多线程跑批处理大数据代码总结

小咪咪 2022-11-01 13:42 121阅读 0赞

### **多线程跑批处理大数据**  ###

**具体思路：是先把大量数据（100w）按照1000切分成多份，然后把1000个数据排序放在10个线程中，进行多线程处理。**

public void handle() throws BusinessException {
    
    		int pageSize = 1000;
    		
    		// 目前处理逻辑中，存在多线程并发，故保险起见线程数设置不要超过10
    		int threadNum = 10;
    
    		Page<PDto> page = new Page<PDto>(pageSize);
    		
    		int total = 0;
    
    		// 循环分页查询数据进行处理
    		for (;;) {
    
    			pMapper.selectP(page, new HashMap<String, Object>());// 满足数据集合
    
    			if (null == page || null == page.getResult() || page.getResult().isEmpty()) {
    				LOG.info("未查询到数据,跑批结束#");
    				break;
    			}
    
    			ThreadPoolExecutor executor = (ThreadPoolExecutor) Executors.newFixedThreadPool(threadNum);
    			
    			total += page.getResult().size();
    
    			// 将数据进行排序，防止并发问题
    			Map<Long, List<PDto>> aMap = new HashMap<Long, List<PDto>>();
    
    			List<PDto> pPageList = page.getResult();
    
    			for (PDto pDto : pPageList) {
    				if (aMap.get(pDto.getMid()) == null) {
    					aMap.put(pDto.getMid(), new ArrayList<PDto>());
    				}
    
    				aMap.get(pDto.getMid()).add(pDto);
    			}
    
    			// 将需要执行的数据分配到各个线程中去
    			Map<String, List<PDto>> threadWorkMap = new HashMap<String, List<PDto>>();
    			int j = 1;
    
    			for (List<PDto> list : aMap.values()) {
    				if (threadWorkMap.get("thread_" + j) == null) {
    					threadWorkMap.put("thread_" + j, new ArrayList<PDto>());
    				}
    				threadWorkMap.get("thread_" + j).addAll(list);
    				if (++j > threadNum) {
    					j = 1;
    				}
    			}
    
    			// 启动每个线程处理任务
    			for (int m = 1; m <= threadNum; m++) {
    				List<PDto> threadWorkList = threadWorkMap.get("thread_" + m);
    
    				if (threadWorkList == null || threadWorkList.size() == 0) {
    					continue;
    				}
    
    				Runnable task = bThread(threadWorkList);
    				executor.submit(task);
    			}
    
    			try {
    				executor.shutdown();
    				executor.awaitTermination(1, TimeUnit.HOURS);
    			} catch (InterruptedException e) {
    				LOG.error("当前线程被中断#", e);
    			}
    
    			// 返回数据小于最小分页数，说明已经处理完毕
    			if (page.getResult().size() < pageSize) {
    				LOG.info("結束......");
    				break;
    			}
    		}
    
    		LOG.info("总数:{}笔", total);
    
    	}

**数据业务逻辑处理**

private Runnable bPayThread(final List<PDto> pList) {
    		Runnable run = new Runnable() {
    			@Override
    			public void run() {
    				long startTime = System.currentTimeMillis();
    				// 分别处理每一个数据
    				for (PDto pDto : pList) {
    					try {
                            // 主业务逻辑处理
    						muService.pRdTx(pDto);
    					} catch (Exception e) {
    						// 如果处理失败，则记录失败日志，并标记
    					
    					}
    				}
    				long endTime = System.currentTimeMillis();
    				float seconds = (endTime - startTime) / 1000F;
    				LOG.info("线程ID:{},还款笔数:{},执行时间:{}秒", Thread.currentThread().getId(), pList.size(), seconds);
    			}
    		};
    		return run;
    	}