diff --git a/cpp/src/db/DBImpl.cpp b/cpp/src/db/DBImpl.cpp
index a763c9199c..ed1318ef1d 100644
--- a/cpp/src/db/DBImpl.cpp
+++ b/cpp/src/db/DBImpl.cpp
@@ -77,7 +77,7 @@ Status DBImpl::Start() {
     shutting_down_.store(false, std::memory_order_release);
 
     //for distribute version, some nodes are read only
-    if (options_.mode_ != DBOptions::MODE::READ_ONLY) {
+    if (options_.mode_ != DBOptions::MODE::CLUSTER_READONLY) {
         ENGINE_LOG_TRACE << "StartTimerTasks";
         bg_timer_thread_ = std::thread(&DBImpl::BackgroundTimerTask, this);
     }
@@ -98,7 +98,7 @@ Status DBImpl::Stop() {
     //wait compaction/buildindex finish
     bg_timer_thread_.join();
 
-    if (options_.mode_ != DBOptions::MODE::READ_ONLY) {
+    if (options_.mode_ != DBOptions::MODE::CLUSTER_READONLY) {
         meta_ptr_->CleanUp();
     }
 
@@ -684,7 +684,7 @@ void DBImpl::BackgroundCompaction(std::set<std::string> table_ids) {
     meta_ptr_->Archive();
 
     int ttl = 5*meta::M_SEC;//default: file will be deleted after 5 minutes
-    if (options_.mode_ == DBOptions::MODE::CLUSTER) {
+    if (options_.mode_ == DBOptions::MODE::CLUSTER_WRITABLE) {
         ttl = meta::D_SEC;
     }
     meta_ptr_->CleanUpFilesWithTTL(ttl);
diff --git a/cpp/src/db/Options.h b/cpp/src/db/Options.h
index 2ba8c36a32..dbaf34b065 100644
--- a/cpp/src/db/Options.h
+++ b/cpp/src/db/Options.h
@@ -60,9 +60,9 @@ struct DBMetaOptions {
 
 struct DBOptions {
     typedef enum {
-        SINGLE,
-        CLUSTER,
-        READ_ONLY
+        SINGLE = 0,
+        CLUSTER_READONLY,
+        CLUSTER_WRITABLE
     } MODE;
 
     uint16_t  merge_trigger_number_ = 2;
diff --git a/cpp/src/db/meta/MySQLMetaImpl.cpp b/cpp/src/db/meta/MySQLMetaImpl.cpp
index 3e54686ed0..5a5470008d 100644
--- a/cpp/src/db/meta/MySQLMetaImpl.cpp
+++ b/cpp/src/db/meta/MySQLMetaImpl.cpp
@@ -284,7 +284,7 @@ Status MySQLMetaImpl::Initialize() {
     //step 5: create meta tables
     try {
 
-        if (mode_ != DBOptions::MODE::READ_ONLY) {
+        if (mode_ != DBOptions::MODE::CLUSTER_READONLY) {
             CleanUp();
         }
 
@@ -758,7 +758,7 @@ Status MySQLMetaImpl::DeleteTable(const std::string &table_id) {
 
         } //Scoped Connection
 
-        if (mode_ == DBOptions::MODE::CLUSTER) {
+        if (mode_ == DBOptions::MODE::CLUSTER_WRITABLE) {
             DeleteTableFiles(table_id);
         }
 
diff --git a/cpp/src/server/Config.cpp b/cpp/src/server/Config.cpp
index 3730ff6f68..31dc5fe1a9 100644
--- a/cpp/src/server/Config.cpp
+++ b/cpp/src/server/Config.cpp
@@ -84,7 +84,7 @@ Config::ValidateConfig() {
     if (!s.ok()) return s;
 
     std::string server_mode;
-    s = GetServerConfigMode(server_mode);
+    s = GetServerConfigDeployMode(server_mode);
     if (!s.ok()) return s;
 
     std::string server_time_zone;
@@ -219,7 +219,7 @@ Config::CheckServerConfigPort(const std::string &value) {
 }
 
 Status
-Config::CheckServerConfigMode(const std::string &value) {
+Config::CheckServerConfigDeployMode(const std::string &value) {
     if (value != "single" &&
         value != "cluster_readonly" &&
         value != "cluster_writable") {
@@ -511,12 +511,12 @@ Config::GetServerConfigStrPort() {
 }
 
 std::string
-Config::GetServerConfigStrMode() {
+Config::GetServerConfigStrDeployMode() {
     std::string value;
-    if (!GetConfigValueInMem(CONFIG_SERVER, CONFIG_SERVER_MODE, value).ok()) {
-        value = GetConfigNode(CONFIG_SERVER).GetValue(CONFIG_SERVER_MODE,
-                                                      CONFIG_SERVER_MODE_DEFAULT);
-        SetConfigValueInMem(CONFIG_SERVER, CONFIG_SERVER_MODE, value);
+    if (!GetConfigValueInMem(CONFIG_SERVER, CONFIG_SERVER_DEPLOY_MODE, value).ok()) {
+        value = GetConfigNode(CONFIG_SERVER).GetValue(CONFIG_SERVER_DEPLOY_MODE,
+                                                      CONFIG_SERVER_DEPLOY_MODE_DEFAULT);
+        SetConfigValueInMem(CONFIG_SERVER, CONFIG_SERVER_DEPLOY_MODE, value);
     }
     return value;
 }
@@ -755,9 +755,9 @@ Config::GetServerConfigPort(std::string& value) {
 }
 
 Status
-Config::GetServerConfigMode(std::string& value) {
-    value = GetServerConfigStrMode();
-    return CheckServerConfigMode(value);
+Config::GetServerConfigDeployMode(std::string& value) {
+    value = GetServerConfigStrDeployMode();
+    return CheckServerConfigDeployMode(value);
 }
 
 Status
@@ -938,10 +938,10 @@ Config::SetServerConfigPort(const std::string& value) {
 }
 
 Status
-Config::SetServerConfigMode(const std::string& value) {
-    Status s = CheckServerConfigMode(value);
+Config::SetServerConfigDeployMode(const std::string& value) {
+    Status s = CheckServerConfigDeployMode(value);
     if (!s.ok()) return s;
-    SetConfigValueInMem(CONFIG_SERVER, CONFIG_SERVER_MODE, value);
+    SetConfigValueInMem(CONFIG_SERVER, CONFIG_SERVER_DEPLOY_MODE, value);
     return Status::OK();
 }
 
diff --git a/cpp/src/server/Config.h b/cpp/src/server/Config.h
index 710230eb0a..422632a01f 100644
--- a/cpp/src/server/Config.h
+++ b/cpp/src/server/Config.h
@@ -34,8 +34,8 @@ static const char* CONFIG_SERVER_ADDRESS = "address";
 static const char* CONFIG_SERVER_ADDRESS_DEFAULT = "127.0.0.1";
 static const char* CONFIG_SERVER_PORT = "port";
 static const char* CONFIG_SERVER_PORT_DEFAULT = "19530";
-static const char* CONFIG_SERVER_MODE = "mode";
-static const char* CONFIG_SERVER_MODE_DEFAULT = "single";
+static const char* CONFIG_SERVER_DEPLOY_MODE = "deploy_mode";
+static const char* CONFIG_SERVER_DEPLOY_MODE_DEFAULT = "single";
 static const char* CONFIG_SERVER_TIME_ZONE = "time_zone";
 static const char* CONFIG_SERVER_TIME_ZONE_DEFAULT = "UTC+8";
 
@@ -117,7 +117,7 @@ class Config {
     /* server config */
     Status CheckServerConfigAddress(const std::string& value);
     Status CheckServerConfigPort(const std::string& value);
-    Status CheckServerConfigMode(const std::string& value);
+    Status CheckServerConfigDeployMode(const std::string& value);
     Status CheckServerConfigTimeZone(const std::string& value);
 
     /* db config */
@@ -153,7 +153,7 @@ class Config {
     /* server config */
     std::string GetServerConfigStrAddress();
     std::string GetServerConfigStrPort();
-    std::string GetServerConfigStrMode();
+    std::string GetServerConfigStrDeployMode();
     std::string GetServerConfigStrTimeZone();
 
     /* db config */
@@ -188,7 +188,7 @@ class Config {
     /* server config */
     Status GetServerConfigAddress(std::string& value);
     Status GetServerConfigPort(std::string& value);
-    Status GetServerConfigMode(std::string& value);
+    Status GetServerConfigDeployMode(std::string& value);
     Status GetServerConfigTimeZone(std::string& value);
 
     /* db config */
@@ -224,7 +224,7 @@ class Config {
     /* server config */
     Status SetServerConfigAddress(const std::string& value);
     Status SetServerConfigPort(const std::string& value);
-    Status SetServerConfigMode(const std::string& value);
+    Status SetServerConfigDeployMode(const std::string& value);
     Status SetServerConfigTimeZone(const std::string& value);
 
     /* db config */
diff --git a/cpp/src/server/DBWrapper.cpp b/cpp/src/server/DBWrapper.cpp
index 745965dc6a..49c4cac8c8 100644
--- a/cpp/src/server/DBWrapper.cpp
+++ b/cpp/src/server/DBWrapper.cpp
@@ -60,20 +60,20 @@ Status DBWrapper::StartService() {
     if (!s.ok()) return s;
 
     std::string mode;
-    s = config.GetServerConfigMode(mode);
+    s = config.GetServerConfigDeployMode(mode);
     if (!s.ok()) return s;
 
     if (mode == "single") {
         opt.mode_ = engine::DBOptions::MODE::SINGLE;
     }
-    else if (mode == "cluster") {
-        opt.mode_ = engine::DBOptions::MODE::CLUSTER;
+    else if (mode == "cluster_readonly") {
+        opt.mode_ = engine::DBOptions::MODE::CLUSTER_READONLY;
     }
-    else if (mode == "read_only") {
-        opt.mode_ = engine::DBOptions::MODE::READ_ONLY;
+    else if (mode == "cluster_writable") {
+        opt.mode_ = engine::DBOptions::MODE::CLUSTER_WRITABLE;
     }
     else {
-        std::cerr << "ERROR: mode specified in server_config is not one of ['single', 'cluster', 'read_only']" << std::endl;
+        std::cerr << "ERROR: mode specified in server_config must be ['single', 'cluster_readonly', 'cluster_writable']" << std::endl;
         kill(0, SIGUSR1);
     }