diff --git a/mindspore/ccsrc/dataset/engine/cache/cache_service.cc b/mindspore/ccsrc/dataset/engine/cache/cache_service.cc
index 1cbe3fdb4e1..555413a5662 100644
--- a/mindspore/ccsrc/dataset/engine/cache/cache_service.cc
+++ b/mindspore/ccsrc/dataset/engine/cache/cache_service.cc
@@ -105,7 +105,7 @@ Status CacheService::CacheRow(const std::vector<const void *> &buf, row_id_type
     RETURN_IF_NOT_OK(cp_->Insert(all_data, &key));
     Status rc = map_->DoInsert(*row_id_generated, key);
     if (rc == Status(StatusCode::kDuplicateKey)) {
-      MS_LOG(DEBUG) << "Ignoring duplicate key";
+      MS_LOG(DEBUG) << "Ignoring duplicate key.";
     } else {
       RETURN_IF_NOT_OK(rc);
     }
diff --git a/mindspore/ccsrc/dataset/engine/datasetops/cache_base_op.cc b/mindspore/ccsrc/dataset/engine/datasetops/cache_base_op.cc
index 42d3f0fee3d..c943f8bd7ab 100644
--- a/mindspore/ccsrc/dataset/engine/datasetops/cache_base_op.cc
+++ b/mindspore/ccsrc/dataset/engine/datasetops/cache_base_op.cc
@@ -53,7 +53,7 @@ CacheBase::CacheBase(int32_t num_workers, int32_t op_connector_size, int32_t row
       cache_client_(cache_client),
       rows_per_buffer_(rows_per_buf),
       // We can cause deadlock if this internal Connector size is too small.
-      keys_miss_(num_workers_, 1, 1024) {
+      keys_miss_(num_workers_, 1, connector_capacity_) {
   io_block_queues_.Init(num_workers, op_connector_size);
 }
 // Common function to fetch samples from the sampler and send them using the io_block_queues to
diff --git a/mindspore/ccsrc/dataset/engine/datasetops/cache_base_op.h b/mindspore/ccsrc/dataset/engine/datasetops/cache_base_op.h
index a6a98fc4ad8..9f90b7cd9d1 100644
--- a/mindspore/ccsrc/dataset/engine/datasetops/cache_base_op.h
+++ b/mindspore/ccsrc/dataset/engine/datasetops/cache_base_op.h
@@ -48,8 +48,6 @@ class CacheBase : public ParallelOp {
   /// \brief Destructor
   ~CacheBase();
 
-  constexpr static int eoe_row_id = -1;
-
   /// \brief Overrides base class reset method.  When an operator does a reset, it cleans up any state
   /// info from it's previous execution and then initializes itself so that it can be executed
   /// again.
@@ -80,6 +78,7 @@ class CacheBase : public ParallelOp {
   virtual bool AllowCacheMiss() = 0;
 
  protected:
+  constexpr static int32_t eoe_row_id = -1;
   std::shared_ptr<CacheClient> cache_client_;
   WaitPost epoch_sync_;
   int32_t rows_per_buffer_;
@@ -100,6 +99,7 @@ class CacheBase : public ParallelOp {
   Status UpdateColumnMapFromCache();
 
  private:
+  constexpr static int32_t connector_capacity_ = 1024;
   QueueList<std::unique_ptr<IOBlock>> io_block_queues_;
 };
 }  // namespace dataset
diff --git a/mindspore/ccsrc/dataset/engine/datasetops/cache_merge_op.cc b/mindspore/ccsrc/dataset/engine/datasetops/cache_merge_op.cc
index 5d00ec071f2..f2d5173348d 100644
--- a/mindspore/ccsrc/dataset/engine/datasetops/cache_merge_op.cc
+++ b/mindspore/ccsrc/dataset/engine/datasetops/cache_merge_op.cc
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#include "dataset/engine/datasetops/cache_merge_op.h"
 
 #include <algorithm>
 #include <functional>
@@ -20,7 +21,6 @@
 #include "dataset/core/config_manager.h"
 #include "dataset/core/constants.h"
 #include "dataset/core/global_context.h"
-#include "dataset/engine/datasetops/cache_merge_op.h"
 #include "dataset/engine/opt/pass.h"
 #include "dataset/engine/execution_tree.h"
 #include "dataset/util/task_manager.h"
@@ -50,7 +50,8 @@ Status CacheMergeOp::operator()() {
   // A queue of row id to let cleaner send cache miss rows to the cache server
   // We don't want a small queue as this will block the parallel op workers.
   // A row id is 8 byte integer. So bigger size doesn't consume a lot of memory.
-  io_que_ = std::make_unique<Queue<row_id_type>>(512);
+  static const int32_t queue_sz = 512;
+  io_que_ = std::make_unique<Queue<row_id_type>>(queue_sz);
   RETURN_IF_NOT_OK(io_que_->Register(tree_->AllTasks()));
   RETURN_IF_NOT_OK(
     tree_->LaunchWorkers(num_workers_, std::bind(&CacheMergeOp::WorkerEntry, this, std::placeholders::_1)));
@@ -151,7 +152,7 @@ Status CacheMergeOp::Cleaner() {
     }
     TensorRow row;
     RETURN_IF_NOT_OK(rq->Release(&row));
-    CHECK_FAIL_RETURN_UNEXPECTED(!row.empty(), "Programming error");
+    CHECK_FAIL_RETURN_UNEXPECTED(!row.empty(), "Programming error.");
     Status rc = cache_client_->WriteRow(row);
     // Bad rc should not bring down the pipeline
     if (rc.IsError()) {