diff --git a/client/internal/downloader/strategy/selector.go b/client/internal/downloader/strategy/selector.go
index 98f81c5..c315bb0 100644
--- a/client/internal/downloader/strategy/selector.go
+++ b/client/internal/downloader/strategy/selector.go
@@ -39,7 +39,7 @@ type ECReconstructStrategy struct {
 	Detail     jcstypes.ObjectDetail
 	Redundancy jcstypes.ECRedundancy
 	Blocks     []jcstypes.ObjectBlock
-	UserSpaces []jcstypes.UserSpaceDetail
+	UserSpaces []jcstypes.UserSpaceDetail // 与Blocks一一对应，表示每个Block应该从哪个UserSpace下载
 }
 
 func (s *ECReconstructStrategy) GetDetail() jcstypes.ObjectDetail {
@@ -50,7 +50,7 @@ type LRCReconstructStrategy struct {
 	Detail     jcstypes.ObjectDetail
 	Redundancy jcstypes.LRCRedundancy
 	Blocks     []jcstypes.ObjectBlock
-	Spaces     []jcstypes.UserSpaceDetail
+	Spaces     []jcstypes.UserSpaceDetail // 与Blocks一一对应，表示每个Block应该从哪个UserSpace下载
 }
 
 func (s *LRCReconstructStrategy) GetDetail() jcstypes.ObjectDetail {
diff --git a/client/internal/services/user_space.go b/client/internal/services/user_space.go
index 9e76238..2ff3b09 100644
--- a/client/internal/services/user_space.go
+++ b/client/internal/services/user_space.go
@@ -245,9 +245,9 @@ func (svc *UserSpaceService) DownloadPackage(req cliapi.UserSpaceDownloadPackage
 					if shouldAtClient && strg.UserSpaces[i].RecommendHub != nil {
 						newSpace := strg.UserSpaces[i]
 						newSpace.RecommendHub = nil
-						ft.AddFrom(ioswitch2.NewFromShardstore(b.FileHash, newSpace, ioswitch2.RawStream()))
+						ft.AddFrom(ioswitch2.NewFromShardstore(b.FileHash, newSpace, ioswitch2.ECStream(b.Index)))
 					} else {
-						ft.AddFrom(ioswitch2.NewFromShardstore(b.FileHash, strg.UserSpaces[i], ioswitch2.RawStream()))
+						ft.AddFrom(ioswitch2.NewFromShardstore(b.FileHash, strg.UserSpaces[i], ioswitch2.ECStream(b.Index)))
 					}
 
 					ft.ECParam = &strg.Redundancy
diff --git a/client/internal/ticktock/redundancy_shrink.go b/client/internal/ticktock/redundancy_shrink.go
index 50f115f..aeb9b1e 100644
--- a/client/internal/ticktock/redundancy_shrink.go
+++ b/client/internal/ticktock/redundancy_shrink.go
@@ -509,6 +509,7 @@ func (t *ChangeRedundancy) initBlockList(ctx *annealingState) {
 			if blocks[i].Index == b.Index {
 				blocks[i].HasEntity = true
 				blocks[i].FileHash = b.FileHash
+				blocks[i].Size = b.Size
 				has = true
 				break
 			}
diff --git a/common/pkgs/ioswitch/exec/executor.go b/common/pkgs/ioswitch/exec/executor.go
index 13fb7b5..7db9801 100644
--- a/common/pkgs/ioswitch/exec/executor.go
+++ b/common/pkgs/ioswitch/exec/executor.go
@@ -85,7 +85,11 @@ func (s *Executor) runOps(ops []Op, ctx *ExecContext, cancel context.CancelFunc)
 						err = context.Canceled
 					}
 				} else {
-					err = multierror.Append(err, fmt.Errorf("%T: %w", op, e))
+					if err == context.Canceled {
+						err = e
+					} else {
+						err = multierror.Append(err, fmt.Errorf("%T: %w", op, e))
+					}
 				}
 				lock.Unlock()