add lz4

internal/client/snapshot.go

@@ -5,7 +5,6 @@ package client
 
 import (
 	"bytes"
-	"compress/gzip"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -17,6 +16,7 @@ import (
 	"time"
 
 	"github.com/mistifyio/go-zfs"
+	"github.com/pierrec/lz4/v4"
 )
 
 // SnapshotPolicy defines retention settings for automatic snapshots.
@@ -220,17 +220,18 @@ func (c *Client) streamIncrementalToS3(snapshot *zfs.Dataset, base, uploadURL, s
 
 	var reader io.Reader = zfsOut
 
-	// Apply gzip compression if enabled
+	// Apply LZ4 compression if enabled
 	if c.config.Compress {
-		fmt.Printf("  Compressing with gzip...\n")
+		fmt.Printf("  Compressing with LZ4...\n")
 		pr, pw := io.Pipe()
-		gzWriter := gzip.NewWriter(pw)
+		lz4Writer := lz4.NewWriter(pw)
+		lz4Writer.Apply(lz4.BlockSizeOption(lz4.BlockSize(4 * 1024 * 1024))) // 4MB blocks for better performance
 
 		go func() {
-			// Copy zfs output to gzip writer
-			io.Copy(gzWriter, zfsOut)
-			// Close gzip writer first to flush footer, then close pipe
-			gzWriter.Close()
+			// Copy zfs output to LZ4 writer
+			io.Copy(lz4Writer, zfsOut)
+			// Close LZ4 writer first to flush, then close pipe
+			lz4Writer.Close()
 			pw.Close()
 		}()