s3: fix s3 concurrent uploader will overwrite error (#48163) (#49220)

close #48164

br/pkg/storage/s3.go

@@ -954,9 +954,10 @@ func (rs *S3Storage) Create(ctx context.Context, name string, option *WriterOpti
  s3Writer.wg.Add(1)
  go func() {
  _, err := up.UploadWithContext(ctx, upParams)
- err1 := rd.Close()
+ // like a channel we only let sender close the pipe in happy path
  if err != nil {
- log.Warn("upload to s3 failed", zap.String("filename", name), zap.Error(err), zap.Error(err1))
+ log.Warn("upload to s3 failed", zap.String("filename", name), zap.Error(err))
+ _ = rd.CloseWithError(err)
  }
  s3Writer.err = err
  s3Writer.wg.Done()

br/pkg/storage/s3_test.go

@@ -477,6 +477,24 @@ func TestWriteNoError(t *testing.T) {
  require.NoError(t, err)
 }
 
+func TestMultiUploadErrorNotOverwritten(t *testing.T) {
+ s := createS3Suite(t)
+ ctx := aws.BackgroundContext()
+
+ s.s3.EXPECT().
+ CreateMultipartUploadWithContext(ctx, gomock.Any(), gomock.Any()).
+ Return(nil, errors.New("mock error"))
+
+ w, err := s.storage.Create(ctx, "file", &WriterOption{Concurrency: 2})
+ require.NoError(t, err)
+ // data should be larger than 5MB to trigger CreateMultipartUploadWithContext path
+ data := make([]byte, 5*1024*1024+6716)
+ n, err := w.Write(ctx, data)
+ require.NoError(t, err)
+ require.Equal(t, 5*1024*1024+6716, n)
+ require.ErrorContains(t, w.Close(ctx), "mock error")
+}
+
 // TestReadNoError ensures the ReadFile API issues a GetObject request and correctly
 // read the entire body.
 func TestReadNoError(t *testing.T) {