From a75cc09cdfa80b4ec9aadf1e536cd902030086a1 Mon Sep 17 00:00:00 2001
From: Chris Lu <chrislusf@users.noreply.github.com>
Date: Mon, 5 Jan 2026 22:13:56 -0800
Subject: [PATCH] test: fix EC integration test needle blob mismatch (#7972)

fix needle blob
---
 test/erasure_coding/ec_integration_test.go | 37 ++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

diff --git a/test/erasure_coding/ec_integration_test.go b/test/erasure_coding/ec_integration_test.go
index f42e586cc..75aaf5025 100644
--- a/test/erasure_coding/ec_integration_test.go
+++ b/test/erasure_coding/ec_integration_test.go
@@ -18,6 +18,8 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/seaweedfs/seaweedfs/weed/shell"
 	"github.com/seaweedfs/seaweedfs/weed/storage/needle"
+	"github.com/seaweedfs/seaweedfs/weed/storage/types"
+	"github.com/seaweedfs/seaweedfs/weed/util"
 	"github.com/seaweedfs/seaweedfs/weed/wdclient"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -2363,16 +2365,47 @@ func TestECEncodeReplicatedVolumeSync(t *testing.T) {
 // injectNeedleToOneReplica writes a needle directly to one replica to create divergence
 func injectNeedleToOneReplica(grpcDialOption grpc.DialOption, vid needle.VolumeId, location wdclient.Location, needleId uint64, data []byte) error {
 	return operation.WithVolumeServerClient(false, location.ServerAddress(), grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+		blob, size := generateNeedleBlobV3(needleId, data)
 		_, err := client.WriteNeedleBlob(context.Background(), &volume_server_pb.WriteNeedleBlobRequest{
 			VolumeId:   uint32(vid),
 			NeedleId:   needleId,
-			Size:       int32(len(data)),
-			NeedleBlob: data,
+			Size:       size,
+			NeedleBlob: blob,
 		})
 		return err
 	})
 }
 
+func generateNeedleBlobV3(needleId uint64, data []byte) ([]byte, int32) {
+	// Overhead: DataSize(4) + Data(N) + Flags(1)
+	size := 4 + len(data) + 1
+
+	// Create struct to calculate padding
+	// Padding is based on the Size field (DataSize + Overhead)
+	padding := needle.PaddingLength(types.Size(size), needle.Version3)
+
+	blob := make([]byte, 16+size+4+8+int(padding)) // Header(16) + Body(Size) + Checksum(4) + Timestamp(8) + Padding
+
+	// Header
+	util.Uint32toBytes(blob[0:4], 0x12345678) // Cookie
+	util.Uint64toBytes(blob[4:12], needleId)
+	util.Uint32toBytes(blob[12:16], uint32(size))
+
+	// Body
+	util.Uint32toBytes(blob[16:20], uint32(len(data)))
+	copy(blob[20:], data)
+	blob[20+len(data)] = 0 // Flags
+
+	// Checksum
+	crc := needle.NewCRC(data)
+	util.Uint32toBytes(blob[20+len(data)+1:20+len(data)+1+4], crc.Value())
+
+	// Timestamp (space reserved, filled by server)
+	// Padding (zeroes)
+
+	return blob, int32(size)
+}
+
 // uploadTestDataWithReplication uploads test data and returns the volume ID
 // using the specified collection and replication level. All files are uploaded to the same volume.
 func uploadTestDataWithReplication(t *testing.T, masterAddr string, collection string, replication string) (needle.VolumeId, error) {