diff --git a/vendor/github.com/Shopify/sarama/record_batch.go b/vendor/github.com/Shopify/sarama/record_batch.go
index a36f7e6..c653763 100644
--- a/vendor/github.com/Shopify/sarama/record_batch.go
+++ b/vendor/github.com/Shopify/sarama/record_batch.go
@@ -45,11 +45,16 @@
 	FirstSequence         int32
 	Records               []*Record
 	PartialTrailingRecord bool
+	IsTransactional       bool
 
 	compressedRecords []byte
 	recordsLen        int // uncompressed records size
 }
 
+func (b *RecordBatch) LastOffset() int64 {
+	return b.FirstOffset + int64(b.LastOffsetDelta)
+}
+
 func (b *RecordBatch) encode(pe packetEncoder) error {
 	if b.Version != 2 {
 		return PacketEncodingError{fmt.Sprintf("unsupported compression codec (%d)", b.Codec)}
@@ -111,7 +116,10 @@
 		return err
 	}
 
-	if err = pd.push(&crc32Field{polynomial: crcCastagnoli}); err != nil {
+	crc32Decoder := acquireCrc32Field(crcCastagnoli)
+	defer releaseCrc32Field(crc32Decoder)
+
+	if err = pd.push(crc32Decoder); err != nil {
 		return err
 	}
 
@@ -122,6 +130,7 @@
 	b.Codec = CompressionCodec(int8(attributes) & compressionCodecMask)
 	b.Control = attributes&controlMask == controlMask
 	b.LogAppendTime = attributes&timestampTypeMask == timestampTypeMask
+	b.IsTransactional = attributes&isTransactionalMask == isTransactionalMask
 
 	if b.LastOffsetDelta, err = pd.getInt32(); err != nil {
 		return err
@@ -205,6 +214,9 @@
 	if b.LogAppendTime {
 		attr |= timestampTypeMask
 	}
+	if b.IsTransactional {
+		attr |= isTransactionalMask
+	}
 	return attr
 }