diff --git a/ucm/store/pcstore/cc/domain/trans/trans_manager.cc b/ucm/store/pcstore/cc/domain/trans/trans_manager.cc
index aeb30543..63ee887b 100644
--- a/ucm/store/pcstore/cc/domain/trans/trans_manager.cc
+++ b/ucm/store/pcstore/cc/domain/trans/trans_manager.cc
@@ -94,6 +94,8 @@ Status TransManager::Wait(const size_t taskId) noexcept
         UC_ERROR("Task({}) timeout({}).", task->Str(), timeoutMs_);
         failureSet_.Insert(taskId);
         waiter->Wait();
+        failureSet_.Remove(taskId);
+        return Status::Timeout();
     }
     auto failure = failureSet_.Contains(taskId);
     if (failure) {
diff --git a/ucm/store/pcstore/cpy/pcstore.py.cc b/ucm/store/pcstore/cpy/pcstore.py.cc
index cadb1ebe..834f08a7 100644
--- a/ucm/store/pcstore/cpy/pcstore.py.cc
+++ b/ucm/store/pcstore/cpy/pcstore.py.cc
@@ -24,25 +24,61 @@
 #include "pcstore.h"
 #include <pybind11/pybind11.h>
 #include <pybind11/stl.h>
+#include "status/status.h"
+#include "thread/latch.h"
+#include "thread/thread_pool.h"
 
 namespace py = pybind11;
 
 namespace UC {
 
 class PcStorePy : public PcStore {
+    using LookupCtx = std::pair<std::string, uint8_t*>;
+    ThreadPool<LookupCtx> lookupService_;
+    Latch lookupWaiter_;
+    std::atomic<int32_t> lookupStatus_;
+    std::mutex lookupMtx_;
+
 public:
     void* CCStoreImpl() { return this; }
+    int32_t SetupPy(const Config& config)
+    {
+        auto ret = Setup(config);
+        if (config.transferEnable || ret != Status::OK().Underlying()) { return ret; }
+        auto success =
+            lookupService_.SetNWorker(4)
+                .SetWorkerFn([this](auto& pair, auto) { OnLookup(pair.first, pair.second); })
+                .SetWorkerTimeoutFn([this](auto&, auto) { OnLookupTimeouted(); }, 10000)
+                .Run();
+        if (!success) {
+            UC_ERROR("Failed to start lookup service.");
+            return Status::Error().Underlying();
+        }
+        return Status::OK().Underlying();
+    }
     py::list AllocBatch(const py::list& blocks)
     {
         py::list results;
         for (auto& block : blocks) { results.append(this->Alloc(block.cast<std::string>())); }
         return results;
     }
-    py::list LookupBatch(const py::list& blocks)
+    std::vector<uint8_t> LookupBatch(const py::list& blocks)
     {
-        py::list founds;
-        for (auto& block : blocks) { founds.append(this->Lookup(block.cast<std::string>())); }
-        return founds;
+        std::lock_guard lock{lookupMtx_};
+        const auto number = blocks.size();
+        const auto ok = Status::OK().Underlying();
+        lookupStatus_ = ok;
+        lookupWaiter_.Set(number);
+        std::vector<uint8_t> founds(number);
+        size_t idx = 0;
+        for (auto& block : blocks) {
+            lookupService_.Push({block.cast<std::string>(), founds.data() + idx});
+            idx++;
+        }
+        lookupWaiter_.Wait();
+        const auto ret = lookupStatus_.load();
+        if (ret == ok) { return founds; }
+        throw std::runtime_error{fmt::format("error({}) when performing LookupBatch", ret)};
     }
     void CommitBatch(const py::list& blocks, const bool success)
     {
@@ -77,9 +113,22 @@ class PcStorePy : public PcStore {
         }
         return this->Submit(std::move(task));
     }
+    void OnLookup(const std::string& block, uint8_t* found)
+    {
+        const auto ok = Status::OK().Underlying();
+        if (lookupStatus_ == ok) { *found = Lookup(block); }
+        lookupWaiter_.Done();
+    }
+    void OnLookupTimeouted()
+    {
+        auto ok = Status::OK().Underlying();
+        auto timeout = Status::Timeout().Underlying();
+        lookupStatus_.compare_exchange_weak(ok, timeout, std::memory_order_acq_rel);
+        lookupWaiter_.Done();
+    }
 };
 
-} // namespace UC
+}  // namespace UC
 
 PYBIND11_MODULE(ucmpcstore, module)
 {
@@ -106,7 +155,7 @@ PYBIND11_MODULE(ucmpcstore, module)
                          &UC::PcStorePy::Config::transferScatterGatherEnable);
     store.def(py::init<>());
     store.def("CCStoreImpl", &UC::PcStorePy::CCStoreImpl);
-    store.def("Setup", &UC::PcStorePy::Setup);
+    store.def("Setup", &UC::PcStorePy::SetupPy);
     store.def("Alloc", py::overload_cast<const std::string&>(&UC::PcStorePy::Alloc));
     store.def("AllocBatch", &UC::PcStorePy::AllocBatch);
     store.def("Lookup", py::overload_cast<const std::string&>(&UC::PcStorePy::Lookup));
diff --git a/ucm/store/test/e2e/pcstore_embed_v1.py b/ucm/store/test/e2e/pcstore_embed_v1.py
index 68e5ffdc..edd4512d 100644
--- a/ucm/store/test/e2e/pcstore_embed_v1.py
+++ b/ucm/store/test/e2e/pcstore_embed_v1.py
@@ -37,7 +37,7 @@ def setup_store(storage_backends, block_size, device_id, io_size) -> UcmKVStoreB
     config = {}
     config["storage_backends"] = storage_backends
     config["kv_block_size"] = block_size
-    config["role"] = "worker"
+    config["role"] = "worker" if device_id != -1 else "scheduler"
     config["device"] = device_id
     config["io_size"] = io_size
     config["unique_id"] = secrets.token_hex(8)
@@ -63,22 +63,29 @@ def make_buffers(
 
 
 def embed(
-    store: UcmKVStoreBaseV1, hashes: List[bytes], tensors: List[List[torch.Tensor]]
+    worker: UcmKVStoreBaseV1, hashes: List[bytes], tensors: List[List[torch.Tensor]]
 ):
-    task = store.dump(hashes, [], tensors)
+    task = worker.dump(hashes, [], tensors)
     assert task.task_id > 0
-    store.wait(task)
+    worker.wait(task)
 
 
 def fetch(
-    store: UcmKVStoreBaseV1, hashes: List[bytes], tensors: List[List[torch.Tensor]]
+    scheduler: UcmKVStoreBaseV1,
+    worker: UcmKVStoreBaseV1,
+    hashes: List[bytes],
+    tensors: List[List[torch.Tensor]],
 ):
-    founds = store.lookup(hashes)
+    number = len(hashes)
+    tp = time.perf_counter()
+    founds = scheduler.lookup(hashes)
+    cost = time.perf_counter() - tp
+    print(f"Lookup {number} blocks cost {cost * 1e3:.03f}ms.")
     for found in founds:
         assert found
-    task = store.load(hashes, [], tensors)
+    task = worker.load(hashes, [], tensors)
     assert task.task_id > 0
-    store.wait(task)
+    worker.wait(task)
 
 
 def cmp_and_print_diff(a, b, rtol=0.0, atol=0.0):
@@ -104,8 +111,9 @@ def main():
     block_layer = 61
     io_size = block_dim * block_len * block_elem_size
     block_size = io_size * block_layer
-    batch_size = 64
-    store = setup_store(storage_backends, block_size, device_id, io_size)
+    batch_size = 256
+    worker = setup_store(storage_backends, block_size, device_id, io_size)
+    scheduler = setup_store(storage_backends, block_size, -1, io_size)
     hashes, tensors = make_buffers(
         block_number, device_id, batch_size, block_dim, block_len, block_layer
     )
@@ -114,9 +122,9 @@ def main():
         start = batch_size * batch
         end = min(start + batch_size, block_number)
         tensors2 = [[torch.empty_like(t) for t in row] for row in tensors]
-        embed(store, hashes[start:end], tensors)
+        embed(worker, hashes[start:end], tensors)
         time.sleep(1)
-        fetch(store, hashes[start:end], tensors2)
+        fetch(scheduler, worker, hashes[start:end], tensors2)
         cmp_and_print_diff(tensors, tensors2)