bug fixed

src/main/java/com/alibaba/druid/pool/DruidDataSource.java

@@ -799,7 +799,12 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
     public void discardConnection(Connection realConnection) {
         JdbcUtils.close(realConnection);
 
-        lock.lock();
+        try {
+            lock.lockInterruptibly();
+        } catch (InterruptedException e) {
+            LOG.error("interrupt");
+            return;
+        }
         try {
             activeCount--;
             discardCount++;

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlPartitioningClause.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.alibaba.druid.sql.dialect.mysql.ast.statement;
 
 import java.util.ArrayList;

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlPartitioningDef.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.alibaba.druid.sql.dialect.mysql.ast.statement;
 
 import java.util.ArrayList;