Question

使用多个客户端执行并发更新时出现以下错误。在Apache Jmeter中创建了多个客户端线程。

2016/11/03 15:00:57错误 - jmeter.threads.JMeterThread：处理采样器'Java Request'时出错：java.lang.NullPointerException at ignite_client_jmeter.new_order（ignite_client_jmeter.java:857） at ignite_client_jmeter.runTest（ignite_client_jmeter.java:1659）在org.apache.jmeter.protocol.java.sampler.JavaSampler.sample（JavaSampler.java:196）在org.apache.jmeter.threads.JMeterThread.executeSamplePackage（JMeterThread.java:465）在org.apache.jmeter.threads.JMeterThread.processSampler（JMeterThread.java:410）在org.apache.jmeter.threads.JMeterThread.run（JMeterThread.java:241）在java.lang.Thread.run（Thread.java:745）

以下是访问使用缓存get（）操作检索的数据时在第857行发生错误的部分。代码适用于单个客户端。但是对于超过1个客户端，它会抛出上面提到的NullPointerException错误。

更新查询

      //UPDATE district SET d_next_o_id = ? + 1 WHERE d_id = ? AND d_w_id = ?

      districtKey dkey = new districtKey(district_num, warehouse_num);
      System.out.println("Thread_ id = "+thread_num+", district_num = "+district_num+", warehouse_num = "+warehouse_num);

      IgniteTransactions transactions = ignite.transactions();
      try (Transaction tx = ignite.transactions().txStart(TransactionConcurrency.PESSIMISTIC,
                TransactionIsolation.SERIALIZABLE)) {
          district dist = (district) cache_district.get(dkey);

          assert dist != null;

          if(dist == null)
              System.out.println("......Thread_ id = "+thread_num+", district_num = "+district_num+", warehouse_num = "+warehouse_num);


          dist.d_next_o_id = d_next_o_id + 1;  //Line number 857
          d_next_o_id = d_next_o_id + 1;

          cache_district.put(dkey, dist);
          tx.commit();
      }
      catch (CacheException e) {
            if (e.getCause() instanceof TransactionTimeoutException &&
                e.getCause().getCause() instanceof TransactionDeadlockException)    

                System.out.println(e.getCause().getCause().getMessage());
        }         

      Integer o_id; 
      o_id = d_next_o_id;

在Apache Ignite中执行多个客户端并发更新时出现NullPointerException

0 个答案: