diff --git a/src/main/java/com/alibaba/druid/pool/ha/MultiDataSource.java b/src/main/java/com/alibaba/druid/pool/ha/MultiDataSource.java
index c7b4a2c72f..18b9c74ece 100644
--- a/src/main/java/com/alibaba/druid/pool/ha/MultiDataSource.java
+++ b/src/main/java/com/alibaba/druid/pool/ha/MultiDataSource.java
@@ -232,12 +232,12 @@ public abstract class MultiDataSource extends DataSourceAdapter implements Multi
         return scheduler;
     }
 
-    public long getValidDataSourceCheckPeriodMillis() {
-        return failureDetectPeriodMillis;
+    public void setFailureDetectPeriodMillis(long failureDetectPeriodMillis) {
+        this.failureDetectPeriodMillis = failureDetectPeriodMillis;
     }
 
-    public void setValidDataSourceCheckPeriodMillis(long validDataSourceCheckPeriodMillis) {
-        this.failureDetectPeriodMillis = validDataSourceCheckPeriodMillis;
+    public void setConfigLoadPeriodMillis(long configLoadPeriodMillis) {
+        this.configLoadPeriodMillis = configLoadPeriodMillis;
     }
 
     public DataSourceFailureDetecter getFailureDetector() {
diff --git a/src/main/java/com/alibaba/druid/pool/ha/cobar/CobarDataSource.java b/src/main/java/com/alibaba/druid/pool/ha/cobar/CobarDataSource.java
index b13dfae2d5..1c0dd0d846 100644
--- a/src/main/java/com/alibaba/druid/pool/ha/cobar/CobarDataSource.java
+++ b/src/main/java/com/alibaba/druid/pool/ha/cobar/CobarDataSource.java
@@ -14,7 +14,12 @@ import com.alibaba.druid.util.JdbcUtils;
 
 public class CobarDataSource extends MultiDataSource {
 
-    private final static Log LOG          = LogFactory.getLog(CobarDataSource.class);
+    private final static Log LOG                                   = LogFactory.getLog(CobarDataSource.class);
+
+    public static long       DEFAULT_FAILURE_DETECT_PERRIOD_MILLIS = 1000 * 3;                                // 3
+                                                                                                               // seconds
+    public static long       DEFAULT_CONFIG_LOAD_PERRIOD_MILLIS    = 1000 * 60 * 3;                           // 3
+                                                                                                               // minutes
 
     private String           url;
 
@@ -22,11 +27,27 @@ public class CobarDataSource extends MultiDataSource {
 
     private String           password;
 
-    private List<Filter>     proxyFilters = new ArrayList<Filter>();
+    private List<Filter>     proxyFilters                          = new ArrayList<Filter>();
     private String           filters;
 
+    private int              maxPoolSize;
+
     public CobarDataSource(){
         this.setFailureDetector(new CobarFailureDetecter());
+        this.setFailureDetectPeriodMillis(DEFAULT_FAILURE_DETECT_PERRIOD_MILLIS);
+        this.setConfigLoadPeriodMillis(DEFAULT_CONFIG_LOAD_PERRIOD_MILLIS);
+    }
+
+    public int getMaxPoolSize() {
+        return maxPoolSize;
+    }
+
+    public void setMaxPoolSize(int maxPoolSize) throws SQLException {
+        if (this.isIntited()) {
+            throw new SQLException("dataSource inited");
+        }
+
+        this.maxPoolSize = maxPoolSize;
     }
 
     public String getUrl() {
@@ -84,7 +105,7 @@ public class CobarDataSource extends MultiDataSource {
                     break;
                 } catch (Exception ex) {
                     LOG.error("load config error", ex);
-                    
+
                     try {
                         Thread.sleep(1000);
                     } catch (InterruptedException e) {