diff --git a/core/src/db/snapshot/CompoundOperations.cpp b/core/src/db/snapshot/CompoundOperations.cpp
index ad0be26bbfc9dd08579a491263e6a6ce2ca82631..c584b3681b70dc2d0c99b5793c12f26d56678990 100644
--- a/core/src/db/snapshot/CompoundOperations.cpp
+++ b/core/src/db/snapshot/CompoundOperations.cpp
@@ -66,7 +66,9 @@ Status
 BuildOperation::CheckSegmentStale(ScopedSnapshotT& latest_snapshot, ID_TYPE segment_id) const {
     auto segment = latest_snapshot->GetResource<Segment>(segment_id);
     if (!segment) {
-        return Status(SS_STALE_ERROR, "BuildOperation target segment is stale");
+        std::stringstream emsg;
+        emsg << GetRepr() << ". Target segment " << segment_id << " is stale";
+        return Status(SS_STALE_ERROR, emsg.str());
     }
     return Status::OK();
 }
@@ -79,7 +81,9 @@ BuildOperation::CommitNewSegmentFile(const SegmentFileContext& context, SegmentF
         return status;
     auto segment = GetStartedSS()->GetResource<Segment>(context.segment_id);
     if (!segment) {
-        return Status(SS_INVALID_CONTEX_ERROR, "Invalid segment_id in context");
+        std::stringstream emsg;
+        emsg << GetRepr() << ". Invalid segment " << context.segment_id << " in context";
+        return Status(SS_INVALID_CONTEX_ERROR, emsg.str());
     }
     auto ctx = context;
     ctx.partition_id = segment->GetPartitionId();
@@ -190,7 +194,9 @@ MergeOperation::OnSnapshotStale() {
         auto expect_sc = GetStartedSS()->GetSegmentCommitBySegmentId(stale_seg->GetID());
         auto latest_sc = GetAdjustedSS()->GetSegmentCommitBySegmentId(stale_seg->GetID());
         if (!latest_sc || (latest_sc->GetID() != expect_sc->GetID())) {
-            return Status(SS_STALE_ERROR, "MergeOperation on stale segments");
+            std::stringstream emsg;
+            emsg << GetRepr() << ". Stale segment " << stale_seg->GetID() << " in context";
+            return Status(SS_STALE_ERROR, emsg.str());
         }
     }
     return Status::OK();
@@ -349,8 +355,11 @@ DropPartitionOperation::DoExecute(Store& store) {
     if (!status.ok())
         return status;
     auto p_c = GetAdjustedSS()->GetPartitionCommitByPartitionId(id);
-    if (!p_c)
-        return Status(SS_NOT_FOUND_ERROR, "No partition commit found");
+    if (!p_c) {
+        std::stringstream emsg;
+        emsg << GetRepr() << ". PartitionCommit " << id << " not found";
+        return Status(SS_NOT_FOUND_ERROR, emsg.str());
+    }
     context_.stale_partition_commit = p_c;
 
     OperationContext op_ctx;
@@ -378,7 +387,9 @@ CreatePartitionOperation::PreCheck() {
         return status;
     }
     if (!context_.new_partition) {
-        status = Status(SS_INVALID_CONTEX_ERROR, "No partition specified before push partition");
+        std::stringstream emsg;
+        emsg << GetRepr() << ". Partition is missing";
+        status = Status(SS_INVALID_CONTEX_ERROR, emsg.str());
     }
     return status;
 }
@@ -531,8 +542,11 @@ CreateCollectionOperation::GetSnapshot(ScopedSnapshotT& ss) const {
     status = IDSNotEmptyRequried();
     if (!status.ok())
         return status;
-    if (!c_context_.collection_commit)
-        return Status(SS_CONSTRAINT_CHECK_ERROR, "No Snapshot is available");
+    if (!c_context_.collection_commit) {
+        std::stringstream emsg;
+        emsg << GetRepr() << ". No snapshot is available";
+        return Status(SS_CONSTRAINT_CHECK_ERROR, emsg.str());
+    }
     /* status = Snapshots::GetInstance().GetSnapshot(ss, c_context_.collection_commit->GetCollectionId()); */
     ss = context_.latest_ss;
     return status;
@@ -541,7 +555,9 @@ CreateCollectionOperation::GetSnapshot(ScopedSnapshotT& ss) const {
 Status
 DropCollectionOperation::DoExecute(Store& store) {
     if (!context_.collection) {
-        return Status(SS_INVALID_CONTEX_ERROR, "Invalid Context");
+        std::stringstream emsg;
+        emsg << GetRepr() << ". Collection is missing in context";
+        return Status(SS_INVALID_CONTEX_ERROR, emsg.str());
     }
     context_.collection->Deactivate();
     AddStepWithLsn(*context_.collection, context_.lsn);
diff --git a/core/src/db/snapshot/Operations.cpp b/core/src/db/snapshot/Operations.cpp
index 3657ddaaec4c641b3b48b9cb2ad5c5146ec4545b..8a73b39bdbdf874b44653c97656833b7c8994935 100644
--- a/core/src/db/snapshot/Operations.cpp
+++ b/core/src/db/snapshot/Operations.cpp
@@ -145,7 +145,9 @@ Status
 Operations::DoneRequired() const {
     Status status;
     if (!done_) {
-        status = Status(SS_CONSTRAINT_CHECK_ERROR, "Operation is expected to be done");
+        std::stringstream emsg;
+        emsg << GetRepr() << ". Should be done";
+        status = Status(SS_CONSTRAINT_CHECK_ERROR, emsg.str());
     }
     return status;
 }
@@ -153,8 +155,11 @@ Operations::DoneRequired() const {
 Status
 Operations::IDSNotEmptyRequried() const {
     Status status;
-    if (ids_.size() == 0)
-        status = Status(SS_CONSTRAINT_CHECK_ERROR, "No Snapshot is available");
+    if (ids_.size() == 0) {
+        std::stringstream emsg;
+        emsg << GetRepr() << ". No rsource is available";
+        status = Status(SS_CONSTRAINT_CHECK_ERROR, emsg.str());
+    }
     return status;
 }
 
@@ -162,7 +167,9 @@ Status
 Operations::PrevSnapshotRequried() const {
     Status status;
     if (!prev_ss_) {
-        status = Status(SS_CONSTRAINT_CHECK_ERROR, "Prev snapshot is requried");
+        std::stringstream emsg;
+        emsg << GetRepr() << ". Prev snapshot is requried";
+        status = Status(SS_CONSTRAINT_CHECK_ERROR, emsg.str());
     }
     return status;
 }
diff --git a/core/src/db/snapshot/Operations.h b/core/src/db/snapshot/Operations.h
index a2d872d9ac1d81ba8637df7a97b216888514902e..fac6e36d3b762fca456ecd47f7ffda6b101d2c75 100644
--- a/core/src/db/snapshot/Operations.h
+++ b/core/src/db/snapshot/Operations.h
@@ -284,6 +284,51 @@ class LoadOperation : public Operations {
     typename ResourceT::Ptr resource_;
 };
 
+template <typename ResourceT>
+class SoftDeleteOperation : public Operations {
+ public:
+    using BaseT = Operations;
+    explicit SoftDeleteOperation(ID_TYPE id) : BaseT(OperationContext(), ScopedSnapshotT()), id_(id) {
+    }
+
+    Status
+    GetResource(typename ResourceT::Ptr& res, bool wait = false) {
+        if (!status_.ok())
+            return status_;
+        if (wait) {
+            WaitToFinish();
+        }
+        auto status = DoneRequired();
+        if (!status.ok())
+            return status;
+        status = IDSNotEmptyRequried();
+        if (!status.ok())
+            return status;
+        res = resource_;
+        return status;
+    }
+
+    Status
+    DoExecute(Store& store) override {
+        auto status = store.GetResource<ResourceT>(id_, resource_);
+        if (!status.ok()) {
+            return status;
+        }
+        if (!resource_) {
+            std::stringstream emsg;
+            emsg << "Specified " << typeid(ResourceT).name() << " id=" << id_ << " not found";
+            return Status(SS_NOT_FOUND_ERROR, emsg.str());
+        }
+        resource_->Deactivate();
+        AddStep(*resource_, false);
+        return status;
+    }
+
+ protected:
+    ID_TYPE id_;
+    typename ResourceT::Ptr resource_;
+};
+
 template <typename ResourceT>
 class HardDeleteOperation : public Operations {
  public:
diff --git a/core/src/db/snapshot/ResourceOperations.cpp b/core/src/db/snapshot/ResourceOperations.cpp
index d967a4a2c19411d90dbbc33e37afad604452112f..1363ada3a2e5ec1b5917f0463bea674606c161fb 100644
--- a/core/src/db/snapshot/ResourceOperations.cpp
+++ b/core/src/db/snapshot/ResourceOperations.cpp
@@ -19,8 +19,11 @@ namespace snapshot {
 Status
 CollectionCommitOperation::DoExecute(Store& store) {
     auto prev_resource = GetPrevResource();
-    if (!prev_resource)
-        return Status(SS_INVALID_CONTEX_ERROR, "Invalid CollectionCommitOperation Context");
+    if (!prev_resource) {
+        std::stringstream emsg;
+        emsg << GetRepr() << ". Cannot find prev collection commit resource";
+        return Status(SS_INVALID_CONTEX_ERROR, emsg.str());
+    }
     resource_ = std::make_shared<CollectionCommit>(*prev_resource);
     resource_->ResetStatus();
     if (context_.stale_partition_commit) {
@@ -89,7 +92,10 @@ PartitionCommitOperation::DoExecute(Store& store) {
         if (context_.stale_segments.size() > 0) {
             for (auto& stale_segment : context_.stale_segments) {
                 if (stale_segment->GetPartitionId() != prev_resource->GetPartitionId()) {
-                    return Status(SS_INVALID_CONTEX_ERROR, "All stale segments should from specified partition");
+                    std::stringstream emsg;
+                    emsg << GetRepr() << ". All stale segments should from partition ";
+                    emsg << prev_resource->GetPartitionId();
+                    return Status(SS_INVALID_CONTEX_ERROR, emsg.str());
                 }
                 auto stale_segment_commit = GetStartedSS()->GetSegmentCommitBySegmentId(stale_segment->GetID());
                 resource_->GetMappings().erase(stale_segment_commit->GetID());
@@ -97,7 +103,9 @@ PartitionCommitOperation::DoExecute(Store& store) {
         }
     } else {
         if (!context_.new_partition) {
-            return Status(SS_INVALID_CONTEX_ERROR, "Partition is required");
+            std::stringstream emsg;
+            emsg << GetRepr() << ". New partition is required";
+            return Status(SS_INVALID_CONTEX_ERROR, emsg.str());
         }
         resource_ =
             std::make_shared<PartitionCommit>(GetStartedSS()->GetCollectionId(), context_.new_partition->GetID());
@@ -127,15 +135,20 @@ SegmentOperation::SegmentOperation(const OperationContext& context, ScopedSnapsh
 
 Status
 SegmentOperation::PreCheck() {
-    if (!context_.prev_partition)
-        return Status(SS_INVALID_CONTEX_ERROR, "Invalid SegmentOperation Context");
+    if (!context_.prev_partition) {
+        std::stringstream emsg;
+        emsg << GetRepr() << ". prev_partition should be specified in context";
+        return Status(SS_INVALID_CONTEX_ERROR, emsg.str());
+    }
     return Status::OK();
 }
 
 Status
 SegmentOperation::DoExecute(Store& store) {
     if (!context_.prev_partition) {
-        return Status(SS_INVALID_CONTEX_ERROR, "Invalid SegmentOperation Context");
+        std::stringstream emsg;
+        emsg << GetRepr() << ". prev_partition should be specified in context";
+        return Status(SS_INVALID_CONTEX_ERROR, emsg.str());
     }
     auto prev_num = GetStartedSS()->GetMaxSegmentNumByPartition(context_.prev_partition->GetID());
     resource_ = std::make_shared<Segment>(context_.prev_partition->GetID(), prev_num + 1);
@@ -169,7 +182,9 @@ SegmentCommitOperation::DoExecute(Store& store) {
 Status
 SegmentCommitOperation::PreCheck() {
     if (context_.new_segment_files.size() == 0) {
-        return Status(SS_INVALID_CONTEX_ERROR, "Invalid SegmentCommitOperation Context");
+        std::stringstream emsg;
+        emsg << GetRepr() << ". new_segment_files should not be empty in context";
+        return Status(SS_INVALID_CONTEX_ERROR, emsg.str());
     }
     return Status::OK();
 }
diff --git a/core/src/db/snapshot/SnapshotHolder.cpp b/core/src/db/snapshot/SnapshotHolder.cpp
index f012e0ec688b696bdc6e6ad842f9c58c3ea8374f..fa2182e0eb53b5ec70b1010abd4725acc5e56663 100644
--- a/core/src/db/snapshot/SnapshotHolder.cpp
+++ b/core/src/db/snapshot/SnapshotHolder.cpp
@@ -55,12 +55,20 @@ SnapshotHolder::Load(Store& store, ScopedSnapshotT& ss, ID_TYPE id, bool scoped)
         return status;
     }
     if (id < min_id_) {
-        return Status(SS_STALE_ERROR, "Get stale snapshot");
+        std::stringstream emsg;
+        emsg << "SnapshotHolder::Load: Got stale snapshot " << id;
+        emsg << " current is " << max_id_;
+        emsg << " on collection " << collection_id_;
+        return Status(SS_STALE_ERROR, emsg.str());
     }
 
     auto it = active_.find(id);
     if (it == active_.end()) {
-        return Status(SS_NOT_FOUND_ERROR, "Specified Snapshot not found");
+        std::stringstream emsg;
+        emsg << "SnapshotHolder::Load: Specified snapshot " << id << " not found.";
+        emsg << " Current is " << max_id_;
+        emsg << " on collection " << collection_id_;
+        return Status(SS_NOT_FOUND_ERROR, emsg.str());
     }
     ss = ScopedSnapshotT(it->second, scoped);
     return status;
@@ -70,7 +78,11 @@ Status
 SnapshotHolder::Get(ScopedSnapshotT& ss, ID_TYPE id, bool scoped) {
     Status status;
     if (id > max_id_) {
-        return Status(SS_NOT_FOUND_ERROR, "Specified Snapshot not found");
+        std::stringstream emsg;
+        emsg << "SnapshotHolder::Get: Specified snapshot " << id << " not found.";
+        emsg << " Current is " << max_id_;
+        emsg << " on collection " << collection_id_;
+        return Status(SS_NOT_FOUND_ERROR, emsg.str());
     }
 
     std::unique_lock<std::mutex> lock(mutex_);
@@ -80,12 +92,20 @@ SnapshotHolder::Get(ScopedSnapshotT& ss, ID_TYPE id, bool scoped) {
         return status;
     }
     if (id < min_id_) {
-        return Status(SS_STALE_ERROR, "Get stale snapshot");
+        std::stringstream emsg;
+        emsg << "SnapshotHolder::Get: Got stale snapshot " << id;
+        emsg << " current is " << max_id_;
+        emsg << " on collection " << collection_id_;
+        return Status(SS_STALE_ERROR, emsg.str());
     }
 
     auto it = active_.find(id);
     if (it == active_.end()) {
-        return Status(SS_NOT_FOUND_ERROR, "Specified Snapshot not found");
+        std::stringstream emsg;
+        emsg << "SnapshotHolder::Get: Specified snapshot " << id << " not found.";
+        emsg << " Current is " << max_id_;
+        emsg << " on collection " << collection_id_;
+        return Status(SS_NOT_FOUND_ERROR, emsg.str());
     }
     ss = ScopedSnapshotT(it->second, scoped);
     return status;
@@ -106,11 +126,16 @@ SnapshotHolder::Add(ID_TYPE id) {
     {
         std::unique_lock<std::mutex> lock(mutex_);
         if (active_.size() > 0 && id < max_id_) {
-            return Status(SS_INVALID_ARGUMENT_ERROR, "Invalid ID");
+            std::stringstream emsg;
+            emsg << "SnapshotHolder::Add: Invalid snapshot " << id << ".";
+            emsg << " Should larger than " << max_id_;
+            return Status(SS_INVALID_ARGUMENT_ERROR, emsg.str());
         }
         auto it = active_.find(id);
         if (it != active_.end()) {
-            return Status(SS_DUPLICATED_ERROR, "Duplicated ID");
+            std::stringstream emsg;
+            emsg << "SnapshotHolder::Add: Duplicated snapshot " << id << ".";
+            return Status(SS_DUPLICATED_ERROR, emsg.str());
         }
     }
     Snapshot::Ptr oldest_ss;
@@ -119,7 +144,9 @@ SnapshotHolder::Add(ID_TYPE id) {
 
         std::unique_lock<std::mutex> lock(mutex_);
         if (!IsActive(ss)) {
-            return Status(SS_NOT_ACTIVE_ERROR, "Specified collection is not active now");
+            std::stringstream emsg;
+            emsg << "SnapshotHolder::Add: Specified collection " << collection_id_;
+            return Status(SS_NOT_ACTIVE_ERROR, emsg.str());
         }
         ss->RegisterOnNoRefCB(std::bind(&Snapshot::UnRefAll, ss));
         ss->Ref();
diff --git a/core/src/db/snapshot/Snapshots.cpp b/core/src/db/snapshot/Snapshots.cpp
index 7f559e3abe8018c0119170b0da2c0c85ab9e6108..c177924a6c9dec1d9d5827be9ad65999e51aa24a 100644
--- a/core/src/db/snapshot/Snapshots.cpp
+++ b/core/src/db/snapshot/Snapshots.cpp
@@ -121,7 +121,9 @@ Snapshots::LoadNoLock(Store& store, ID_TYPE collection_id, SnapshotHolderPtr& ho
     (*op)(store);
     auto& collection_commit_ids = op->GetIDs();
     if (collection_commit_ids.size() == 0) {
-        return Status(SS_NOT_FOUND_ERROR, "No collection commit found");
+        std::stringstream emsg;
+        emsg << "Snapshots::LoadNoLock: No collection commit is found for collection " << collection_id;
+        return Status(SS_NOT_FOUND_ERROR, emsg.str());
     }
     holder = std::make_shared<SnapshotHolder>(collection_id,
                                               std::bind(&Snapshots::SnapshotGCCallback, this, std::placeholders::_1));
@@ -153,7 +155,11 @@ Snapshots::GetHolder(const std::string& name, SnapshotHolderPtr& holder) {
         lock.unlock();
         return GetHolder(kv->second, holder);
     }
-    return Status(SS_NOT_FOUND_ERROR, "Specified snapshot holder not found");
+    std::stringstream emsg;
+    emsg << "Snapshots::GetHolderNoLock: Specified snapshot holder for collection ";
+    emsg << "\"" << name << "\""
+         << " not found";
+    return Status(SS_NOT_FOUND_ERROR, emsg.str());
 }
 
 Status
@@ -192,7 +198,10 @@ Status
 Snapshots::GetHolderNoLock(ID_TYPE collection_id, SnapshotHolderPtr& holder) {
     auto it = holders_.find(collection_id);
     if (it == holders_.end()) {
-        return Status(SS_NOT_FOUND_ERROR, "Specified snapshot holder not found");
+        std::stringstream emsg;
+        emsg << "Snapshots::GetHolderNoLock: Specified snapshot holder for collection " << collection_id;
+        emsg << " not found";
+        return Status(SS_NOT_FOUND_ERROR, emsg.str());
     }
     holder = it->second;
     return Status::OK();
diff --git a/core/unittest/db/test_snapshot.cpp b/core/unittest/db/test_snapshot.cpp
index f1080e5a14819b6138b326520db43ae954e1ad70..e4f67fb2d396759f7df98ca03389740ea647641a 100644
--- a/core/unittest/db/test_snapshot.cpp
+++ b/core/unittest/db/test_snapshot.cpp
@@ -34,6 +34,7 @@ using ID_TYPE = milvus::engine::snapshot::ID_TYPE;
 using IDS_TYPE = milvus::engine::snapshot::IDS_TYPE;
 using LSN_TYPE = milvus::engine::snapshot::LSN_TYPE;
 using MappingT = milvus::engine::snapshot::MappingT;
+using LoadOperationContext = milvus::engine::snapshot::LoadOperationContext;
 using CreateCollectionContext = milvus::engine::snapshot::CreateCollectionContext;
 using SegmentFileContext = milvus::engine::snapshot::SegmentFileContext;
 using OperationContext = milvus::engine::snapshot::OperationContext;
@@ -63,6 +64,7 @@ using ScopedSnapshotT = milvus::engine::snapshot::ScopedSnapshotT;
 using ReferenceProxy = milvus::engine::snapshot::ReferenceProxy;
 using Queue = milvus::BlockingQueue<ID_TYPE>;
 using TQueue = milvus::BlockingQueue<std::tuple<ID_TYPE, ID_TYPE>>;
+using SoftDeleteCollectionOperation = milvus::engine::snapshot::SoftDeleteOperation<Collection>;
 
 int RandomInt(int start, int end) {
     std::random_device dev;
@@ -197,6 +199,70 @@ CreateCollection(const std::string& collection_name, const LSN_TYPE& lsn) {
     return ss;
 }
 
+TEST_F(SnapshotTest, DeleteOperationTest) {
+    std::string collection_name = "test_c1";
+    LSN_TYPE lsn = 1;
+    auto ss = CreateCollection(collection_name, lsn);
+    ASSERT_TRUE(ss);
+
+    auto collection = CollectionsHolder::GetInstance().GetResource(ss->GetCollectionId());
+    ASSERT_EQ(collection->GetName(), collection_name);
+
+    {
+        auto soft_op = std::make_shared<SoftDeleteCollectionOperation>(collection->GetID());
+        auto status = soft_op->Push();
+        ASSERT_TRUE(status.ok());
+        CollectionPtr soft_deleted;
+        status = soft_op->GetResource(soft_deleted);
+        ASSERT_TRUE(status.ok());
+        ASSERT_TRUE(soft_deleted);
+        ASSERT_EQ(soft_deleted->GetID(), collection->GetID());
+        ASSERT_TRUE(soft_deleted->IsDeactive());
+    }
+
+    {
+        CollectionPtr loaded;
+        LoadOperationContext context;
+        context.id = collection->GetID();
+        auto load_op = std::make_shared<milvus::engine::snapshot::LoadOperation<Collection>>(context);
+        auto status = load_op->Push();
+        ASSERT_TRUE(status.ok());
+        status = load_op->GetResource(loaded);
+        ASSERT_TRUE(status.ok());
+        ASSERT_TRUE(loaded);
+        ASSERT_EQ(loaded->GetID(), collection->GetID());
+        ASSERT_TRUE(loaded->IsDeactive());
+    }
+
+    {
+        auto hard_op = std::make_shared<milvus::engine::snapshot::HardDeleteOperation<Collection>
+            >(collection->GetID());
+        auto status = hard_op->Push();
+        ASSERT_TRUE(status.ok());
+    }
+
+    {
+        CollectionPtr loaded;
+        LoadOperationContext context;
+        context.id = collection->GetID();
+        auto load_op = std::make_shared<milvus::engine::snapshot::LoadOperation<Collection>>(context);
+        auto status = load_op->Push();
+        if (!status.ok()) {
+            std::cout << status.ToString() << std::endl;
+        }
+        ASSERT_FALSE(status.ok());
+    }
+
+    {
+        auto soft_op = std::make_shared<SoftDeleteCollectionOperation>(collection->GetID());
+        auto status = soft_op->Push();
+        if (!status.ok()) {
+            std::cout << status.ToString() << std::endl;
+        }
+        ASSERT_FALSE(status.ok());
+    }
+}
+
 TEST_F(SnapshotTest, CreateCollectionOperationTest) {
     ScopedSnapshotT expect_null;
     auto status = Snapshots::GetInstance().GetSnapshot(expect_null, 100000);