diff --git a/bin/dsn.cmake b/bin/dsn.cmake
index 66085c4a5f..6186b13943 100644
--- a/bin/dsn.cmake
+++ b/bin/dsn.cmake
@@ -1,5 +1,10 @@
 include(${CMAKE_CURRENT_LIST_DIR}/compiler_info.cmake)
 
+# Always generate the compilation database file (compile_commands.json) for use
+# with various development tools, such as IWYU and Vim's YouCompleteMe plugin.
+# See http://clang.llvm.org/docs/JSONCompilationDatabase.html
+set(CMAKE_EXPORT_COMPILE_COMMANDS TRUE)
+
 function(ms_add_project PROJ_LANG PROJ_TYPE PROJ_NAME PROJ_SRC PROJ_INC_PATH PROJ_LIBS PROJ_LIB_PATH PROJ_BINPLACES PROJ_BINDIRS DO_INSTALL)
     if(DEFINED DSN_DEBUG_CMAKE)
         message(STATUS "PROJ_LANG = ${PROJ_LANG}")
diff --git a/include/dsn/dist/replication/replication_ddl_client.h b/include/dsn/dist/replication/replication_ddl_client.h
index 5d29b5ea6b..c1d0a33f1b 100644
--- a/include/dsn/dist/replication/replication_ddl_client.h
+++ b/include/dsn/dist/replication/replication_ddl_client.h
@@ -79,6 +79,8 @@ class replication_ddl_client
     list_nodes(const dsn::replication::node_status::type status,
                std::map<dsn::rpc_address, dsn::replication::node_status::type> &nodes);
 
+    dsn::error_code cluster_name(int64_t timeout_ms, std::string &cluster_name);
+
     dsn::error_code cluster_info(const std::string &file_name, bool resolve_ip = false);
 
     dsn::error_code list_app(const std::string &app_name,
diff --git a/src/core/tests/string_conv_test.cpp b/src/core/tests/string_conv_test.cpp
index 9196d7e91c..e22b391a3d 100644
--- a/src/core/tests/string_conv_test.cpp
+++ b/src/core/tests/string_conv_test.cpp
@@ -29,7 +29,7 @@
 
 TEST(string_conv, buf2bool)
 {
-    bool result;
+    bool result = false;
 
     ASSERT_TRUE(dsn::buf2bool("true", result));
     ASSERT_EQ(result, true);
@@ -60,7 +60,7 @@ TEST(string_conv, buf2bool)
 
 TEST(string_conv, buf2int32)
 {
-    int32_t result;
+    int32_t result = -1;
 
     ASSERT_TRUE(dsn::buf2int32(std::to_string(0), result));
     ASSERT_EQ(result, 0);
@@ -98,7 +98,7 @@ TEST(string_conv, buf2int32)
 
 TEST(string_conv, buf2int64)
 {
-    int64_t result;
+    int64_t result = -1;
 
     ASSERT_TRUE(dsn::buf2int64(std::to_string(0), result));
     ASSERT_EQ(result, 0);
@@ -143,7 +143,7 @@ TEST(string_conv, buf2int64)
 
 TEST(string_conv, buf2uint64)
 {
-    uint64_t result;
+    uint64_t result = 1;
 
     ASSERT_TRUE(dsn::buf2uint64(std::to_string(0), result));
     ASSERT_EQ(result, 0);
@@ -185,7 +185,7 @@ TEST(string_conv, buf2uint64)
 
 TEST(string_conv, int64_partial)
 {
-    int64_t result;
+    int64_t result = 0;
     ASSERT_FALSE(dsn::buf2int64("", result));
     ASSERT_FALSE(dsn::buf2int64(" ", result)) << result;
     ASSERT_FALSE(dsn::buf2int64("-", result)) << result;
@@ -201,7 +201,7 @@ TEST(string_conv, int64_partial)
 
 TEST(string_conv, uint64_partial)
 {
-    uint64_t result;
+    uint64_t result = 0;
     ASSERT_FALSE(dsn::buf2uint64("", result));
     ASSERT_FALSE(dsn::buf2uint64(" ", result)) << result;
     ASSERT_FALSE(dsn::buf2uint64("-", result)) << result;
@@ -216,7 +216,7 @@ TEST(string_conv, uint64_partial)
 
 TEST(string_conv, buf2double)
 {
-    double result;
+    double result = 0;
 
     ASSERT_TRUE(dsn::buf2double("1.1", result));
     ASSERT_DOUBLE_EQ(result, 1.1);
diff --git a/src/dist/replication/ddl_lib/replication_ddl_client.cpp b/src/dist/replication/ddl_lib/replication_ddl_client.cpp
index a4557deb78..db4387d672 100644
--- a/src/dist/replication/ddl_lib/replication_ddl_client.cpp
+++ b/src/dist/replication/ddl_lib/replication_ddl_client.cpp
@@ -602,6 +602,38 @@ dsn::error_code replication_ddl_client::list_nodes(const dsn::replication::node_
 #undef RESOLVE
 }
 
+dsn::error_code replication_ddl_client::cluster_name(int64_t timeout_ms, std::string &cluster_name)
+{
+    std::shared_ptr<configuration_cluster_info_request> req(
+        new configuration_cluster_info_request());
+
+    auto resp_task = request_meta<configuration_cluster_info_request>(RPC_CM_CLUSTER_INFO, req, timeout_ms);
+    resp_task->wait();
+    if (resp_task->error() != dsn::ERR_OK) {
+        return resp_task->error();
+    }
+
+    configuration_cluster_info_response resp;
+    ::dsn::unmarshall(resp_task->get_response(), resp);
+    if (resp.err != dsn::ERR_OK) {
+        return resp.err;
+    }
+
+    std::string zk_root;
+    for (int i = 0; i < resp.keys.size(); ++i) {
+        if (resp.keys[i] == "zookeeper_root") {
+            zk_root = resp.values[i];
+        }
+    }
+
+    cluster_name.clear();
+    if (!zk_root.empty() && zk_root.find("/pegasus/") == 0) {
+        cluster_name = zk_root.substr(9);
+    }
+
+    return cluster_name.empty() ? dsn::ERR_UNKNOWN : dsn::ERR_OK;
+}
+
 dsn::error_code replication_ddl_client::cluster_info(const std::string &file_name, bool resolve_ip)
 {
     std::shared_ptr<configuration_cluster_info_request> req(