Support parquet file-wide configuration allows to tune I/O performanc…

…e and file size

cmd/columnify/columnify.go

@@ -36,6 +36,11 @@ func main() {
 	recordType := flag.String("recordType", "jsonl", "record data format type, [avro|csv|jsonl|ltsv|msgpack|tsv]")
 	output := flag.String("output", "", "path to output file; default: stdout")
 
+	// parquet specific options
+	parquetPageSize := flag.Int64("parquetPageSize", 8*1024, "parquet file page size, default: 8kB")
+	parquetRowGroupSize := flag.Int64("parquetRowGroupSize", 128*1024*1024, "parquet file row group size, default: 128MB")
+	parquetCompressionCodec := flag.String("parquetCompressionCodec", "SNAPPY", "parquet compression codec, default: SNAPPY")
+
 	flag.Parse()
 
 	files := flag.Args()
@@ -45,7 +50,12 @@ func main() {
 		log.Fatalf("Missed required parameter(s)")
 	}
 
-	c, err := columnifier.NewColumnifier(*schemaType, *schemaFile, *recordType, *output)
+	config, err := columnifier.NewConfig(*parquetPageSize, *parquetRowGroupSize, *parquetCompressionCodec)
+	if err != nil {
+		log.Fatalf("Failed to init: %v\n", err)
+	}
+
+	c, err := columnifier.NewColumnifier(*schemaType, *schemaFile, *recordType, *output, *config)
 	if err != nil {
 		log.Fatalf("Failed to init: %v\n", err)
 	}

columnifier/columnifier.go

@@ -10,6 +10,6 @@ type Columnifier interface {
 }
 
 // NewColumnifier creates a new Columnifier.
-func NewColumnifier(st string, sf string, rt string, o string) (Columnifier, error) {
-	return NewParquetColumnifier(st, sf, rt, o)
+func NewColumnifier(st string, sf string, rt string, o string, config Config) (Columnifier, error) {
+	return NewParquetColumnifier(st, sf, rt, o, config)
 }

columnifier/config.go

@@ -0,0 +1,30 @@
+package columnifier
+
+import (
+	"github.com/xitongsys/parquet-go/parquet"
+)
+
+type Config struct {
+	Parquet Parquet
+}
+
+type Parquet struct {
+	PageSize         int64
+	RowGroupSize     int64
+	CompressionCodec parquet.CompressionCodec
+}
+
+func NewConfig(parquetPageSize, parquetRowGroupSize int64, parquetCompressionCodec string) (*Config, error) {
+	cc, err := parquet.CompressionCodecFromString(parquetCompressionCodec)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Config{
+		Parquet: Parquet{
+			PageSize:         parquetPageSize,
+			RowGroupSize:     parquetRowGroupSize,
+			CompressionCodec: cc,
+		},
+	}, nil
+}

columnifier/config_test.go

@@ -0,0 +1,52 @@
+package columnifier
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/xitongsys/parquet-go/parquet"
+)
+
+func TestNewConfig(t *testing.T) {
+	cases := []struct {
+		parquetPageSize         int64
+		parquetRowGroupSize     int64
+		parquetCompressionCodec string
+		expected                *Config
+		isErr                   bool
+	}{
+		{
+			parquetPageSize:         8 * 1024,
+			parquetRowGroupSize:     128 * 1024 * 1024,
+			parquetCompressionCodec: "SNAPPY",
+			expected: &Config{
+				Parquet: Parquet{
+					PageSize:         8 * 1024,
+					RowGroupSize:     128 * 1024 * 1024,
+					CompressionCodec: parquet.CompressionCodec_SNAPPY,
+				},
+			},
+			isErr: false,
+		},
+
+		{
+			parquetPageSize:         8 * 1024,
+			parquetRowGroupSize:     128 * 1024 * 1024,
+			parquetCompressionCodec: "INVALID",
+			expected:                nil,
+			isErr:                   true,
+		},
+	}
+
+	for _, c := range cases {
+		actual, err := NewConfig(c.parquetPageSize, c.parquetRowGroupSize, c.parquetCompressionCodec)
+
+		if err != nil != c.isErr {
+			t.Errorf("expected %v, but actual %v", c.isErr, err)
+		}
+
+		if !reflect.DeepEqual(actual, c.expected) {
+			t.Errorf("expected %v, but actual %v", c.expected, actual)
+		}
+	}
+}

columnifier/parquet.go

@@ -20,7 +20,7 @@ type parquetColumnifier struct {
 }
 
 // NewParquetColumnifier creates a new parquetColumnifier.
-func NewParquetColumnifier(st string, sf string, rt string, output string) (*parquetColumnifier, error) {
+func NewParquetColumnifier(st string, sf string, rt string, output string, config Config) (*parquetColumnifier, error) {
 	schemaContent, err := ioutil.ReadFile(sf)
 	if err != nil {
 		return nil, err
@@ -53,6 +53,10 @@ func NewParquetColumnifier(st string, sf string, rt string, output string) (*par
 	w.SchemaHandler = sh
 	w.Footer.Schema = append(w.Footer.Schema, sh.SchemaElements...)
 
+	w.PageSize = config.Parquet.PageSize
+	w.RowGroupSize = config.Parquet.RowGroupSize
+	w.CompressionType = config.Parquet.CompressionCodec
+
 	return &parquetColumnifier{
 		w:      w,
 		schema: intermediateSchema,