solve too many files, close logClientService (#3971)

dolphinscheduler-service/src/main/java/org/apache/dolphinscheduler/service/process/ProcessService.java

@@ -307,8 +307,10 @@ public class ProcessService {
      */
     public void removeTaskLogFile(Integer processInstanceId){
 
-        LogClientService logClient = new LogClientService();
+        LogClientService logClient = null;
 
+        try {
+            logClient = new LogClientService();
             List<TaskInstance> taskInstanceList = findValidTaskListByProcessId(processInstanceId);
 
             if (CollectionUtils.isEmpty(taskInstanceList)) {
@@ -329,10 +331,14 @@ public class ProcessService {
                     ip = taskInstance.getHost();
                 }
 
-
                 // remove task log from loggerserver
                 logClient.removeTaskLog(ip, port, taskLogPath);
             }
+        }finally {
+            if (logClient != null) {
+                logClient.close();
+            }
+        }
     }