diff --git a/pom.xml b/pom.xml
index 4b2a661b9..a116bf55e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.actiontech</groupId>
     <artifactId>dble</artifactId>
-    <version>2.18.02.0</version>
+    <version>2.18.02.1-dev</version>
     <packaging>jar</packaging>
     <name>dble-server</name>
     <description>The project of dble-server</description>
diff --git a/src/main/java/com/actiontech/dble/config/ConfigInitializer.java b/src/main/java/com/actiontech/dble/config/ConfigInitializer.java
index 749b0d3a9..7f4be35d0 100644
--- a/src/main/java/com/actiontech/dble/config/ConfigInitializer.java
+++ b/src/main/java/com/actiontech/dble/config/ConfigInitializer.java
@@ -15,6 +15,7 @@ import com.actiontech.dble.config.loader.xml.XMLSchemaLoader;
 import com.actiontech.dble.config.loader.xml.XMLServerLoader;
 import com.actiontech.dble.config.model.*;
 import com.actiontech.dble.config.util.ConfigException;
+import com.actiontech.dble.log.alarm.AlarmCode;
 import com.actiontech.dble.route.sequence.handler.DistributedSequenceHandler;
 import com.actiontech.dble.route.sequence.handler.IncrSequenceMySQLHandler;
 import com.actiontech.dble.route.sequence.handler.IncrSequenceTimeHandler;
@@ -171,9 +172,7 @@ public class ConfigInitializer {
         for (SchemaConfig sc : schemas.values()) {
             // check dataNode / dataHost
             Set<String> dataNodeNames = sc.getAllDataNodes();
-            for (String dataNodeName : dataNodeNames) {
-                allUseDataNode.add(dataNodeName);
-            }
+            allUseDataNode.addAll(dataNodeNames);
         }
 
         // add global sequence node when it is some dedicated servers */
@@ -235,24 +234,33 @@ public class ConfigInitializer {
                             boolean isConnected = ds.testConnection(database);
                             map.put(key, isConnected);
                         } catch (IOException e) {
-                            LOGGER.info("test conn " + key + " error:", e);
+                            LOGGER.warn(AlarmCode.CORE_GENERAL_WARN + "test conn " + key + " error:", e);
                         }
                     }
                 }
             }
             boolean isConnectivity = true;
+            List<String> errKeys = new ArrayList<>();
             for (Map.Entry<String, Boolean> entry : map.entrySet()) {
                 String key = entry.getKey();
                 Boolean value = entry.getValue();
                 if (!value && isConnectivity) {
-                    LOGGER.info("SelfCheck### test " + key + " database connection failed ");
+                    LOGGER.warn(AlarmCode.CORE_GENERAL_WARN + "SelfCheck### test " + key + " database connection failed ");
+                    errKeys.add(key);
                     isConnectivity = false;
                 } else {
                     LOGGER.info("SelfCheck### test " + key + " database connection success ");
                 }
             }
             if (!isConnectivity) {
-                throw new ConfigException("SelfCheck### there are some datasource connection failed, pls check!");
+                StringBuilder sb = new StringBuilder("SelfCheck### there are some datasource connection failed, pls check these datasource:");
+                for (String key : errKeys) {
+                    sb.append("[");
+                    sb.append(key);
+                    sb.append("].");
+                }
+
+                throw new ConfigException(sb.toString());
             }
         }
     }
diff --git a/src/main/java/com/actiontech/dble/manager/response/ReloadConfig.java b/src/main/java/com/actiontech/dble/manager/response/ReloadConfig.java
index 795aafacf..1ce106b5b 100644
--- a/src/main/java/com/actiontech/dble/manager/response/ReloadConfig.java
+++ b/src/main/java/com/actiontech/dble/manager/response/ReloadConfig.java
@@ -7,23 +7,20 @@ package com.actiontech.dble.manager.response;
 
 import com.actiontech.dble.DbleServer;
 import com.actiontech.dble.backend.BackendConnection;
-import com.actiontech.dble.cluster.ClusterParamCfg;
-import com.actiontech.dble.config.loader.ucoreprocess.*;
-import com.actiontech.dble.config.loader.ucoreprocess.loader.UConfigStatusResponse;
-import com.actiontech.dble.config.loader.zkprocess.zookeeper.process.ConfStatus;
-import com.actiontech.dble.net.FrontendConnection;
-import com.actiontech.dble.server.ServerConnection;
-import com.actiontech.dble.route.RouteResultsetNode;
 import com.actiontech.dble.backend.datasource.PhysicalDBNode;
 import com.actiontech.dble.backend.datasource.PhysicalDBPool;
 import com.actiontech.dble.backend.datasource.PhysicalDatasource;
 import com.actiontech.dble.backend.mysql.nio.MySQLConnection;
+import com.actiontech.dble.cluster.ClusterParamCfg;
 import com.actiontech.dble.config.ConfigInitializer;
 import com.actiontech.dble.config.ErrorCode;
 import com.actiontech.dble.config.ServerConfig;
+import com.actiontech.dble.config.loader.ucoreprocess.*;
+import com.actiontech.dble.config.loader.ucoreprocess.loader.UConfigStatusResponse;
 import com.actiontech.dble.config.loader.zkprocess.comm.ZkConfig;
 import com.actiontech.dble.config.loader.zkprocess.xmltozk.XmltoZkMain;
 import com.actiontech.dble.config.loader.zkprocess.zktoxml.listen.ConfigStatusListener;
+import com.actiontech.dble.config.loader.zkprocess.zookeeper.process.ConfStatus;
 import com.actiontech.dble.config.model.ERTable;
 import com.actiontech.dble.config.model.FirewallConfig;
 import com.actiontech.dble.config.model.SchemaConfig;
@@ -31,13 +28,16 @@ import com.actiontech.dble.config.model.UserConfig;
 import com.actiontech.dble.config.util.DnPropertyUtil;
 import com.actiontech.dble.log.AlarmAppender;
 import com.actiontech.dble.manager.ManagerConnection;
+import com.actiontech.dble.net.FrontendConnection;
 import com.actiontech.dble.net.NIOProcessor;
 import com.actiontech.dble.net.mysql.OkPacket;
+import com.actiontech.dble.route.RouteResultsetNode;
+import com.actiontech.dble.route.parser.ManagerParseConfig;
+import com.actiontech.dble.server.ServerConnection;
 import com.actiontech.dble.server.variables.SystemVariables;
 import com.actiontech.dble.server.variables.VarsExtractorHandler;
 import com.actiontech.dble.util.KVPathUtil;
 import com.actiontech.dble.util.ZKUtils;
-import com.actiontech.dble.route.parser.ManagerParseConfig;
 import org.apache.curator.framework.CuratorFramework;
 import org.apache.curator.framework.recipes.locks.InterProcessMutex;
 import org.apache.curator.utils.ZKPaths;
@@ -307,7 +307,7 @@ public final class ReloadConfig {
 
         /* 2.1 do nothing */
         boolean isReloadStatusOK = true;
-
+        String reasonMsg = null;
         /* 2.2 init the new dataSource */
         for (PhysicalDBPool dbPool : newDataHosts.values()) {
             String hostName = dbPool.getHostName();
@@ -329,6 +329,7 @@ public final class ReloadConfig {
             dbPool.init(Integer.parseInt(dnIndex));
             if (!dbPool.isInitSuccess()) {
                 isReloadStatusOK = false;
+                reasonMsg = "Init DbPool [" + dbPool.getHostName() + "] failed";
                 break;
             }
         }
@@ -347,7 +348,7 @@ public final class ReloadConfig {
                 dbPool.clearDataSources("reload config");
                 dbPool.stopHeartbeat();
             }
-            throw new Exception("Init DbPool failed");
+            throw new Exception(reasonMsg);
         }
     }
 
diff --git a/src/main/java/com/actiontech/dble/server/variables/MysqlVarsListener.java b/src/main/java/com/actiontech/dble/server/variables/MysqlVarsListener.java
index 9bc46ba4e..83d589f3a 100644
--- a/src/main/java/com/actiontech/dble/server/variables/MysqlVarsListener.java
+++ b/src/main/java/com/actiontech/dble/server/variables/MysqlVarsListener.java
@@ -26,6 +26,7 @@ public class MysqlVarsListener implements SQLQueryResultListener<SQLQueryResult<
         if (!result.isSuccess()) {
             //not thread safe
             LOGGER.warn(AlarmCode.CORE_GENERAL_WARN + "Can't get variables from DataNode: " + result.getDataNode() + "!");
+            handler.signalDone();
             return;
         }
 
diff --git a/src/main/java/com/actiontech/dble/server/variables/VarsExtractorHandler.java b/src/main/java/com/actiontech/dble/server/variables/VarsExtractorHandler.java
index 223474379..3c3eb8188 100644
--- a/src/main/java/com/actiontech/dble/server/variables/VarsExtractorHandler.java
+++ b/src/main/java/com/actiontech/dble/server/variables/VarsExtractorHandler.java
@@ -56,7 +56,7 @@ public class VarsExtractorHandler {
     }
 
 
-    private void signalDone() {
+    public void signalDone() {
         lock.lock();
         try {
             extracting = true;