[GitHub] [skywalking] zxbu edited a comment on issue #2521: skywalking will stop collect unexpectedly when hundreds os service

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zxbu edited a comment on issue #2521: skywalking will stop collect unexpectedly when hundreds os service 
URL: https://github.com/apache/skywalking/issues/2521#issuecomment-486585987
 
 
   ![image](https://user-images.githubusercontent.com/32785355/56724030-c3cb5880-677c-11e9-8d2c-4f01f887e148.png)
   
   the grpc-default-executor thread state all was TIMED_WAITING. 
   Is it a endless loop sometimes? @wu-sheng 
   
   ```java
   /*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.skywalking.apm.commons.datacarrier.buffer;
   
   import java.util.LinkedList;
   import java.util.List;
   import org.apache.skywalking.apm.commons.datacarrier.callback.QueueBlockingCallback;
   import org.apache.skywalking.apm.commons.datacarrier.common.AtomicRangeInteger;
   
   /**
    * Created by wusheng on 2016/10/25.
    */
   public class Buffer<T> {
       private final Object[] buffer;
       private BufferStrategy strategy;
       private AtomicRangeInteger index;
       private List<QueueBlockingCallback<T>> callbacks;
   
       Buffer(int bufferSize, BufferStrategy strategy) {
           buffer = new Object[bufferSize];
           this.strategy = strategy;
           index = new AtomicRangeInteger(0, bufferSize);
           callbacks = new LinkedList<QueueBlockingCallback<T>>();
       }
   
       void setStrategy(BufferStrategy strategy) {
           this.strategy = strategy;
       }
   
       void addCallback(QueueBlockingCallback<T> callback) {
           callbacks.add(callback);
       }
   
       boolean save(T data) {
           int i = index.getAndIncrement();
           if (buffer[i] != null) {
               switch (strategy) {
                   case BLOCKING:
                       boolean isFirstTimeBlocking = true;
                       while (buffer[i] != null) {
                           if (isFirstTimeBlocking) {
                               isFirstTimeBlocking = false;
                               for (QueueBlockingCallback<T> callback : callbacks) {
                                   callback.notify(data);
                               }
                           }
                           try {
                               Thread.sleep(1L);
                           } catch (InterruptedException e) {
                           }
                       }
                       break;
                   case IF_POSSIBLE:
                       return false;
                   case OVERRIDE:
                   default:
               }
           }
           buffer[i] = data;
           return true;
       }
   
       public int getBufferSize() {
           return buffer.length;
       }
   
       public LinkedList<T> obtain(int start, int end) {
           LinkedList<T> result = new LinkedList<T>();
           for (int i = start; i < end; i++) {
               if (buffer[i] != null) {
                   result.add((T)buffer[i]);
                   buffer[i] = null;
               }
           }
           return result;
       }
   
   }
   
   ```
   
   

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