt)
 }
 
+func (ic *IteratorCreator) ExpandSources(sources influxql.Sources) (influxql.Sources, error) {
+	return ic.ExpandSourcesFn(sources)
+}
+
 // FloatIterator is a represents an iterator that reads from a slice.
 type FloatIterator struct {
 	Points []influxql.FloatPoint
diff --git a/cluster/rpc.go b/cluster/rpc.go
index 8710e89980..814615af3c 100644
--- a/cluster/rpc.go
+++ b/cluster/rpc.go
@@ -411,3 +411,72 @@ func (r *SeriesKeysResponse) UnmarshalBinary(data []byte) error {
 
 	return nil
 }
+
+// ExpandSourcesRequest represents a request to expand regex sources.
+type ExpandSourcesRequest struct {
+	ShardIDs []uint64
+	Sources  influxql.Sources
+}
+
+// MarshalBinary encodes r to a binary format.
+func (r *ExpandSourcesRequest) MarshalBinary() ([]byte, error) {
+	buf, err := r.Sources.MarshalBinary()
+	if err != nil {
+		return nil, err
+	}
+	return proto.Marshal(&internal.ExpandSourcesRequest{
+		ShardIDs: r.ShardIDs,
+		Sources:  buf,
+	})
+}
+
+// UnmarshalBinary decodes data into r.
+func (r *ExpandSourcesRequest) UnmarshalBinary(data []byte) error {
+	var pb internal.ExpandSourcesRequest
+	if err := proto.Unmarshal(data, &pb); err != nil {
+		return err
+	}
+
+	r.ShardIDs = pb.GetShardIDs()
+	if err := r.Sources.UnmarshalBinary(pb.GetSources()); err != nil {
+		return err
+	}
+	return nil
+}
+
+// ExpandSourcesResponse represents a response from source expansion.
+type ExpandSourcesResponse struct {
+	Sources influxql.Sources
+	Err     error
+}
+
+// MarshalBinary encodes r to a binary format.
+func (r *ExpandSourcesResponse) MarshalBinary() ([]byte, error) {
+	var pb internal.ExpandSourcesResponse
+	buf, err := r.Sources.MarshalBinary()
+	if err != nil {
+		return nil, err
+	}
+	pb.Sources = buf
+
+	if r.Err != nil {
+		pb.Err = proto.String(r.Err.Error())
+	}
+	return proto.Marshal(&pb)
+}
+
+// UnmarshalBinary decodes data into r.
+func (r *ExpandSourcesResponse) UnmarshalBinary(data []byte) error {
+	var pb internal.ExpandSourcesResponse
+	if err := proto.Unmarshal(data, &pb); err != nil {
+		return err
+	}
+	if err := r.Sources.UnmarshalBinary(pb.GetSources()); err != nil {
+		return err
+	}
+
+	if pb.Err != nil {
+		r.Err = errors.New(pb.GetErr())
+	}
+	return nil
+}
diff --git a/cluster/service.go b/cluster/service.go
index a24d569a1f..cedc5a76f1 100644
--- a/cluster/service.go
+++ b/cluster/service.go
@@ -38,6 +38,9 @@ const (
 
 	seriesKeysReq  = "seriesKeysReq"
 	seriesKeysResp = "seriesKeysResp"
+
+	expandSourcesReq  = "expandSourcesReq"
+	expandSourcesResp = "expandSourcesResp"
 )
 
 // Service processes data received over raw TCP connections.
@@ -196,6 +199,10 @@ func (s *Service) handleConn(conn net.Conn) {
 			s.statMap.Add(seriesKeysReq, 1)
 			s.processSeriesKeysRequest(conn)
 			return
+		case expandSourcesRequestMessage:
+			s.statMap.Add(expandSourcesReq, 1)
+			s.processExpandSourcesRequest(conn)
+			return
 		default:
 			s.Logger.Printf("cluster service message type not found: %d", typ)
 		}
@@ -439,6 +446,48 @@ func (s *Service) processSeriesKeysRequest(conn net.Conn) {
 	}
 }
 
+func (s *Service) processExpandSourcesRequest(conn net.Conn) {
+	var sources influxql.Sources
+	if err := func() error {
+		// Parse request.
+		var req ExpandSourcesRequest
+		if err := DecodeLV(conn, &req); err != nil {
+			return err
+		}
+
+		// Collect iterator creators for each shard.
+		ics := make([]influxql.IteratorCreator, 0, len(req.ShardIDs))
+		for _, shardID := range req.ShardIDs {
+			ic := s.TSDBStore.ShardIteratorCreator(shardID)
+			if ic == nil {
+				return nil
+			}
+			ics = append(ics, ic)
+		}
+
+		// Expand sources from all shards.
+		a, err := influxql.IteratorCreators(ics).ExpandSources(req.Sources)
+		if err != nil {
+			return err
+		}
+		sources = a
+
+		return nil
+	}(); err != nil {
+		s.Logger.Printf("error reading ExpandSources request: %s", err)
+		EncodeTLV(conn, expandSourcesResponseMessage, &ExpandSourcesResponse{Err: err})
+		return
+	}
+
+	// Encode success response.
+	if err := EncodeTLV(conn, expandSourcesResponseMessage, &ExpandSourcesResponse{
+		Sources: sources,
+	}); err != nil {
+		s.Logger.Printf("error writing ExpandSources response: %s", err)
+		return
+	}
+}
+
 // ReadTLV reads a type-length-value record from r.
 func ReadTLV(r io.Reader) (byte, []byte, error) {
 	typ, err := ReadType(r)
diff --git a/cluster/shard_writer.go b/cluster/shard_writer.go
index 9a44137a8e..4a83f8b97d 100644
--- a/cluster/shard_writer.go
+++ b/cluster/shard_writer.go
@@ -24,6 +24,9 @@ const (
 
 	seriesKeysRequestMessage
 	seriesKeysResponseMessage
+
+	expandSourcesRequestMessage
+	expandSourcesResponseMessage
 )
 
 // ShardWriter writes a set of points to a shard.
diff --git a/influxql/ast.go b/influxql/ast.go
index cbfb1a2c04..59fa62da6e 100644
--- a/influxql/ast.go
+++ b/influxql/ast.go
@@ -309,6 +309,19 @@ func (a Sources) HasSystemSource() bool {
 	return false
 }
 
+// HasRegex returns true if any of the sources are regex measurements.
+func (a Sources) HasRegex() bool {
+	for _, s := range a {
+		switch s := s.(type) {
+		case *Measurement:
+			if s.Regex != nil {
+				return true
+			}
+		}
+	}
+	return false
+}
+
 // String returns a string representation of a Sources array.
 func (a Sources) String() string {
 	var buf bytes.Buffer
diff --git a/influxql/internal/internal.pb.go b/influxql/internal/internal.pb.go
index 03c7c5f580..74c19fef47 100644
--- a/influxql/internal/internal.pb.go
+++ b/influxql/internal/internal.pb.go
@@ -21,25 +21,23 @@ It has these top-level messages:
 package internal
 
 import proto "github.com/gogo/protobuf/proto"
-import fmt "fmt"
 import math "math"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
-var _ = fmt.Errorf
 var _ = math.Inf
 
 type Point struct {
-	Name             *string  `protobuf:"bytes,1,req,name=Name" json:"Name,omitempty"`
-	Tags             *string  `protobuf:"bytes,2,req,name=Tags" json:"Tags,omitempty"`
-	Time             *int64   `protobuf:"varint,3,req,name=Time" json:"Time,omitempty"`
-	Nil              *bool    `protobuf:"varint,4,req,name=Nil" json:"Nil,omitempty"`
-	Aux              []*Aux   `protobuf:"bytes,5,rep,name=Aux" json:"Aux,omitempty"`
-	Aggregated       *uint32  `protobuf:"varint,6,opt,name=Aggregated" json:"Aggregated,omitempty"`
-	FloatValue       *float64 `protobuf:"fixed64,7,opt,name=FloatValue" json:"FloatValue,omitempty"`
-	IntegerValue     *int64   `protobuf:"varint,8,opt,name=IntegerValue" json:"IntegerValue,omitempty"`
-	StringValue      *string  `protobuf:"bytes,9,opt,name=StringValue" json:"StringValue,omitempty"`
-	BooleanValue     *bool    `protobuf:"varint,10,opt,name=BooleanValue" json:"BooleanValue,omitempty"`
+	Name             *string  `protobuf:"bytes,1,req" json:"Name,omitempty"`
+	Tags             *string  `protobuf:"bytes,2,req" json:"Tags,omitempty"`
+	Time             *int64   `protobuf:"varint,3,req" json:"Time,omitempty"`
+	Nil              *bool    `protobuf:"varint,4,req" json:"Nil,omitempty"`
+	Aux              []*Aux   `protobuf:"bytes,5,rep" json:"Aux,omitempty"`
+	Aggregated       *uint32  `protobuf:"varint,6,opt" json:"Aggregated,omitempty"`
+	FloatValue       *float64 `protobuf:"fixed64,7,opt" json:"FloatValue,omitempty"`
+	IntegerValue     *int64   `protobuf:"varint,8,opt" json:"IntegerValue,omitempty"`
+	StringValue      *string  `protobuf:"bytes,9,opt" json:"StringValue,omitempty"`
+	BooleanValue     *bool    `protobuf:"varint,10,opt" json:"BooleanValue,omitempty"`
 	XXX_unrecognized []byte   `json:"-"`
 }
 
@@ -118,11 +116,11 @@ func (m *Point) GetBooleanValue() bool {
 }
 
 type Aux struct {
-	DataType         *int32   `protobuf:"varint,1,req,name=DataType" json:"DataType,omitempty"`
-	FloatValue       *float64 `protobuf:"fixed64,2,opt,name=FloatValue" json:"FloatValue,omitempty"`
-	IntegerValue     *int64   `protobuf:"varint,3,opt,name=IntegerValue" json:"IntegerValue,omitempty"`
-	StringValue      *string  `protobuf:"bytes,4,opt,name=StringValue" json:"StringValue,omitempty"`
-	BooleanValue     *bool    `protobuf:"varint,5,opt,name=BooleanValue" json:"BooleanValue,omitempty"`
+	DataType         *int32   `protobuf:"varint,1,req" json:"DataType,omitempty"`
+	FloatValue       *float64 `protobuf:"fixed64,2,opt" json:"FloatValue,omitempty"`
+	IntegerValue     *int64   `protobuf:"varint,3,opt" json:"IntegerValue,omitempty"`
+	StringValue      *string  `protobuf:"bytes,4,opt" json:"StringValue,omitempty"`
+	BooleanValue     *bool    `protobuf:"varint,5,opt" json:"BooleanValue,omitempty"`
 	XXX_unrecognized []byte   `json:"-"`
 }
 
@@ -166,22 +164,22 @@ func (m *Aux) GetBooleanValue() bool {
 }
 
 type IteratorOptions struct {
-	Expr             *string        `protobuf:"bytes,1,opt,name=Expr" json:"Expr,omitempty"`
-	Aux              []string       `protobuf:"bytes,2,rep,name=Aux" json:"Aux,omitempty"`
-	Sources          []*Measurement `protobuf:"bytes,3,rep,name=Sources" json:"Sources,omitempty"`
-	Interval         *Interval      `protobuf:"bytes,4,opt,name=Interval" json:"Interval,omitempty"`
-	Dimensions       []string       `protobuf:"bytes,5,rep,name=Dimensions" json:"Dimensions,omitempty"`
-	Fill             *int32         `protobuf:"varint,6,opt,name=Fill" json:"Fill,omitempty"`
-	FillValue        *float64       `protobuf:"fixed64,7,opt,name=FillValue" json:"FillValue,omitempty"`
-	Condition        *string        `protobuf:"bytes,8,opt,name=Condition" json:"Condition,omitempty"`
-	StartTime        *int64         `protobuf:"varint,9,opt,name=StartTime" json:"StartTime,omitempty"`
-	EndTime          *int64         `protobuf:"varint,10,opt,name=EndTime" json:"EndTime,omitempty"`
-	Ascending        *bool          `protobuf:"varint,11,opt,name=Ascending" json:"Ascending,omitempty"`
-	Limit            *int64         `protobuf:"varint,12,opt,name=Limit" json:"Limit,omitempty"`
-	Offset           *int64         `protobuf:"varint,13,opt,name=Offset" json:"Offset,omitempty"`
-	SLimit           *int64         `protobuf:"varint,14,opt,name=SLimit" json:"SLimit,omitempty"`
-	SOffset          *int64         `protobuf:"varint,15,opt,name=SOffset" json:"SOffset,omitempty"`
-	Dedupe           *bool          `protobuf:"varint,16,opt,name=Dedupe" json:"Dedupe,omitempty"`
+	Expr             *string        `protobuf:"bytes,1,opt" json:"Expr,omitempty"`
+	Aux              []string       `protobuf:"bytes,2,rep" json:"Aux,omitempty"`
+	Sources          []*Measurement `protobuf:"bytes,3,rep" json:"Sources,omitempty"`
+	Interval         *Interval      `protobuf:"bytes,4,opt" json:"Interval,omitempty"`
+	Dimensions       []string       `protobuf:"bytes,5,rep" json:"Dimensions,omitempty"`
+	Fill             *int32         `protobuf:"varint,6,opt" json:"Fill,omitempty"`
+	FillValue        *float64       `protobuf:"fixed64,7,opt" json:"FillValue,omitempty"`
+	Condition        *string        `protobuf:"bytes,8,opt" json:"Condition,omitempty"`
+	StartTime        *int64         `protobuf:"varint,9,opt" json:"StartTime,omitempty"`
+	EndTime          *int64         `protobuf:"varint,10,opt" json:"EndTime,omitempty"`
+	Ascending        *bool          `protobuf:"varint,11,opt" json:"Ascending,omitempty"`
+	Limit            *int64         `protobuf:"varint,12,opt" json:"Limit,omitempty"`
+	Offset           *int64         `protobuf:"varint,13,opt" json:"Offset,omitempty"`
+	SLimit           *int64         `protobuf:"varint,14,opt" json:"SLimit,omitempty"`
+	SOffset          *int64         `protobuf:"varint,15,opt" json:"SOffset,omitempty"`
+	Dedupe           *bool          `protobuf:"varint,16,opt" json:"Dedupe,omitempty"`
 	XXX_unrecognized []byte         `json:"-"`
 }
 
@@ -302,7 +300,7 @@ func (m *IteratorOptions) GetDedupe() bool {
 }
 
 type Measurements struct {
-	Items            []*Measurement `protobuf:"bytes,1,rep,name=Items" json:"Items,omitempty"`
+	Items            []*Measurement `protobuf:"bytes,1,rep" json:"Items,omitempty"`
 	XXX_unrecognized []byte         `json:"-"`
 }
 
@@ -318,11 +316,11 @@ func (m *Measurements) GetItems() []*Measurement {
 }
 
 type Measurement struct {
-	Database         *string `protobuf:"bytes,1,opt,name=Database" json:"Database,omitempty"`
-	RetentionPolicy  *string `protobuf:"bytes,2,opt,name=RetentionPolicy" json:"RetentionPolicy,omitempty"`
-	Name             *string `protobuf:"bytes,3,opt,name=Name" json:"Name,omitempty"`
-	Regex            *string `protobuf:"bytes,4,opt,name=Regex" json:"Regex,omitempty"`
-	IsTarget         *bool   `protobuf:"varint,5,opt,name=IsTarget" json:"IsTarget,omitempty"`
+	Database         *string `protobuf:"bytes,1,opt" json:"Database,omitempty"`
+	RetentionPolicy  *string `protobuf:"bytes,2,opt" json:"RetentionPolicy,omitempty"`
+	Name             *string `protobuf:"bytes,3,opt" json:"Name,omitempty"`
+	Regex            *string `protobuf:"bytes,4,opt" json:"Regex,omitempty"`
+	IsTarget         *bool   `protobuf:"varint,5,opt" json:"IsTarget,omitempty"`
 	XXX_unrecognized []byte  `json:"-"`
 }
 
@@ -366,8 +364,8 @@ func (m *Measurement) GetIsTarget() bool {
 }
 
 type Interval struct {
-	Duration         *int64 `protobuf:"varint,1,opt,name=Duration" json:"Duration,omitempty"`
-	Offset           *int64 `protobuf:"varint,2,opt,name=Offset" json:"Offset,omitempty"`
+	Duration         *int64 `protobuf:"varint,1,opt" json:"Duration,omitempty"`
+	Offset           *int64 `protobuf:"varint,2,opt" json:"Offset,omitempty"`
 	XXX_unrecognized []byte `json:"-"`
 }
 
@@ -390,9 +388,9 @@ func (m *Interval) GetOffset() int64 {
 }
 
 type Series struct {
-	Name             *string  `protobuf:"bytes,1,opt,name=Name" json:"Name,omitempty"`
-	Tags             []byte   `protobuf:"bytes,2,opt,name=Tags" json:"Tags,omitempty"`
-	Aux              []uint32 `protobuf:"varint,3,rep,name=Aux" json:"Aux,omitempty"`
+	Name             *string  `protobuf:"bytes,1,opt" json:"Name,omitempty"`
+	Tags             []byte   `protobuf:"bytes,2,opt" json:"Tags,omitempty"`
+	Aux              []uint32 `protobuf:"varint,3,rep" json:"Aux,omitempty"`
 	XXX_unrecognized []byte   `json:"-"`
 }
 
@@ -422,7 +420,7 @@ func (m *Series) GetAux() []uint32 {
 }
 
 type SeriesList struct {
-	Items            []*Series `protobuf:"bytes,1,rep,name=Items" json:"Items,omitempty"`
+	Items            []*Series `protobuf:"bytes,1,rep" json:"Items,omitempty"`
 	XXX_unrecognized []byte    `json:"-"`
 }
 
@@ -438,12 +436,4 @@ func (m *SeriesList) GetItems() []*Series {
 }
 
 func init() {
-	proto.RegisterType((*Point)(nil), "internal.Point")
-	proto.RegisterType((*Aux)(nil), "internal.Aux")
-	proto.RegisterType((*IteratorOptions)(nil), "internal.IteratorOptions")
-	proto.RegisterType((*Measurements)(nil), "internal.Measurements")
-	proto.RegisterType((*Measurement)(nil), "internal.Measurement")
-	proto.RegisterType((*Interval)(nil), "internal.Interval")
-	proto.RegisterType((*Series)(nil), "internal.Series")
-	proto.RegisterType((*SeriesList)(nil), "internal.SeriesList")
 }
diff --git a/influxql/iterator.gen.go b/influxql/iterator.gen.go
index a19ba34581..2754407635 100644
--- a/influxql/iterator.gen.go
+++ b/influxql/iterator.gen.go
@@ -612,6 +612,10 @@ func (itr *floatAuxIterator) SeriesKeys(opt IteratorOptions) (SeriesList, error)
 	return nil, errors.New("not implemented")
 }
 
+func (itr *floatAuxIterator) ExpandSources(sources Sources) (Sources, error) {
+	return nil, errors.New("not implemented")
+}
+
 func (itr *floatAuxIterator) stream() {
 	for {
 		// Read next point.
@@ -1750,6 +1754,10 @@ func (itr *integerAuxIterator) SeriesKeys(opt IteratorOptions) (SeriesList, erro
 	return nil, errors.New("not implemented")
 }
 
+func (itr *integerAuxIterator) ExpandSources(sources Sources) (Sources, error) {
+	return nil, errors.New("not implemented")
+}
+
 func (itr *integerAuxIterator) stream() {
 	for {
 		// Read next point.
@@ -2888,6 +2896,10 @@ func (itr *stringAuxIterator) SeriesKeys(opt IteratorOptions) (SeriesList, error
 	return nil, errors.New("not implemented")
 }
 
+func (itr *stringAuxIterator) ExpandSources(sources Sources) (Sources, error) {
+	return nil, errors.New("not implemented")
+}
+
 func (itr *stringAuxIterator) stream() {
 	for {
 		// Read next point.
@@ -4026,6 +4038,10 @@ func (itr *booleanAuxIterator) SeriesKeys(opt IteratorOptions) (SeriesList, erro
 	return nil, errors.New("not implemented")
 }
 
+func (itr *booleanAuxIterator) ExpandSources(sources Sources) (Sources, error) {
+	return nil, errors.New("not implemented")
+}
+
 func (itr *booleanAuxIterator) stream() {
 	for {
 		// Read next point.
diff --git a/influxql/iterator.gen.go.tmpl b/influxql/iterator.gen.go.tmpl
index 661e489300..b4d72f2166 100644
--- a/influxql/iterator.gen.go.tmpl
+++ b/influxql/iterator.gen.go.tmpl
@@ -611,7 +611,11 @@ func (itr *{{$k.name}}AuxIterator) SeriesKeys(opt IteratorOptions) (SeriesList,
 	return nil, errors.New("not implemented")
 }
 
-func (itr *{{$k.name}}AuxIterator) stream() {
+func (itr *{{.name}}AuxIterator) ExpandSources(sources Sources) (Sources, error) {
+	return nil, errors.New("not implemented")
+}
+
+func (itr *{{.name}}AuxIterator) stream() {
 	for {
 		// Read next point.
 		p := itr.input.Next()
diff --git a/influxql/iterator.go b/influxql/iterator.go
index cee4cc3ae6..b2bdc44482 100644
--- a/influxql/iterator.go
+++ b/influxql/iterator.go
@@ -444,6 +444,9 @@ type IteratorCreator interface {
 
 	// Returns the series keys that will be returned by this iterator.
 	SeriesKeys(opt IteratorOptions) (SeriesList, error)
+
+	// Expands regex sources to all matching sources.
+	ExpandSources(sources Sources) (Sources, error)
 }
 
 // IteratorCreators represents a list of iterator creators.
@@ -544,6 +547,42 @@ func (a IteratorCreators) SeriesKeys(opt IteratorOptions) (SeriesList, error) {
 	return SeriesList(seriesList), nil
 }
 
+// ExpandSources expands sources across all iterator creators and returns a unique result.
+func (a IteratorCreators) ExpandSources(sources Sources) (Sources, error) {
+	m := make(map[string]Source)
+
+	for _, ic := range a {
+		expanded, err := ic.ExpandSources(sources)
+		if err != nil {
+			return nil, err
+		}
+
+		for _, src := range expanded {
+			switch src := src.(type) {
+			case *Measurement:
+				m[src.String()] = src
+			default:
+				return nil, fmt.Errorf("IteratorCreators.ExpandSources: unsupported source type: %T", src)
+			}
+		}
+	}
+
+	// Convert set to sorted slice.
+	names := make([]string, 0, len(m))
+	for name := range m {
+		names = append(names, name)
+	}
+	sort.Strings(names)
+
+	// Convert set to a list of Sources.
+	sorted := make(Sources, 0, len(m))
+	for _, name := range names {
+		sorted = append(sorted, m[name])
+	}
+
+	return sorted, nil
+}
+
 // IteratorOptions is an object passed to CreateIterator to specify creation options.
 type IteratorOptions struct {
 	// Expression to iterate for.
diff --git a/influxql/iterator_test.go b/influxql/iterator_test.go
index 668d7e47df..5d9ca71d3d 100644
--- a/influxql/iterator_test.go
+++ b/influxql/iterator_test.go
@@ -959,6 +959,7 @@ type IteratorCreator struct {
 	CreateIteratorFn  func(opt influxql.IteratorOptions) (influxql.Iterator, error)
 	FieldDimensionsFn func(sources influxql.Sources) (fields, dimensions map[string]struct{}, err error)
 	SeriesKeysFn      func(opt influxql.IteratorOptions) (influxql.SeriesList, error)
+	ExpandSourcesFn   func(sources influxql.Sources) (influxql.Sources, error)
 }
 
 func (ic *IteratorCreator) CreateIterator(opt influxql.IteratorOptions) (influxql.Iterator, error) {
@@ -1010,6 +1011,10 @@ func (ic *IteratorCreator) SeriesKeys(opt influxql.IteratorOptions) (influxql.Se
 	return influxql.SeriesList(seriesList), nil
 }
 
+func (ic *IteratorCreator) ExpandSources(sources influxql.Sources) (influxql.Sources, error) {
+	return ic.ExpandSourcesFn(sources)
+}
+
 // Test implementation of influxql.FloatIterator
 type FloatIterator struct {
 	Points []influxql.FloatPoint
diff --git a/tsdb/shard.go b/tsdb/shard.go
index 3b9b58d5c3..8f236f6948 100644
--- a/tsdb/shard.go
+++ b/tsdb/shard.go
@@ -491,6 +491,53 @@ func (s *Shard) SeriesKeys(opt influxql.IteratorOptions) (influxql.SeriesList, e
 	return s.engine.SeriesKeys(opt)
 }
 
+// ExpandSources expands regex sources and removes duplicates.
+// NOTE: sources must be normalized (db and rp set) before calling this function.
+func (s *Shard) ExpandSources(sources influxql.Sources) (influxql.Sources, error) {
+	// Use a map as a set to prevent duplicates.
+	set := map[string]influxql.Source{}
+
+	// Iterate all sources, expanding regexes when they're found.
+	for _, source := range sources {
+		switch src := source.(type) {
+		case *influxql.Measurement:
+			// Add non-regex measurements directly to the set.
+			if src.Regex == nil {
+				set[src.String()] = src
+				continue
+			}
+
+			// Loop over matching measurements.
+			for _, m := range s.index.MeasurementsByRegex(src.Regex.Val) {
+				other := &influxql.Measurement{
+					Database:        src.Database,
+					RetentionPolicy: src.RetentionPolicy,
+					Name:            m.Name,
+				}
+				set[other.String()] = other
+			}
+
+		default:
+			return nil, fmt.Errorf("expandSources: unsupported source type: %T", source)
+		}
+	}
+
+	// Convert set to sorted slice.
+	names := make([]string, 0, len(set))
+	for name := range set {
+		names = append(names, name)
+	}
+	sort.Strings(names)
+
+	// Convert set to a list of Sources.
+	expanded := make(influxql.Sources, 0, len(set))
+	for _, name := range names {
+		expanded = append(expanded, set[name])
+	}
+
+	return expanded, nil
+}
+
 // Shards represents a sortable list of shards.
 type Shards []*Shard
 
@@ -844,6 +891,9 @@ func (ic *shardIteratorCreator) FieldDimensions(sources influxql.Sources) (field
 func (ic *shardIteratorCreator) SeriesKeys(opt influxql.IteratorOptions) (influxql.SeriesList, error) {
 	return ic.sh.SeriesKeys(opt)
 }
+func (ic *shardIteratorCreator) ExpandSources(sources influxql.Sources) (influxql.Sources, error) {
+	return ic.sh.ExpandSources(sources)
+}
 
 func NewFieldKeysIterator(sh *Shard, opt influxql.IteratorOptions) (influxql.Iterator, error) {
 	fn := func(m *Measurement) []string {
diff --git a/tsdb/store.go b/tsdb/store.go
index 51266de99d..eb67902e95 100644
--- a/tsdb/store.go
+++ b/tsdb/store.go
@@ -486,6 +486,15 @@ func (s *Store) ShardRelativePath(id uint64) (string, error) {
 
 // DeleteSeries loops through the local shards and deletes the series data and metadata for the passed in series keys
 func (s *Store) DeleteSeries(database string, sources []influxql.Source, condition influxql.Expr) error {
+	// Expand regex expressions in the FROM clause.
+	a, err := s.ExpandSources(sources)
+	if err != nil {
+		return err
+	} else if sources != nil && len(sources) != 0 && len(a) == 0 {
+		return nil
+	}
+	sources = a
+
 	s.mu.RLock()
 	defer s.mu.RUnlock()
 
@@ -495,15 +504,6 @@ func (s *Store) DeleteSeries(database string, sources []influxql.Source, conditi
 		return nil
 	}
 
-	// Expand regex expressions in the FROM clause.
-	a, err := s.expandSources(sources)
-	if err != nil {
-		return err
-	} else if sources != nil && len(sources) != 0 && len(a) == 0 {
-		return nil
-	}
-	sources = a
-
 	measurements, err := measurementsFromSourcesOrDB(db, sources...)
 	if err != nil {
 		return err
@@ -566,63 +566,21 @@ func (s *Store) deleteSeries(database string, seriesKeys []string) error {
 	return nil
 }
 
-// ExpandSources expands regex sources and removes duplicates.
-// NOTE: sources must be normalized (db and rp set) before calling this function.
+// ExpandSources expands sources against all local shards.
 func (s *Store) ExpandSources(sources influxql.Sources) (influxql.Sources, error) {
-	s.mu.RLock()
-	defer s.mu.RUnlock()
-	return s.expandSources(sources)
+	return s.IteratorCreators().ExpandSources(sources)
 }
 
-func (s *Store) expandSources(sources influxql.Sources) (influxql.Sources, error) {
-	// Use a map as a set to prevent duplicates.
-	set := map[string]influxql.Source{}
+// IteratorCreators returns a set of all local shards as iterator creators.
+func (s *Store) IteratorCreators() influxql.IteratorCreators {
+	s.mu.Lock()
+	defer s.mu.Unlock()
 
-	// Iterate all sources, expanding regexes when they're found.
-	for _, source := range sources {
-		switch src := source.(type) {
-		case *influxql.Measurement:
-			// Add non-regex measurements directly to the set.
-			if src.Regex == nil {
-				set[src.String()] = src
-				continue
-			}
-
-			// Lookup the database.
-			db := s.databaseIndexes[src.Database]
-			if db == nil {
-				return nil, nil
-			}
-
-			// Loop over matching measurements.
-			for _, m := range db.MeasurementsByRegex(src.Regex.Val) {
-				other := &influxql.Measurement{
-					Database:        src.Database,
-					RetentionPolicy: src.RetentionPolicy,
-					Name:            m.Name,
-				}
-				set[other.String()] = other
-			}
-
-		default:
-			return nil, fmt.Errorf("expandSources: unsupported source type: %T", source)
-		}
+	a := make(influxql.IteratorCreators, 0, len(s.shards))
+	for _, sh := range s.shards {
+		a = append(a, sh)
 	}
-
-	// Convert set to sorted slice.
-	names := make([]string, 0, len(set))
-	for name := range set {
-		names = append(names, name)
-	}
-	sort.Strings(names)
-
-	// Convert set to a list of Sources.
-	expanded := make(influxql.Sources, 0, len(set))
-	for _, name := range names {
-		expanded = append(expanded, set[name])
-	}
-
-	return expanded, nil
+	return a
 }
 
 // WriteToShard writes a list of points to a shard identified by its ID.